<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 1.5.7">
<meta name="author" content="Khronos&#174; OpenCL Working Group">
<title>OpenCL&#8482; ICD Installation Guidelines</title>
<style>
/*! normalize.css v2.1.2 | MIT License | git.io/normalize */
/* ========================================================================== HTML5 display definitions ========================================================================== */
/** Correct `block` display not defined in IE 8/9. */
article, aside, details, figcaption, figure, footer, header, hgroup, main, nav, section, summary { display: block; }

/** Correct `inline-block` display not defined in IE 8/9. */
audio, canvas, video { display: inline-block; }

/** Prevent modern browsers from displaying `audio` without controls. Remove excess height in iOS 5 devices. */
audio:not([controls]) { display: none; height: 0; }

/** Address `[hidden]` styling not present in IE 8/9. Hide the `template` element in IE, Safari, and Firefox < 22. */
[hidden], template { display: none; }

script { display: none !important; }

/* ========================================================================== Base ========================================================================== */
/** 1. Set default font family to sans-serif. 2. Prevent iOS text size adjust after orientation change, without disabling user zoom. */
html { font-family: sans-serif; /* 1 */ -ms-text-size-adjust: 100%; /* 2 */ -webkit-text-size-adjust: 100%; /* 2 */ }

/** Remove default margin. */
body { margin: 0; }

/* ========================================================================== Links ========================================================================== */
/** Remove the gray background color from active links in IE 10. */
a { background: transparent; }

/** Address `outline` inconsistency between Chrome and other browsers. */
a:focus { outline: thin dotted; }

/** Improve readability when focused and also mouse hovered in all browsers. */
a:active, a:hover { outline: 0; }

/* ========================================================================== Typography ========================================================================== */
/** Address variable `h1` font-size and margin within `section` and `article` contexts in Firefox 4+, Safari 5, and Chrome. */
h1 { font-size: 2em; margin: 0.67em 0; }

/** Address styling not present in IE 8/9, Safari 5, and Chrome. */
abbr[title] { border-bottom: 1px dotted; }

/** Address style set to `bolder` in Firefox 4+, Safari 5, and Chrome. */
b, strong { font-weight: bold; }

/** Address styling not present in Safari 5 and Chrome. */
dfn { font-style: italic; }

/** Address differences between Firefox and other browsers. */
hr { -moz-box-sizing: content-box; box-sizing: content-box; height: 0; }

/** Address styling not present in IE 8/9. */
mark { background: #ff0; color: #000; }

/** Correct font family set oddly in Safari 5 and Chrome. */
code, kbd, pre, samp { font-family: monospace, serif; font-size: 1em; }

/** Improve readability of pre-formatted text in all browsers. */
pre { white-space: pre-wrap; }

/** Set consistent quote types. */
q { quotes: "\201C" "\201D" "\2018" "\2019"; }

/** Address inconsistent and variable font size in all browsers. */
small { font-size: 80%; }

/** Prevent `sub` and `sup` affecting `line-height` in all browsers. */
sub, sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline; }

sup { top: -0.5em; }

sub { bottom: -0.25em; }

/* ========================================================================== Embedded content ========================================================================== */
/** Remove border when inside `a` element in IE 8/9. */
img { border: 0; }

/** Correct overflow displayed oddly in IE 9. */
svg:not(:root) { overflow: hidden; }

/* ========================================================================== Figures ========================================================================== */
/** Address margin not present in IE 8/9 and Safari 5. */
figure { margin: 0; }

/* ========================================================================== Forms ========================================================================== */
/** Define consistent border, margin, and padding. */
fieldset { border: 1px solid #c0c0c0; margin: 0 2px; padding: 0.35em 0.625em 0.75em; }

/** 1. Correct `color` not being inherited in IE 8/9. 2. Remove padding so people aren't caught out if they zero out fieldsets. */
legend { border: 0; /* 1 */ padding: 0; /* 2 */ }

/** 1. Correct font family not being inherited in all browsers. 2. Correct font size not being inherited in all browsers. 3. Address margins set differently in Firefox 4+, Safari 5, and Chrome. */
button, input, select, textarea { font-family: inherit; /* 1 */ font-size: 100%; /* 2 */ margin: 0; /* 3 */ }

/** Address Firefox 4+ setting `line-height` on `input` using `!important` in the UA stylesheet. */
button, input { line-height: normal; }

/** Address inconsistent `text-transform` inheritance for `button` and `select`. All other form control elements do not inherit `text-transform` values. Correct `button` style inheritance in Chrome, Safari 5+, and IE 8+. Correct `select` style inheritance in Firefox 4+ and Opera. */
button, select { text-transform: none; }

/** 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio` and `video` controls. 2. Correct inability to style clickable `input` types in iOS. 3. Improve usability and consistency of cursor style between image-type `input` and others. */
button, html input[type="button"], input[type="reset"], input[type="submit"] { -webkit-appearance: button; /* 2 */ cursor: pointer; /* 3 */ }

/** Re-set default cursor for disabled elements. */
button[disabled], html input[disabled] { cursor: default; }

/** 1. Address box sizing set to `content-box` in IE 8/9. 2. Remove excess padding in IE 8/9. */
input[type="checkbox"], input[type="radio"] { box-sizing: border-box; /* 1 */ padding: 0; /* 2 */ }

/** 1. Address `appearance` set to `searchfield` in Safari 5 and Chrome. 2. Address `box-sizing` set to `border-box` in Safari 5 and Chrome (include `-moz` to future-proof). */
input[type="search"] { -webkit-appearance: textfield; /* 1 */ -moz-box-sizing: content-box; -webkit-box-sizing: content-box; /* 2 */ box-sizing: content-box; }

/** Remove inner padding and search cancel button in Safari 5 and Chrome on OS X. */
input[type="search"]::-webkit-search-cancel-button, input[type="search"]::-webkit-search-decoration { -webkit-appearance: none; }

/** Remove inner padding and border in Firefox 4+. */
button::-moz-focus-inner, input::-moz-focus-inner { border: 0; padding: 0; }

/** 1. Remove default vertical scrollbar in IE 8/9. 2. Improve readability and alignment in all browsers. */
textarea { overflow: auto; /* 1 */ vertical-align: top; /* 2 */ }

/* ========================================================================== Tables ========================================================================== */
/** Remove most spacing between table cells. */
table { border-collapse: collapse; border-spacing: 0; }

meta.foundation-mq-small { font-family: "only screen and (min-width: 768px)"; width: 768px; }

meta.foundation-mq-medium { font-family: "only screen and (min-width:1280px)"; width: 1280px; }

meta.foundation-mq-large { font-family: "only screen and (min-width:1440px)"; width: 1440px; }

*, *:before, *:after { -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; }

html, body { font-size: 100%; }

body { background: white; color: #222222; padding: 0; margin: 0; font-family: "Helvetica Neue", "Helvetica", Helvetica, Arial, sans-serif; font-weight: normal; font-style: normal; line-height: 1; position: relative; cursor: auto; }

a:hover { cursor: pointer; }

img, object, embed { max-width: 100%; height: auto; }

object, embed { height: 100%; }

img { -ms-interpolation-mode: bicubic; }

#map_canvas img, #map_canvas embed, #map_canvas object, .map_canvas img, .map_canvas embed, .map_canvas object { max-width: none !important; }

.left { float: left !important; }

.right { float: right !important; }

.text-left { text-align: left !important; }

.text-right { text-align: right !important; }

.text-center { text-align: center !important; }

.text-justify { text-align: justify !important; }

.hide { display: none; }

.antialiased { -webkit-font-smoothing: antialiased; }

img { display: inline-block; vertical-align: middle; }

textarea { height: auto; min-height: 50px; }

select { width: 100%; }

object, svg { display: inline-block; vertical-align: middle; }

.center { margin-left: auto; margin-right: auto; }

.spread { width: 100%; }

p.lead, .paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { font-size: 1.21875em; line-height: 1.6; }

.subheader, .admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { line-height: 1.4; color: black; font-weight: 300; margin-top: 0.2em; margin-bottom: 0.5em; }

/* Typography resets */
div, dl, dt, dd, ul, ol, li, h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6, pre, form, p, blockquote, th, td { margin: 0; padding: 0; direction: ltr; }

/* Default Link Styles */
a { color: #0068b0; text-decoration: none; line-height: inherit; }
a:hover, a:focus { color: #333333; }
a img { border: none; }

/* Default paragraph styles */
p { font-family: Noto, sans-serif; font-weight: normal; font-size: 1em; line-height: 1.6; margin-bottom: 0.75em; text-rendering: optimizeLegibility; }
p aside { font-size: 0.875em; line-height: 1.35; font-style: italic; }

/* Default header styles */
h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { font-family: Noto, sans-serif; font-weight: normal; font-style: normal; color: black; text-rendering: optimizeLegibility; margin-top: 0.5em; margin-bottom: 0.5em; line-height: 1.2125em; }
h1 small, h2 small, h3 small, #toctitle small, .sidebarblock > .content > .title small, h4 small, h5 small, h6 small { font-size: 60%; color: #4d4d4d; line-height: 0; }

h1 { font-size: 2.125em; }

h2 { font-size: 1.6875em; }

h3, #toctitle, .sidebarblock > .content > .title { font-size: 1.375em; }

h4 { font-size: 1.125em; }

h5 { font-size: 1.125em; }

h6 { font-size: 1em; }

hr { border: solid #dddddd; border-width: 1px 0 0; clear: both; margin: 1.25em 0 1.1875em; height: 0; }

/* Helpful Typography Defaults */
em, i { font-style: italic; line-height: inherit; }

strong, b { font-weight: bold; line-height: inherit; }

small { font-size: 60%; line-height: inherit; }

code { font-family: Consolas, "Liberation Mono", Courier, monospace; font-weight: normal; color: #264357; }

/* Lists */
ul, ol, dl { font-size: 1em; line-height: 1.6; margin-bottom: 0.75em; list-style-position: outside; font-family: Noto, sans-serif; }

ul, ol { margin-left: 1.5em; }
ul.no-bullet, ol.no-bullet { margin-left: 1.5em; }

/* Unordered Lists */
ul li ul, ul li ol { margin-left: 1.25em; margin-bottom: 0; font-size: 1em; /* Override nested font-size change */ }
ul.square li ul, ul.circle li ul, ul.disc li ul { list-style: inherit; }
ul.square { list-style-type: square; }
ul.circle { list-style-type: circle; }
ul.disc { list-style-type: disc; }
ul.no-bullet { list-style: none; }

/* Ordered Lists */
ol li ul, ol li ol { margin-left: 1.25em; margin-bottom: 0; }

/* Definition Lists */
dl dt { margin-bottom: 0.3em; font-weight: bold; }
dl dd { margin-bottom: 0.75em; }

/* Abbreviations */
abbr, acronym { text-transform: uppercase; font-size: 90%; color: black; border-bottom: 1px dotted #dddddd; cursor: help; }

abbr { text-transform: none; }

/* Blockquotes */
blockquote { margin: 0 0 0.75em; padding: 0.5625em 1.25em 0 1.1875em; border-left: 1px solid #dddddd; }
blockquote cite { display: block; font-size: 0.8125em; color: #5e93b8; }
blockquote cite:before { content: "\2014 \0020"; }
blockquote cite a, blockquote cite a:visited { color: #5e93b8; }

blockquote, blockquote p { line-height: 1.6; color: #333333; }

/* Microformats */
.vcard { display: inline-block; margin: 0 0 1.25em 0; border: 1px solid #dddddd; padding: 0.625em 0.75em; }
.vcard li { margin: 0; display: block; }
.vcard .fn { font-weight: bold; font-size: 0.9375em; }

.vevent .summary { font-weight: bold; }
.vevent abbr { cursor: auto; text-decoration: none; font-weight: bold; border: none; padding: 0 0.0625em; }

@media only screen and (min-width: 768px) { h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { line-height: 1.4; }
  h1 { font-size: 2.75em; }
  h2 { font-size: 2.3125em; }
  h3, #toctitle, .sidebarblock > .content > .title { font-size: 1.6875em; }
  h4 { font-size: 1.4375em; } }
/* Tables */
table { background: white; margin-bottom: 1.25em; border: solid 1px #d8d8ce; }
table thead, table tfoot { background: -webkit-linear-gradient(top, #add386, #90b66a); font-weight: bold; }
table thead tr th, table thead tr td, table tfoot tr th, table tfoot tr td { padding: 0.5em 0.625em 0.625em; font-size: inherit; color: white; text-align: left; }
table tr th, table tr td { padding: 0.5625em 0.625em; font-size: inherit; color: #6d6e71; }
table tr.even, table tr.alt, table tr:nth-of-type(even) { background: #edf2f2; }
table thead tr th, table tfoot tr th, table tbody tr td, table tr td, table tfoot tr td { display: table-cell; line-height: 1.4; }

body { -moz-osx-font-smoothing: grayscale; -webkit-font-smoothing: antialiased; tab-size: 4; }

h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { line-height: 1.4; }

a:hover, a:focus { text-decoration: underline; }

.clearfix:before, .clearfix:after, .float-group:before, .float-group:after { content: " "; display: table; }
.clearfix:after, .float-group:after { clear: both; }

*:not(pre) > code { font-size: inherit; font-style: normal !important; letter-spacing: 0; padding: 0; background-color: white; -webkit-border-radius: 0; border-radius: 0; line-height: inherit; word-wrap: break-word; }
*:not(pre) > code.nobreak { word-wrap: normal; }
*:not(pre) > code.nowrap { white-space: nowrap; }

pre, pre > code { line-height: 1.6; color: #264357; font-family: Consolas, "Liberation Mono", Courier, monospace; font-weight: normal; }

em em { font-style: normal; }

strong strong { font-weight: normal; }

.keyseq { color: #333333; }

kbd { font-family: Consolas, "Liberation Mono", Courier, monospace; display: inline-block; color: black; font-size: 0.65em; line-height: 1.45; background-color: #f7f7f7; border: 1px solid #ccc; -webkit-border-radius: 3px; border-radius: 3px; -webkit-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; margin: 0 0.15em; padding: 0.2em 0.5em; vertical-align: middle; position: relative; top: -0.1em; white-space: nowrap; }

.keyseq kbd:first-child { margin-left: 0; }

.keyseq kbd:last-child { margin-right: 0; }

.menuseq, .menuref { color: #000; }

.menuseq b:not(.caret), .menuref { font-weight: inherit; }

.menuseq { word-spacing: -0.02em; }
.menuseq b.caret { font-size: 1.25em; line-height: 0.8; }
.menuseq i.caret { font-weight: bold; text-align: center; width: 0.45em; }

b.button:before, b.button:after { position: relative; top: -1px; font-weight: normal; }

b.button:before { content: "["; padding: 0 3px 0 2px; }

b.button:after { content: "]"; padding: 0 2px 0 3px; }

#header, #content, #footnotes, #footer { width: 100%; margin-left: auto; margin-right: auto; margin-top: 0; margin-bottom: 0; max-width: 62.5em; *zoom: 1; position: relative; padding-left: 1.5em; padding-right: 1.5em; }
#header:before, #header:after, #content:before, #content:after, #footnotes:before, #footnotes:after, #footer:before, #footer:after { content: " "; display: table; }
#header:after, #content:after, #footnotes:after, #footer:after { clear: both; }

#content { margin-top: 1.25em; }

#content:before { content: none; }

#header > h1:first-child { color: black; margin-top: 2.25rem; margin-bottom: 0; }
#header > h1:first-child + #toc { margin-top: 8px; border-top: 1px solid #dddddd; }
#header > h1:only-child, body.toc2 #header > h1:nth-last-child(2) { border-bottom: 1px solid #dddddd; padding-bottom: 8px; }
#header .details { border-bottom: 1px solid #dddddd; line-height: 1.45; padding-top: 0.25em; padding-bottom: 0.25em; padding-left: 0.25em; color: #5e93b8; display: -ms-flexbox; display: -webkit-flex; display: flex; -ms-flex-flow: row wrap; -webkit-flex-flow: row wrap; flex-flow: row wrap; }
#header .details span:first-child { margin-left: -0.125em; }
#header .details span.email a { color: #333333; }
#header .details br { display: none; }
#header .details br + span:before { content: "\00a0\2013\00a0"; }
#header .details br + span.author:before { content: "\00a0\22c5\00a0"; color: #333333; }
#header .details br + span#revremark:before { content: "\00a0|\00a0"; }
#header #revnumber { text-transform: capitalize; }
#header #revnumber:after { content: "\00a0"; }

#content > h1:first-child:not([class]) { color: black; border-bottom: 1px solid #dddddd; padding-bottom: 8px; margin-top: 0; padding-top: 1rem; margin-bottom: 1.25rem; }

#toc { border-bottom: 0 solid #dddddd; padding-bottom: 0.5em; }
#toc > ul { margin-left: 0.125em; }
#toc ul.sectlevel0 > li > a { font-style: italic; }
#toc ul.sectlevel0 ul.sectlevel1 { margin: 0.5em 0; }
#toc ul { font-family: Noto, sans-serif; list-style-type: none; }
#toc li { line-height: 1.3334; margin-top: 0.3334em; }
#toc a { text-decoration: none; }
#toc a:active { text-decoration: underline; }

#toctitle { color: black; font-size: 1.2em; }

@media only screen and (min-width: 768px) { #toctitle { font-size: 1.375em; }
  body.toc2 { padding-left: 15em; padding-right: 0; }
  #toc.toc2 { margin-top: 0 !important; background-color: white; position: fixed; width: 15em; left: 0; top: 0; border-right: 1px solid #dddddd; border-top-width: 0 !important; border-bottom-width: 0 !important; z-index: 1000; padding: 1.25em 1em; height: 100%; overflow: auto; }
  #toc.toc2 #toctitle { margin-top: 0; margin-bottom: 0.8rem; font-size: 1.2em; }
  #toc.toc2 > ul { font-size: 0.9em; margin-bottom: 0; }
  #toc.toc2 ul ul { margin-left: 0; padding-left: 1em; }
  #toc.toc2 ul.sectlevel0 ul.sectlevel1 { padding-left: 0; margin-top: 0.5em; margin-bottom: 0.5em; }
  body.toc2.toc-right { padding-left: 0; padding-right: 15em; }
  body.toc2.toc-right #toc.toc2 { border-right-width: 0; border-left: 1px solid #dddddd; left: auto; right: 0; } }
@media only screen and (min-width: 1280px) { body.toc2 { padding-left: 20em; padding-right: 0; }
  #toc.toc2 { width: 20em; }
  #toc.toc2 #toctitle { font-size: 1.375em; }
  #toc.toc2 > ul { font-size: 0.95em; }
  #toc.toc2 ul ul { padding-left: 1.25em; }
  body.toc2.toc-right { padding-left: 0; padding-right: 20em; } }
#content #toc { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
#content #toc > :first-child { margin-top: 0; }
#content #toc > :last-child { margin-bottom: 0; }

#footer { max-width: 100%; background-color: none; padding: 1.25em; }

#footer-text { color: black; line-height: 1.44; }

#content { margin-bottom: 0.625em; }

.sect1 { padding-bottom: 0.625em; }

@media only screen and (min-width: 768px) { #content { margin-bottom: 1.25em; }
  .sect1 { padding-bottom: 1.25em; } }
.sect1:last-child { padding-bottom: 0; }

.sect1 + .sect1 { border-top: 0 solid #dddddd; }

#content h1 > a.anchor, h2 > a.anchor, h3 > a.anchor, #toctitle > a.anchor, .sidebarblock > .content > .title > a.anchor, h4 > a.anchor, h5 > a.anchor, h6 > a.anchor { position: absolute; z-index: 1001; width: 1.5ex; margin-left: -1.5ex; display: block; text-decoration: none !important; visibility: hidden; text-align: center; font-weight: normal; }
#content h1 > a.anchor:before, h2 > a.anchor:before, h3 > a.anchor:before, #toctitle > a.anchor:before, .sidebarblock > .content > .title > a.anchor:before, h4 > a.anchor:before, h5 > a.anchor:before, h6 > a.anchor:before { content: "\00A7"; font-size: 0.85em; display: block; padding-top: 0.1em; }
#content h1:hover > a.anchor, #content h1 > a.anchor:hover, h2:hover > a.anchor, h2 > a.anchor:hover, h3:hover > a.anchor, #toctitle:hover > a.anchor, .sidebarblock > .content > .title:hover > a.anchor, h3 > a.anchor:hover, #toctitle > a.anchor:hover, .sidebarblock > .content > .title > a.anchor:hover, h4:hover > a.anchor, h4 > a.anchor:hover, h5:hover > a.anchor, h5 > a.anchor:hover, h6:hover > a.anchor, h6 > a.anchor:hover { visibility: visible; }
#content h1 > a.link, h2 > a.link, h3 > a.link, #toctitle > a.link, .sidebarblock > .content > .title > a.link, h4 > a.link, h5 > a.link, h6 > a.link { color: black; text-decoration: none; }
#content h1 > a.link:hover, h2 > a.link:hover, h3 > a.link:hover, #toctitle > a.link:hover, .sidebarblock > .content > .title > a.link:hover, h4 > a.link:hover, h5 > a.link:hover, h6 > a.link:hover { color: black; }

.audioblock, .imageblock, .literalblock, .listingblock, .stemblock, .videoblock { margin-bottom: 1.25em; }

.admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { text-rendering: optimizeLegibility; text-align: left; }

table.tableblock > caption.title { white-space: nowrap; overflow: visible; max-width: 0; }

.paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { color: black; }

table.tableblock #preamble > .sectionbody > .paragraph:first-of-type p { font-size: inherit; }

.admonitionblock > table { border-collapse: separate; border: 0; background: none; width: 100%; }
.admonitionblock > table td.icon { text-align: center; width: 80px; }
.admonitionblock > table td.icon img { max-width: initial; }
.admonitionblock > table td.icon .title { font-weight: bold; font-family: Noto, sans-serif; text-transform: uppercase; }
.admonitionblock > table td.content { padding-left: 1.125em; padding-right: 1.25em; border-left: 1px solid #dddddd; color: #5e93b8; }
.admonitionblock > table td.content > :last-child > :last-child { margin-bottom: 0; }

.exampleblock > .content { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
.exampleblock > .content > :first-child { margin-top: 0; }
.exampleblock > .content > :last-child { margin-bottom: 0; }

.sidebarblock { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
.sidebarblock > :first-child { margin-top: 0; }
.sidebarblock > :last-child { margin-bottom: 0; }
.sidebarblock > .content > .title { color: black; margin-top: 0; }

.exampleblock > .content > :last-child > :last-child, .exampleblock > .content .olist > ol > li:last-child > :last-child, .exampleblock > .content .ulist > ul > li:last-child > :last-child, .exampleblock > .content .qlist > ol > li:last-child > :last-child, .sidebarblock > .content > :last-child > :last-child, .sidebarblock > .content .olist > ol > li:last-child > :last-child, .sidebarblock > .content .ulist > ul > li:last-child > :last-child, .sidebarblock > .content .qlist > ol > li:last-child > :last-child { margin-bottom: 0; }

.literalblock pre, .listingblock pre:not(.highlight), .listingblock pre[class="highlight"], .listingblock pre[class^="highlight "], .listingblock pre.CodeRay, .listingblock pre.prettyprint { background: #eeeeee; }
.sidebarblock .literalblock pre, .sidebarblock .listingblock pre:not(.highlight), .sidebarblock .listingblock pre[class="highlight"], .sidebarblock .listingblock pre[class^="highlight "], .sidebarblock .listingblock pre.CodeRay, .sidebarblock .listingblock pre.prettyprint { background: #f2f1f1; }

.literalblock pre, .literalblock pre[class], .listingblock pre, .listingblock pre[class] { border: 1px hidden #666666; -webkit-border-radius: 0; border-radius: 0; word-wrap: break-word; padding: 1.25em 1.5625em 1.125em 1.5625em; font-size: 0.8125em; }
.literalblock pre.nowrap, .literalblock pre[class].nowrap, .listingblock pre.nowrap, .listingblock pre[class].nowrap { overflow-x: auto; white-space: pre; word-wrap: normal; }
@media only screen and (min-width: 768px) { .literalblock pre, .literalblock pre[class], .listingblock pre, .listingblock pre[class] { font-size: 0.90625em; } }
@media only screen and (min-width: 1280px) { .literalblock pre, .literalblock pre[class], .listingblock pre, .listingblock pre[class] { font-size: 1em; } }

.literalblock.output pre { color: #eeeeee; background-color: #264357; }

.listingblock pre.highlightjs { padding: 0; }
.listingblock pre.highlightjs > code { padding: 1.25em 1.5625em 1.125em 1.5625em; -webkit-border-radius: 0; border-radius: 0; }

.listingblock > .content { position: relative; }

.listingblock code[data-lang]:before { display: none; content: attr(data-lang); position: absolute; font-size: 0.75em; top: 0.425rem; right: 0.5rem; line-height: 1; text-transform: uppercase; color: #999; }

.listingblock:hover code[data-lang]:before { display: block; }

.listingblock.terminal pre .command:before { content: attr(data-prompt); padding-right: 0.5em; color: #999; }

.listingblock.terminal pre .command:not([data-prompt]):before { content: "$"; }

table.pyhltable { border-collapse: separate; border: 0; margin-bottom: 0; background: none; }

table.pyhltable td { vertical-align: top; padding-top: 0; padding-bottom: 0; line-height: 1.6; }

table.pyhltable td.code { padding-left: .75em; padding-right: 0; }

pre.pygments .lineno, table.pyhltable td:not(.code) { color: #999; padding-left: 0; padding-right: .5em; border-right: 1px solid #dddddd; }

pre.pygments .lineno { display: inline-block; margin-right: .25em; }

table.pyhltable .linenodiv { background: none !important; padding-right: 0 !important; }

.quoteblock { margin: 0 1em 0.75em 1.5em; display: table; }
.quoteblock > .title { margin-left: -1.5em; margin-bottom: 0.75em; }
.quoteblock blockquote, .quoteblock blockquote p { color: #333333; font-size: 1.15rem; line-height: 1.75; word-spacing: 0.1em; letter-spacing: 0; font-style: italic; text-align: justify; }
.quoteblock blockquote { margin: 0; padding: 0; border: 0; }
.quoteblock blockquote:before { content: "\201c"; float: left; font-size: 2.75em; font-weight: bold; line-height: 0.6em; margin-left: -0.6em; color: black; text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1); }
.quoteblock blockquote > .paragraph:last-child p { margin-bottom: 0; }
.quoteblock .attribution { margin-top: 0.5em; margin-right: 0.5ex; text-align: right; }
.quoteblock .quoteblock { margin-left: 0; margin-right: 0; padding: 0.5em 0; border-left: 3px solid #5e93b8; }
.quoteblock .quoteblock blockquote { padding: 0 0 0 0.75em; }
.quoteblock .quoteblock blockquote:before { display: none; }

.verseblock { margin: 0 1em 0.75em 1em; }
.verseblock pre { font-family: "Open Sans", "DejaVu Sans", sans; font-size: 1.15rem; color: #333333; font-weight: 300; text-rendering: optimizeLegibility; }
.verseblock pre strong { font-weight: 400; }
.verseblock .attribution { margin-top: 1.25rem; margin-left: 0.5ex; }

.quoteblock .attribution, .verseblock .attribution { font-size: 0.8125em; line-height: 1.45; font-style: italic; }
.quoteblock .attribution br, .verseblock .attribution br { display: none; }
.quoteblock .attribution cite, .verseblock .attribution cite { display: block; letter-spacing: -0.025em; color: #5e93b8; }

.quoteblock.abstract { margin: 0 0 0.75em 0; display: block; }
.quoteblock.abstract blockquote, .quoteblock.abstract blockquote p { text-align: left; word-spacing: 0; }
.quoteblock.abstract blockquote:before, .quoteblock.abstract blockquote p:first-of-type:before { display: none; }

table.tableblock { max-width: 100%; border-collapse: separate; }
table.tableblock td > .paragraph:last-child p > p:last-child, table.tableblock th > p:last-child, table.tableblock td > p:last-child { margin-bottom: 0; }

table.tableblock, th.tableblock, td.tableblock { border: 0 solid #d8d8ce; }

table.grid-all > thead > tr > .tableblock, table.grid-all > tbody > tr > .tableblock { border-width: 0 1px 1px 0; }

table.grid-all > tfoot > tr > .tableblock { border-width: 1px 1px 0 0; }

table.grid-cols > * > tr > .tableblock { border-width: 0 1px 0 0; }

table.grid-rows > thead > tr > .tableblock, table.grid-rows > tbody > tr > .tableblock { border-width: 0 0 1px 0; }

table.grid-rows > tfoot > tr > .tableblock { border-width: 1px 0 0 0; }

table.grid-all > * > tr > .tableblock:last-child, table.grid-cols > * > tr > .tableblock:last-child { border-right-width: 0; }

table.grid-all > tbody > tr:last-child > .tableblock, table.grid-all > thead:last-child > tr > .tableblock, table.grid-rows > tbody > tr:last-child > .tableblock, table.grid-rows > thead:last-child > tr > .tableblock { border-bottom-width: 0; }

table.frame-all { border-width: 1px; }

table.frame-sides { border-width: 0 1px; }

table.frame-topbot { border-width: 1px 0; }

th.halign-left, td.halign-left { text-align: left; }

th.halign-right, td.halign-right { text-align: right; }

th.halign-center, td.halign-center { text-align: center; }

th.valign-top, td.valign-top { vertical-align: top; }

th.valign-bottom, td.valign-bottom { vertical-align: bottom; }

th.valign-middle, td.valign-middle { vertical-align: middle; }

table thead th, table tfoot th { font-weight: bold; }

tbody tr th { display: table-cell; line-height: 1.4; background: -webkit-linear-gradient(top, #add386, #90b66a); }

tbody tr th, tbody tr th p, tfoot tr th, tfoot tr th p { color: white; font-weight: bold; }

p.tableblock > code:only-child { background: none; padding: 0; }

p.tableblock { font-size: 1em; }

td > div.verse { white-space: pre; }

ol { margin-left: 1.75em; }

ul li ol { margin-left: 1.5em; }

dl dd { margin-left: 1.125em; }

dl dd:last-child, dl dd:last-child > :last-child { margin-bottom: 0; }

ol > li p, ul > li p, ul dd, ol dd, .olist .olist, .ulist .ulist, .ulist .olist, .olist .ulist { margin-bottom: 0.375em; }

ul.checklist, ul.none, ol.none, ul.no-bullet, ol.no-bullet, ol.unnumbered, ul.unstyled, ol.unstyled { list-style-type: none; }

ul.no-bullet, ol.no-bullet, ol.unnumbered { margin-left: 0.625em; }

ul.unstyled, ol.unstyled { margin-left: 0; }

ul.checklist { margin-left: 0.625em; }

ul.checklist li > p:first-child > .fa-square-o:first-child, ul.checklist li > p:first-child > .fa-check-square-o:first-child { width: 1.25em; font-size: 0.8em; position: relative; bottom: 0.125em; }

ul.checklist li > p:first-child > input[type="checkbox"]:first-child { margin-right: 0.25em; }

ul.inline { display: -ms-flexbox; display: -webkit-box; display: flex; -ms-flex-flow: row wrap; -webkit-flex-flow: row wrap; flex-flow: row wrap; list-style: none; margin: 0 0 0.375em -0.75em; }

ul.inline > li { margin-left: 0.75em; }

.unstyled dl dt { font-weight: normal; font-style: normal; }

ol.arabic { list-style-type: decimal; }

ol.decimal { list-style-type: decimal-leading-zero; }

ol.loweralpha { list-style-type: lower-alpha; }

ol.upperalpha { list-style-type: upper-alpha; }

ol.lowerroman { list-style-type: lower-roman; }

ol.upperroman { list-style-type: upper-roman; }

ol.lowergreek { list-style-type: lower-greek; }

.hdlist > table, .colist > table { border: 0; background: none; }
.hdlist > table > tbody > tr, .colist > table > tbody > tr { background: none; }

td.hdlist1, td.hdlist2 { vertical-align: top; padding: 0 0.625em; }

td.hdlist1 { font-weight: bold; padding-bottom: 0.75em; }

.literalblock + .colist, .listingblock + .colist { margin-top: -0.5em; }

.colist > table tr > td:first-of-type { padding: 0.4em 0.75em 0 0.75em; line-height: 1; vertical-align: top; }
.colist > table tr > td:first-of-type img { max-width: initial; }
.colist > table tr > td:last-of-type { padding: 0.25em 0; }

.thumb, .th { line-height: 0; display: inline-block; border: solid 4px white; -webkit-box-shadow: 0 0 0 1px #dddddd; box-shadow: 0 0 0 1px #dddddd; }

.imageblock.left, .imageblock[style*="float: left"] { margin: 0.25em 0.625em 1.25em 0; }
.imageblock.right, .imageblock[style*="float: right"] { margin: 0.25em 0 1.25em 0.625em; }
.imageblock > .title { margin-bottom: 0; }
.imageblock.thumb, .imageblock.th { border-width: 6px; }
.imageblock.thumb > .title, .imageblock.th > .title { padding: 0 0.125em; }

.image.left, .image.right { margin-top: 0.25em; margin-bottom: 0.25em; display: inline-block; line-height: 0; }
.image.left { margin-right: 0.625em; }
.image.right { margin-left: 0.625em; }

a.image { text-decoration: none; display: inline-block; }
a.image object { pointer-events: none; }

sup.footnote, sup.footnoteref { font-size: 0.875em; position: static; vertical-align: super; }
sup.footnote a, sup.footnoteref a { text-decoration: none; }
sup.footnote a:active, sup.footnoteref a:active { text-decoration: underline; }

#footnotes { padding-top: 0.75em; padding-bottom: 0.75em; margin-bottom: 0.625em; }
#footnotes hr { width: 20%; min-width: 6.25em; margin: -0.25em 0 0.75em 0; border-width: 1px 0 0 0; }
#footnotes .footnote { padding: 0 0.375em 0 0.225em; line-height: 1.3334; font-size: 0.875em; margin-left: 1.2em; margin-bottom: 0.2em; }
#footnotes .footnote a:first-of-type { font-weight: bold; text-decoration: none; margin-left: -1.05em; }
#footnotes .footnote:last-of-type { margin-bottom: 0; }
#content #footnotes { margin-top: -0.625em; margin-bottom: 0; padding: 0.75em 0; }

.gist .file-data > table { border: 0; background: #fff; width: 100%; margin-bottom: 0; }
.gist .file-data > table td.line-data { width: 99%; }

div.unbreakable { page-break-inside: avoid; }

.big { font-size: larger; }

.small { font-size: smaller; }

.underline { text-decoration: underline; }

.overline { text-decoration: overline; }

.line-through { text-decoration: line-through; }

.aqua { color: #00bfbf; }

.aqua-background { background-color: #00fafa; }

.black { color: black; }

.black-background { background-color: black; }

.blue { color: #0000bf; }

.blue-background { background-color: #0000fa; }

.fuchsia { color: #bf00bf; }

.fuchsia-background { background-color: #fa00fa; }

.gray { color: #606060; }

.gray-background { background-color: #7d7d7d; }

.green { color: #006000; }

.green-background { background-color: #007d00; }

.lime { color: #00bf00; }

.lime-background { background-color: #00fa00; }

.maroon { color: #600000; }

.maroon-background { background-color: #7d0000; }

.navy { color: #000060; }

.navy-background { background-color: #00007d; }

.olive { color: #606000; }

.olive-background { background-color: #7d7d00; }

.purple { color: #600060; }

.purple-background { background-color: #7d007d; }

.red { color: #bf0000; }

.red-background { background-color: #fa0000; }

.silver { color: #909090; }

.silver-background { background-color: #bcbcbc; }

.teal { color: #006060; }

.teal-background { background-color: #007d7d; }

.white { color: #bfbfbf; }

.white-background { background-color: #fafafa; }

.yellow { color: #bfbf00; }

.yellow-background { background-color: #fafa00; }

span.icon > .fa { cursor: default; }
a span.icon > .fa { cursor: inherit; }

.admonitionblock td.icon [class^="fa icon-"] { font-size: 2.5em; text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5); cursor: default; }
.admonitionblock td.icon .icon-note:before { content: "\f05a"; color: #29475c; }
.admonitionblock td.icon .icon-tip:before { content: "\f0eb"; text-shadow: 1px 1px 2px rgba(155, 155, 0, 0.8); color: #111; }
.admonitionblock td.icon .icon-warning:before { content: "\f071"; color: #bf6900; }
.admonitionblock td.icon .icon-caution:before { content: "\f06d"; color: #bf3400; }
.admonitionblock td.icon .icon-important:before { content: "\f06a"; color: #bf0000; }

.conum[data-value] { display: inline-block; color: #fff !important; background-color: black; -webkit-border-radius: 100px; border-radius: 100px; text-align: center; font-size: 0.75em; width: 1.67em; height: 1.67em; line-height: 1.67em; font-family: "Open Sans", "DejaVu Sans", sans-serif; font-style: normal; font-weight: bold; }
.conum[data-value] * { color: #fff !important; }
.conum[data-value] + b { display: none; }
.conum[data-value]:after { content: attr(data-value); }
pre .conum[data-value] { position: relative; top: -0.125em; }

b.conum * { color: inherit !important; }

.conum:not([data-value]):empty { display: none; }

h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { border-bottom: 1px solid #dddddd; }

.sect1 { padding-bottom: 0; }

#toctitle { color: #00406F; font-weight: normal; margin-top: 1.5em; }

.sidebarblock { border-color: #aaa; }

code { -webkit-border-radius: 4px; border-radius: 4px; }

p.tableblock.header { color: #6d6e71; }

.literalblock pre, .listingblock pre { background: #eeeeee; }

</style>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<style>
/* Stylesheet for CodeRay to match GitHub theme | MIT License | http://foundation.zurb.com */
/*pre.CodeRay {background-color:#f7f7f8;}*/
.CodeRay .line-numbers{border-right:1px solid #d8d8d8;padding:0 0.5em 0 .25em}
.CodeRay span.line-numbers{display:inline-block;margin-right:.5em;color:rgba(0,0,0,.3)}
.CodeRay .line-numbers strong{color:rgba(0,0,0,.4)}
table.CodeRay{border-collapse:separate;border-spacing:0;margin-bottom:0;border:0;background:none}
table.CodeRay td{vertical-align: top;line-height:1.45}
table.CodeRay td.line-numbers{text-align:right}
table.CodeRay td.line-numbers>pre{padding:0;color:rgba(0,0,0,.3)}
table.CodeRay td.code{padding:0 0 0 .5em}
table.CodeRay td.code>pre{padding:0}
.CodeRay .debug{color:#fff !important;background:#000080 !important}
.CodeRay .annotation{color:#007}
.CodeRay .attribute-name{color:#000080}
.CodeRay .attribute-value{color:#700}
.CodeRay .binary{color:#509}
.CodeRay .comment{color:#998;font-style:italic}
.CodeRay .char{color:#04d}
.CodeRay .char .content{color:#04d}
.CodeRay .char .delimiter{color:#039}
.CodeRay .class{color:#458;font-weight:bold}
.CodeRay .complex{color:#a08}
.CodeRay .constant,.CodeRay .predefined-constant{color:#008080}
.CodeRay .color{color:#099}
.CodeRay .class-variable{color:#369}
.CodeRay .decorator{color:#b0b}
.CodeRay .definition{color:#099}
.CodeRay .delimiter{color:#000}
.CodeRay .doc{color:#970}
.CodeRay .doctype{color:#34b}
.CodeRay .doc-string{color:#d42}
.CodeRay .escape{color:#666}
.CodeRay .entity{color:#800}
.CodeRay .error{color:#808}
.CodeRay .exception{color:inherit}
.CodeRay .filename{color:#099}
.CodeRay .function{color:#900;font-weight:bold}
.CodeRay .global-variable{color:#008080}
.CodeRay .hex{color:#058}
.CodeRay .integer,.CodeRay .float{color:#099}
.CodeRay .include{color:#555}
.CodeRay .inline{color:#000}
.CodeRay .inline .inline{background:#ccc}
.CodeRay .inline .inline .inline{background:#bbb}
.CodeRay .inline .inline-delimiter{color:#d14}
.CodeRay .inline-delimiter{color:#d14}
.CodeRay .important{color:#555;font-weight:bold}
.CodeRay .interpreted{color:#b2b}
.CodeRay .instance-variable{color:#008080}
.CodeRay .label{color:#970}
.CodeRay .local-variable{color:#963}
.CodeRay .octal{color:#40e}
.CodeRay .predefined{color:#369}
.CodeRay .preprocessor{color:#579}
.CodeRay .pseudo-class{color:#555}
.CodeRay .directive{font-weight:bold}
.CodeRay .type{font-weight:bold}
.CodeRay .predefined-type{color:inherit}
.CodeRay .reserved,.CodeRay .keyword {color:#000;font-weight:bold}
.CodeRay .key{color:#808}
.CodeRay .key .delimiter{color:#606}
.CodeRay .key .char{color:#80f}
.CodeRay .value{color:#088}
.CodeRay .regexp .delimiter{color:#808}
.CodeRay .regexp .content{color:#808}
.CodeRay .regexp .modifier{color:#808}
.CodeRay .regexp .char{color:#d14}
.CodeRay .regexp .function{color:#404;font-weight:bold}
.CodeRay .string{color:#d20}
.CodeRay .string .string .string{background:#ffd0d0}
.CodeRay .string .content{color:#d14}
.CodeRay .string .char{color:#d14}
.CodeRay .string .delimiter{color:#d14}
.CodeRay .shell{color:#d14}
.CodeRay .shell .delimiter{color:#d14}
.CodeRay .symbol{color:#990073}
.CodeRay .symbol .content{color:#a60}
.CodeRay .symbol .delimiter{color:#630}
.CodeRay .tag{color:#008080}
.CodeRay .tag-special{color:#d70}
.CodeRay .variable{color:#036}
.CodeRay .insert{background:#afa}
.CodeRay .delete{background:#faa}
.CodeRay .change{color:#aaf;background:#007}
.CodeRay .head{color:#f8f;background:#505}
.CodeRay .insert .insert{color:#080}
.CodeRay .delete .delete{color:#800}
.CodeRay .change .change{color:#66f}
.CodeRay .head .head{color:#f4f}
</style>
<link rel="stylesheet" href="../katex/katex.min.css">
<script src="../katex/katex.min.js"></script>
<script src="../katex/contrib/auto-render.min.js"></script>
    <!-- Use KaTeX to render math once document is loaded, see
         https://github.com/Khan/KaTeX/tree/master/contrib/auto-render -->
<script>
    document.addEventListener("DOMContentLoaded", function () {
        renderMathInElement(
            document.body,
            {
                delimiters: [
                    { left: "$$", right: "$$", display: true},
                    { left: "\\[", right: "\\]", display: true},
                    { left: "$", right: "$", display: false},
                    { left: "\\(", right: "\\)", display: false}
                ]
            }
        );
    });
</script></head>
<body class="book toc2 toc-left" style="max-width: 100;">
<div id="header">
<h1>OpenCL<sup>&#8482;</sup> ICD Installation Guidelines</h1>
<div class="details">
<span id="author" class="author">Khronos<sup>&#174;</sup> OpenCL Working Group</span><br>
<span id="revnumber">version V2.2-11,</span>
<span id="revdate">Fri, 19 Jul 2019 14:14:06 +0000</span>
<br><span id="revremark">from git branch: master commit: 2aaf7b58ead9567d8799b22ecc748b4892a1e04e</span>
</div>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_introduction">1. Introduction</a></li>
<li><a href="#_general_guidelines">2. General Guidelines</a>
<ul class="sectlevel2">
<li><a href="#_compatibility_with_non_icd_implementations">2.1. Compatibility With Non-ICD implementations</a></li>
</ul>
</li>
<li><a href="#_windows_icd_installation_and_uninstallation">3. Windows ICD Installation and Uninstallation</a>
<ul class="sectlevel2">
<li><a href="#_windows_icd_installation">3.1. Windows ICD Installation</a></li>
<li><a href="#_windows_icd_uninstallation">3.2. Windows ICD Uninstallation</a></li>
<li><a href="#_opencl_dll_versioning">3.3. OpenCL.dll Versioning</a></li>
</ul>
</li>
<li><a href="#_android_icd_installation">4. Android ICD Installation</a>
<ul class="sectlevel2">
<li><a href="#_target_device_filesystem">4.1. Target Device Filesystem</a></li>
<li><a href="#_android_sdkndk">4.2. Android SDK/NDK</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Copyright 2008-2019 The Khronos Group.</p>
</div>
<div class="paragraph">
<p>This specification is protected by copyright laws and contains material proprietary
to the Khronos Group, Inc. Except as described by these terms, it or any components
may not be reproduced, republished, distributed, transmitted, displayed, broadcast
or otherwise exploited in any manner without the express prior written permission
of Khronos Group.</p>
</div>
<div class="paragraph">
<p>Khronos Group grants a conditional copyright license to use and reproduce the
unmodified specification for any purpose, without fee or royalty, EXCEPT no licenses
to any patent, trademark or other intellectual property rights are granted under
these terms. Parties desiring to implement the specification and make use of
Khronos trademarks in relation to that implementation, and receive reciprocal patent
license protection under the Khronos IP Policy must become Adopters and confirm the
implementation as conformant under the process defined by Khronos for this
specification; see <a href="https://www.khronos.org/adopters" class="bare">https://www.khronos.org/adopters</a>.</p>
</div>
<div class="paragraph">
<p>Khronos Group makes no, and expressly disclaims any, representations or warranties,
express or implied, regarding this specification, including, without limitation:
merchantability, fitness for a particular purpose, non-infringement of any
intellectual property, correctness, accuracy, completeness, timeliness, and
reliability. Under no circumstances will the Khronos Group, or any of its Promoters,
Contributors or Members, or their respective partners, officers, directors,
employees, agents or representatives be liable for any damages, whether direct,
indirect, special or consequential damages for lost revenues, lost profits, or
otherwise, arising from or in connection with these materials.</p>
</div>
<div class="paragraph">
<p>Vulkan and Khronos are registered trademarks, and OpenXR, SPIR, SPIR-V, SYCL, WebGL,
WebCL, OpenVX, OpenVG, EGL, COLLADA, glTF, NNEF, OpenKODE, OpenKCAM, StreamInput,
OpenWF, OpenSL ES, OpenMAX, OpenMAX AL, OpenMAX IL, OpenMAX DL, OpenML and DevU are
trademarks of the Khronos Group Inc. ASTC is a trademark of ARM Holdings PLC,
OpenCL is a trademark of Apple Inc. and OpenGL and OpenML are registered trademarks
and the OpenGL ES and OpenGL SC logos are trademarks of Silicon Graphics
International used under license by Khronos. All other product names, trademarks,
and/or company names are used solely for identification and belong to their
respective owners.</p>
</div>
<div style="page-break-after: always;"></div>
</div>
</div>
<div class="sect1">
<h2 id="_introduction">1. Introduction</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The OpenCL Installable Client Driver (ICD) is a mechanism to allow OpenCL implementations from multiple vendors to coexist on a system. A vendor OpenCL implementation is an OpenCL Installable Client Driver if it implements the extension <code>cl_khr_icd</code>, which is described in the OpenCL extension registry:</p>
</div>
<div class="paragraph">
<p><a href="https://www.khronos.org/registry/OpenCL/extensions/khr/cl_khr_icd.txt" class="bare">https://www.khronos.org/registry/OpenCL/extensions/khr/cl_khr_icd.txt</a></p>
</div>
<div class="paragraph">
<p>The ICD loader library is a shared resource that discovers and enumerates all OpenCL ICDs. It will typically be installed by an installer from one of the vendors.</p>
</div>
<div class="paragraph">
<p>In order to prevent conflicts between vendor installers it is necessary to have strict guidelines for installation and uninstallation of the ICD loader library and associated system configuration.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_general_guidelines">2. General Guidelines</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Vendor installers MUST install and uninstall their ICD-compliant implementations in such a way that the installer:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Installs its own ICD loader library if and only if the existing ICD loader library is older than the one being installed.</p>
</li>
<li>
<p>Does not remove ICD loader library at uninstall if other implementations exist.</p>
</li>
<li>
<p>Does not cause existing installations to become inoperable or unusable in any way. This includes, but is not limited to, WHQL and similar signed package certification check failures.</p>
</li>
<li>
<p>Does not manipulate the vendor enumeration order within the ICD loader library except to add (or remove) the new vendor implementation.</p>
</li>
</ol>
</div>
<div class="sect2">
<h3 id="_compatibility_with_non_icd_implementations">2.1. Compatibility With Non-ICD implementations</h3>
<div class="paragraph">
<p>Because the ICD loader library and a non-ICD OpenCL implementation are likely to share the same library file name, behavior is undefined if the ICD loader library is installed on a system with an existing non-ICD OpenCL implementation, or if a non-ICD OpenCL implementation is installed on a system with an existing ICD loader library. In particular, in this scenario the non-ICD OpenCL implementation, or the ICD OpenCL implementation, or both, may cease to function correctly.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_windows_icd_installation_and_uninstallation">3. Windows ICD Installation and Uninstallation</h2>
<div class="sectionbody">
<div class="paragraph">
<p>On Windows, the ICD loader library is <code>OpenCL.dll</code>.</p>
</div>
<div class="paragraph">
<p>In general, Windows Vendor installers MUST follow the guidelines described here:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://msdn.microsoft.com/en-us/library/ms954376.aspx" class="bare">https://msdn.microsoft.com/en-us/library/ms954376.aspx</a></p>
</li>
</ul>
</div>
<div class="paragraph">
<p>If the Windows Vendor installer is using the <em>Windows Installer</em> then many of the steps below will happen automatically.</p>
</div>
<div class="sect2">
<h3 id="_windows_icd_installation">3.1. Windows ICD Installation</h3>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Vendor MAY include <code>OpenCL.dll</code> file in its vendor package.</p>
</li>
<li>
<p>IF Vendor includes <code>OpenCL.dll</code> in the manifest of the signed vendor package, then Vendor MUST NOT include <code>OpenCL.dll</code> in the manifest of the signed vendor package to map to either of the following paths:</p>
<div class="olist loweralpha">
<ol class="loweralpha" type="a">
<li>
<p><code>%WINDIR%\system32\OpenCL.dll</code></p>
</li>
<li>
<p><code>%WINDIR%\SysWOW64\OpenCL.dll</code></p>
</li>
</ol>
</div>
<div class="paragraph">
<p>Vendor MAY include <code>OpenCL.dll</code> in the manifest of a signed package provided that a vendor specific directory is used, such as <code>%PROGRAMFILES%\&lt;vendor&gt;\OpenCL</code>.</p>
</div>
</li>
<li>
<p>Vendor MUST check for existing OpenCL installations before installing <code>OpenCL.dll</code>.</p>
<div class="olist loweralpha">
<ol class="loweralpha" type="a">
<li>
<p>Vendor SHALL check the version of <code>OpenCL.dll</code> located in</p>
<div class="olist lowerroman">
<ol class="lowerroman" type="i">
<li>
<p><code>%WINDIR%\System32\</code></p>
</li>
<li>
<p><code>%WINDIR%\SysWOW64\</code></p>
</li>
</ol>
</div>
</li>
<li>
<p>IF <code>OpenCL.dll</code> is not present, install ICD in 3.a.i and/or 3.a.ii as appropriate.</p>
</li>
<li>
<p>IF version of installed <code>OpenCL.dll</code> &lt; vendor <code>OpenCL.dll</code> version, then replace the installed <code>OpenCL.dll</code> in 3.a.i and/or 3.a.ii as appropriate.</p>
</li>
<li>
<p>IF version of installed <code>OpenCL.dll</code> &gt;= vendor <code>OpenCL.dll</code> version, then vendor MUST NOT modify the installed <code>OpenCL.dll</code>.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>Versioning of <code>OpenCL.dll</code> is described in a later section.</p>
</div>
</li>
<li>
<p>Vendor MUST accurately increment the reference count for <code>OpenCL.dll</code>.</p>
<div class="olist loweralpha">
<ol class="loweralpha" type="a">
<li>
<p>IF Vendor does not use the Windows Installer, the Vendor installer MUST increment the reference count under the registry key:</p>
<div class="literalblock">
<div class="content">
<pre>HKLM\SOFTWARE\Microsoft\Windows\Current Version\SharedDLLs</pre>
</div>
</div>
</li>
</ol>
</div>
</li>
</ol>
</div>
</div>
<div class="sect2">
<h3 id="_windows_icd_uninstallation">3.2. Windows ICD Uninstallation</h3>
<div class="paragraph">
<p>Uninstalling <code>OpenCL.dll</code> should be straightforward since it is reference counted as a shared component.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Vendor MUST accurately decrement the reference count for <code>OpenCL.dll</code> and delete it when the reference count reaches zero.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>Note that older installers that do not comply with these guidelines may not check the reference count when uninstalling and hence may erroneously uninstall <code>OpenCL.dll</code> while it is still in use by another OpenCL implementation.  If this occurs, reinstalling the other OpenCL implementation will usually fix the issue.</p>
</div>
</div>
<div class="sect2">
<h3 id="_opencl_dll_versioning">3.3. OpenCL.dll Versioning</h3>
<div class="paragraph">
<p>The <code>OpenCL.dll</code> has a FileVersion string of the form “x.y.z.0”. The parts <strong><em>x</em></strong> and <strong><em>y</em></strong> denote the OpenCL major and minor version (2.2 at the time of writing this document). The third part <strong><em>z</em></strong> is a revision number which will be incremented for every change made to the ICD loader sources.</p>
</div>
<div class="paragraph">
<p>For same version of OpenCL, higher <strong><em>z</em></strong> value means a later revision. For different versions of OpenCL a higher OpenCL version means a later revision, irrespective of the value of <strong><em>z</em></strong>.</p>
</div>
<div class="paragraph">
<p>If a given OpenCL.dll file does not have a valid FileVersion string or if the FileVersion string is absent then the version should be considered to be "0.0.0.0".</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_android_icd_installation">4. Android ICD Installation</h2>
<div class="sectionbody">
<div class="paragraph">
<p>On Android, the ICD loader library is <code>libOpenCL.so</code>.</p>
</div>
<div class="sect2">
<h3 id="_target_device_filesystem">4.1. Target Device Filesystem</h3>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Vendor MUST install <code>libOpenCL.so</code> to reside directly within the directory <code>/vendor/lib/</code> which is one of the paths searched by the dynamic loader on an Android system.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>Usually an Android system will have a single-vendor OpenCL installation, so the need to overwrite <code>libOpenCL.so</code> should not arise.</p>
</div>
</div>
<div class="sect2">
<h3 id="_android_sdkndk">4.2. Android SDK/NDK</h3>
<div class="paragraph">
<p>Vendors should package the <code>libOpenCL.so</code> stub for linking to user applications in their Android SDK/NDK and either configure the default environment, or provide instructions for configuring the build environment, or both.</p>
</div>
<div class="paragraph">
<p>Typically a vendor should put <code>libOpenCL.so</code> inside a directory within the Android SDK/NDK package provided by the vendor for application development on the vendor’s device. The path to this directory should be added to LIBPATH in the default environment of the IDE (e.g. Eclipse) and other build configurations (e.g. Makefiles) in the SDK/NDK. The path should also be mentioned in the vendor documentation to allow application developers to write their own Makefiles or other build systems.</p>
</div>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Version V2.2-11<br>
Last updated 2019-07-19 08:25:57 EDT
</div>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.4/MathJax.js?config=TeX-MML-AM_HTMLorMML"></script>
</body>
</html>