tree 1a44f54f0d358218d18549bb8c89549ae73f393b
parent ac897edeb16a449c6e519e13ddf3decd8a6cb763
author Chris Mumford <cmumford@google.com> 1685107983 -0700
committer SkCQ <skcq-be@skia-corp.google.com.iam.gserviceaccount.com> 1685114595 +0000

Add show_includes GN build argument

Add a show_includes GN build argument which is used for include
file analysis. show_includes requires clang to be used and adds
the -H compile argument. This produces output that can be analyzed
to understand all header files included by the source file being
compiled. Here is a sample of the output:

```
[11/1330] clang++-14 -H <other-flags...> -c \
  ../../src/gpu/ganesh/GrAHardwareBufferImageGenerator.cpp -o \
  obj/src/gpu/ganesh/gpu.GrAHardwareBufferImageGenerator.o
. ../../include/core/SkTypes.h
.. ../../include/private/base/SkFeatures.h
.. ../../include/private/base/SkLoadUserConfig.h
... ../../include/private/base/SkFeatures.h
... ../../include/config/SkUserConfig.h
.. ../../include/private/base/SkAPI.h
... ../../include/private/base/SkLoadUserConfig.h

<many other headers>
```

Bug: skia:12159
Change-Id: Ideeb6daa9fd27cb8f5be02f358b0d1c8c5f6dc91
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/703456
Auto-Submit: Chris Mumford <cmumford@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Chris Mumford <cmumford@google.com>