diff --git a/ChangeLog b/ChangeLog
index 39d2e89..c305860 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,45 @@
+2020-07-07  Werner Lemberg  <wl@gnu.org>
+
+	Fix clang warnings.
+
+	* include/freetype/internal/autohint.h
+	(FT_DECLARE_AUTOHINTER_INTERFACE): New macro.
+	* src/autofit/afmodule.h: Use it to declare
+	`af_autofitter_interface'.
+
+	* include/freetype/internal/ftobjs.h (FT_DECLARE_GLYPH): New macro.
+	* src/base/ftbase.h: Use it to declare `ft_bitmap_glyph_class' and
+	`ft_outline_glyph_class'.
+
+	* src/base/ftglyph.c: Include `ftbase.h'.
+
+	* src/cff/cffparse.c (cff_parser_run): Fix type of `t2_size'.
+
+	* src/pcf/pcfdrivr.c (pcf_cmap_char_next): Fix type of `result'.
+
+	* src/psaux/psauxmod.c (psaux_module_class): Use `FT_DEFINE_MODULE'.
+	* src/psaux/psauxmod.h: Declare `afm_parser_funcs',
+	`t1_cmap_classes', `cff_decoder_funcs', and `psaux_module_class'.
+
+	* src/pshinter/pshmod.c: Include `pshmod.h'.
+
+	* src/sfnt/sfwoff2.c (ROUND4, WRITE_SHORT): Fix implicit sign
+	conversion.
+	(compute_ULong_sum): Fix return type.
+	Fix implicit sign conversion.
+	(store_points): Fix type of `last_flag', `repeat_count', and `flag'.
+	Use casts to avoid warnings.
+	(reconstruct_glyf): Fix implicit sign conversion.
+	Use cast to avoid warning.
+	(get_x_mins): Fix implicit sign conversion.
+	* src/sfnt/ttcmap.c: Undef `TTCMAPCITEM'.
+	* src/sfnt/ttcmap.h: Define `TTCMAPCITEM' and include `ttcmapc.h' to
+	declare cmap classes.
+
+	* src/smooth/ftsmooth.c (ft_smooth_overlap_spans): Use cast.
+
+	* src/truetype/ttinterp.c (Ins_MIAP): Fix typo.
+
 2020-07-07  David Turner  <david@freetype.org>
 
 	[build] Really fix multi and C++ builds.
diff --git a/include/freetype/internal/autohint.h b/include/freetype/internal/autohint.h
index d4220a2..2a472e2 100644
--- a/include/freetype/internal/autohint.h
+++ b/include/freetype/internal/autohint.h
@@ -207,6 +207,9 @@
   } FT_AutoHinter_InterfaceRec, *FT_AutoHinter_Interface;
 
 
+#define FT_DECLARE_AUTOHINTER_INTERFACE( class_ )            \
+  FT_CALLBACK_TABLE const FT_AutoHinter_InterfaceRec  class_;
+
 #define FT_DEFINE_AUTOHINTER_INTERFACE(       \
           class_,                             \
           reset_face_,                        \
diff --git a/include/freetype/internal/ftobjs.h b/include/freetype/internal/ftobjs.h
index 07c5e70..25db2c4 100644
--- a/include/freetype/internal/ftobjs.h
+++ b/include/freetype/internal/ftobjs.h
@@ -226,8 +226,8 @@
   } FT_CMap_ClassRec;
 
 
-#define FT_DECLARE_CMAP_CLASS( class_ )              \
-  FT_CALLBACK_TABLE const  FT_CMap_ClassRec class_;
+#define FT_DECLARE_CMAP_CLASS( class_ )            \
+  FT_CALLBACK_TABLE const FT_CMap_ClassRec  class_;
 
 #define FT_DEFINE_CMAP_CLASS(       \
           class_,                   \
@@ -1057,6 +1057,9 @@
    *   The struct will be allocated in the global scope (or the scope where
    *   the macro is used).
    */
+#define FT_DECLARE_GLYPH( class_ )                \
+  FT_CALLBACK_TABLE const FT_Glyph_Class  class_;
+
 #define FT_DEFINE_GLYPH(          \
           class_,                 \
           size_,                  \
diff --git a/src/autofit/afmodule.c b/src/autofit/afmodule.c
index 95d58b8..f52b2b2 100644
--- a/src/autofit/afmodule.c
+++ b/src/autofit/afmodule.c
@@ -550,8 +550,8 @@
     NULL,                                                    /* reset_face */
     NULL,                                              /* get_global_hints */
     NULL,                                             /* done_global_hints */
-    (FT_AutoHinter_GlyphLoadFunc)af_autofitter_load_glyph )  /* load_glyph */
-
+    (FT_AutoHinter_GlyphLoadFunc)af_autofitter_load_glyph    /* load_glyph */
+  )
 
   FT_DEFINE_MODULE(
     autofit_module_class,
diff --git a/src/autofit/afmodule.h b/src/autofit/afmodule.h
index 74c4ff6..e8fe4a9 100644
--- a/src/autofit/afmodule.h
+++ b/src/autofit/afmodule.h
@@ -46,6 +46,7 @@
   } AF_ModuleRec, *AF_Module;
 
 
+FT_DECLARE_AUTOHINTER_INTERFACE( af_autofitter_interface )
 FT_DECLARE_MODULE( autofit_module_class )
 
 
diff --git a/src/base/ftbase.h b/src/base/ftbase.h
index b03922a..25afa9b 100644
--- a/src/base/ftbase.h
+++ b/src/base/ftbase.h
@@ -26,6 +26,10 @@
 FT_BEGIN_HEADER
 
 
+  FT_DECLARE_GLYPH( ft_bitmap_glyph_class )
+  FT_DECLARE_GLYPH( ft_outline_glyph_class )
+
+
 #ifdef FT_CONFIG_OPTION_MAC_FONTS
 
   /* MacOS resource fork cannot exceed 16MB at least for Carbon code; */
diff --git a/src/base/ftglyph.c b/src/base/ftglyph.c
index 78dff7f..825eba2 100644
--- a/src/base/ftglyph.c
+++ b/src/base/ftglyph.c
@@ -35,6 +35,8 @@
 #include <freetype/ftbitmap.h>
 #include <freetype/internal/ftobjs.h>
 
+#include "ftbase.h"
+
 
   /**************************************************************************
    *
diff --git a/src/cff/cffcmap.h b/src/cff/cffcmap.h
index fc6bd90..69fab8d 100644
--- a/src/cff/cffcmap.h
+++ b/src/cff/cffcmap.h
@@ -43,7 +43,7 @@
   } CFF_CMapStdRec;
 
 
-  FT_DECLARE_CMAP_CLASS(cff_cmap_encoding_class_rec)
+  FT_DECLARE_CMAP_CLASS( cff_cmap_encoding_class_rec )
 
 
   /*************************************************************************/
@@ -56,7 +56,7 @@
 
   /* unicode (synthetic) cmaps */
 
-  FT_DECLARE_CMAP_CLASS(cff_cmap_unicode_class_rec)
+  FT_DECLARE_CMAP_CLASS( cff_cmap_unicode_class_rec )
 
 
 FT_END_HEADER
diff --git a/src/cff/cffparse.c b/src/cff/cffparse.c
index 25c90d2..758788e 100644
--- a/src/cff/cffparse.c
+++ b/src/cff/cffparse.c
@@ -1263,11 +1263,11 @@
         FT_Byte*     charstring_base;
         FT_ULong     charstring_len;
 
-        FT_Fixed*     stack;
-        FT_ListNode   node;
-        CFF_T2_String t2;
-        size_t        t2_size;
-        FT_Byte*      q;
+        FT_Fixed*      stack;
+        FT_ListNode    node;
+        CFF_T2_String  t2;
+        FT_Fixed       t2_size;
+        FT_Byte*       q;
 
 
         charstring_base = ++p;
diff --git a/src/pcf/pcfdrivr.c b/src/pcf/pcfdrivr.c
index b0b5ee4..f68e60e 100644
--- a/src/pcf/pcfdrivr.c
+++ b/src/pcf/pcfdrivr.c
@@ -136,7 +136,7 @@
     FT_UInt32  charcode  = *acharcode;
     FT_UShort  charcodeRow;
     FT_UShort  charcodeCol;
-    FT_Int     result = 0;
+    FT_UInt    result = 0;
 
 
     while ( charcode < (FT_UInt32)( enc->lastRow * 256 + enc->lastCol ) )
diff --git a/src/psaux/psauxmod.c b/src/psaux/psauxmod.c
index bfc507c..e73ba22 100644
--- a/src/psaux/psauxmod.c
+++ b/src/psaux/psauxmod.c
@@ -170,9 +170,9 @@
   };
 
 
-  FT_CALLBACK_TABLE_DEF
-  const FT_Module_Class  psaux_module_class =
-  {
+  FT_DEFINE_MODULE(
+    psaux_module_class,
+
     0,
     sizeof ( FT_ModuleRec ),
     "psaux",
@@ -184,7 +184,7 @@
     (FT_Module_Constructor)NULL,  /* module_init   */
     (FT_Module_Destructor) NULL,  /* module_done   */
     (FT_Module_Requester)  NULL   /* get_interface */
-  };
+  )
 
 
 /* END */
diff --git a/src/psaux/psauxmod.h b/src/psaux/psauxmod.h
index 400d0ea..a6bebe4 100644
--- a/src/psaux/psauxmod.h
+++ b/src/psaux/psauxmod.h
@@ -34,10 +34,24 @@
   FT_CALLBACK_TABLE
   const PS_Builder_FuncsRec   ps_builder_funcs;
 
+#ifndef T1_CONFIG_OPTION_NO_AFM
+  FT_CALLBACK_TABLE
+  const AFM_Parser_FuncsRec  afm_parser_funcs;
+#endif
+
+  FT_CALLBACK_TABLE
+  const T1_CMap_ClassesRec  t1_cmap_classes;
+
+  FT_CALLBACK_TABLE
+  const CFF_Decoder_FuncsRec  cff_decoder_funcs;
+
 
   FT_EXPORT_VAR( const FT_Module_Class )  psaux_driver_class;
 
 
+  FT_DECLARE_MODULE( psaux_module_class )
+
+
 FT_END_HEADER
 
 #endif /* PSAUXMOD_H_ */
diff --git a/src/pshinter/pshmod.c b/src/pshinter/pshmod.c
index 801bf92..e0abd38 100644
--- a/src/pshinter/pshmod.c
+++ b/src/pshinter/pshmod.c
@@ -19,6 +19,7 @@
 #include <freetype/internal/ftobjs.h>
 #include "pshrec.h"
 #include "pshalgo.h"
+#include "pshmod.h"
 
 
   /* the Postscript Hinter module structure */
diff --git a/src/sfnt/sfwoff2.c b/src/sfnt/sfwoff2.c
index 781b932..895d6cf 100644
--- a/src/sfnt/sfwoff2.c
+++ b/src/sfnt/sfwoff2.c
@@ -43,7 +43,8 @@
 
 #define READ_BASE128( var )    FT_SET_ERROR( ReadBase128( stream, &var ) )
 
-#define ROUND4( var )          ( ( var + 3 ) & ~3 )
+  /* `var' should be FT_ULong */
+#define ROUND4( var )          ( ( var + 3 ) & ~3UL )
 
 #define WRITE_USHORT( p, v )                \
           do                                \
@@ -63,12 +64,12 @@
                                              \
           } while ( 0 )
 
-#define WRITE_SHORT( p, v )        \
-          do                       \
-          {                        \
-            *(p)++ = ( (v) >> 8 ); \
-            *(p)++ = ( (v) >> 0 ); \
-                                   \
+#define WRITE_SHORT( p, v )                 \
+          do                                \
+          {                                 \
+            *(p)++ = (FT_Byte)( (v) >> 8 ); \
+            *(p)++ = (FT_Byte)( (v) >> 0 ); \
+                                            \
           } while ( 0 )
 
 #define WRITE_SFNT_BUF( buf, s ) \
@@ -280,12 +281,12 @@
 
 
   /* Calculate table checksum of `buf'. */
-  static FT_Long
+  static FT_ULong
   compute_ULong_sum( FT_Byte*  buf,
                      FT_ULong  size )
   {
     FT_ULong  checksum     = 0;
-    FT_ULong  aligned_size = size & ~3;
+    FT_ULong  aligned_size = size & ~3UL;
     FT_ULong  i;
     FT_ULong  v;
 
@@ -536,12 +537,12 @@
                 FT_ULong*          glyph_size )
   {
     FT_UInt   flag_offset  = 10 + ( 2 * n_contours ) + 2 + instruction_len;
-    FT_Int    last_flag    = -1;
-    FT_Int    repeat_count =  0;
-    FT_Int    last_x       =  0;
-    FT_Int    last_y       =  0;
-    FT_UInt   x_bytes      =  0;
-    FT_UInt   y_bytes      =  0;
+    FT_Byte   last_flag    = 0xFFU;
+    FT_Byte   repeat_count = 0;
+    FT_Int    last_x       = 0;
+    FT_Int    last_y       = 0;
+    FT_UInt   x_bytes      = 0;
+    FT_UInt   y_bytes      = 0;
     FT_UInt   xy_bytes;
     FT_UInt   i;
     FT_UInt   x_offset;
@@ -553,9 +554,9 @@
     {
       const WOFF2_PointRec  point = points[i];
 
-      FT_Int  flag = point.on_curve ? GLYF_ON_CURVE : 0;
-      FT_Int  dx   = point.x - last_x;
-      FT_Int  dy   = point.y - last_y;
+      FT_Byte  flag = point.on_curve ? GLYF_ON_CURVE : 0;
+      FT_Int   dx   = point.x - last_x;
+      FT_Int   dy   = point.y - last_y;
 
 
       if ( dx == 0 )
@@ -632,7 +633,7 @@
       if ( dx == 0 )
         ;
       else if ( dx > -256 && dx < 256 )
-        dst[x_offset++] = FT_ABS( dx );
+        dst[x_offset++] = (FT_Byte)FT_ABS( dx );
       else
       {
         pointer = dst + x_offset;
@@ -645,7 +646,7 @@
       if ( dy == 0 )
         ;
       else if ( dy > -256 && dy < 256 )
-        dst[y_offset++] = FT_ABS( dy );
+        dst[y_offset++] = (FT_Byte)FT_ABS( dy );
       else
       {
         pointer = dst + y_offset;
@@ -917,7 +918,7 @@
     bbox_bitmap_offset = substreams[BBOX_STREAM].offset;
 
     /* Size of bboxBitmap = 4 * floor((numGlyphs + 31) / 32) */
-    bitmap_length                   = ( ( num_glyphs + 31 ) >> 5 ) << 2;
+    bitmap_length                   = ( ( num_glyphs + 31U ) >> 5 ) << 2;
     substreams[BBOX_STREAM].offset += bitmap_length;
 
     glyph_buf_size = WOFF2_DEFAULT_GLYPH_BUF;
@@ -1195,7 +1196,7 @@
 
       /* Store x_mins, may be required to reconstruct `hmtx'. */
       if ( n_contours > 0 )
-        info->x_mins[i] = x_min;
+        info->x_mins[i] = (FT_Short)x_min;
     }
 
     info->glyf_table->dst_length = dest_offset - info->glyf_table->dst_offset;
@@ -1343,7 +1344,7 @@
       if ( FT_STREAM_SEEK( glyf_offset ) || FT_STREAM_SKIP( 2 ) )
         return error;
 
-      if ( FT_READ_USHORT( info->x_mins[i] ) )
+      if ( FT_READ_SHORT( info->x_mins[i] ) )
         return error;
     }
 
diff --git a/src/sfnt/ttcmap.c b/src/sfnt/ttcmap.c
index e54baf9..556a712 100644
--- a/src/sfnt/ttcmap.c
+++ b/src/sfnt/ttcmap.c
@@ -3751,6 +3751,7 @@
 
   static const TT_CMap_Class  tt_cmap_classes[] =
   {
+#undef  TTCMAPCITEM
 #define TTCMAPCITEM( a )  &a,
 #include "ttcmapc.h"
     NULL,
diff --git a/src/sfnt/ttcmap.h b/src/sfnt/ttcmap.h
index 428ad21..c7d7c21 100644
--- a/src/sfnt/ttcmap.h
+++ b/src/sfnt/ttcmap.h
@@ -90,6 +90,11 @@
   };
 
 
+#undef  TTCMAPCITEM
+#define TTCMAPCITEM( a )  FT_CALLBACK_TABLE  const TT_CMap_ClassRec  a;
+#include "ttcmapc.h"
+
+
   typedef struct  TT_ValidatorRec_
   {
     FT_ValidatorRec  validator;
diff --git a/src/smooth/ftsmooth.c b/src/smooth/ftsmooth.c
index b326292..3ce1cea 100644
--- a/src/smooth/ftsmooth.c
+++ b/src/smooth/ftsmooth.c
@@ -358,8 +358,8 @@
       cover = ( spans->coverage + SCALE * SCALE / 2 ) / ( SCALE * SCALE );
       for ( x = 0; x < spans->len; x++ )
       {
-        sum = dst[ ( spans->x + x ) / SCALE ] + cover;
-        dst[ ( spans->x + x ) / SCALE ] = sum - ( sum >> 8 );
+        sum                           = dst[( spans->x + x ) / SCALE] + cover;
+        dst[( spans->x + x ) / SCALE] = (unsigned char)( sum - ( sum >> 8 ) );
       }
     }
   }
diff --git a/src/truetype/ttinterp.c b/src/truetype/ttinterp.c
index 6aecfb4..41b174e 100644
--- a/src/truetype/ttinterp.c
+++ b/src/truetype/ttinterp.c
@@ -6081,7 +6081,7 @@
         exc->zp0.org[point].x = TT_MulFix14( distance,
                                              exc->GS.freeVector.x );
       exc->zp0.org[point].y = TT_MulFix14( distance,
-                                           exc->GS.freeVector.y ),
+                                           exc->GS.freeVector.y );
       exc->zp0.cur[point]   = exc->zp0.org[point];
     }
 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY