gpu/khronos_glcts_support: WA suppress compile-time warnings on linux

Add various cflags/cflags_cc and disable clang chromium-style
enforcement on third_party/khronos_glcts sourcecode and support.

This is a workaround for various compile time warnings on desktop
linux (e.g. Ubuntu 12.04) that are treated as errors (i.e. by
-Werror).  The source of these warnings are from the
third_party/khronos_glcts sourcecode.  With these workarounds
the khronos_glcts_test is able to finish compilation.

The plan is to eventually fix the third-party code so we can
remove these workarounds.

BUG=chromium:412865
R=piman@chromium.org, kbr@chromium.org
TBR=piman@chromium.org
TEST=export GYP_DEFINES="internal_khronos_glcts_tests=1"
TEST=gclient runhooks
TEST=ninja -C out/Release khronos_glcts_test
TEST=./out/Release/khronos_glcts_test
TEST=ninja -C out/Debug khronos_glcts_test
TEST=./out/Debug/khronos_glcts_test
Signed-off-by: U. Artie Eoff <ullysses.a.eoff@intel.com>

Review URL: https://codereview.chromium.org/615063004

Cr-Commit-Position: refs/heads/master@{#297929}

gpu/khronos_glcts_support/khronos_glcts.gypi

@@ -32,6 +32,12 @@
     ],
   },
   'variables': {
+
+    # WA: Suppress [chromium-style] enforcement errors when compiled with
+    # clang.  The third_party/khronos_glcts sourcecode does not comply with
+    # the chromium-style standards.
+    'clang_use_chrome_plugins': 0,
+
     'glcts_data_dirs': [
       '<(DEPTH)/third_party/khronos_glcts/cts/data',
     ],

gpu/khronos_glcts_support/khronos_glcts_cts.gyp

@@ -10,6 +10,18 @@
     {
       'target_name': 'glcts_common',
       'type': 'static_library',
+      'conditions': [
+        ['OS=="linux"', {
+          'cflags_cc': [
+            # WA: Suppress "implicit conversion turns string literal into
+            # bool" compile warning from glcShaderIndexingTests.cpp,
+            # glcShaderLibraryCase.cpp and glcShaderLoopTests.cpp during
+            # Debug build
+            # TODO(uartie) fix.
+            '-Wno-string-conversion',
+          ],
+        }],
+      ],
       'dependencies': [
         '<(DEPTH)/gpu/khronos_glcts_support/khronos_glcts_framework.gyp:delibs',
         '<(DEPTH)/gpu/khronos_glcts_support/khronos_glcts_framework.gyp:tcutil',

gpu/khronos_glcts_support/khronos_glcts_framework.gyp

@@ -30,6 +30,16 @@
     {
       'target_name': 'debase',
       'type': 'static_library',
+      'conditions': [
+        ['OS=="linux"', {
+          'cflags': [
+            # WA: Suppress "implicit declaration of function '__assert_fail'
+            # is invalid in C99" warning from deDefs.c for Release compiles.
+            # TODO(uartie) fix.
+            '-Wno-implicit-function-declaration',
+          ],
+        }],
+      ],
       'direct_dependent_settings': {
         'include_dirs': [
           '<(DEPTH)/third_party/khronos_glcts/framework/delibs/debase',
@@ -131,6 +141,17 @@
     {
       'target_name': 'tcutil',
       'type': 'static_library',
+      'conditions': [
+        ['OS=="linux"', {
+          'cflags_cc': [
+            # WA: Suppress "cast to 'const unsigned char *' from smaller
+            # integer type 'deUint32' (aka 'unsigned int')" compile warning
+            # from tcuRandomValueIterator.hpp.
+            # TODO(uartie) fix.
+            '-Wno-int-to-pointer-cast',
+          ],
+        }],
+      ],
       'dependencies': [
         'delibs', 'qphelper',
         '<(DEPTH)/third_party/libpng/libpng.gyp:libpng',
@@ -188,6 +209,17 @@
     {
       'target_name': 'tcutil_egl',
       'type': 'static_library',
+      'conditions': [
+        ['OS=="linux"', {
+          'cflags_cc': [
+            # WA: Suppress "cast to 'void *' from smaller
+            # integer type 'glw::GLuint' (aka 'unsigned int')" compile
+            # warning from tcuEglPlatform.cpp.
+            # TODO(uartie) fix.
+            '-Wno-int-to-void-pointer-cast',
+          ],
+        }],
+      ],
       'dependencies': [
         'delibs', 'tcutil', 'glwrapper',
         # TODO: We may want to phase out the old gles2_conform support in preference

gpu/khronos_glcts_support/khronos_glcts_gtf.gyp

@@ -10,6 +10,38 @@
     {
       'target_name': 'gtf_es',
       'type': 'static_library',
+      'conditions': [
+        ['OS=="linux"', {
+          'cflags': [
+            # WA: Suppress "control reaches end of non-void function" compile
+            # warning from GTFTestDriver.c.
+            # TODO(uartie) fix.
+            '-Wno-return-type',
+
+            # WA: Suppress "incompatible pointer types passing to parameter"
+            # compile warning from GTFTestExtension.c.
+            # TODO(uartie) fix.
+            '-Wno-incompatible-pointer-types',
+
+            # WA: Suppress "passing 'GLint [15]' to parameter of type
+            # 'GLuint *' (aka 'unsigned int') converts between pointers to
+            # integer types with different sign" compile warning from
+            # GTFGL2TestGetAttachedObjects.c
+            # TODO(uartie) fix.
+            '-Wno-pointer-sign',
+
+            # WA: Suppress "comparison of unsigned expression >= 0 is always
+            # true" compile warning from GTFgl.c
+            # TODO(uartie) fix.
+            '-Wno-tautological-compare',
+
+            # WA: Suppress "equality comparison with extraneous parentheses"
+            # compile warning from GTFgl.c
+            # TODO(uartie) fix.
+            '-Wno-parentheses-equality',
+          ],
+        }],
+      ],
       'dependencies': [
         '<(DEPTH)/gpu/khronos_glcts_support/khronos_glcts_framework.gyp:debase',
         '<(DEPTH)/gpu/khronos_glcts_support/khronos_glcts_cts.gyp:glcts_gtf_wrapper',