[cmake] Support enabling -Werror in the OpenMP runtime CMake build and

clean up the build.

This disables all of the Clang warnings that fire for me when building
libomp.so on Linux with a recent Clang binary. Lots of these should
probably be fixed, but I want to at least get the build warning-clean
and make it easy to keep that way.

I also switched a bunch of the warnings that are used both for C and C++
compiles to check the flag with C compilation test.

Differential Revision: http://reviews.llvm.org/D11253

llvm-svn: 242604

2 files changed, 35 insertions, 7 deletions

diff --git a/openmp/runtime/cmake/LibompHandleFlags.cmake b/openmp/runtime/cmake/LibompHandleFlags.cmake
index 4e3d96efec7..570ce5c68f2 100644
--- a/openmp/runtime/cmake/LibompHandleFlags.cmake
+++ b/openmp/runtime/cmake/LibompHandleFlags.cmake
@@ -28,10 +28,25 @@ function(libomp_get_c_and_cxxflags_common flags)
   set(flags_local)
   libomp_append(flags_local -std=c++11 LIBOMP_HAVE_STD_CPP11_FLAG)
   libomp_append(flags_local -fno-exceptions LIBOMP_HAVE_FNO_EXCEPTIONS_FLAG)
-  libomp_append(flags_local -Wsign-compare LIBOMP_HAVE_WSIGN_COMPARE_FLAG)
+  if(${LIBOMP_ENABLE_WERROR})
+    libomp_append(flags_local -Werror LIBOMP_HAVE_WERROR_FLAG)
+  endif()
+  libomp_append(flags_local -Wno-sign-compare LIBOMP_HAVE_WNO_SIGN_COMPARE_FLAG)
+  libomp_append(flags_local -Wno-unused-function LIBOMP_HAVE_WNO_UNUSED_FUNCTION_FLAG)
+  libomp_append(flags_local -Wno-unused-local-typedef LIBOMP_HAVE_WNO_UNUSED_LOCAL_TYPEDEF_FLAG)
   libomp_append(flags_local -Wno-unused-value LIBOMP_HAVE_WNO_UNUSED_VALUE_FLAG)
+  libomp_append(flags_local -Wno-unused-variable LIBOMP_HAVE_WNO_UNUSED_VARIABLE_FLAG)
   libomp_append(flags_local -Wno-switch LIBOMP_HAVE_WNO_SWITCH_FLAG)
+  libomp_append(flags_local -Wno-covered-switch-default LIBOMP_HAVE_WNO_COVERED_SWITCH_DEFAULT_FLAG)
   libomp_append(flags_local -Wno-deprecated-register LIBOMP_HAVE_WNO_DEPRECATED_REGISTER_FLAG)
+  libomp_append(flags_local -Wno-gnu-anonymous-struct LIBOMP_HAVE_WNO_GNU_ANONYMOUS_STRUCT_FLAG)
+  libomp_append(flags_local -Wno-unknown-pragmas LIBOMP_HAVE_WNO_UNKNOWN_PRAGMAS_FLAG)
+  libomp_append(flags_local -Wno-missing-field-initializers LIBOMP_HAVE_WNO_MISSING_FIELD_INITIALIZERS_FLAG)
+  libomp_append(flags_local -Wno-missing-braces LIBOMP_HAVE_WNO_MISSING_BRACES_FLAG)
+  libomp_append(flags_local -Wno-comment LIBOMP_HAVE_WNO_COMMENT_FLAG)
+  libomp_append(flags_local -Wno-self-assign LIBOMP_HAVE_WNO_SELF_ASSIGN_FLAG)
+  libomp_append(flags_local -Wno-vla-extension LIBOMP_HAVE_WNO_VLA_EXTENSION_FLAG)
+  libomp_append(flags_local -Wno-format-pedantic LIBOMP_HAVE_WNO_FORMAT_PEDANTIC_FLAG)
   libomp_append(flags_local /GS LIBOMP_HAVE_GS_FLAG)
   libomp_append(flags_local /EHsc LIBOMP_HAVE_EHSC_FLAG)
   libomp_append(flags_local /Oy- LIBOMP_HAVE_OY__FLAG)
diff --git a/openmp/runtime/cmake/config-ix.cmake b/openmp/runtime/cmake/config-ix.cmake
index bd798d6070b..875b5519a26 100644
--- a/openmp/runtime/cmake/config-ix.cmake
+++ b/openmp/runtime/cmake/config-ix.cmake
@@ -48,12 +48,25 @@ endfunction()
 check_cxx_compiler_flag(-std=c++11 LIBOMP_HAVE_STD_CPP11_FLAG)
 check_cxx_compiler_flag(-fno-exceptions LIBOMP_HAVE_FNO_EXCEPTIONS_FLAG)
 check_c_compiler_flag("-x c++" LIBOMP_HAVE_X_CPP_FLAG)
-check_cxx_compiler_flag(-Wunused-value LIBOMP_HAVE_WNO_UNUSED_VALUE_FLAG)
-check_cxx_compiler_flag(-Wswitch LIBOMP_HAVE_WNO_SWITCH_FLAG)
-check_cxx_compiler_flag(-Wdeprecated-register LIBOMP_HAVE_WNO_DEPRECATED_REGISTER_FLAG)
-check_cxx_compiler_flag(-Wsign-compare LIBOMP_HAVE_WSIGN_COMPARE_FLAG)
-check_cxx_compiler_flag(-msse2 LIBOMP_HAVE_MSSE2_FLAG)
-check_cxx_compiler_flag(-ftls-model=initial-exec LIBOMP_HAVE_FTLS_MODEL_FLAG)
+check_c_compiler_flag(-Werror LIBOMP_HAVE_WERROR_FLAG)
+check_c_compiler_flag(-Wunused-function LIBOMP_HAVE_WNO_UNUSED_FUNCTION_FLAG)
+check_c_compiler_flag(-Wunused-local-typedef LIBOMP_HAVE_WNO_UNUSED_LOCAL_TYPEDEF_FLAG)
+check_c_compiler_flag(-Wunused-value LIBOMP_HAVE_WNO_UNUSED_VALUE_FLAG)
+check_c_compiler_flag(-Wunused-variable LIBOMP_HAVE_WNO_UNUSED_VARIABLE_FLAG)
+check_c_compiler_flag(-Wswitch LIBOMP_HAVE_WNO_SWITCH_FLAG)
+check_c_compiler_flag(-Wcovered-switch-default LIBOMP_HAVE_WNO_COVERED_SWITCH_DEFAULT_FLAG)
+check_c_compiler_flag(-Wdeprecated-register LIBOMP_HAVE_WNO_DEPRECATED_REGISTER_FLAG)
+check_c_compiler_flag(-Wsign-compare LIBOMP_HAVE_WNO_SIGN_COMPARE_FLAG)
+check_c_compiler_flag(-Wgnu-anonymous-struct LIBOMP_HAVE_WNO_GNU_ANONYMOUS_STRUCT_FLAG)
+check_c_compiler_flag(-Wunknown-pragmas LIBOMP_HAVE_WNO_UNKNOWN_PRAGMAS_FLAG)
+check_c_compiler_flag(-Wmissing-field-initializers LIBOMP_HAVE_WNO_MISSING_FIELD_INITIALIZERS_FLAG)
+check_c_compiler_flag(-Wmissing-braces LIBOMP_HAVE_WNO_MISSING_BRACES_FLAG)
+check_c_compiler_flag(-Wcomment LIBOMP_HAVE_WNO_COMMENT_FLAG)
+check_c_compiler_flag(-Wself-assign LIBOMP_HAVE_WNO_SELF_ASSIGN_FLAG)
+check_c_compiler_flag(-Wvla-extension LIBOMP_HAVE_WNO_VLA_EXTENSION_FLAG)
+check_c_compiler_flag(-Wformat-pedantic LIBOMP_HAVE_WNO_FORMAT_PEDANTIC_FLAG)
+check_c_compiler_flag(-msse2 LIBOMP_HAVE_MSSE2_FLAG)
+check_c_compiler_flag(-ftls-model=initial-exec LIBOMP_HAVE_FTLS_MODEL_FLAG)
 libomp_check_architecture_flag(-mmic LIBOMP_HAVE_MMIC_FLAG)
 libomp_check_architecture_flag(-m32 LIBOMP_HAVE_M32_FLAG)
 if(WIN32)