Merge topic 'gcc-features'

37ed860a GNU C++: record that -fvisibility-inlines-hidden is available since 4.0
94a8ee6f GNU C: record that C99 is available since at least 3.4
940bf6a4 Tests/Module/WCDH: only use -Werror=undef compiler flag if actually supported
f26ca5a1 Tests/Module/WCDH: write multi_file_compiler_detection.h before using it

3 files changed, 10 insertions, 11 deletions

diff --git a/Modules/Compiler/GNU-C-FeatureTests.cmake b/Modules/Compiler/GNU-C-FeatureTests.cmake
index b3fe33f14f..0ab5265a58 100644
--- a/Modules/Compiler/GNU-C-FeatureTests.cmake
+++ b/Modules/Compiler/GNU-C-FeatureTests.cmake
@@ -1,5 +1,5 @@
 
-set(_cmake_oldestSupported "(__GNUC__ * 100 + __GNUC_MINOR__) >= 404")
+set(_cmake_oldestSupported "(__GNUC__ * 100 + __GNUC_MINOR__) >= 304")
 
 # GNU 4.7 correctly sets __STDC_VERSION__ to 201112L, but GNU 4.6 sets it
 # to 201000L.  As the former is strictly greater than the latter, test only
@@ -8,10 +8,10 @@ set(_cmake_oldestSupported "(__GNUC__ * 100 + __GNUC_MINOR__) >= 404")
 # to the distinction between __cplusplus and __GXX_EXPERIMENTAL_CXX0X__ tests.
 set(GNU46_C11 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 406 && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201000L")
 set(_cmake_feature_test_c_static_assert "${GNU46_C11}")
-# Since 4.4 at least:
-set(GNU44_C99 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 404 && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L")
-set(_cmake_feature_test_c_restrict "${GNU44_C99}")
-set(_cmake_feature_test_c_variadic_macros "${GNU44_C99}")
+# Since 3.4 at least:
+set(GNU34_C99 "(__GNUC__ * 100 + __GNUC_MINOR__) >= 304 && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L")
+set(_cmake_feature_test_c_restrict "${GNU34_C99}")
+set(_cmake_feature_test_c_variadic_macros "${GNU34_C99}")
 
 set(GNU_C90 "${_cmake_oldestSupported}")
 set(_cmake_feature_test_c_function_prototypes "${GNU_C90}")
diff --git a/Modules/Compiler/GNU-C.cmake b/Modules/Compiler/GNU-C.cmake
index 05c3bb2b43..3f026182b8 100644
--- a/Modules/Compiler/GNU-C.cmake
+++ b/Modules/Compiler/GNU-C.cmake
@@ -4,12 +4,12 @@ __compiler_gnu(C)
 if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.5)
   set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
   set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")
-elseif (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.4)
+elseif (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
   set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c89")
   set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu89")
 endif()
 
-if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.4)
+if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
   set(CMAKE_C99_STANDARD_COMPILE_OPTION "-std=c99")
   set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
 endif()
@@ -22,7 +22,7 @@ elseif (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.6)
   set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu1x")
 endif()
 
-if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.4)
+if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
   if (NOT CMAKE_C_COMPILER_FORCED)
     if (NOT CMAKE_C_STANDARD_COMPUTED_DEFAULT)
       message(FATAL_ERROR "CMAKE_C_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_C_COMPILER_ID} (${CMAKE_C_COMPILER}) version ${CMAKE_C_COMPILER_VERSION}")
@@ -38,10 +38,9 @@ if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.4)
   endif()
 endif()
 
-
 macro(cmake_record_c_compile_features)
   set(_result 0)
-  if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.4)
+  if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
     if(_result EQUAL 0 AND CMAKE_C11_STANDARD_COMPILE_OPTION)
       _record_compiler_features_c(11)
     endif()
diff --git a/Modules/Compiler/GNU-CXX.cmake b/Modules/Compiler/GNU-CXX.cmake
index b04ea112c6..c007c9837b 100644
--- a/Modules/Compiler/GNU-CXX.cmake
+++ b/Modules/Compiler/GNU-CXX.cmake
@@ -6,7 +6,7 @@ if (WIN32)
     set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fno-keep-inline-dllexport")
   endif()
 else()
-  if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.2)
+  if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.0)
     set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
   endif()
 endif()