On 26/08/11 10:25, Alexis Moinet wrote :
> I think it would be useful to have cmake add this option only if supported or
> if gcc > 4.3
here is a little patch that should fix the problem (should work with cmake
2.6.4 and later):
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23068d8..03a331b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,6 +24,7 @@ set(CMAKE_COLOR_MAKEFILE ON)
# Include cmake modules
include(CheckIncludeFiles)
include(CheckLibraryExists)
+include(CheckCCompilerFlag)
include(FindPkgConfig)
include(TestBigEndian)
@@ -53,7 +54,12 @@ endif()
# Compiler-specific flags
if(CMAKE_COMPILER_IS_GNUCC)
- set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wno-unused-but-set-variable")
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
+ CHECK_C_COMPILER_FLAG("-Wno-unused-but-set-variable"
COMPILER_SUPPORTS_WNO_UNUSED_BUT_SET_VARIABLE)
+ if(COMPILER_SUPPORTS_WNO_UNUSED_BUT_SET_VARIABLE)
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}
-Wno-unused-but-set-variable")
+ endif()
+
if(CMAKE_BUILD_TYPE STREQUAL "Release")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2")
endif()
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