- ## We need a decent support of the c++11 standard
- include(CheckCXXCompilerFlag)
- CHECK_CXX_COMPILER_FLAG("-std=gnu++11" COMPILER_SUPPORTS_CXX11)
- if(COMPILER_SUPPORTS_CXX11)
- set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
- else()
- message(FATAL_ERROR
- "The compiler ${CMAKE_CXX_COMPILER} (v${CMAKE_CXX_COMPILER_VERSION}) has no C++11 support. "
- "Please use a decent C++ compiler.")
- endif()
+## We need a decent support of the c++11 standard
+include(CheckCXXCompilerFlag)
+CHECK_CXX_COMPILER_FLAG("-std=gnu++11" COMPILER_SUPPORTS_CXX11)
+if(COMPILER_SUPPORTS_CXX11)
+ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
+else()
+ message(FATAL_ERROR
+ "The compiler ${CMAKE_CXX_COMPILER} (v${CMAKE_CXX_COMPILER_VERSION}) has no C++11 support. "
+ "Please use a decent C++ compiler.")
+endif()
+
+### And we need C11 standard, too
+include(CheckCCompilerFlag)
+CHECK_C_COMPILER_FLAG("-std=gnu11" COMPILER_SUPPORTS_C11)
+if(COMPILER_SUPPORTS_C11)
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11")
+else()
+ message(FATAL_ERROR
+ "The compiler ${CMAKE_C_COMPILER} (v${CMAKE_C_COMPILER_VERSION}) has no C11 support. "
+ "Please use a decent C compiler "
+ "(note that c++11 support of ${CMAKE_CXX_COMPILER} seems ok).")
+endif()
+if(APPLE AND (CMAKE_C_COMPILER_VERSION VERSION_LESS "4.6"))
+ ### gcc 4.[1-5] cannot compile ucontext on OSX
+ message(STATUS "Ucontext can't be used with this version of gcc (must be greater than 4.5)")
+ set(HAVE_UCONTEXT_H 0)
+endif()