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--- cmake/os/DragonFly.cmake.orig 2016-04-14 10:16:17 UTC
+++ cmake/os/DragonFly.cmake
@@ -0,0 +1,24 @@
+INCLUDE(CheckCSourceRuns)
+
+# We require at least GCC 4.4 or Clang 3.3.
+IF(NOT FORCE_UNSUPPORTED_COMPILER)
+ IF(CMAKE_COMPILER_IS_GNUCC)
+ EXECUTE_PROCESS(COMMAND ${CMAKE_C_COMPILER} -dumpversion
+ OUTPUT_VARIABLE GCC_VERSION)
+ IF(GCC_VERSION VERSION_LESS 4.4)
+ MESSAGE(FATAL_ERROR "GCC 4.4 or newer is required!")
+ ENDIF()
+ ELSEIF(CMAKE_C_COMPILER_ID MATCHES "Clang")
+ CHECK_C_SOURCE_RUNS("
+ int main()
+ {
+ return (__clang_major__ < 3) ||
+ (__clang_major__ == 3 && __clang_minor__ < 3);
+ }" HAVE_SUPPORTED_CLANG_VERSION)
+ IF(NOT HAVE_SUPPORTED_CLANG_VERSION)
+ MESSAGE(FATAL_ERROR "Clang 3.3 or newer is required!")
+ ENDIF()
+ ELSE()
+ MESSAGE(FATAL_ERROR "Unsupported compiler!")
+ ENDIF()
+ENDIF()
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