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cmake: Check if C++ compiler can compile ObjectiveC sources.

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rtokarev committed May 11, 2011
1 parent 19a4707 commit 65a207bc497c591b834f8b91f90da8300b7b8432
Showing with 33 additions and 0 deletions.
  1. +33 −0 CMakeLists.txt
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@@ -10,6 +10,39 @@ find_program(GIT git)
find_program(RAGEL ragel)
find_program(CONFETTI confetti)
+
+#
+# Check if CXX compiler can compile ObjectiveC sources.
+# The code was borrowed from CMakeTestCXXCompiler.cmake
+#
+IF(NOT CMAKE_CXX_OBJECTIVEC_COMPILER_WORKS)
+ MESSAGE(STATUS "Check for working CXX (ObjectiveC) compiler: ${CMAKE_CXX_COMPILER}")
+ FILE(WRITE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCXXObjectiveCCompiler.m
+ "int main(){return 0;}\n")
+ TRY_COMPILE(CMAKE_CXX_OBJECTIVEC_COMPILER_WORKS ${CMAKE_BINARY_DIR}
+ ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCXXObjectiveCCompiler.m
+ OUTPUT_VARIABLE OUTPUT)
+ SET(CXX_OBJECTIVEC_TEST_WAS_RUN 1)
+ENDIF(NOT CMAKE_CXX_OBJECTIVEC_COMPILER_WORKS)
+IF(NOT CMAKE_CXX_OBJECTIVEC_COMPILER_WORKS)
+ MESSAGE(STATUS "Check for working CXX (ObjectiveC) compiler: ${CMAKE_CXX_COMPILER} -- broken")
+ FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+ "Determining if the CXX (ObjectiveC) compiler works failed with "
+ "the following output:\n${OUTPUT}\n\n")
+ MESSAGE(FATAL_ERROR "The C++ compiler \"${CMAKE_CXX_COMPILER}\" "
+ "is not able to compile a simple ObjectiveC test program.\nIt fails "
+ "with the following output:\n ${OUTPUT}\n\n"
+ "CMake will not be able to correctly generate this project.")
+ELSE(NOT CMAKE_CXX_OBJECTIVEC_COMPILER_WORKS)
+ IF(CXX_OBJECTIVEC_TEST_WAS_RUN)
+ MESSAGE(STATUS "Check for working CXX (ObjectiveC) compiler: ${CMAKE_CXX_COMPILER} -- works")
+ FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+ "Determining if the CXX (ObjectiveC) compiler works passed with "
+ "the following output:\n${OUTPUT}\n\n")
+ ENDIF(CXX_OBJECTIVEC_TEST_WAS_RUN)
+ SET(CMAKE_CXX_OBJETIVEC_COMPILER_WORKS 1 CACHE INTERNAL "")
+ENDIF(NOT CMAKE_CXX_OBJECTIVEC_COMPILER_WORKS)
+
#
# This instructs the rest of the build system what product
# and what modules to produce.

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