include(RunCMake) # Detect the compiler in use in the current environment. run_cmake(FindCompiler) include(${RunCMake_BINARY_DIR}/FindCompiler-build/cc.cmake) if(NOT CMAKE_C_COMPILER) message(FATAL_ERROR "FindCompiler provided no compiler!") endif() if(NOT IS_ABSOLUTE "${CMAKE_C_COMPILER}") message(FATAL_ERROR "FindCompiler provided non-absolute path \"${CMAKE_C_COMPILER}\"!") endif() if(NOT EXISTS "${CMAKE_C_COMPILER}") message(FATAL_ERROR "FindCompiler provided non-existing path \"${CMAKE_C_COMPILER}\"!") endif() # Now that we have the full compiler path, hide CC. unset(ENV{CC}) # Wrap around the real compiler so we can change the compiler # path without changing the underlying compiler. set(ccIn ${RunCMake_SOURCE_DIR}/cc.sh.in) set(cc1 ${RunCMake_BINARY_DIR}/cc1.sh) set(cc2 ${RunCMake_BINARY_DIR}/cc2.sh) set(cc3 CMAKE_C_COMPILER-NOTFOUND) configure_file(${ccIn} ${cc1} @ONLY) configure_file(${ccIn} ${cc2} @ONLY) # Use a single build tree for remaining tests without cleaning. set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/ChangeCompiler-build) set(RunCMake_TEST_NO_CLEAN 1) file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}") # Check build with compiler wrapper 1. set(RunCMake_TEST_OPTIONS -DCMAKE_C_COMPILER=${cc1}) set(ENV{RunCMake_TEST} "FirstCompiler") run_cmake(FirstCompiler) include(${RunCMake_TEST_BINARY_DIR}/cc.cmake) if(NOT "${CMAKE_C_COMPILER}" STREQUAL "${cc1}") message(FATAL_ERROR "FirstCompiler built with compiler:\n ${CMAKE_C_COMPILER}\nand not with:\n ${cc1}") endif() # Check rebuild with compiler wrapper 2. set(RunCMake_TEST_OPTIONS -DCMAKE_C_COMPILER=${cc2}) set(ENV{RunCMake_TEST} "SecondCompiler") run_cmake(SecondCompiler) include(${RunCMake_TEST_BINARY_DIR}/cc.cmake) if(NOT "${CMAKE_C_COMPILER}" STREQUAL "${cc2}") message(FATAL_ERROR "SecondCompiler built with compiler:\n ${CMAKE_C_COMPILER}\nand not with:\n ${cc2}") endif() # Check failure with an empty compiler string. set(RunCMake_TEST_OPTIONS -DCMAKE_C_COMPILER=) set(ENV{RunCMake_TEST} "EmptyCompiler") run_cmake(EmptyCompiler) include(${RunCMake_TEST_BINARY_DIR}/cc.cmake) if(NOT "${CMAKE_C_COMPILER}" STREQUAL "${cc3}") message(FATAL_ERROR "Empty built with compiler:\n ${CMAKE_C_COMPILER}\nand not with:\n ${cc3}") endif()