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