52 lines
1.8 KiB
CMake
52 lines
1.8 KiB
CMake
# This test will verify if CheckSymbolExists only report symbols available
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# for linking that really are. You can find some documentation on this in
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# bug 11333 where we found out that gcc would optimize out the actual
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# reference to the symbol, so symbols that are in fact _not_ available in the
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# given libraries (but seen in header) were reported as present.
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#
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# If you change this test do not forget to change the CheckCXXSymbolExists
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# test, too.
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project(CheckSymbolExists C)
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cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
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set(CMAKE_REQUIRED_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}")
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include(CheckSymbolExists)
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foreach(_config_type Release RelWithDebInfo MinSizeRel Debug)
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set(CMAKE_TRY_COMPILE_CONFIGURATION ${_config_type})
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unset(CSE_RESULT_${_config_type} CACHE)
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message(STATUS "Testing configuration ${_config_type}")
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check_symbol_exists(non_existent_function_for_symbol_test "cm_cse.h" CSE_RESULT_${_config_type})
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if (CSE_RESULT_${_config_type})
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message(SEND_ERROR "CheckSymbolExists reported a nonexistent symbol as existing in configuration ${_config_type}")
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endif ()
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endforeach()
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set(CMAKE_TRY_COMPILE_CONFIGURATION ${CMAKE_BUILD_TYPE})
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unset(CSE_RESULT_ERRNO CACHE)
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check_symbol_exists(errno "errno.h" CSE_RESULT_ERRNO)
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if (NOT CSE_RESULT_ERRNO)
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message(SEND_ERROR "CheckSymbolExists did not find errno in <errno.h>")
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else ()
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message(STATUS "errno found as expected")
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endif ()
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if (CMAKE_COMPILER_IS_GNUCC)
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string(APPEND CMAKE_C_FLAGS " -O3")
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unset(CSE_RESULT_O3 CACHE)
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message(STATUS "Testing with optimization -O3")
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check_symbol_exists(non_existent_function_for_symbol_test "cm_cse.h" CSE_RESULT_O3)
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if (CSE_RESULT_O3)
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message(SEND_ERROR "CheckSymbolExists reported a nonexistent symbol as existing with optimization -O3")
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endif ()
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endif ()
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