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Kitware
GitHub Repository: Kitware/CMake
 Path: blob/master/Tests/CMakeOnly/CheckCXXSymbolExists/CMakeLists.txt
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# This test will verify if CheckCXXSymbolExists 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 CheckSymbolExists

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# test, too.

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cmake_minimum_required(VERSION 3.10)

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project(CheckCXXSymbolExists CXX)

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set(CMAKE_REQUIRED_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/../CheckSymbolExists")

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include(CheckCXXSymbolExists)

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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_cxx_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 "CheckCXXSymbolExists 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_CERRNO CACHE)

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message(STATUS "Checking <cerrno>")

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check_cxx_symbol_exists(errno "cerrno" CSE_RESULT_ERRNO_CERRNO)

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if (NOT CSE_RESULT_ERRNO_CERRNO)

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  unset(CSE_RESULT_ERRNO_ERRNOH CACHE)

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  message(STATUS "Checking <errno.h>")

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  check_cxx_symbol_exists(errno "errno.h" CSE_RESULT_ERRNO_ERRNOH)

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  if (NOT CSE_RESULT_ERRNO_ERRNOH)

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    message(SEND_ERROR "CheckCXXSymbolExists did not find errno in <cerrno> and <errno.h>")

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  else ()

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    message(STATUS "errno found in <errno.h>")

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  endif ()

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else ()

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  message(STATUS "errno found in <cerrno>")

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endif ()

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check_cxx_symbol_exists("std::fopen" "cstdio" CSE_RESULT_FOPEN)

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if (NOT CSE_RESULT_FOPEN)

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  if(NOT ("x${CMAKE_CXX_COMPILER_ID}" STREQUAL "xMSVC" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 13.10))

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    message(SEND_ERROR "CheckCXXSymbolExists did not find std::fopen in <cstdio>")

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  endif()

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else()

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  message(STATUS "std::fopen found in <cstdio>")

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endif()

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if (CMAKE_CXX_COMPILER_ID MATCHES "^(GNU|LCC)$")

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  string(APPEND CMAKE_CXX_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_cxx_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 "CheckCXXSymbolExists reported a nonexistent symbol as existing with optimization -O3")

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  endif ()

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endif ()

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check_cxx_symbol_exists("std::non_existent_function_for_symbol_test<int*>" "algorithm" CSE_RESULT_NON_SYMBOL)

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if (CSE_RESULT_NON_SYMBOL)

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  message(SEND_ERROR "CheckCXXSymbolExists reported a nonexistent symbol.")

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endif()

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