diff options
Diffstat (limited to 'Modules/CheckSymbolExists.cmake')
| -rw-r--r-- | Modules/CheckSymbolExists.cmake | 72 |
1 files changed, 61 insertions, 11 deletions
diff --git a/Modules/CheckSymbolExists.cmake b/Modules/CheckSymbolExists.cmake index 6f1afcfda..105338301 100644 --- a/Modules/CheckSymbolExists.cmake +++ b/Modules/CheckSymbolExists.cmake @@ -10,7 +10,7 @@ or macro in ``C``. .. command:: check_symbol_exists - :: + .. code-block:: cmake check_symbol_exists(<symbol> <files> <variable>) @@ -32,31 +32,57 @@ The following variables may be set before calling this macro to modify the way the check is run: ``CMAKE_REQUIRED_FLAGS`` - string of compile command line flags + string of compile command line flags. ``CMAKE_REQUIRED_DEFINITIONS`` - list of macros to define (-DFOO=bar) + a :ref:`;-list <CMake Language Lists>` of macros to define (-DFOO=bar). ``CMAKE_REQUIRED_INCLUDES`` - list of include directories + a :ref:`;-list <CMake Language Lists>` of header search paths to pass to + the compiler. +``CMAKE_REQUIRED_LINK_OPTIONS`` + a :ref:`;-list <CMake Language Lists>` of options to add to the link command. ``CMAKE_REQUIRED_LIBRARIES`` - list of libraries to link + a :ref:`;-list <CMake Language Lists>` of libraries to add to the link + command. See policy :policy:`CMP0075`. ``CMAKE_REQUIRED_QUIET`` - execute quietly without messages + execute quietly without messages. + +For example: + +.. code-block:: cmake + + include(CheckSymbolExists) + + # Check for macro SEEK_SET + check_symbol_exists(SEEK_SET "stdio.h" HAVE_SEEK_SET) + # Check for function fopen + check_symbol_exists(fopen "stdio.h" HAVE_FOPEN) #]=======================================================================] +include_guard(GLOBAL) + +cmake_policy(PUSH) +cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced + macro(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE) if(CMAKE_C_COMPILER_LOADED) - _CHECK_SYMBOL_EXISTS("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" "${SYMBOL}" "${FILES}" "${VARIABLE}" ) + __CHECK_SYMBOL_EXISTS_IMPL("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" "${SYMBOL}" "${FILES}" "${VARIABLE}" ) elseif(CMAKE_CXX_COMPILER_LOADED) - _CHECK_SYMBOL_EXISTS("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.cxx" "${SYMBOL}" "${FILES}" "${VARIABLE}" ) + __CHECK_SYMBOL_EXISTS_IMPL("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.cxx" "${SYMBOL}" "${FILES}" "${VARIABLE}" ) else() message(FATAL_ERROR "CHECK_SYMBOL_EXISTS needs either C or CXX language enabled") endif() endmacro() -macro(_CHECK_SYMBOL_EXISTS SOURCEFILE SYMBOL FILES VARIABLE) +macro(__CHECK_SYMBOL_EXISTS_IMPL SOURCEFILE SYMBOL FILES VARIABLE) if(NOT DEFINED "${VARIABLE}" OR "x${${VARIABLE}}" STREQUAL "x${VARIABLE}") set(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n") set(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS}) + if(CMAKE_REQUIRED_LINK_OPTIONS) + set(CHECK_SYMBOL_EXISTS_LINK_OPTIONS + LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS}) + else() + set(CHECK_SYMBOL_EXISTS_LINK_OPTIONS) + endif() if(CMAKE_REQUIRED_LIBRARIES) set(CHECK_SYMBOL_EXISTS_LIBS LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}) @@ -73,8 +99,28 @@ macro(_CHECK_SYMBOL_EXISTS SOURCEFILE SYMBOL FILES VARIABLE) string(APPEND CMAKE_CONFIGURABLE_FILE_CONTENT "#include <${FILE}>\n") endforeach() - string(APPEND CMAKE_CONFIGURABLE_FILE_CONTENT - "\nint main(int argc, char** argv)\n{\n (void)argv;\n#ifndef ${SYMBOL}\n return ((int*)(&${SYMBOL}))[argc];\n#else\n (void)argc;\n return 0;\n#endif\n}\n") + string(APPEND CMAKE_CONFIGURABLE_FILE_CONTENT " +int main(int argc, char** argv) +{ + (void)argv;") + set(_CSE_CHECK_NON_MACRO "return ((int*)(&${SYMBOL}))[argc];") + if("${SYMBOL}" MATCHES "^[a-zA-Z_][a-zA-Z0-9_]*$") + # The SYMBOL has a legal macro name. Test whether it exists as a macro. + string(APPEND CMAKE_CONFIGURABLE_FILE_CONTENT " +#ifndef ${SYMBOL} + ${_CSE_CHECK_NON_MACRO} +#else + (void)argc; + return 0; +#endif") + else() + # The SYMBOL cannot be a macro (e.g., a template function). + string(APPEND CMAKE_CONFIGURABLE_FILE_CONTENT " + ${_CSE_CHECK_NON_MACRO}") + endif() + string(APPEND CMAKE_CONFIGURABLE_FILE_CONTENT " +}") + unset(_CSE_CHECK_NON_MACRO) configure_file("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in" "${SOURCEFILE}" @ONLY) @@ -86,6 +132,7 @@ macro(_CHECK_SYMBOL_EXISTS SOURCEFILE SYMBOL FILES VARIABLE) ${CMAKE_BINARY_DIR} "${SOURCEFILE}" COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} + ${CHECK_SYMBOL_EXISTS_LINK_OPTIONS} ${CHECK_SYMBOL_EXISTS_LIBS} CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS} @@ -112,5 +159,8 @@ macro(_CHECK_SYMBOL_EXISTS SOURCEFILE SYMBOL FILES VARIABLE) "${OUTPUT}\nFile ${SOURCEFILE}:\n" "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n") endif() + unset(CMAKE_CONFIGURABLE_FILE_CONTENT) endif() endmacro() + +cmake_policy(POP) |