diff options
Diffstat (limited to 'Modules/CheckStructHasMember.cmake')
| -rw-r--r-- | Modules/CheckStructHasMember.cmake | 126 |
1 files changed, 67 insertions, 59 deletions
diff --git a/Modules/CheckStructHasMember.cmake b/Modules/CheckStructHasMember.cmake index 085b46492..842a8fdb7 100644 --- a/Modules/CheckStructHasMember.cmake +++ b/Modules/CheckStructHasMember.cmake @@ -1,74 +1,82 @@ # Distributed under the OSI-approved BSD 3-Clause License. See accompanying # file Copyright.txt or https://cmake.org/licensing for details. -#.rst: -# CheckStructHasMember -# -------------------- -# -# Check if the given struct or class has the specified member variable -# -# :: -# -# CHECK_STRUCT_HAS_MEMBER(<struct> <member> <header> <variable> -# [LANGUAGE <language>]) -# -# :: -# -# <struct> - the name of the struct or class you are interested in -# <member> - the member which existence you want to check -# <header> - the header(s) where the prototype should be declared -# <variable> - variable to store the result -# <language> - the compiler to use (C or CXX) -# -# -# -# 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 -# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) -# CMAKE_REQUIRED_INCLUDES = list of include directories -# CMAKE_REQUIRED_LIBRARIES = list of libraries to link -# CMAKE_REQUIRED_QUIET = execute quietly without messages -# -# -# -# Example: CHECK_STRUCT_HAS_MEMBER("struct timeval" tv_sec sys/select.h -# HAVE_TIMEVAL_TV_SEC LANGUAGE C) +#[=======================================================================[.rst: +CheckStructHasMember +-------------------- +Check if the given struct or class has the specified member variable + +.. command:: CHECK_STRUCT_HAS_MEMBER + + .. code-block:: cmake + + CHECK_STRUCT_HAS_MEMBER(<struct> <member> <header> <variable> + [LANGUAGE <language>]) + + :: + + <struct> - the name of the struct or class you are interested in + <member> - the member which existence you want to check + <header> - the header(s) where the prototype should be declared + <variable> - variable to store the result + <language> - the compiler to use (C or CXX) + + + +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 + CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) + CMAKE_REQUIRED_INCLUDES = list of include directories + CMAKE_REQUIRED_LINK_OPTIONS = list of options to pass to link command + CMAKE_REQUIRED_LIBRARIES = list of libraries to link + CMAKE_REQUIRED_QUIET = execute quietly without messages + + +Example: + +.. code-block:: cmake + + CHECK_STRUCT_HAS_MEMBER("struct timeval" tv_sec sys/select.h + HAVE_TIMEVAL_TV_SEC LANGUAGE C) +#]=======================================================================] + +include_guard(GLOBAL) include(CheckCSourceCompiles) include(CheckCXXSourceCompiles) macro (CHECK_STRUCT_HAS_MEMBER _STRUCT _MEMBER _HEADER _RESULT) - set(_INCLUDE_FILES) - foreach (it ${_HEADER}) - string(APPEND _INCLUDE_FILES "#include <${it}>\n") - endforeach () - - if("x${ARGN}" STREQUAL "x") - set(_lang C) - elseif("x${ARGN}" MATCHES "^xLANGUAGE;([a-zA-Z]+)$") - set(_lang "${CMAKE_MATCH_1}") - else() - message(FATAL_ERROR "Unknown arguments:\n ${ARGN}\n") - endif() - - set(_CHECK_STRUCT_MEMBER_SOURCE_CODE " + set(_INCLUDE_FILES) + foreach (it ${_HEADER}) + string(APPEND _INCLUDE_FILES "#include <${it}>\n") + endforeach () + + if("x${ARGN}" STREQUAL "x") + set(_lang C) + elseif("x${ARGN}" MATCHES "^xLANGUAGE;([a-zA-Z]+)$") + set(_lang "${CMAKE_MATCH_1}") + else() + message(FATAL_ERROR "Unknown arguments:\n ${ARGN}\n") + endif() + + set(_CHECK_STRUCT_MEMBER_SOURCE_CODE " ${_INCLUDE_FILES} int main() { - (void)sizeof(((${_STRUCT} *)0)->${_MEMBER}); - return 0; + (void)sizeof(((${_STRUCT} *)0)->${_MEMBER}); + return 0; } ") - if("${_lang}" STREQUAL "C") - CHECK_C_SOURCE_COMPILES("${_CHECK_STRUCT_MEMBER_SOURCE_CODE}" ${_RESULT}) - elseif("${_lang}" STREQUAL "CXX") - CHECK_CXX_SOURCE_COMPILES("${_CHECK_STRUCT_MEMBER_SOURCE_CODE}" ${_RESULT}) - else() - message(FATAL_ERROR "Unknown language:\n ${_lang}\nSupported languages: C, CXX.\n") - endif() + if("${_lang}" STREQUAL "C") + CHECK_C_SOURCE_COMPILES("${_CHECK_STRUCT_MEMBER_SOURCE_CODE}" ${_RESULT}) + elseif("${_lang}" STREQUAL "CXX") + CHECK_CXX_SOURCE_COMPILES("${_CHECK_STRUCT_MEMBER_SOURCE_CODE}" ${_RESULT}) + else() + message(FATAL_ERROR "Unknown language:\n ${_lang}\nSupported languages: C, CXX.\n") + endif() endmacro () |