82 lines
2.4 KiB
CMake
82 lines
2.4 KiB
CMake
# 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
|
|
|
|
.. 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 "
|
|
${_INCLUDE_FILES}
|
|
int main()
|
|
{
|
|
(void)sizeof(((${_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()
|
|
endmacro ()
|