blob: f1d39bdd37410279e2157b00a103ea41df3699b0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file LICENSE.rst 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> <headers> <variable>
[LANGUAGE <language>])
Check that the struct or class ``<struct>`` has the specified ``<member>``
after including the given header(s) ``<headers>`` where the prototype should
be declared. Specify the list of header files in one argument as a
semicolon-separated list. The result is stored in an internal cache variable
``<variable>``.
The options are:
``LANGUAGE <language>``
Use the ``<language>`` compiler to perform the check.
Acceptable values are ``C`` and ``CXX``.
If not specified, it defaults to ``C``.
The following variables may be set before calling this macro to modify
the way the check is run:
.. include:: /module/CMAKE_REQUIRED_FLAGS.txt
.. include:: /module/CMAKE_REQUIRED_DEFINITIONS.txt
.. include:: /module/CMAKE_REQUIRED_INCLUDES.txt
.. include:: /module/CMAKE_REQUIRED_LINK_OPTIONS.txt
.. include:: /module/CMAKE_REQUIRED_LIBRARIES.txt
.. include:: /module/CMAKE_REQUIRED_LINK_DIRECTORIES.txt
.. include:: /module/CMAKE_REQUIRED_QUIET.txt
Example
^^^^^^^
.. code-block:: cmake
include(CheckStructHasMember)
check_struct_has_member("struct timeval" tv_sec sys/select.h
HAVE_TIMEVAL_TV_SEC LANGUAGE C)
#]=======================================================================]
include_guard(GLOBAL)
include(CheckSourceCompiles)
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 "
${_INCLUDE_FILES}
int main(void)
{
(void)sizeof(((${_STRUCT} *)0)->${_MEMBER});
return 0;
}
")
if("${_lang}" STREQUAL "C")
check_source_compiles(C "${_CHECK_STRUCT_MEMBER_SOURCE_CODE}" ${_RESULT})
elseif("${_lang}" STREQUAL "CXX")
check_source_compiles(CXX "${_CHECK_STRUCT_MEMBER_SOURCE_CODE}" ${_RESULT})
else()
message(FATAL_ERROR "Unknown language:\n ${_lang}\nSupported languages: C, CXX.\n")
endif()
endmacro ()
# FIXME(#24994): The following modules are included only for compatibility
# with projects that accidentally relied on them with CMake 3.26 and below.
include(CheckCSourceCompiles)
include(CheckCXXSourceCompiles)
|
