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authorMarc Chevrier <marc.chevrier@gmail.com>2018-11-26 17:32:06 +0100
committerMarc Chevrier <marc.chevrier@gmail.com>2018-12-01 17:56:23 +0100
commitf266182aecb687f0c20c7fa7019ad0dde3222f46 (patch)
tree329ec6152a0290856004f3ac263c71acc740a4b3 /Modules/CheckTypeSize.cmake
parent29f9db5c63dbfa53acdb449fad78d716a4113a88 (diff)
downloadcmake-f266182aecb687f0c20c7fa7019ad0dde3222f46.tar.gz
Check* functions family: add support for LINK_OPTIONS
Fixes: #18521
Diffstat (limited to 'Modules/CheckTypeSize.cmake')
-rw-r--r--Modules/CheckTypeSize.cmake64
1 files changed, 34 insertions, 30 deletions
diff --git a/Modules/CheckTypeSize.cmake b/Modules/CheckTypeSize.cmake
index 2c53df9012..3727373071 100644
--- a/Modules/CheckTypeSize.cmake
+++ b/Modules/CheckTypeSize.cmake
@@ -7,50 +7,52 @@ CheckTypeSize
Check sizeof a type
-::
+.. command:: CHECK_TYPE_SIZE
- CHECK_TYPE_SIZE(TYPE VARIABLE [BUILTIN_TYPES_ONLY]
- [LANGUAGE <language>])
+ .. code-block:: cmake
-Check if the type exists and determine its size. On return,
-"HAVE_${VARIABLE}" holds the existence of the type, and "${VARIABLE}"
-holds one of the following:
+ CHECK_TYPE_SIZE(TYPE VARIABLE [BUILTIN_TYPES_ONLY]
+ [LANGUAGE <language>])
-::
+ Check if the type exists and determine its size. On return,
+ ``HAVE_${VARIABLE}`` holds the existence of the type, and ``${VARIABLE}``
+ holds one of the following:
- <size> = type has non-zero size <size>
- "0" = type has arch-dependent size (see below)
- "" = type does not exist
+ ::
-Both ``HAVE_${VARIABLE}`` and ``${VARIABLE}`` will be created as internal
-cache variables.
+ <size> = type has non-zero size <size>
+ "0" = type has arch-dependent size (see below)
+ "" = type does not exist
-Furthermore, the variable "${VARIABLE}_CODE" holds C preprocessor code
-to define the macro "${VARIABLE}" to the size of the type, or leave
-the macro undefined if the type does not exist.
+ Both ``HAVE_${VARIABLE}`` and ``${VARIABLE}`` will be created as internal
+ cache variables.
-The variable "${VARIABLE}" may be "0" when CMAKE_OSX_ARCHITECTURES has
-multiple architectures for building OS X universal binaries. This
-indicates that the type size varies across architectures. In this
-case "${VARIABLE}_CODE" contains C preprocessor tests mapping from
-each architecture macro to the corresponding type size. The list of
-architecture macros is stored in "${VARIABLE}_KEYS", and the value for
-each key is stored in "${VARIABLE}-${KEY}".
+ Furthermore, the variable ``${VARIABLE}_CODE`` holds C preprocessor code
+ to define the macro ``${VARIABLE}`` to the size of the type, or leave
+ the macro undefined if the type does not exist.
-If the BUILTIN_TYPES_ONLY option is not given, the macro checks for
-headers <sys/types.h>, <stdint.h>, and <stddef.h>, and saves results
-in HAVE_SYS_TYPES_H, HAVE_STDINT_H, and HAVE_STDDEF_H. The type size
-check automatically includes the available headers, thus supporting
-checks of types defined in the headers.
+ The variable ``${VARIABLE}`` may be ``0`` when
+ :variable:`CMAKE_OSX_ARCHITECTURES` has multiple architectures for building
+ OS X universal binaries. This indicates that the type size varies across
+ architectures. In this case ``${VARIABLE}_CODE`` contains C preprocessor
+ tests mapping from each architecture macro to the corresponding type size.
+ The list of architecture macros is stored in ``${VARIABLE}_KEYS``, and the
+ value for each key is stored in ``${VARIABLE}-${KEY}``.
-If LANGUAGE is set, the specified compiler will be used to perform the
-check. Acceptable values are C and CXX
+ If the ``BUILTIN_TYPES_ONLY`` option is not given, the macro checks for
+ headers ``<sys/types.h>``, ``<stdint.h>``, and ``<stddef.h>``, and saves
+ results in ``HAVE_SYS_TYPES_H``, ``HAVE_STDINT_H``, and ``HAVE_STDDEF_H``.
+ The type size check automatically includes the available headers, thus
+ supporting checks of types defined in the headers.
+
+ If ``LANGUAGE`` is set, the specified compiler will be used to perform the
+ check. Acceptable values are ``C`` and ``CXX``.
Despite the name of the macro you may use it to check the size of more
complex expressions, too. To check e.g. for the size of a struct
member you can do something like this:
-::
+.. code-block:: cmake
check_type_size("((struct something*)0)->member" SIZEOF_MEMBER)
@@ -64,6 +66,7 @@ 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
CMAKE_EXTRA_INCLUDE_FILES = list of extra headers to include
@@ -116,6 +119,7 @@ function(__check_type_size_impl type var map builtin language)
configure_file(${__check_type_size_dir}/CheckTypeSize.c.in ${src} @ONLY)
try_compile(HAVE_${var} ${CMAKE_BINARY_DIR} ${src}
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
+ LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS}
LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES}
CMAKE_FLAGS
"-DCOMPILE_DEFINITIONS:STRING=${CMAKE_REQUIRED_FLAGS}"