CheckCSourceCompiles¶
Check if given C source compiles and links into an executable.
- check_c_source_compiles¶
check_c_source_compiles(<code> <resultVar> [FAIL_REGEX <regex1> [<regex2>...]])
Check that the source supplied in
<code>can be compiled as a C source file and linked as an executable (so it must contain at least amain()function). The result will be stored in the internal cache variable specified by<resultVar>, with a boolean true value for success and boolean false for failure. IfFAIL_REGEXis provided, then failure is determined by checking if anything in the output matches any of the specified regular expressions.The check is only performed once, with the result cached in the variable named by
<resultVar>. Every subsequent CMake run will re-use this cached value rather than performing the check again, even if the<code>changes. In order to force the check to be re-evaluated, the variable named by<resultVar>must be manually removed from the cache.The compile and link commands can be influenced by setting any of the following variables prior to calling
check_c_source_compiles():
CMAKE_REQUIRED_FLAGSString of additional flags to pass to the compiler. The string must be space-delimited--a ;-list will not work. The contents of
CMAKE_<LANG>_FLAGSand its associated configuration-specific variable are automatically added to the compiler command before the contents ofCMAKE_REQUIRED_FLAGS.
CMAKE_REQUIRED_DEFINITIONSA ;-list of compiler definitions of the form
-DFOOor-DFOO=bar. A definition for the name specified by<resultVar>will also be added automatically.
CMAKE_REQUIRED_INCLUDESA ;-list of header search paths to pass to the compiler. These will be the only header search paths used--the contents of the
INCLUDE_DIRECTORIESdirectory property will be ignored.
CMAKE_REQUIRED_LINK_OPTIONSNew in version 3.14.
A ;-list of options to add to the link command (see
try_compile()for further details).
CMAKE_REQUIRED_LIBRARIESA ;-list of libraries to add to the link command. These can be the name of system libraries or they can be Imported Targets (see
try_compile()for further details).
CMAKE_REQUIRED_QUIETNew in version 3.1.
If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.