CheckSourceRuns

New in version 3.19.

Check if given source compiles and links into an executable and can subsequently be run.

check_source_runs

check_source_runs(<lang> <code> <resultVar>
                  [SRC_EXT <extension>])

Check that the source supplied in <code> can be compiled as a source file for the requested language, linked as an executable and then run. If the <code> could be built and run successfully, the internal cache variable specified by <resultVar> will be set to 1, otherwise it will be set to a value that evaluates to boolean false (e.g. an empty string or an error message).

By default, the test source file will be given a file extension that matches the requested language. The SRC_EXT option can be used to override this with .<extension> instead.

The <code> must contain a valid main program. For example:

check_source_runs(C
"#include <stdlib.h>
#include <stdnoreturn.h>
noreturn void f(){ exit(0); }
int main(void) { f(); return 1; }"
HAVE_NORETURN)

check_source_runs(Fortran
"program test
real :: x[*]
call co_sum(x)
end program"
HAVE_COARRAY)

The underlying check is performed by the try_run() command. The compile and link commands can be influenced by setting any of the following variables prior to calling check_source_runs():

CMAKE_REQUIRED_FLAGS

Additional flags to pass to the compiler. Note that the contents of CMAKE_<LANG>_FLAGS and its associated configuration-specific variable are automatically added to the compiler command before the contents of CMAKE_REQUIRED_FLAGS.

CMAKE_REQUIRED_DEFINITIONS

A ;-list of compiler definitions of the form -DFOO or -DFOO=bar. A definition for the name specified by <resultVar> will also be added automatically.

CMAKE_REQUIRED_INCLUDES

A ;-list of header search paths to pass to the compiler. These will be the only header search paths used by try_run(), i.e. the contents of the INCLUDE_DIRECTORIES directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

A ;-list of options to add to the link command (see try_run() for further details).

CMAKE_REQUIRED_LIBRARIES

A ;-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_run() for further details).

CMAKE_REQUIRED_QUIET

If this variable evaluates to a boolean true value, all status messages associated with the check will be suppressed.

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.