CheckStructHasMember

Check if the given struct or class has the specified member variable

check_struct_has_member

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:

CMAKE_REQUIRED_FLAGS

String of additional flags to pass to the compiler. The string must be space-delimited--a ;-list will not work. 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--the contents of the INCLUDE_DIRECTORIES directory property will be ignored.

CMAKE_REQUIRED_LINK_OPTIONS

Added in version 3.14.

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

CMAKE_REQUIRED_LINK_DIRECTORIES

Added in version 3.31.

A ;-list of libraries search paths to pass to the linker (see try_compile() for further details).

CMAKE_REQUIRED_QUIET

Added in version 3.1.

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

Example

include(CheckStructHasMember)

check_struct_has_member("struct timeval" tv_sec sys/select.h
                        HAVE_TIMEVAL_TV_SEC LANGUAGE C)