gmt-fork/cmake/modules/FindREGEX.cmake

#
# $Id$
#
# - Find regex
# Find the native REGEX includes and library
#
#  REGEX_INCLUDE_DIR   - where to find regex.h, etc.
#  REGEX_LIBRARY       - List of libraries when using regex.
#  REGEX_FOUND         - True if regex found.
#
# - Locate a C-style regex library
# This module defines
#  REGEX_LIBRARY, the library to link against, if needed
#  REGEX_FOUND, if false, do not try to link to regex
#  REGEX_INCLUDE_DIR, where to find regex.h
#

set (REGEX_FOUND "NO")
include (CheckCSourceCompiles)
set (REGEX_LIBRARY)
find_path (REGEX_INCLUDE_DIR
	NAMES regex.h
	PATH_SUFFIXES include include/awk
	PATHS
	$ENV{REGEXDIR}
	/usr
	/sw
	/opt/local
	/opt/csw
	/opt
	/usr/local
)

#try compiling, even if not found
check_c_source_compiles ("int main() {(void)regcomp();}" REGCOMP_IN_LIBC)

if (REGEX_INCLUDE_DIR)
	if (NOT REGCOMP_IN_LIBC)
		# we need to link some library
		find_library (REGEX_LIBRARY_TEMP
			NAMES regex
			PATH_SUFFIXES lib
			PATHS
			$ENV{REGEXDIR}
			/usr
			/sw
			/opt/local
			/opt/csw
			/opt
			/usr/local
		)
		if (REGEX_LIBRARY_TEMP)
			set (CMAKE_REQUIRED_LIBRARIES ${REGEX_LIBRARY_TEMP})
			check_c_source_compiles ("int main() {(void)regcomp();}" REGCOMP_IN_REGEX)

			if (REGCOMP_IN_REGEX)
				set (REGEX_LIBRARY ${REGEX_LIBRARY_TEMP})
				set (REGEX_FOUND "YES")
			else (REGCOMP_IN_REGEX)
				message ("I found regex.h and a libregex but couldn't get regcomp() to compile")
			endif (REGCOMP_IN_REGEX)

		else (REGEX_LIBRARY_TEMP)
			message ("I found regex.h but regcomp() is not in libc or libregex")
		endif (REGEX_LIBRARY_TEMP)

	else (NOT REGCOMP_IN_LIBC)
		set (REGEX_FOUND "YES")
	endif (NOT REGCOMP_IN_LIBC)
else (REGEX_INCLUDE_DIR)
	if (REGCOMP_IN_LIBC)
		message ("regcomp() exists in libc, but I can't locate regex.h")
	endif (REGCOMP_IN_LIBC)
endif (REGEX_INCLUDE_DIR)

mark_as_advanced (REGEX_LIBRARY_TEMP REGCOMP_IN_LIBC REGCOMP_IN_REGEX)

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