Move configure logic for internal GNU regex usage to its own file

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@6003 ea778897-0a13-0410-b9d1-a72fbfd435f5

ChangeLog

@@ -2,7 +2,8 @@
 
  * autogen.sh, configure.ac:
    Modernize configure.ac a bit.
- * configure.ac, m4/geany-revision.m4, m4/geany-binreloc.m4:
+ * configure.ac, m4/geany-revision.m4, m4/geany-binreloc.m4,
+   m4/geany-gnu-regex.m4:
    Extract some configure logic to separate files for better
    readability.
 

configure.ac

@@ -92,23 +92,7 @@ fi
 
 
 # check whether to use included GNU regex library
-AC_ARG_ENABLE([gnu-regex],
-		[AS_HELP_STRING([--enable-gnu-regex],
-				[compile with included GNU regex library [default=no]])],
-		,
-		[enable_gnu_regex=no])
-
-# auto-enable included regex if necessary
-# FIXME: this may override a user choice
-AC_CHECK_FUNCS([regcomp], [], [enable_gnu_regex="yes"])
-
-if test "x$enable_gnu_regex" = "xyes" ; then
-	AC_DEFINE([USE_INCLUDED_REGEX], [1], [Define if included GNU regex code should be used.])
-	AC_DEFINE([HAVE_REGCOMP], [1], [Define if you have the 'regcomp' function.])
-	AM_CONDITIONAL([USE_INCLUDED_REGEX], true)
-else
-	AM_CONDITIONAL([USE_INCLUDED_REGEX], false)
-fi
+GEANY_CHECK_GNU_REGEX
 
 
 # check for mingw specific settings

m4/geany-gnu-regex.m4

+dnl GEANY_CHECK_GNU_REGEX
+dnl Checks whether to use internal GNU regex library
+dnl Defines USE_INCLUDED_REGEX both with AC_DEFINE and as an
+dnl AM_CONDITIONAL
+AC_DEFUN([GEANY_CHECK_GNU_REGEX],
+[
+	AC_ARG_ENABLE([gnu-regex],
+			[AS_HELP_STRING([--enable-gnu-regex],
+					[compile with included GNU regex library [default=no]])],
+			,
+			[enable_gnu_regex=no])
+
+	# auto-enable included regex if necessary
+	# FIXME: this may override a user choice
+	AC_CHECK_FUNCS([regcomp], [], [enable_gnu_regex="yes"])
+
+	if test "x$enable_gnu_regex" = "xyes" ; then
+		AC_DEFINE([USE_INCLUDED_REGEX], [1], [Define if included GNU regex code should be used.])
+		AC_DEFINE([HAVE_REGCOMP], [1], [Define if you have the 'regcomp' function.])
+		AM_CONDITIONAL([USE_INCLUDED_REGEX], true)
+	else
+		AM_CONDITIONAL([USE_INCLUDED_REGEX], false)
+	fi
+])