Introduce and use config/gcc-version.m4.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@91625 138bc75d-0d04-0410-961f-82ee72b054a4

ChangeLog

@@ -1,3 +1,9 @@
+2004-12-02  Richard Sandiford  <rsandifo@redhat.com>
+
+	* configure.in: Include config/gcc-version.m4.  Use TL_AC_GCC_VERSION
+	to set gcc_version_trigger.  Remove some now-redundant AC_SUBSTs.
+	* configure: Regenerate.
+
 2004-12-01  Eric Christopher  <echristo@redhat.com>
 
 	* Makefile.in (clean-target-libgcc): Add stmp-dirs to list

config/ChangeLog

@@ -1,3 +1,7 @@
+2004-12-02  Richard Sandiford  <rsandifo@redhat.com>
+
+	* config/gcc-version.m4: New file.
+
 2004-09-24  Zack Weinberg  <zack@codesourcery.com>
 
 	* warnings.m4: New file.

config/gcc-version.m4

@@ -0,0 +1,28 @@
+dnl Usage: TL_AC_GCC_VERSION(TOPSRCDIR)
+dnl
+dnl Set up the variables:
+dnl
+dnl     gcc_version_trigger: pathname of gcc's version.c, if available
+dnl     gcc_version_full: full gcc version string
+dnl     gcc_version: the first "word" in $gcc_version_full
+dnl
+dnl TOPSRCDIR is the top-level source directory.
+AC_DEFUN([TL_AC_GCC_VERSION],
+[
+changequote(,)dnl
+if test "${with_gcc_version_trigger+set}" = set; then
+  gcc_version_trigger=$with_gcc_version_trigger
+else
+  gcc_version_trigger=$1/gcc/version.c
+fi
+if test -f "${gcc_version_trigger}"; then
+  gcc_version_full=`grep version_string "${gcc_version_trigger}" | sed -e 's/.*"\([^"]*\)".*/\1/'`
+else
+  gcc_version_full=`$CC -v 2>&1 | sed -n 's/^gcc version //p'`
+fi
+gcc_version=`echo ${gcc_version_full} | sed -e 's/\([^ ]*\) .*/\1/'`
+changequote([,])dnl
+AC_SUBST(gcc_version_trigger)
+AC_SUBST(gcc_version_full)
+AC_SUBST(gcc_version)
+])dnl