configure: test not just compiling but linking with -march/-mtune

pcc wrongly passes any option beginning with -m to the linker, and
will break at link time if these options were added to CFLAGS. testing
linking lets us catch this at configure time and skip them.

diff --git a/configure b/configure
index c1bcac7..327734a 100755 (executable)
--- a/configure
+++ b/configure
@@ -269,8 +269,8 @@ tryflag CFLAGS_AUTO -falign-jumps=1
 # work anyway (issues with atomic ops).
 #
 if test "$ARCH" = "i386" ; then
 # work anyway (issues with atomic ops).
 #
 if test "$ARCH" = "i386" ; then

-fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryflag CFLAGS_AUTO -march=i486
-fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryflag CFLAGS_AUTO -mtune=generic
+fnmatch '-march=*|*\ -march=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -march=i486
+fnmatch '-mtune=*|*\ -mtune=*' "$CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic

 fi
 
 if test "x$warnings" = xyes ; then
 fi
 
 if test "x$warnings" = xyes ; then