diff mbox series

[2/3] Build x86 libgomp with -march=i486 or better

Message ID 20210114210431.463242-3-hjl.tools@gmail.com
State New
Headers show
Series Build x86 libitm/libgomp/libatomic with -march=i486 or better | expand

Commit Message

H.J. Lu Jan. 14, 2021, 9:04 p.m. UTC 
If x86 libgomp isn't compiled with -march=i486 or better, append
-march=i486 XCFLAGS for x86 libgomp build.

	PR target/70454
	* configure.tgt (XCFLAGS): Append -march=i486 to compile x86
	libgomp if needed.
---
 libgomp/configure.tgt | 36 ++++++++++++++++--------------------
 1 file changed, 16 insertions(+), 20 deletions(-)
diff mbox series

Patch

diff --git a/libgomp/configure.tgt b/libgomp/configure.tgt
index 1863287fa0d..83b5f92727d 100644
--- a/libgomp/configure.tgt
+++ b/libgomp/configure.tgt
@@ -73,28 +73,24 @@  if test x$enable_linux_futex = xyes; then
 	;;
 
     # Note that bare i386 is not included here.  We need cmpxchg.
-    i[456]86-*-linux*)
+    i[456]86-*-linux* | x86_64-*-linux*)
 	config_path="linux/x86 linux posix"
-	case " ${CC} ${CFLAGS} " in
-	  *" -m64 "*|*" -mx32 "*)
-	    ;;
-	  *)
-	    if test -z "$with_arch"; then
-	      XCFLAGS="${XCFLAGS} -march=i486 -mtune=${target_cpu}"
+	# Need i486 or better.
+	cat > conftestx.c <<EOF
+#if defined __x86_64__ || defined __i486__ || defined __pentium__ \
+      || defined __pentiumpro__ || defined __pentium4__ \
+      || defined __geode__ || defined __SSE__
+# error Need i486 or better
+#endif
+EOF
+	if ${CC} ${CFLAGS} -c -o conftestx.o conftestx.c > /dev/null 2>&1; then
+	    if test "${target_cpu}" = x86_64; then
+		XCFLAGS="${XCFLAGS} -march=i486 -mtune=generic"
+	    else
+		XCFLAGS="${XCFLAGS} -march=i486 -mtune=${target_cpu}"
 	    fi
-	esac
-	;;
-
-    # Similar jiggery-pokery for x86_64 multilibs, except here we
-    # can't rely on the --with-arch configure option, since that
-    # applies to the 64-bit side.
-    x86_64-*-linux*)
-	config_path="linux/x86 linux posix"
-	case " ${CC} ${CFLAGS} " in
-	  *" -m32 "*)
-	    XCFLAGS="${XCFLAGS} -march=i486 -mtune=generic"
-	    ;;
-	esac
+	fi
+	rm -f conftestx.c conftestx.o
 	;;
 
     # Note that sparcv7 and sparcv8 is not included here.  We need cas.