[PATCH] Don't build 32-bit libatomic with -march=i486 on x86-64

[H.J. Lu]

Gcc uses the same -march= for both -m32 and -m64 on x86-64 unless
--with-arch-32= is used.  There is no need for -march=i486 to compile
32-bit libatomic on x86-64.

Tested on x86-64.  OK for trunk?

H.J.
---
        PR target/70454
        * configure.tgt (XCFLAGS): Don't add -march=i486 to compile
        32-bit x86 target library on x86-64.
---
 libatomic/configure.tgt | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/libatomic/configure.tgt b/libatomic/configure.tgt
index c5470d7..bbb93fc 100644
--- a/libatomic/configure.tgt
+++ b/libatomic/configure.tgt
@@ -81,14 +81,8 @@ case "${target_cpu}" in
        try_ifunc=yes
        ;;
   x86_64)
-       case " ${CC} ${CFLAGS} " in
-         *" -m32 "*)
-           XCFLAGS="${XCFLAGS} -march=i486 -mtune=generic"
-           XCFLAGS="${XCFLAGS} -fomit-frame-pointer"
-           ;;
-         *)
-           ;;
-       esac
+       # Since 64-bit arch > i486, we can use the same -march= to build
+       # both 32-bit and 64-bit target libraries.
        ARCH=x86
        # ??? Detect when -mcx16 is already enabled.
        try_ifunc=yes
-- 
2.5.5