From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <maskray@sourceware.org>
Received: by sourceware.org (Postfix, from userid 7814)
 id 6E9F93857C7E; Thu,  7 Oct 2021 20:14:04 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 6E9F93857C7E
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
From: Fangrui Song <maskray@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/maskray/clang] x86_64: Improve configure to catch incomplete
 Clang support
X-Act-Checkin: glibc
X-Git-Author: Fangrui Song <maskray@google.com>
X-Git-Refname: refs/heads/maskray/clang
X-Git-Oldrev: f208e0d7f71a0b776284c009ba4273fe7d8f1aaa
X-Git-Newrev: bd540e09ed18c3dc264c1922a5dcdea45d71af4b
Message-Id: <20211007201404.6E9F93857C7E@sourceware.org>
Date: Thu,  7 Oct 2021 20:14:04 +0000 (GMT)
X-BeenThere: glibc-cvs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Glibc-cvs mailing list <glibc-cvs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/glibc-cvs>,
 <mailto:glibc-cvs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/glibc-cvs/>
List-Help: <mailto:glibc-cvs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/glibc-cvs>,
 <mailto:glibc-cvs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Thu, 07 Oct 2021 20:14:04 -0000

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bd540e09ed18c3dc264c1922a5dcdea45d71af4b

commit bd540e09ed18c3dc264c1922a5dcdea45d71af4b
Author: Fangrui Song <maskray@google.com>
Date:   Sat Sep 25 23:36:15 2021 -0700

    x86_64: Improve configure to catch incomplete Clang support

Diff:
---
 sysdeps/x86_64/configure    | 2 ++
 sysdeps/x86_64/configure.ac | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/sysdeps/x86_64/configure b/sysdeps/x86_64/configure
index 585279f83d..c3145e6030 100755
--- a/sysdeps/x86_64/configure
+++ b/sysdeps/x86_64/configure
@@ -30,6 +30,8 @@ if ${libc_cv_asm_mpx+:} false; then :
 else
   cat > conftest.s <<\EOF
         bndmov %bnd0,(%rsp)
+        bnd
+        jmp *%r11
 EOF
 if { ac_try='${CC-cc} -c $ASFLAGS conftest.s 1>&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
diff --git a/sysdeps/x86_64/configure.ac b/sysdeps/x86_64/configure.ac
index 29e14033c0..3c935d66e1 100644
--- a/sysdeps/x86_64/configure.ac
+++ b/sysdeps/x86_64/configure.ac
@@ -14,6 +14,8 @@ dnl Check whether asm supports Intel MPX
 AC_CACHE_CHECK(for Intel MPX support, libc_cv_asm_mpx, [dnl
 cat > conftest.s <<\EOF
         bndmov %bnd0,(%rsp)
+        bnd
+        jmp *%r11
 EOF
 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
   libc_cv_asm_mpx=yes