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From: Fangrui Song <maskray@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/maskray/clang] x86_64: Improve configure to catch incomplete Clang support
Date: Thu,  7 Oct 2021 20:14:04 +0000 (GMT)	[thread overview]
Message-ID: <20211007201404.6E9F93857C7E@sourceware.org> (raw)

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


             reply	other threads:[~2021-10-07 20:14 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-07 20:14 Fangrui Song [this message]
2021-10-08  1:44 Fangrui Song
2021-10-10 23:12 Fangrui Song

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