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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/95413] [11 regression] i686-linux
 --enable-targets=all cannot configure m64 libgomp
Date: Fri, 29 May 2020 17:51:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95413

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
I am testing this:

diff --git a/config/cet.m4 b/config/cet.m4
index 2bb2c8a95ac..911fbd46475 100644
--- a/config/cet.m4
+++ b/config/cet.m4
@@ -7,13 +7,14 @@ GCC_ENABLE(cet, auto, ,[enable Intel CET in target
libraries],
           permit yes|no|auto)
 AC_MSG_CHECKING([for CET support])

+# NB: Avoid nested save_CFLAGS and save_LDFLAGS.
 case "$host" in
   i[[34567]]86-*-linux* | x86_64-*-linux*)
     case "$enable_cet" in
       auto)
        # Check if target supports multi-byte NOPs
        # and if assembler supports CET insn.
-       save_CFLAGS=3D"$CFLAGS"
+       cet_save_CFLAGS=3D"$CFLAGS"
        CFLAGS=3D"$CFLAGS -fcf-protection"
        AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM(
@@ -27,7 +28,7 @@ asm ("setssbsy");
          ])],
         [enable_cet=3Dyes],
         [enable_cet=3Dno])
-       CFLAGS=3D"$save_CFLAGS"
+       CFLAGS=3D"$cet_save_CFLAGS"
        ;;
       yes)
        # Check if assembler supports CET.
@@ -64,7 +65,7 @@ AC_MSG_CHECKING([for CET support])
 case "$host" in
   i[[34567]]86-*-linux* | x86_64-*-linux*)
     may_have_cet=3Dyes
-    save_CFLAGS=3D"$CFLAGS"
+    cet_save_CFLAGS=3D"$CFLAGS"
     CFLAGS=3D"$CFLAGS -fcf-protection"
     case "$enable_cet" in
       auto)
@@ -93,7 +94,7 @@ asm ("setssbsy");
         [AC_MSG_ERROR([assembler with CET support is required for
--enable-cet])])
        ;;
     esac
-    CFLAGS=3D"$save_CFLAGS"
+    CFLAGS=3D"$cet_save_CFLAGS"
     ;;
   *)
     may_have_cet=3Dno
@@ -101,9 +102,9 @@ asm ("setssbsy");
     ;;
 esac

-save_CFLAGS=3D"$CFLAGS"
+cet_save_CFLAGS=3D"$CFLAGS"
 CFLAGS=3D"$CFLAGS -fcf-protection=3Dnone"
-save_LDFLAGS=3D"$LDFLAGS"
+cet_save_LDFLAGS=3D"$LDFLAGS"
 LDFLAGS=3D"$LDFLAGS -Wl,-z,ibt,-z,shstk"
 if test x$may_have_cet =3D xyes; then
   # Check whether -fcf-protection=3Dnone -Wl,-z,ibt,-z,shstk work.
@@ -159,6 +160,6 @@ if test x$enable_cet =3D xyes; then
 else
   AC_MSG_RESULT([no])
 fi
-CFLAGS=3D"$save_CFLAGS"
-LDFLAGS=3D"$save_LDFLAGS"
+CFLAGS=3D"$cet_save_CFLAGS"
+LDFLAGS=3D"$cet_save_LDFLAGS"
 ])=