[gcc r12-8191] libstdc++: Fix syntax error in libbacktrace configuration

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:a2a7da1a055c98d9b4578151f273e0e7572aa605

commit r12-8191-ga2a7da1a055c98d9b4578151f273e0e7572aa605
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Apr 19 09:55:30 2022 +0100

    libstdc++: Fix syntax error in libbacktrace configuration
    
    Using == instead of = causes a configuration error with dash as the
    shell:
    
    checking whether to build libbacktrace support... /home/devel/building/work/src/gcc-12-20220417/libstdc++-v3/configure: 77471: test: auto: unexpected operator
    /home/devel/building/work/src/gcc-12-20220417/libstdc++-v3/configure: 77474: test: auto: unexpected operator
    auto
    
    This means we fail to change the value from "auto" to "no" and so this
    test passes:
    GLIBCXX_CONDITIONAL(ENABLE_BACKTRACE, [test "$enable_libstdcxx_backtrace" != no])
    
    This leads to the libbacktrace directory being included in the build
    without being configured properly, and bootstrap fails.
    
    libstdc++-v3/ChangeLog:
    
            * acinclude.m4 (GLIBCXX_ENABLE_BACKTRACE): Fix shell operators.
            * configure: Regenerate.

Diff:
---
 libstdc++-v3/acinclude.m4 | 6 +++---
 libstdc++-v3/configure    | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 6aece2adff8..138bd58d86c 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -5007,10 +5007,10 @@ esac
 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize"
 
   AC_MSG_CHECKING([whether to build libbacktrace support])
-  if test "$enable_libstdcxx_backtrace" == "auto"; then
+  if test "$enable_libstdcxx_backtrace" = "auto"; then
     enable_libstdcxx_backtrace=no
   fi
-  if test "$enable_libstdcxx_backtrace" == "yes"; then
+  if test "$enable_libstdcxx_backtrace" = "yes"; then
     BACKTRACE_SUPPORTED=1
 
     AC_CHECK_HEADERS(sys/mman.h)
@@ -5057,7 +5057,7 @@ BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize"
     BACKTRACE_SUPPORTS_THREADS=0
   fi
   AC_MSG_RESULT($enable_libstdcxx_backtrace)
-  GLIBCXX_CONDITIONAL(ENABLE_BACKTRACE, [test "$enable_libstdcxx_backtrace" != no])
+  GLIBCXX_CONDITIONAL(ENABLE_BACKTRACE, [test "$enable_libstdcxx_backtrace" = yes])
 ])
 
 # Macros from the top-level gcc directory.
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 7a0ac405331..9b94fd71e42 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -77468,10 +77468,10 @@ BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize"
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build libbacktrace support" >&5
 $as_echo_n "checking whether to build libbacktrace support... " >&6; }
-  if test "$enable_libstdcxx_backtrace" == "auto"; then
+  if test "$enable_libstdcxx_backtrace" = "auto"; then
     enable_libstdcxx_backtrace=no
   fi
-  if test "$enable_libstdcxx_backtrace" == "yes"; then
+  if test "$enable_libstdcxx_backtrace" = "yes"; then
     BACKTRACE_SUPPORTED=1
 
     for ac_header in sys/mman.h
@@ -78563,7 +78563,7 @@ else
 fi
 
 
-    if test "$enable_libstdcxx_backtrace" != no; then
+    if test "$enable_libstdcxx_backtrace" = yes; then
   ENABLE_BACKTRACE_TRUE=
   ENABLE_BACKTRACE_FALSE='#'
 else