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 --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 6aece2a..138bd58 100644 (file)
--- 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 7a0ac40..9b94fd7 100755 (executable)
--- 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