[committed] libstdc++: Disable support by default for freestanding

[Jonathan Wakely via Gcc-patches]

Tested x86_64-linux and x86_64-elf. Pushed to trunk.

-- >8 --

libstdc++-v3/ChangeLog:

        * acinclude.m4 (GLIBCXX_ENABLE_BACKTRACE): Disable by default
        for freestanding.
        * configure: Regenerate.
---
 libstdc++-v3/acinclude.m4 | 2 +-
 libstdc++-v3/configure    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 50c808c6b2d..b7210e09d89 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -5481,7 +5481,7 @@ BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS 
-DBACKTRACE_ELF_SIZE=$elfsize"
 
   AC_MSG_CHECKING([whether to build libbacktrace support])
   if test "$enable_libstdcxx_backtrace" = "auto"; then
-    enable_libstdcxx_backtrace=yes
+    enable_libstdcxx_backtrace="$is_hosted"
   fi
   AC_MSG_RESULT($enable_libstdcxx_backtrace)
   if test "$enable_libstdcxx_backtrace" = "yes"; then
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index db1932300c0..dcb9fd6158c 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -73156,7 +73156,7 @@ 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
-    enable_libstdcxx_backtrace=yes
+    enable_libstdcxx_backtrace="$is_hosted"
   fi
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: 
$enable_libstdcxx_backtrace" >&5
 $as_echo "$enable_libstdcxx_backtrace" >&6; }
-- 
2.41.0