[gcc r14-3785] libstdc++: Disable <stacktrace> support by default for avr

[Jonathan Wakely]

https://gcc.gnu.org/g:d295a5341d0cae95c199e0aabcbcde82c6fff0d1

commit r14-3785-gd295a5341d0cae95c199e0aabcbcde82c6fff0d1
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Sep 5 11:14:02 2023 +0100

    libstdc++: Disable <stacktrace> support by default for avr
    
    libstdc++-v3/ChangeLog:
    
            * acinclude.m4 (GLIBCXX_ENABLE_BACKTRACE): Disable by default
            for avr.
            * configure: Regenerate.

Diff:
---
 libstdc++-v3/acinclude.m4 | 5 ++++-
 libstdc++-v3/configure    | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index b7210e09d898..15b3d74ffb73 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -5481,7 +5481,10 @@ BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize"
 
   AC_MSG_CHECKING([whether to build libbacktrace support])
   if test "$enable_libstdcxx_backtrace" = "auto"; then
-    enable_libstdcxx_backtrace="$is_hosted"
+    case "$host" in
+      avr-*-*) enable_libstdcxx_backtrace=no ;;
+      *) enable_libstdcxx_backtrace="$is_hosted" ;;
+    esac
   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 dcb9fd6158c9..22cb5b02d74b 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -73156,7 +73156,10 @@ 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
-    enable_libstdcxx_backtrace="$is_hosted"
+    case "$host" in
+      avr-*-*) enable_libstdcxx_backtrace=no ;;
+      *) enable_libstdcxx_backtrace="$is_hosted" ;;
+    esac
   fi
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: $enable_libstdcxx_backtrace" >&5
 $as_echo "$enable_libstdcxx_backtrace" >&6; }