libstdc++: Make _GLIBCXX_HOSTED respect -ffreestanding [PR103626]

This allows the library to switch to freestanding mode when compiling
with the -ffreestanding flag. This means you don't need a separate
libstdc++ build configured with --disable-hosted-libstdcxx in order to
compile for a freestanding environment.

The testsuite support files cannot be compiled for freestanding, so add
-fno-freestanding to override any -ffreestanding in the test flags.

libstdc++-v3/ChangeLog:

	PR libstdc++/103626
	* acinclude.m4 (GLIBCXX_ENABLE_HOSTED): Define _GLIBCXX_HOSTED
	to __STDC_HOSTED__ for non-freestanding installations.
	* configure: Regenerate.
	* include/Makefile.am (${host_builddir}/c++config.h): Adjust
	grep pattern.
	* include/Makefile.in: Regenerate.
	* testsuite/lib/libstdc++.exp (v3-build_support): Use
	-fno-freestanding.
	* testsuite/libstdc++-abi/abi.exp: Likewise.

1 files changed, 1 insertions, 1 deletions

diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 07916d1..1ff28af 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -15651,7 +15651,7 @@ $as_echo "$as_me: Only freestanding libraries will be built" >&6;}
     fi
   else
     is_hosted=yes
-    hosted_define=1
+    hosted_define=__STDC_HOSTED__
   fi