[gcc r14-2875] Use substituted GDCFLAGS

[gcc r14-2875] Use substituted GDCFLAGS

[Andreas Schwab]

https://gcc.gnu.org/g:1ed21e23d6d4da8201a09558b71d9a34281e54dd

commit r14-2875-g1ed21e23d6d4da8201a09558b71d9a34281e54dd
Author: Andreas Schwab <schwab@suse.de>
Date:   Sun Jul 16 19:43:56 2023 +0200

    Use substituted GDCFLAGS
    
    Use the substituted value for GCDFLAGS instead of hardcoding $(CFLAGS) so
    that the subdir configure scripts use the configured value.
    
            * configure.ac (GDCFLAGS): Set default from ${CFLAGS}.
            * configure: Regenerate.
            * Makefile.in (GDCFLAGS): Substitute @GDCFLAGS@.

Diff:
---
 Makefile.in  | 2 +-
 configure    | 1 +
 configure.ac | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/Makefile.in b/Makefile.in
index 04307ca561b..144bccd2603 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -444,7 +444,7 @@ LIBCFLAGS = $(CFLAGS)
 CXXFLAGS = @CXXFLAGS@
 LIBCXXFLAGS = $(CXXFLAGS) -fno-implicit-templates
 GOCFLAGS = $(CFLAGS)
-GDCFLAGS = $(CFLAGS)
+GDCFLAGS = @GDCFLAGS@
 GM2FLAGS = $(CFLAGS)
 
 # Pass additional PGO and LTO compiler options to the PGO build.
diff --git a/configure b/configure
index 0d3f5c6455d..3269da9829f 100755
--- a/configure
+++ b/configure
@@ -12947,6 +12947,7 @@ fi
 
 
 
+GDCFLAGS=${GDCFLAGS-${CFLAGS}}
 
 # Target tools.
 
diff --git a/configure.ac b/configure.ac
index dddab2a56d8..d07a0fa7698 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3662,6 +3662,7 @@ AC_SUBST(CFLAGS)
 AC_SUBST(CXXFLAGS)
 AC_SUBST(GDC)
 AC_SUBST(GDCFLAGS)
+GDCFLAGS=${GDCFLAGS-${CFLAGS}}
 
 # Target tools.
 AC_ARG_WITH([build-time-tools],