revert the previous. it introduces a different, worse, error.

Author: mrgtwentythree

external/gpl3/gcc/lib/libstdc++-v3/Makefile

@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.60 2025/10/14 07:19:46 mrg Exp $
+#	$NetBSD: Makefile,v 1.61 2025/10/14 09:17:05 mrg Exp $
 
 REQUIRETOOLS=	yes
 NOLINT=		# defined
@@ -62,9 +62,10 @@ SRCS=		${LIBSUPCXXSRCS} ${LIBSTDCXXSRCS}
 
 GCC_MACHINE_SUBDIR=${MACHINE_CPU:C/powerpc.*/rs6000/:C/x86_64/i386/}
 
-# Only the shared library is build with -D_GLIBCXX_SHARED, and the
-# static library shouldn't need to provide old symbols.
-CSHLIBFLAGS+=	-D_GLIBCXX_SHARED
+# The compatibility files are built without -D_GLIBCXX_SHARED.
+.for s in ${SRCS:Ncompatibility.cc:Ncompatibility-debug_list.cc:Ncompatibility-debug_list-2.cc:Ncompatibility-atomic-c++0x.cc:Ncompatibility-c++0x.cc:Ncompatibility-chrono.cc:Ncompatibility-condvar.cc:Ncompatibility-thread-c++0x.cc}
+CSHLIBFLAGS.${s}+=	-D_GLIBCXX_SHARED
+.endfor
 
 CXXFLAGS+=	-fno-implicit-templates
 CPPFLAGS+=	-I${DIST}/libstdc++-v3/include