prepare for /usr/bin/gfortran.

in the Makefile, add fortran to the list of languages to configure.
add configure-target-libquadmath and configure-target-libgfortran
to the listof mknative targets to invoke.

while here also remove some HAVE_GCC < 12 support.

in mknative-gcc, remove ancient dead get_libg2c(), grab a couple
more libgomp variables (will be used to replace some hard coded
things and also adds the gomp/fortran portions), add new get
functions for libquadmath and libgfortran, and also fetch the rest
of the necessary variables.

Author: mrgtwentythree

tools/gcc/Makefile

@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.118 2025/09/17 02:17:51 mrg Exp $
+#	$NetBSD: Makefile,v 1.119 2026/01/17 23:43:46 mrg Exp $
 
 .include <bsd.hostinit.mk>
 
@@ -14,18 +14,19 @@ MKNATIVE=		${.CURDIR}/mknative-${EXTERNAL_GCC_SUBDIR}
 CC_FOR_BUILD=		${HOST_CXX:Q}
 MKNATIVE?=		${.CURDIR}/mknative-gcc
 
-# Force C++11 so builds succeed on hosts where this isn't the compiler
-# default, e.g., NetBSD 8.x with GCC 5.5.
-.if ${HAVE_GCC} > 10
+# GCC since 10.x (at least) needs C++11
 HOST_CXXFLAGS+=		-std=c++11
-.endif
 
 .if ${MACHINE_ARCH} == "x86_64" || ${MACHINE_ARCH} == "sparc64"
 MULTILIB_ARGS= --enable-multilib
 .else
 MULTILIB_ARGS= --disable-multilib
 .endif
 
+.if ${HAVE_GCC} >= 14
+GCC_LANGUAGES+= fortran
+.endif
+
 .if ${MKSOFTFLOAT} != "no" && ${MACHINE_CPU} != "m68k" \
     && ${MACHINE_CPU} != "or1k" && ${MACHINE_CPU} != "sh3"
 SOFTFLOAT_ARGS=	-with-float=soft
@@ -118,6 +119,12 @@ MKNATIVE_CONFIG_TARGET_LIBS+= \
 	configure-target-libbacktrace \
 	configure-target-libobjc
 
+.if ${HAVE_GCC} >= 14
+MKNATIVE_CONFIG_TARGET_LIBS+= \
+	configure-target-libquadmath \
+	configure-target-libgfortran
+.endif
+
 # XXX needs to build libstdc++ fully, which fails
 .if 0
 MKNATIVE_CONFIG_TARGET_LIBS+= \

tools/gcc/mknative-gcc

@@ -1,5 +1,5 @@
 #!/bin/sh
-#	$NetBSD: mknative-gcc,v 1.122 2025/10/29 05:35:15 mrg Exp $
+#	$NetBSD: mknative-gcc,v 1.123 2026/01/17 23:43:46 mrg Exp $
 #
 # Shell script for generating all the constants needed for a native
 # platform build of gcc.
@@ -45,26 +45,6 @@ sanitise_includes () {
 		-e "s,-I/usr/include/[^ 	]*,,"
 }
 
-##### lib/libg2c #####
-
-get_libg2c () {
-	mkdir -p $_OUTDIR/lib/libg2c3/arch/$_MACHINE_ARCH
-
-	write_c $_OUTDIRBASE/lib/libg2c3/arch/$_MACHINE_ARCH/config.h <$_TMPDIR/$_PLATFORM/libf2c/libU77/config.h
-	write_c $_OUTDIRBASE/lib/libg2c3/arch/$_MACHINE_ARCH/g2c.h <$_TMPDIR/$_PLATFORM/libf2c/g2c.h
-
-	{
-		getvars $_PLATFORM/libf2c/Makefile \
-			F2CEXT
-		getvars $_PLATFORM/libf2c/libF77/Makefile \
-			ALL_CFLAGS OBJS
-		getvars $_PLATFORM/libf2c/libI77/Makefile \
-			ALL_CFLAGS OBJS | sed 's,=,+=,'
-		getvars $_PLATFORM/libf2c/libU77/Makefile \
-			ALL_CFLAGS OBJS | sed 's,=,+=,'
-	} | write_mk $_OUTDIRBASE/lib/libg2c3/arch/$_MACHINE_ARCH/defs.mk
-}
-
 ##### lib/libgcc #####
 
 get_libgcc () {
@@ -168,6 +148,8 @@ get_libgomp () {
 
 	getvars $_PLATFORM/libgomp/Makefile \
 		libgomp_la_SOURCES \
+		nodist_libsubinclude_HEADERS \
+		nodist_finclude_HEADERS \
 		| write_mk $_OUTDIRBASE/lib/$_subdir/defs.mk
 
 	write_c $_OUTDIRBASE/lib/$_subdir/arch/$_MACHINE_ARCH/config.h \
@@ -192,6 +174,43 @@ get_libbacktrace () {
 		<$_TMPDIR/$_PLATFORM/$_subdir/backtrace-supported.h
 }
 
+##### lib/libquadmath #####
+
+get_libquadmath () {
+	_subdir="$1"
+
+	mkdir -p $_OUTDIR/lib/$_subdir
+	# libquadmath config.h appears to be netbsd-cpu agnostic
+	write_c $_OUTDIRBASE/lib/$_subdir/config.h \
+		<$_TMPDIR/$_PLATFORM/$_subdir/config.h
+
+	getvars $_PLATFORM/$_subdir/Makefile \
+		libquadmath_la_SOURCES \
+		| write_mk $_OUTDIRBASE/lib/$_subdir/defs.mk
+}
+
+##### lib/libgfortran #####
+
+get_libgfortran () {
+	_subdir="$1"
+
+	mkdir -p $_OUTDIR/lib/$_subdir/arch/$_MACHINE_ARCH
+	write_c $_OUTDIRBASE/lib/$_subdir/arch/$_MACHINE_ARCH/config.h \
+		<$_TMPDIR/$_PLATFORM/$_subdir/config.h
+
+	getvars $_PLATFORM/$_subdir/Makefile \
+		libgfortran_la_SOURCES \
+		FPU_HOST_HEADER \
+		nodist_finclude_HEADERS \
+		gfor_c_HEADERS \
+		i_matmul_c i_matmulavx128_c i_matmull_c \
+		gfor_specific_src gfor_ieee_src gfor_ieee_helper_src \
+		| write_mk $_OUTDIRBASE/lib/$_subdir/arch/$_MACHINE_ARCH/defs.mk
+
+	write_mk $_OUTDIRBASE/lib/$_subdir/libgfortran.spec \
+		<$_TMPDIR/$_PLATFORM/libgfortran/libgfortran.spec
+}
+
 ##### lib/libobjc #####
 
 get_libobjc () {
@@ -376,6 +395,7 @@ get_gcc () {
 		getvars gcc/Makefile \
 			ALL_CFLAGS ALL_CPPFLAGS C_AND_OBJC_OBJS C_OBJS CCCP_OBJS \
 			GCC_OBJS GCOV_OBJS GCOV_DUMP_OBJS GXX_OBJS GTM_H PROTO_OBJS ${_extravars1} \
+			ALL_HOST_FRONTEND_OBJS \
 			INCLUDES md_file OBJC_OBJS OBJS out_file version \
 			BUILD_PREFIX RTL_H RTL_BASE_H TREE_H ${_hconfig_h} BASIC_BLOCK_H GCC_H \
 			D_TARGET_DEF \
@@ -392,7 +412,7 @@ get_gcc () {
 		getvars gcc/Makefile \
 			CXX_OBJS CXX_C_OBJS | sed 's/cp\///g'
 		getvars gcc/Makefile \
-			F77_OBJS | sed 's/f\///g'
+			F95_OBJS GFORTRAN_D_OBJS | sed 's/fortran\///g'
 		getvars libcpp/Makefile \
 			libcpp_a_OBJS
 		getvars gcc/Makefile \
@@ -510,6 +530,8 @@ gcc*)
 	get_libdecnumber libdecnumber
 	get_libgomp libgomp
 	get_libbacktrace libbacktrace
+	get_libquadmath libquadmath
+	get_libgfortran libgfortran
 	exit 0
 	;;