introduce "quadmath" set tag and HAVE_QUADMATH variable for others.

will be used for gfortran.

Author: mrgtwentythree

distrib/sets/mkvars.mk

@@ -1,4 +1,4 @@
-# $NetBSD: mkvars.mk,v 1.47 2025/05/13 21:36:26 nia Exp $
+# $NetBSD: mkvars.mk,v 1.48 2026/01/18 08:29:48 mrg Exp $
 
 #
 # Extra variables to print.
@@ -14,6 +14,7 @@ MKEXTRAVARS= \
 	HAVE_GCC \
 	HAVE_GDB \
 	HAVE_LIBGCC_EH \
+	HAVE_QUADMATH \
 	HAVE_MESA_VER \
 	HAVE_NVMM \
 	HAVE_OPENSSL \

distrib/sets/sets.subr

@@ -1,4 +1,4 @@
-#	$NetBSD: sets.subr,v 1.212 2025/07/21 01:46:05 dholland Exp $
+#	$NetBSD: sets.subr,v 1.213 2026/01/18 08:29:48 mrg Exp $
 #
 
 #
@@ -258,7 +258,7 @@ SUBST="${SUBST};s#@MACHINE@#${MACHINE}#g"
 # In each file, a record consists of a path and a System Package name,
 # separated by whitespace. E.g.,
 #
-# 	# $NetBSD: sets.subr,v 1.212 2025/07/21 01:46:05 dholland Exp $
+# 	# $NetBSD: sets.subr,v 1.213 2026/01/18 08:29:48 mrg Exp $
 # 	.			base-sys-root	[keyword[,...]]
 # 	./altroot		base-sys-root
 # 	./bin			base-sys-root
@@ -295,6 +295,7 @@ SUBST="${SUBST};s#@MACHINE@#${MACHINE}#g"
 #	mesa_ver=<n>		<n> = value of ${HAVE_MESA_VER}
 #	nvmm			${HAVE_NVMM} != no
 #	openssl=<n>		<n> = value of ${HAVE_OPENSSL}
+#	quadmath		${HAVE_QUADMATH} != no
 #	uefi			${HAVE_UEFI} != no
 #	efi_rt			${HAVE_EFI_RT} != no
 #	xorg_server_ver=<n>	<n> = value of ${HAVE_XORG_SERVER_VER}
@@ -450,6 +451,9 @@ list_set_files()
 			if ("efi_rt" in wanted) {
 				wanted["efi_rt=" "'"${HAVE_EFI_RT}"'"] = 1
 			}
+			if ("quadmath" in wanted) {
+				wanted["quadmath=" "'"${HAVE_QUADMATH}"'"] = 1
+			}
 			if (("man" in wanted) && ("catpages" in wanted))
 				wanted[".cat"] = 1
 			if (("man" in wanted) && ("manpages" in wanted))

share/mk/bsd.own.mk

@@ -1,4 +1,4 @@
-#      $NetBSD: bsd.own.mk,v 1.1462 2026/01/10 22:05:08 jmcneill Exp $
+#      $NetBSD: bsd.own.mk,v 1.1463 2026/01/18 08:29:48 mrg Exp $
 
 # This needs to be before bsd.init.mk
 .if defined(BSD_MK_COMPAT_FILE)
@@ -132,6 +132,17 @@ MKGCCCMDS?=	no
 NOGCCISL=	# defined
 .endif
 
+#
+# Build GCC with libquadmath.
+# Eg:  grep '#define HAVE_FLOAT128 1' lib/libgfortran/arch/*/config.h
+#
+.if ${MACHINE_ARCH} == "i386" || \
+    ${MACHINE_ARCH} == "x86_64" || \
+    ${MACHINE_ARCH} == "ia64"
+HAVE_QUADMATH?=	yes
+.endif
+HAVE_QUADMATH?=	no
+
 #
 # What binutils is used?
 #