dev-util/mingw64-runtime: avoid libssp references without -fstack-protector

mingw64-runtime-7.0.0 added basic support of _FORTIFY_SOURCE to harden
strcpy() and memcpy() via __strcpy_chk() __memcpy_chk() similar to glibc.

Unfortunately that imposes a new dependency on every caller that defines
_FORTIFY_SOURCE to link against libssp as minw64-runtime does not provide
__strcpy_chk() and friends. For comparison glibc does provide __strcpy_chk.

To avoid widespread breakage (including build failure of USE=ssp gcc itself)
we enable __strcpy_chk() checks only when -fstack-protector* options are set.

Package-Manager: Portage-2.3.85, Repoman-2.3.20
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

2 files changed, 134 insertions, 0 deletions

diff --git a/dev-util/mingw64-runtime/files/mingw64-runtime-7.0.0-fortify-only-ssp.patch b/dev-util/mingw64-runtime/files/mingw64-runtime-7.0.0-fortify-only-ssp.patch
new file mode 100644
index 000000000000..72ddd775a2ea
--- /dev/null
+++ b/dev-util/mingw64-runtime/files/mingw64-runtime-7.0.0-fortify-only-ssp.patch
@@ -0,0 +1,16 @@
+--- a/mingw-w64-headers/crt/_mingw_mac.h
++++ b/mingw-w64-headers/crt/_mingw_mac.h
+@@ -301,7 +301,12 @@
+ #  define __mingw_attribute_artificial
+ #endif
+ 
+-#if _FORTIFY_SOURCE > 0 && __OPTIMIZE__ > 0 && __MINGW_GNUC_PREREQ(4, 1)
++/* __SSP__ is a workaround to avoid reference to libssp when user did not request it:
++ *     https://sourceforge.net/p/mingw-w64/bugs/818/
++ * Otherwise it breaks both USE=ssp gcc bootstrap and projects that happen to use
++ * strcpy/memcpy.
++ */
++#if _FORTIFY_SOURCE > 0 && __OPTIMIZE__ > 0 && __MINGW_GNUC_PREREQ(4, 1) && __SSP__ > 0
+ #  if _FORTIFY_SOURCE > 1
+ #    define __MINGW_FORTIFY_LEVEL 2
+ #  else
diff --git a/dev-util/mingw64-runtime/mingw64-runtime-7.0.0-r1.ebuild b/dev-util/mingw64-runtime/mingw64-runtime-7.0.0-r1.ebuild
new file mode 100644
index 000000000000..82f85e2e5435
--- /dev/null
+++ b/dev-util/mingw64-runtime/mingw64-runtime-7.0.0-r1.ebuild
@@ -0,0 +1,118 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+export CBUILD=${CBUILD:-${CHOST}}
+export CTARGET=${CTARGET:-${CHOST}}
+if [[ ${CTARGET} == ${CHOST} ]] ; then
+	if [[ ${CATEGORY} == cross-* ]] ; then
+		export CTARGET=${CATEGORY#cross-}
+	fi
+fi
+
+inherit autotools flag-o-matic eutils
+
+DESCRIPTION="Free Win64 runtime and import library definitions"
+HOMEPAGE="http://mingw-w64.sourceforge.net/"
+SRC_URI="mirror://sourceforge/mingw-w64/mingw-w64/mingw-w64-release/mingw-w64-v${PV}.tar.bz2"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+# USE=libraries needs working stage2 compiler: bug #665512
+IUSE="headers-only idl libraries tools"
+RESTRICT="strip"
+
+S="${WORKDIR}/mingw-w64-v${PV}"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-fortify-only-ssp.patch
+)
+
+is_crosscompile() {
+	[[ ${CHOST} != ${CTARGET} ]]
+}
+just_headers() {
+	use headers-only
+}
+alt_prefix() {
+	is_crosscompile && echo /usr/${CTARGET}
+}
+crt_with() {
+	just_headers && echo --without-$1 || echo --with-$1
+}
+crt_use_enable() {
+	just_headers && echo --without-$2 || use_enable "$@"
+}
+crt_use_with() {
+	just_headers && echo --without-$2 || use_with "$@"
+}
+
+pkg_setup() {
+	if [[ ${CBUILD} == ${CHOST} ]] && [[ ${CHOST} == ${CTARGET} ]] ; then
+		die "Invalid configuration"
+	fi
+}
+
+src_configure() {
+	CHOST=${CTARGET} strip-unsupported-flags
+	# Normally mingw-64 does not use dynamic linker.
+	# But at configure time it uses $LDFLAGS.
+	# When default -Wl,--hash-style=gnu is passed
+	# __CTORS_LIST__ / __DTORS_LIST__ is mis-detected
+	# for target ld and binaries crash at shutdown.
+	filter-ldflags '-Wl,--hash-style=*'
+
+	if ! just_headers; then
+		mkdir "${WORKDIR}/headers"
+		pushd "${WORKDIR}/headers" > /dev/null
+		CHOST=${CTARGET} "${S}/configure" \
+			--prefix="${T}/tmproot" \
+			--with-headers \
+			--without-crt \
+			|| die
+		popd > /dev/null
+		append-cppflags "-I${T}/tmproot/include"
+	fi
+
+	# By default configure tries to set --sysroot=${prefix}. We disable
+	# this behaviour with --with-sysroot=no to use gcc's sysroot default.
+	# That way we can cross-build mingw64-runtime with cross-emerge.
+	local prefix="${EPREFIX}"$(alt_prefix)/usr
+	CHOST=${CTARGET} econf \
+		--with-sysroot=no \
+		--prefix="${prefix}" \
+		--libdir="${prefix}"/lib \
+		--with-headers \
+		--enable-sdk \
+		$(crt_with crt) \
+		$(crt_use_enable idl idl) \
+		$(crt_use_with libraries libraries) \
+		$(crt_use_with tools tools) \
+		$(
+			$(tc-getCPP ${CTARGET}) ${CPPFLAGS} -dM - < /dev/null | grep -q __MINGW64__ \
+				&& echo --disable-lib32 --enable-lib64 \
+				|| echo --enable-lib32 --disable-lib64
+		)
+}
+
+src_compile() {
+	if ! just_headers; then
+		emake -C "${WORKDIR}/headers" install
+	fi
+	default
+}
+
+src_install() {
+	default
+
+	if is_crosscompile ; then
+		# gcc is configured to look at specific hard-coded paths for mingw #419601
+		dosym usr /usr/${CTARGET}/mingw
+		dosym usr /usr/${CTARGET}/${CTARGET}
+		dosym usr/include /usr/${CTARGET}/sys-include
+	fi
+
+	rm -rf "${ED}/usr/share"
+}