dev-qt/qtcore: add FORTIFY_SOURCE=3 workaround (force back to =2)

As discussed with asturm until we know what's happening with
the upstream bug. We can consider the opensuse patch once
that's resolved, if the upstream fix isn't made public, almost
certainly via KDE Qt5PatchCollection. But we'll see.

Closes: https://bugs.gentoo.org/847145
Signed-off-by: Sam James <sam@gentoo.org>

1 files changed, 121 insertions, 0 deletions

diff --git a/dev-qt/qtcore/qtcore-5.15.4-r1.ebuild b/dev-qt/qtcore/qtcore-5.15.4-r1.ebuild
new file mode 100644
index 000000000000..034469ed1e79
--- /dev/null
+++ b/dev-qt/qtcore/qtcore-5.15.4-r1.ebuild
@@ -0,0 +1,121 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+QT5_KDEPATCHSET_REV=1
+QT5_MODULE="qtbase"
+inherit linux-info flag-o-matic qt5-build
+
+DESCRIPTION="Cross-platform application development framework"
+SLOT=5/${QT5_PV}
+
+if [[ ${QT5_BUILD_TYPE} == release ]]; then
+	KEYWORDS="~amd64 ~arm ~arm64 ~hppa ~loong ~ppc ~ppc64 ~riscv ~sparc ~x86"
+fi
+
+IUSE="icu old-kernel systemd"
+
+DEPEND="
+	dev-libs/double-conversion:=
+	dev-libs/glib:2
+	dev-libs/libpcre2[pcre16,unicode]
+	sys-libs/zlib:=
+	icu? ( dev-libs/icu:= )
+	!icu? ( virtual/libiconv )
+	systemd? ( sys-apps/systemd:= )
+"
+RDEPEND="${DEPEND}"
+
+QT5_TARGET_SUBDIRS=(
+	src/tools/bootstrap
+	src/tools/moc
+	src/tools/rcc
+	src/corelib
+	src/tools/qlalr
+	doc
+)
+
+QT5_GENTOO_PRIVATE_CONFIG=(
+	!:network
+	!:sql
+	!:testlib
+	!:xml
+)
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-5.15.3-pthread.patch # bug 803470
+)
+
+pkg_pretend() {
+	use kernel_linux || return
+	get_running_version
+	if kernel_is -lt 4 11 && ! use old-kernel; then
+		ewarn "The running kernel is older than 4.11. USE=old-kernel is needed for"
+		ewarn "dev-qt/qtcore to function on this kernel properly. Bugs #669994, #672856"
+	fi
+}
+
+src_prepare() {
+	# don't add -O3 to CXXFLAGS, bug 549140
+	sed -i -e '/CONFIG\s*+=/s/optimize_full//' src/corelib/corelib.pro || die
+
+	# fix missing qt_version_tag symbol w/ LTO, bug 674382
+	sed -i -e 's/^gcc:ltcg/gcc/' src/corelib/global/global.pri || die
+
+	# Broken with FORTIFY_SOURCE=3
+	# Our toolchain sets F_S=2 by default w/ >= -O2, so we need
+	# to unset F_S first, then explicitly set 2, to negate any default
+	# and anything set by the user if they're choosing 3 (or if they've
+	# modified GCC to set 3).
+	#
+	# Refs:
+	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105078
+	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105709
+	# https://bugreports.qt.io/browse/QTBUG-103782
+	# bug #847145
+	if is-flagq '-O[23]' || is-flagq '-Ofast' ; then
+		# We can't unconditionally do this b/c we fortify needs
+		# some level of optimisation.
+		filter-flags -D_FORTIFY_SOURCE=3
+		# (Qt doesn't seem to respect CPPFLAGS?)
+		append-flags -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2
+	fi
+
+	qt5-build_src_prepare
+}
+
+src_configure() {
+	local myconf=(
+		$(qt_use icu)
+		$(qt_use !icu iconv)
+		$(qt_use systemd journald)
+	)
+	use old-kernel && myconf+=(
+		-no-feature-renameat2 # needs Linux 3.16, bug 669994
+		-no-feature-getentropy # needs Linux 3.17, bug 669994
+		-no-feature-statx # needs Linux 4.11, bug 672856
+	)
+	qt5-build_src_configure
+}
+
+src_install() {
+	qt5-build_src_install
+	qt5_symlink_binary_to_path qmake 5
+
+	local flags=(
+		DBUS FREETYPE IMAGEFORMAT_JPEG IMAGEFORMAT_PNG
+		OPENGL OPENSSL SSL WIDGETS
+	)
+
+	for flag in ${flags[@]}; do
+		cat >> "${D}"/${QT5_HEADERDIR}/QtCore/qconfig.h <<- _EOF_ || die
+
+			#if defined(QT_NO_${flag}) && defined(QT_${flag})
+			# undef QT_NO_${flag}
+			#elif !defined(QT_NO_${flag}) && !defined(QT_${flag})
+			# define QT_NO_${flag}
+			#endif
+		_EOF_
+	done
+}