dev-qt/qtwebengine: filter -march on arm64 with gcc for now (qt6)

Bit like Qt5's webengine which did not respect it either. Not ideal
but given the complexity tend to be lucky if it builds at all.

As noted in the comment, please report if this works again so can
cleanup (can test with USE=custom-cflags), may get fixed either
by >=qtwebengine-6.7 (chromium-118) or a new gcc version depending
on where the real issue is, but not planning to pursue this further
myself.

Closes: https://bugs.gentoo.org/920555
Closes: https://bugs.gentoo.org/920568
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

4 files changed, 24 insertions, 0 deletions

diff --git a/dev-qt/qtwebengine/qtwebengine-6.6.1.ebuild b/dev-qt/qtwebengine/qtwebengine-6.6.1.ebuild
index 9299373bfe2e..7a8458a6951a 100644
--- a/dev-qt/qtwebengine/qtwebengine-6.6.1.ebuild
+++ b/dev-qt/qtwebengine/qtwebengine-6.6.1.ebuild
@@ -234,6 +234,12 @@ src_configure() {
 			replace-flags '-g?(gdb)?([2-9])' -g1
 			ewarn "-g2+/-ggdb* *FLAGS replaced with -g1 (enable USE=custom-cflags to keep)"
 		fi
+
+		# Built helpers segfault when using (at least) -march=armv8-a+pauth
+		# (bug #920555, #920568 -- suspected gcc bug). For now, filter all
+		# for simplicity. Override with USE=custom-cflags if wanted, please
+		# report if above -march works again so can cleanup.
+		use arm64 && tc-is-gcc && filter-flags '-march=*' '-mcpu=*'
 	fi
 
 	export NINJA NINJAFLAGS=$(get_NINJAOPTS)
diff --git a/dev-qt/qtwebengine/qtwebengine-6.6.9999.ebuild b/dev-qt/qtwebengine/qtwebengine-6.6.9999.ebuild
index dfbb26ef419e..f6ae0e6143f9 100644
--- a/dev-qt/qtwebengine/qtwebengine-6.6.9999.ebuild
+++ b/dev-qt/qtwebengine/qtwebengine-6.6.9999.ebuild
@@ -234,6 +234,12 @@ src_configure() {
 			replace-flags '-g?(gdb)?([2-9])' -g1
 			ewarn "-g2+/-ggdb* *FLAGS replaced with -g1 (enable USE=custom-cflags to keep)"
 		fi
+
+		# Built helpers segfault when using (at least) -march=armv8-a+pauth
+		# (bug #920555, #920568 -- suspected gcc bug). For now, filter all
+		# for simplicity. Override with USE=custom-cflags if wanted, please
+		# report if above -march works again so can cleanup.
+		use arm64 && tc-is-gcc && filter-flags '-march=*' '-mcpu=*'
 	fi
 
 	export NINJA NINJAFLAGS=$(get_NINJAOPTS)
diff --git a/dev-qt/qtwebengine/qtwebengine-6.7.9999.ebuild b/dev-qt/qtwebengine/qtwebengine-6.7.9999.ebuild
index 7337d24a2a37..5e4b82001f05 100644
--- a/dev-qt/qtwebengine/qtwebengine-6.7.9999.ebuild
+++ b/dev-qt/qtwebengine/qtwebengine-6.7.9999.ebuild
@@ -233,6 +233,12 @@ src_configure() {
 			replace-flags '-g?(gdb)?([2-9])' -g1
 			ewarn "-g2+/-ggdb* *FLAGS replaced with -g1 (enable USE=custom-cflags to keep)"
 		fi
+
+		# Built helpers segfault when using (at least) -march=armv8-a+pauth
+		# (bug #920555, #920568 -- suspected gcc bug). For now, filter all
+		# for simplicity. Override with USE=custom-cflags if wanted, please
+		# report if above -march works again so can cleanup.
+		use arm64 && tc-is-gcc && filter-flags '-march=*' '-mcpu=*'
 	fi
 
 	export NINJA NINJAFLAGS=$(get_NINJAOPTS)
diff --git a/dev-qt/qtwebengine/qtwebengine-6.9999.ebuild b/dev-qt/qtwebengine/qtwebengine-6.9999.ebuild
index 7337d24a2a37..5e4b82001f05 100644
--- a/dev-qt/qtwebengine/qtwebengine-6.9999.ebuild
+++ b/dev-qt/qtwebengine/qtwebengine-6.9999.ebuild
@@ -233,6 +233,12 @@ src_configure() {
 			replace-flags '-g?(gdb)?([2-9])' -g1
 			ewarn "-g2+/-ggdb* *FLAGS replaced with -g1 (enable USE=custom-cflags to keep)"
 		fi
+
+		# Built helpers segfault when using (at least) -march=armv8-a+pauth
+		# (bug #920555, #920568 -- suspected gcc bug). For now, filter all
+		# for simplicity. Override with USE=custom-cflags if wanted, please
+		# report if above -march works again so can cleanup.
+		use arm64 && tc-is-gcc && filter-flags '-march=*' '-mcpu=*'
 	fi
 
 	export NINJA NINJAFLAGS=$(get_NINJAOPTS)