dev-qt/qtwebengine: "fix" build with clang-18 + -march=native (qt6)

Needs more looking into but want a quick workaround before 6.7.1
releases with clang users having started to use 18.

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

3 files changed, 33 insertions, 0 deletions

diff --git a/dev-qt/qtwebengine/qtwebengine-6.7.0.ebuild b/dev-qt/qtwebengine/qtwebengine-6.7.0.ebuild
index 997dbaf4ec5f..0829dcfa3b22 100644
--- a/dev-qt/qtwebengine/qtwebengine-6.7.0.ebuild
+++ b/dev-qt/qtwebengine/qtwebengine-6.7.0.ebuild
@@ -239,6 +239,17 @@ src_configure() {
 		# 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=*'
+
+		# skia and xnnpack fail with clang-18 + some(?) -march=native while
+		# can't reproduce with seemingly equivalent =skylake), needs more
+		# looking into as there may be something odd going on (clang bug?).
+		# Note that upstream Qt disallows custom *FLAGS on qtwebengine meaning
+		# we are not supposed to pass -march=native in the first place.
+		# TODO: try dropping this on major Qt and clang bumps
+		# See also: https://groups.google.com/g/skia-discuss/c/DNW4oq3W2fI
+		# (Transform_inl.h:769:21: error: AVX vector <snip> without 'evex512')
+		use amd64 && tc-is-clang && [[ $(clang-major-version) -ge 18 ]] &&
+			filter-flags -march=native
 	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 6dc080fed1e4..750f700160b2 100644
--- a/dev-qt/qtwebengine/qtwebengine-6.7.9999.ebuild
+++ b/dev-qt/qtwebengine/qtwebengine-6.7.9999.ebuild
@@ -236,6 +236,17 @@ src_configure() {
 		# 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=*'
+
+		# skia and xnnpack fail with clang-18 + some(?) -march=native while
+		# can't reproduce with seemingly equivalent =skylake), needs more
+		# looking into as there may be something odd going on (clang bug?).
+		# Note that upstream Qt disallows custom *FLAGS on qtwebengine meaning
+		# we are not supposed to pass -march=native in the first place.
+		# TODO: try dropping this on major Qt and clang bumps
+		# See also: https://groups.google.com/g/skia-discuss/c/DNW4oq3W2fI
+		# (Transform_inl.h:769:21: error: AVX vector <snip> without 'evex512')
+		use amd64 && tc-is-clang && [[ $(clang-major-version) -ge 18 ]] &&
+			filter-flags -march=native
 	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 6dc080fed1e4..750f700160b2 100644
--- a/dev-qt/qtwebengine/qtwebengine-6.9999.ebuild
+++ b/dev-qt/qtwebengine/qtwebengine-6.9999.ebuild
@@ -236,6 +236,17 @@ src_configure() {
 		# 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=*'
+
+		# skia and xnnpack fail with clang-18 + some(?) -march=native while
+		# can't reproduce with seemingly equivalent =skylake), needs more
+		# looking into as there may be something odd going on (clang bug?).
+		# Note that upstream Qt disallows custom *FLAGS on qtwebengine meaning
+		# we are not supposed to pass -march=native in the first place.
+		# TODO: try dropping this on major Qt and clang bumps
+		# See also: https://groups.google.com/g/skia-discuss/c/DNW4oq3W2fI
+		# (Transform_inl.h:769:21: error: AVX vector <snip> without 'evex512')
+		use amd64 && tc-is-clang && [[ $(clang-major-version) -ge 18 ]] &&
+			filter-flags -march=native
 	fi
 
 	export NINJA NINJAFLAGS=$(get_NINJAOPTS)