media-libs/mesa: Replace REQUIRED_USE with ewarns

Mesa has a lot of configuration options and many of them are only
meaningful when specific Gallium drivers are enabled. Previously we
attempted to specify all of those dependencies with REQUIRED_USE logic
which was tedious for users to configure but ensured they knew what they
were getting.

With the transition to Meson, some configuration combinations that had
not been specified in REQUIRED_USE (and with autotools were silently
ignored) began producing configuration errors. Rather than extend
REQUIRED_USE instead provide a warning in pkg_prepare().

Closes: https://bugs.gentoo.org/658892
Closes: https://bugs.gentoo.org/658938
Closes: https://bugs.gentoo.org/663418
Closes: https://bugs.gentoo.org/663470
Closes: https://bugs.gentoo.org/663660

1 files changed, 111 insertions, 15 deletions

diff --git a/media-libs/mesa/mesa-9999.ebuild b/media-libs/mesa/mesa-9999.ebuild
index 346320a1fc6b..0ccb06194dc8 100644
--- a/media-libs/mesa/mesa-9999.ebuild
+++ b/media-libs/mesa/mesa-9999.ebuild
@@ -41,19 +41,13 @@ IUSE="${IUSE_VIDEO_CARDS}
 	vulkan wayland xa xvmc"
 
 REQUIRED_USE="
-	d3d9?   ( dri3 gallium )
-	llvm?   ( gallium )
-	opencl? ( gallium llvm || ( video_cards_r600 video_cards_radeonsi ) )
+	d3d9?   ( dri3 )
 	gles1?  ( egl )
 	gles2?  ( egl )
-	lm_sensors? ( gallium )
-	vaapi? ( gallium )
-	vdpau? ( gallium )
 	vulkan? ( dri3
 			  || ( video_cards_i965 video_cards_radeonsi )
 			  video_cards_radeonsi? ( llvm ) )
 	wayland? ( egl gbm )
-	xa?  ( gallium )
 	video_cards_freedreno?  ( gallium )
 	video_cards_intel?  ( classic )
 	video_cards_i915?   ( || ( classic gallium ) )
@@ -250,6 +244,72 @@ llvm_check_deps() {
 	has_version "sys-devel/llvm[${flags}]"
 }
 
+pkg_pretend() {
+	if use d3d9; then
+		if ! use video_cards_r300 &&
+		   ! use video_cards_r600 &&
+		   ! use video_cards_radeonsi &&
+		   ! use video_cards_nouveau &&
+		   ! use video_cards_vmware; then
+			ewarn "Ignoring USE=d3d9       since VIDEO_CARDS does not contain r300, r600, radeonsi, nouveau, or vmware"
+		fi
+	fi
+
+	if use opencl; then
+		if ! use video_cards_r600 &&
+		   ! use video_cards_radeonsi; then
+			ewarn "Ignoring USE=opencl     since VIDEO_CARDS does not contain r600 or radeonsi"
+		fi
+	fi
+
+	if use vaapi; then
+		if ! use video_cards_r600 &&
+		   ! use video_cards_radeonsi &&
+		   ! use video_cards_nouveau; then
+			ewarn "Ignoring USE=vaapi      since VIDEO_CARDS does not contain r600, radeonsi, or nouveau"
+		fi
+	fi
+
+	if use vdpau; then
+		if ! use video_cards_r300 &&
+		   ! use video_cards_r600 &&
+		   ! use video_cards_radeonsi &&
+		   ! use video_cards_nouveau; then
+			ewarn "Ignoring USE=vdpau      since VIDEO_CARDS does not contain r300, r600, radeonsi, or nouveau"
+		fi
+	fi
+
+	if use xa; then
+		if ! use video_cards_freedreno &&
+		   ! use video_cards_nouveau; then
+			ewarn "Ignoring USE=xa         since VIDEO_CARDS does not contain freedreno or nouveau"
+		fi
+	fi
+
+	if use xvmc; then
+		if ! use video_cards_r600 &&
+		   ! use video_cards_nouveau; then
+			ewarn "Ignoring USE=xvmc       since VIDEO_CARDS does not contain r600 or nouveau"
+		fi
+	fi
+
+	if ! use gallium; then
+		use d3d9       && ewarn "Ignoring USE=d3d9       since USE does not contain gallium"
+		use lm_sensors && ewarn "Ignoring USE=lm_sensors since USE does not contain gallium"
+		use llvm       && ewarn "Ignoring USE=llvm       since USE does not contain gallium"
+		use opencl     && ewarn "Ignoring USE=opencl     since USE does not contain gallium"
+		use vaapi      && ewarn "Ignoring USE=vaapi      since USE does not contain gallium"
+		use vdpau      && ewarn "Ignoring USE=vdpau      since USE does not contain gallium"
+		use unwind     && ewarn "Ignoring USE=unwind     since USE does not contain gallium"
+		use xa         && ewarn "Ignoring USE=xa         since USE does not contain gallium"
+		use xvmc       && ewarn "Ignoring USE=xvmc       since USE does not contain gallium"
+	fi
+
+	if ! use llvm; then
+		use opencl     && ewarn "Ignoring USE=opencl     since USE does not contain llvm"
+	fi
+}
+
 pkg_setup() {
 	# warning message for bug 459306
 	if use llvm && has_version sys-devel/llvm[!debug=]; then
@@ -293,14 +353,52 @@ multilib_src_configure() {
 
 	if use gallium; then
 		emesonargs+=(
-			$(meson_use d3d9 gallium-nine)
 			$(meson_use llvm)
-			$(meson_use vaapi gallium-va)
-			$(meson_use vdpau gallium-vdpau)
-			$(meson_use xa gallium-xa)
-			$(meson_use xvmc gallium-xvmc)
+			$(meson_use lm_sensors lmsensors)
+			$(meson_use unwind libunwind)
 		)
-		use vaapi && emesonargs+=( -Dva-libs-path=/usr/$(get_libdir)/va/drivers )
+
+		if use video_cards_r300 ||
+		   use video_cards_r600 ||
+		   use video_cards_radeonsi ||
+		   use video_cards_nouveau ||
+		   use video_cards_vmware; then
+			emesonargs+=($(meson_use d3d9 gallium-nine))
+		else
+			emesonargs+=(-Dgallium-nine=false)
+		fi
+
+		if use video_cards_r600 ||
+		   use video_cards_radeonsi ||
+		   use video_cards_nouveau; then
+			emesonargs+=($(meson_use vaapi gallium-va))
+			use vaapi && emesonargs+=( -Dva-libs-path=/usr/$(get_libdir)/va/drivers )
+		else
+			emesonargs+=(-Dgallium-va=false)
+		fi
+
+		if use video_cards_r300 ||
+		   use video_cards_r600 ||
+		   use video_cards_radeonsi ||
+		   use video_cards_nouveau; then
+			emesonargs+=($(meson_use vdpau gallium-vdpau))
+		else
+			emesonargs+=(-Dgallium-vdpau=false)
+		fi
+
+		if use video_cards_freedreno ||
+		   use video_cards_nouveau; then
+			emesonargs+=($(meson_use xa gallium-xa))
+		else
+			emesonargs+=(-Dgallium-xa=false)
+		fi
+
+		if use video_cards_r600 ||
+		   use video_cards_nouveau; then
+			emesonargs+=($(meson_use xvmc gallium-xvmc))
+		else
+			emesonargs+=(-Dgallium-xvmc=false)
+		fi
 
 		gallium_enable video_cards_vc4 vc4
 		gallium_enable video_cards_vivante etnaviv
@@ -374,8 +472,6 @@ multilib_src_configure() {
 		$(meson_use gles1)
 		$(meson_use gles2)
 		$(meson_use selinux)
-		$(meson_use unwind libunwind)
-		$(meson_use lm_sensors lmsensors)
 		-Dvalgrind=$(usex valgrind auto false)
 		-Ddri-drivers=$(driver_list "${DRI_DRIVERS[*]}")
 		-Dgallium-drivers=$(driver_list "${GALLIUM_DRIVERS[*]}")