From 135bd0f4429ba1508b7bbf47ffabfc6f3de238ee Mon Sep 17 00:00:00 2001
From: =?utf8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
Date: Thu, 28 Sep 2017 15:16:23 +0200
Subject: [PATCH] media-libs/mesa: Backport LLVM dep fixes to 17.2.1

---
 media-libs/mesa/mesa-17.2.1.ebuild | 103 +++++++++++++++++++++++++----
 1 file changed, 89 insertions(+), 14 deletions(-)

diff --git a/media-libs/mesa/mesa-17.2.1.ebuild b/media-libs/mesa/mesa-17.2.1.ebuild
index f54779f95727..2b6f32728db3 100644
--- a/media-libs/mesa/mesa-17.2.1.ebuild
+++ b/media-libs/mesa/mesa-17.2.1.ebuild
@@ -97,7 +97,6 @@ RDEPEND="
 	llvm? (
 		video_cards_radeonsi? (
 			virtual/libelf:0=[${MULTILIB_USEDEP}]
-			vulkan? ( >=sys-devel/llvm-3.9.0:=[${MULTILIB_USEDEP}] )
 		)
 		video_cards_r600? (
 			virtual/libelf:0=[${MULTILIB_USEDEP}]
@@ -105,7 +104,6 @@ RDEPEND="
 		video_cards_radeon? (
 			virtual/libelf:0=[${MULTILIB_USEDEP}]
 		)
-		>=sys-devel/llvm-3.6.0:=[${MULTILIB_USEDEP}]
 	)
 	opencl? (
 				app-eselect/eselect-opencl
@@ -139,20 +137,84 @@ RDEPEND="${RDEPEND}
 	video_cards_radeonsi? ( ${LIBDRM_DEPSTRING}[video_cards_amdgpu] )
 "
 
-# FIXME: kill the sys-devel/llvm[video_cards_radeon] compat once
-# LLVM < 3.9 is out of the game
-DEPEND="${RDEPEND}
-	${PYTHON_DEPS}
+# Please keep the LLVM dependency block separate. Since LLVM is slotted,
+# we need to *really* make sure we're not pulling one than more slot
+# simultaneously.
+#
+# How to use it:
+# 1. List all the working slots (with min versions) in ||, newest first.
+# 2. Update the := to specify *max* version, e.g. < 7.
+# 3. Specify LLVM_MAX_SLOT, e.g. 6.
+LLVM_DEPSTR="
+	|| (
+		sys-devel/llvm:6[${MULTILIB_USEDEP}]
+		sys-devel/llvm:5[${MULTILIB_USEDEP}]
+		sys-devel/llvm:4[${MULTILIB_USEDEP}]
+		>=sys-devel/llvm-3.9.0:0[${MULTILIB_USEDEP}]
+	)
+	sys-devel/llvm:=[${MULTILIB_USEDEP}]
+"
+LLVM_DEPSTR_AMDGPU=${LLVM_DEPSTR//]/,llvm_targets_AMDGPU(-)]}
+CLANG_DEPSTR=${LLVM_DEPSTR//llvm/clang}
+CLANG_DEPSTR_AMDGPU=${CLANG_DEPSTR//]/,llvm_targets_AMDGPU(-)]}
+RDEPEND="${RDEPEND}
 	llvm? (
-		video_cards_radeonsi? ( || (
-			sys-devel/llvm[llvm_targets_AMDGPU]
-			sys-devel/llvm[video_cards_radeon]
-		) )
+		opencl? (
+			video_cards_r600? (
+				${CLANG_DEPSTR_AMDGPU}
+			)
+			!video_cards_r600? (
+				video_cards_radeonsi? (
+					${CLANG_DEPSTR_AMDGPU}
+				)
+			)
+			!video_cards_r600? (
+				!video_cards_radeonsi? (
+					video_cards_radeon? (
+						${CLANG_DEPSTR_AMDGPU}
+					)
+				)
+			)
+			!video_cards_r600? (
+				!video_cards_radeon? (
+					!video_cards_radeonsi? (
+						${CLANG_DEPSTR}
+					)
+				)
+			)
+		)
+		!opencl? (
+			video_cards_r600? (
+				${LLVM_DEPSTR_AMDGPU}
+			)
+			!video_cards_r600? (
+				video_cards_radeonsi? (
+					${LLVM_DEPSTR_AMDGPU}
+				)
+			)
+			!video_cards_r600? (
+				!video_cards_radeonsi? (
+					video_cards_radeon? (
+						${LLVM_DEPSTR_AMDGPU}
+					)
+				)
+			)
+			!video_cards_r600? (
+				!video_cards_radeon? (
+					!video_cards_radeonsi? (
+						${LLVM_DEPSTR}
+					)
+				)
+			)
+		)
 	)
+"
+unset {LLVM,CLANG}_DEPSTR{,_AMDGPU}
+
+DEPEND="${RDEPEND}
+	${PYTHON_DEPS}
 	opencl? (
-				>=sys-devel/llvm-3.6.0:=[${MULTILIB_USEDEP}]
-				>=sys-devel/clang-3.6.0:=[${MULTILIB_USEDEP}]
-				>=sys-devel/gcc-4.6
+		>=sys-devel/gcc-4.6
 	)
 	sys-devel/gettext
 	virtual/pkgconfig
@@ -187,6 +249,19 @@ x86? (
 	)
 )"
 
+llvm_check_deps() {
+	local flags=${MULTILIB_USEDEP}
+	if use video_cards_r600 || use video_cards_radeon || use video_cards_radeonsi
+	then
+		flags+=",llvm_targets_AMDGPU(-)"
+	fi
+
+	if use opencl; then
+		has_version "sys-devel/clang[${flags}]" || return 1
+	fi
+	has_version "sys-devel/llvm[${flags}]"
+}
+
 pkg_setup() {
 	# warning message for bug 459306
 	if use llvm && has_version sys-devel/llvm[!debug=]; then
@@ -194,7 +269,7 @@ pkg_setup() {
 		ewarn "detected! This can cause problems. For details, see bug 459306."
 	fi
 
-	if use llvm || use opencl; then
+	if use llvm; then
 		llvm_pkg_setup
 	fi
 	python-any-r1_pkg_setup
-- 
2.26.2