From 0653b35c94d4c071bd0fbc9760e44f1b53b62a7b Mon Sep 17 00:00:00 2001
From: =?utf8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
Date: Fri, 30 Jun 2017 17:08:50 +0200
Subject: [PATCH] llvm.eclass: Check for installed package rather than
 executable

Ensure that a specific LLVM slot is installed via using has_version on
"sys-devel/llvm:${SLOT}" rather than checking whether llvm-config is
installed in expected location. While it is a bit slower, this is closer
to a canonical way of testing it and will be useful when we allow
testing for more specific dependency strings. Right now, it could be
helpful if one has broken LLVM installation (i.e. stray files).
---
 eclass/llvm.eclass | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/eclass/llvm.eclass b/eclass/llvm.eclass
index 1128615cd35a..4df3825e6e31 100644
--- a/eclass/llvm.eclass
+++ b/eclass/llvm.eclass
@@ -91,9 +91,9 @@ get_llvm_prefix() {
 			fi
 		fi
 
-		local p=${EPREFIX}/usr/lib/llvm/${slot}
-		if [[ -x ${p}/bin/llvm-config ]]; then
-			echo "${p}"
+		# check if LLVM package is installed
+		if has_version "sys-devel/llvm:${slot}"; then
+			echo "${EPREFIX}/usr/lib/llvm/${slot}"
 			return
 		fi
 	done
@@ -105,13 +105,12 @@ get_llvm_prefix() {
 
 	# fallback to :0
 	# assume it's always <= 4 (the lower max_slot allowed)
-	p=${EPREFIX}/usr
-	if [[ -x ${p}/bin/llvm-config ]]; then
-		echo "${p}"
+	if has_version "sys-devel/llvm:0"; then
+		echo "${EPREFIX}/usr"
 		return
 	fi
 
-	die "No LLVM slot${1:+ <= ${1}} found in PATH!"
+	die "No LLVM slot${1:+ <= ${1}} found installed!"
 }
 
 # @FUNCTION: llvm_pkg_setup
-- 
2.26.2