From 8b27b84b4bef0b364156b26739110b7efe51b4d0 Mon Sep 17 00:00:00 2001
From: Buck Evan <buck.2019@gmail.com>
Date: Sat, 17 Mar 2018 18:03:19 -0700
Subject: [PATCH] fix clang build version on Ubuntu Artful

Ported from https://github.com/Linuxbrew/brew/pull/621
---
 Library/Homebrew/development_tools.rb |  2 +-
 Library/Homebrew/system_config.rb     | 13 ++++++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/development_tools.rb b/Library/Homebrew/development_tools.rb
index ba342c435c..1f0d77d148 100644
--- a/Library/Homebrew/development_tools.rb
+++ b/Library/Homebrew/development_tools.rb
@@ -74,7 +74,7 @@ class DevelopmentTools
     def clang_build_version
       @clang_build_version ||= begin
         if (path = locate("clang")) &&
-           build_version = `#{path} --version`[/clang-(\d{2,})/, 1]
+           build_version = `#{path} --version`[%r{clang(-| version [^ ]+ \(tags/RELEASE_)(\d{2,})}, 2]
           Version.new build_version
         else
           Version::NULL
diff --git a/Library/Homebrew/system_config.rb b/Library/Homebrew/system_config.rb
index 63e162075e..8e3598b294 100644
--- a/Library/Homebrew/system_config.rb
+++ b/Library/Homebrew/system_config.rb
@@ -210,7 +210,18 @@ class SystemConfig
       f.puts "Homebrew Ruby: #{describe_homebrew_ruby}"
       f.puts "GCC-4.0: build #{gcc_4_0}" unless gcc_4_0.null?
       f.puts "GCC-4.2: build #{gcc_4_2}" unless gcc_4_2.null?
-      f.puts "Clang: #{clang.null? ? "N/A" : "#{clang} build #{clang_build}"}"
+      f.print "Clang: "
+      if clang.null?
+        f.print "N/A"
+      else
+        f.print "#{clang} build "
+        if clang_build.null?
+          f.print "(parse error)"
+        else
+          f.print clang_build
+        end
+      end
+      f.print "\n"
       f.puts "Git: #{describe_git}"
       f.puts "Curl: #{describe_curl}"
       f.puts "Perl: #{describe_perl}"