Make development tools code cross-platform.

1 files changed, 80 insertions, 0 deletions

diff --git a/Library/Homebrew/development_tools.rb b/Library/Homebrew/development_tools.rb
new file mode 100644
index 000000000..fd0d2f263
--- /dev/null
+++ b/Library/Homebrew/development_tools.rb
@@ -0,0 +1,80 @@
+# @private
+class DevelopmentTools
+  class << self
+    def locate(tool)
+      # Don't call tools (cc, make, strip, etc.) directly!
+      # Give the name of the binary you look for as a string to this method
+      # in order to get the full path back as a Pathname.
+      (@locate ||= {}).fetch(tool) do |key|
+        @locate[key] = if File.executable?(path = "/usr/bin/#{tool}")
+          Pathname.new path
+        # Homebrew GCCs most frequently; much faster to check this before xcrun
+        elsif (path = HOMEBREW_PREFIX/"bin/#{tool}").executable?
+          path
+        end
+      end
+    end
+
+    def installed?
+      which("clang") || which("gcc")
+    end
+
+    def default_cc
+      cc = DevelopmentTools.locate "cc"
+      cc.realpath.basename.to_s rescue nil
+    end
+
+    def default_compiler
+      case default_cc
+      # if GCC 4.2 is installed, e.g. via Tigerbrew, prefer it
+      # over the system's GCC 4.0
+      when /^gcc-4.0/ then gcc_42_build_version ? :gcc : :gcc_4_0
+      when /^gcc/ then :gcc
+      when /^llvm/ then :llvm
+      else :clang
+      end
+    end
+
+    def gcc_40_build_version
+      @gcc_40_build_version ||=
+        if (path = locate("gcc-4.0"))
+          `#{path} --version 2>/dev/null`[/build (\d{4,})/, 1].to_i
+        end
+    end
+    alias_method :gcc_4_0_build_version, :gcc_40_build_version
+
+    def gcc_42_build_version
+      @gcc_42_build_version ||=
+        begin
+          gcc = locate("gcc-4.2") || HOMEBREW_PREFIX.join("opt/apple-gcc42/bin/gcc-4.2")
+          if gcc.exist? && !gcc.realpath.basename.to_s.start_with?("llvm")
+            `#{gcc} --version 2>/dev/null`[/build (\d{4,})/, 1].to_i
+          end
+        end
+    end
+    alias_method :gcc_build_version, :gcc_42_build_version
+
+    def llvm_build_version
+      @llvm_build_version ||=
+        if (path = locate("llvm-gcc")) && !path.realpath.basename.to_s.start_with?("clang")
+          `#{path} --version`[/LLVM build (\d{4,})/, 1].to_i
+        end
+    end
+
+    def clang_version
+      @clang_version ||=
+        if (path = locate("clang"))
+          `#{path} --version`[/(?:clang|LLVM) version (\d\.\d)/, 1]
+        end
+    end
+
+    def clang_build_version
+      @clang_build_version ||=
+        if (path = locate("clang"))
+          `#{path} --version`[/clang-(\d{2,})/, 1].to_i
+        end
+    end
+  end
+end
+
+require "extend/os/development_tools"