Generator for LLVM::CONFIG module, cleaned up

.gitignore

@@ -12,4 +12,5 @@
 coverage/*
 doc/*
 .bundle
-Gemfile.lock
+Gemfile.lock
+lib/llvm/config.rb

ext/ruby-llvm-support/Rakefile

@@ -1,9 +1,9 @@
-require 'rake/clean'
 require 'rubygems'
+require 'rake/clean'
 require 'ffi'
 
-# Change this when updating for a newer LLVM.
-LLVM_VERSION = '3.2'
+require File.expand_path('../../lib/llvm/version', File.dirname(__FILE__))
+include LLVM
 
 def check_llvm_config(name)
   actual_version = `#{name} --version`
@@ -28,15 +28,42 @@ LLVM_CONFIG = invoke_llvm_config('--cxxflags --ldflags')
 
 CXX    = "g++"
 SRC    = "support.cpp"
-OUTPUT = FFI.map_library_name("RubyLLVMSupport-#{LLVM_VERSION}")
 
-CLEAN.include(OUTPUT)
+SUPPORT_LIB = FFI.map_library_name("RubyLLVMSupport-#{LLVM_VERSION}")
+CONFIG_MOD  = File.expand_path('../../lib/llvm/config.rb', File.dirname(__FILE__))
+
+CLEAN.include(SUPPORT_LIB, CONFIG_MOD)
 
-task :default => [:build]
+desc "Build the shared library and config module"
+task :default => [SUPPORT_LIB, CONFIG_MOD]
+
+file SUPPORT_LIB => [SRC] do
+  sh "#{CXX} -shared -lLLVM-#{LLVM_VERSION} #{SRC} #{LLVM_CONFIG} -o #{SUPPORT_LIB}"
+end
 
-desc "Build the shared library"
-task :build => [OUTPUT]
+LLVM_CONFIG_OPTS = [
+  ['COMPONENTS',    :array,  '--components'],
+  ['TARGETS_BUILT', :array,  '--targets-built'],
+  ['HOST_TARGET',   :string, '--host-target'],
+  ['BUILD_MODE',    :string, '--build-mode'],
+]
 
-file OUTPUT => [SRC] do
-  sh "#{CXX} -shared -lLLVM-#{LLVM_VERSION} #{SRC} #{LLVM_CONFIG} -o #{OUTPUT}"
+file CONFIG_MOD do
+  open(CONFIG_MOD, 'w') do |f|
+    f.puts '# Generated by ruby-llvm. Please do not change this file by hand.'
+    f.puts 'module LLVM'
+    f.puts '  module CONFIG'
+
+    LLVM_CONFIG_OPTS.each do |(const, fmt, flag)|
+      case fmt
+      when :string
+        f.puts '    ' << const << ' = ' << invoke_llvm_config(flag).strip.inspect
+      when :array
+        f.puts '    ' << const << ' = ' << invoke_llvm_config(flag).strip.split.inspect
+      end
+    end
+
+    f.puts '  end'
+    f.puts 'end'
+  end
 end

lib/llvm/version.rb

@@ -1,23 +1,4 @@
-require 'find'
-
 module LLVM
   LLVM_VERSION = "3.2"
   RUBY_LLVM_VERSION = "3.2.0.beta.1"
-  LLVM_CONFIG = begin
-    variants = %W(llvm-config-#{LLVM_VERSION} llvm-config)
-    llvm_config = nil
-    catch :done do
-      paths = ENV['PATH'].split(File::PATH_SEPARATOR).select(&File.method(:directory?))
-      Find.find(*paths) do |path|
-        if variants.include?(File.basename(path))
-          actual_version = `#{path} --version`.chomp
-          if LLVM_VERSION == actual_version
-            llvm_config = path
-            throw(:done)
-          end
-        end
-      end
-    end
-    llvm_config
-  end
 end