138 lines
3.5 KiB
Ruby
138 lines
3.5 KiB
Ruby
module CompilerConstants
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GNU_GCC_VERSIONS = 3..9
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GNU_GCC_REGEXP = /gcc-(4\.[3-9])/
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end
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class Compiler < Struct.new(:name, :version, :priority)
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# The major version for non-Apple compilers. Used to indicate a compiler
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# series; for instance, if the version is 4.8.2, it would return "4.8".
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def major_version
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version.match(/(\d\.\d)/)[0] if name.is_a? String
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end
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end
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class CompilerFailure
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attr_reader :compiler, :major_version
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attr_rw :cause, :version
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# Allows Apple compiler `fails_with` statements to keep using `build`
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# even though `build` and `version` are the same internally
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alias_method :build, :version
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MESSAGES = {
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:cxx11 => 'This compiler does not support C++11'
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}
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COLLECTIONS = {
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:cxx11 => [
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[:gcc_4_0, proc { cause MESSAGES[:cxx11] }],
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[:gcc, proc { cause MESSAGES[:cxx11] }],
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[:llvm, proc { cause MESSAGES[:cxx11] }],
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[:clang, proc { build 425; cause MESSAGES[:cxx11] }],
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[{:gcc => '4.3'}, proc { cause MESSAGES[:cxx11] }],
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[{:gcc => '4.4'}, proc { cause MESSAGES[:cxx11] }],
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[{:gcc => '4.5'}, proc { cause MESSAGES[:cxx11] }],
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[{:gcc => '4.6'}, proc { cause MESSAGES[:cxx11] }]
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],
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:openmp => [
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[:clang, proc { cause 'clang does not support OpenMP' }]
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]
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}
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def self.for_standard standard
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failures = COLLECTIONS.fetch(standard) do
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raise ArgumentError, "\"#{standard}\" is not a recognized standard"
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end
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failures.map do |compiler, block|
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CompilerFailure.new(compiler, &block)
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end
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end
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def initialize compiler, &block
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instance_eval(&block) if block_given?
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# Non-Apple compilers are in the format fails_with compiler => version
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if compiler.is_a? Hash
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# currently the only compiler for this case is GCC
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_, @major_version = compiler.first
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@compiler = 'gcc-' + @major_version
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# so fails_with :gcc => '4.8' simply marks all 4.8 releases incompatible
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@version ||= @major_version + '.999'
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else
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@compiler = compiler
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@version ||= 9999
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@version = @version.to_i
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end
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end
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end
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class CompilerQueue
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def initialize
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@array = []
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end
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def <<(o)
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@array << o
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self
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end
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def pop
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@array.delete(@array.max { |a, b| a.priority <=> b.priority })
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end
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def empty?
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@array.empty?
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end
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end
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class CompilerSelector
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def initialize(f, versions=MacOS)
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@f = f
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@versions = versions
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@compilers = CompilerQueue.new
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%w{clang llvm gcc gcc_4_0}.map(&:to_sym).each do |cc|
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version = @versions.send("#{cc}_build_version")
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unless version.nil?
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@compilers << Compiler.new(cc, version, priority_for(cc))
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end
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end
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# non-Apple GCC 4.x
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CompilerConstants::GNU_GCC_VERSIONS.each do |v|
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name = "gcc-4.#{v}"
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version = @versions.non_apple_gcc_version(name)
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unless version.nil?
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# priority is based on version, with newest preferred first
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@compilers << Compiler.new(name, version, 1.0 + v/10.0)
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end
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end
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end
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# Attempts to select an appropriate alternate compiler, but
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# if none can be found raises CompilerError instead
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def compiler
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begin
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cc = @compilers.pop
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end while @f.fails_with?(cc)
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if cc.nil?
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raise CompilerSelectionError.new(@f)
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else
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cc.name
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end
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end
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private
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def priority_for(cc)
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case cc
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when :clang then @versions.clang_build_version >= 318 ? 3 : 0.5
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when :gcc then 2.5
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when :llvm then 2
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when :gcc_4_0 then 0.25
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# non-Apple gcc compilers
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else 1.5
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end
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end
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end
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