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