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module CompilerConstants
GNU_GCC_VERSIONS = 3..9
GNU_GCC_REGEXP = /^gcc-(4\.[3-9])$/
end
# TODO make this class private to CompilerSelector
class Compiler
attr_reader :name, :version, :priority
def initialize(name, version=0, priority=0)
@name = name
@version = version
@priority = priority
end
end
class CompilerFailure
attr_reader :name
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
def self.for_standard standard
COLLECTIONS.fetch(standard) do
raise ArgumentError, "\"#{standard}\" is not a recognized standard"
end
end
def self.create(spec, &block)
# Non-Apple compilers are in the format fails_with compiler => version
if spec.is_a?(Hash)
_, major_version = spec.each { |e| break e }
name = "gcc-#{major_version}"
# so fails_with :gcc => '4.8' simply marks all 4.8 releases incompatible
version = "#{major_version}.999"
else
name = spec
version = 9999
end
new(name, version, &block)
end
def initialize(name, version, &block)
@name = name
@version = version
instance_eval(&block) if block_given?
end
def ===(compiler)
name == compiler.name && version >= compiler.version
end
def inspect
"#<#{self.class.name}: #{name} #{version}>"
end
MESSAGES = {
:cxx11 => "This compiler does not support C++11"
}
cxx11 = proc { cause MESSAGES[:cxx11] }
COLLECTIONS = {
:cxx11 => [
create(:gcc_4_0, &cxx11),
create(:gcc, &cxx11),
create(:llvm, &cxx11),
create(:clang) { build 425; cause MESSAGES[:cxx11] },
create(:gcc => "4.3", &cxx11),
create(:gcc => "4.4", &cxx11),
create(:gcc => "4.5", &cxx11),
create(:gcc => "4.6", &cxx11),
],
:openmp => [
create(:clang) { cause "clang does not support OpenMP" },
]
}
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
while cc = @compilers.pop
return cc.name unless @f.fails_with?(cc)
end
raise CompilerSelectionError.new(@f)
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
end
end
end
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