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# @private
module CompilerConstants
GNU_GCC_VERSIONS = %w[4.3 4.4 4.5 4.6 4.7 4.8 4.9 5 6 7].freeze
GNU_GCC_REGEXP = /^gcc-(4\.[3-9]|[5-7])$/
COMPILER_SYMBOL_MAP = {
"gcc-4.0" => :gcc_4_0,
"gcc-4.2" => :gcc,
"clang" => :clang,
}.freeze
COMPILERS = COMPILER_SYMBOL_MAP.values +
GNU_GCC_VERSIONS.map { |n| "gcc-#{n}" }
end
class CompilerFailure
attr_reader :name
attr_rw :version
# Allows Apple compiler `fails_with` statements to keep using `build`
# even though `build` and `version` are the same internally
alias build version
# The cause is no longer used so we need not hold a reference to the string
def cause(_); end
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.first
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
COLLECTIONS = {
cxx11: [
create(:gcc_4_0),
create(:gcc),
create(:clang) { build 425 },
create(gcc: "4.3"),
create(gcc: "4.4"),
create(gcc: "4.5"),
create(gcc: "4.6"),
],
openmp: [
create(:clang),
],
}.freeze
end
class CompilerSelector
include CompilerConstants
Compiler = Struct.new(:name, :version)
COMPILER_PRIORITY = {
clang: [:clang, :gcc, :gnu, :gcc_4_0],
gcc: [:gcc, :gnu, :clang, :gcc_4_0],
gcc_4_0: [:gcc_4_0, :gcc, :gnu, :clang],
}.freeze
def self.select_for(formula, compilers = self.compilers)
new(formula, DevelopmentTools, compilers).compiler
end
def self.compilers
COMPILER_PRIORITY.fetch(DevelopmentTools.default_compiler)
end
attr_reader :formula, :failures, :versions, :compilers
def initialize(formula, versions, compilers)
@formula = formula
@failures = formula.compiler_failures
@versions = versions
@compilers = compilers
end
def compiler
find_compiler { |c| return c.name unless fails_with?(c) }
raise CompilerSelectionError, formula
end
private
def find_compiler
compilers.each do |compiler|
case compiler
when :gnu
GNU_GCC_VERSIONS.reverse_each do |v|
name = "gcc-#{v}"
version = compiler_version(name)
yield Compiler.new(name, version) if version
end
when :llvm
# no-op. DSL supported, compiler is not.
else
version = compiler_version(compiler)
yield Compiler.new(compiler, version) if version
end
end
end
def fails_with?(compiler)
failures.any? { |failure| failure === compiler }
end
def compiler_version(name)
case name
when GNU_GCC_REGEXP
versions.non_apple_gcc_version(name)
else
versions.send("#{name}_build_version")
end
end
end
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