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require "compilers"
class CxxStdlib
include CompilerConstants
class CompatibilityError < StandardError
def initialize(formula, dep, stdlib)
super <<-EOS.undent
#{formula.name} dependency #{dep.name} was built with a different C++ standard
library (#{stdlib.type_string} from #{stdlib.compiler}). This may cause problems at runtime.
EOS
end
end
def self.create(type, compiler)
if type && ![:libstdcxx, :libcxx].include?(type)
raise ArgumentError, "Invalid C++ stdlib type: #{type}"
end
klass = GNU_GCC_REGEXP === compiler.to_s ? GnuStdlib : AppleStdlib
klass.new(type, compiler)
end
def self.check_compatibility(formula, deps, keg, compiler)
return if formula.skip_cxxstdlib_check?
stdlib = create(keg.detect_cxx_stdlibs.first, compiler)
begin
stdlib.check_dependencies(formula, deps)
rescue CompatibilityError => e
opoo e.message
end
end
attr_reader :type, :compiler
def initialize(type, compiler)
@type = type
@compiler = compiler.to_sym
end
# If either package doesn't use C++, all is well
# libstdc++ and libc++ aren't ever intercompatible
# libstdc++ is compatible across Apple compilers, but
# not between Apple and GNU compilers, or between GNU compiler versions
def compatible_with?(other)
return true if type.nil? || other.type.nil?
return false unless type == other.type
apple_compiler? && other.apple_compiler? ||
!other.apple_compiler? && compiler.to_s[4..6] == other.compiler.to_s[4..6]
end
def check_dependencies(formula, deps)
deps.each do |dep|
# Software is unlikely to link against libraries from build-time deps, so
# it doesn't matter if they link against different C++ stdlibs.
next if dep.build?
dep_stdlib = Tab.for_formula(dep.to_formula).cxxstdlib
if !compatible_with? dep_stdlib
raise CompatibilityError.new(formula, dep, dep_stdlib)
end
end
end
def type_string
type.to_s.gsub(/cxx$/, 'c++')
end
def inspect
"#<#{self.class.name}: #{compiler} #{type}>"
end
class AppleStdlib < CxxStdlib
def apple_compiler?
true
end
end
class GnuStdlib < CxxStdlib
def apple_compiler?
false
end
end
end
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