Top Level Namespace

Defined Under Namespace

Modules: CharlockHolmes Classes: String

Instance Method Summary collapse

Instance Method Details

#libflag_to_filename(ldflag) ⇒ Object 



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# File 'ext/charlock_holmes/extconf.rb', line 78

def libflag_to_filename(ldflag)
  case ldflag
  when /\A-l(.+)/
    "lib#{Regexp.last_match(1)}.#{$LIBEXT}"
  end
end

#resolve_static_library(libflag, dirs) ⇒ Object 



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# File 'ext/charlock_holmes/extconf.rb', line 85

def resolve_static_library(libflag, dirs)
  filename = libflag_to_filename(libflag)

  dir = dirs.find { |path| File.exist?(File.join(path, filename)) }

  raise "Unable to find #{filename} in #{dirs}" unless dir

  File.join(dir, filename)
end

#substitute_static_libs(packages) ⇒ Object 



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# File 'ext/charlock_holmes/extconf.rb', line 95

def substitute_static_libs(packages)
  packages.each do |pkg|
    unless pkg_config(pkg)
      message = <<~MSG
        Unable to run `pkg-config #{pkg}`.

        Check that PKG_CONFIG_PATH includes #{pkg}.pc (or unset it if it's already set).

        Current environment:
        PKG_CONFIG_PATH=#{ENV['PKG_CONFIG_PATH']}
      MSG

      raise message
    end
  end

  # First, find all the -l<lib> flags added by pkg-config. We want to drop
  # these dynamically linked libraries and substitute them with the static libraries.
  libflags = packages.map do |pkg|
    pkg_config(pkg, 'libs-only-l')&.strip&.split(' ')
  end.flatten.uniq

  # To find where the static libraries live, we need to search the
  # library paths given by the -L flag from pkg-config.
  lib_paths = packages.map do |pkg|
    include_path = pkg_config(pkg, 'libs-only-L')&.strip
    include_path&.split(' ')&.map { |lib| lib.gsub(/^-L/, '') }
  end.flatten.uniq

  # Drop the -l<lib> flags and add in the static libraries.
  new_libs = $libs.shellsplit
  new_libs.reject! { |arg| libflags.include?(arg) }
  libflags.each { |flag| new_libs << resolve_static_library(flag, lib_paths) }
  $libs = new_libs.uniq.shelljoin
end