require "mkmf"

if RUBY_ENGINE != "ruby"
  STDERR.puts("\n\n***** This gem is MRI-specific. It does not support #{RUBY_ENGINE}. *****\n\n")
  exit(1)
end

if Gem::Version.new(RUBY_VERSION) < Gem::Version.new('2.4.0')
  STDERR.puts("\n\n***** Ruby version #{RUBY_VERSION} is no longer supported. Please upgrade to 2.3 or higher. *****\n\n")
  exit(1)
end

# For the love of bitfields...
$CFLAGS += ' -std=c99'

# And since we are using C99
CONFIG['warnflags'].gsub!('-Wdeclaration-after-statement', '')

def add_define(name, value = nil)
  if value
    $defs.push("-D#{name}=#{value}")
  else
    $defs.push("-D#{name}")
  end
end

def windows?
  RbConfig::CONFIG['host_os'] =~ /mswin|mingw/
end

add_define("RUBY_PROF_RUBY_VERSION", RUBY_VERSION.split('.')[0..2].inject(0){|v,d| v*100+d.to_i})

# This function was added in Ruby 2.5, so once Ruby 2.4 is no longer supported this can be removed
have_func('rb_tracearg_callee_id', ["ruby.h"])

create_makefile("ruby_prof")