Method: MakeMakefile#try_const

Defined in:
lib/mkmf.rb

#try_const(const, headers = nil, opt = "", &b) ⇒ Object

Returns whether or not the constant const is defined.

See also have_const



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# File 'lib/mkmf.rb', line 1287

def try_const(const, headers = nil, opt = "", &b)
  const, type = *const
  if try_compile(<<"SRC", opt, &b)
#{cpp_include(headers)}
/*top*/
typedef #{type || 'int'} conftest_type;
conftest_type conftestval = #{type ? '' : '(int)'}#{const};
SRC
    $defs.push(format("-DHAVE_CONST_%s", const.tr_cpp))
    true
  else
    false
  end
end