method

have_const

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have_const(const, headers = nil, opt = "", &b) public

Returns whether or not the constant const is defined. You may optionally pass the type of const as [const, type], such as:

have_const(%w[PTHREAD_MUTEX_INITIALIZER pthread_mutex_t], "pthread.h")

You may also pass additional headers to check against in addition to the common header files, and additional flags to opt which are then passed along to the compiler.

If found, a macro is passed as a preprocessor constant to the compiler using the type name, in uppercase, prepended with HAVE_CONST_.

For example, if have_const(‘foo’) returned true, then the HAVE_CONST_FOO preprocessor macro would be passed to the compiler.

Show source

# File lib/mkmf.rb, line 1253
  def have_const(const, headers = nil, opt = "", &b)
    checking_for checking_message([*const].compact.join(' '), headers, opt) do
      try_const(const, headers, opt, &b)
    end
  end

have_const

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