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instance method

MakeMakefile#have_macro

have_macro(macro, headers = nil, opt = "", &b)

# File tmp/rubies/ruby-4.1.0-preview1/lib/mkmf.rb, line 1117
def have_macro(macro, headers = nil, opt = "", &b)
  checking_for checking_message(macro, headers, opt) do
    macro_defined?(macro, cpp_include(headers), opt, &b)
  end
end

Returns whether or not macro is defined either in the common header files or within any headers you provide.

Any options you pass to opt are passed along to the compiler.

See also #have_library #have_struct_member #have_header #have_var also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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