method
have_func
ruby latest stable - Class:
Object
Method deprecated or moved
This method is deprecated or moved on the latest stable version. The last existing version (v1_9_3_392) is shown here.
have_func(func, headers = nil, &b)public
Returns whether or not the function func can be found in the common header files, or within any headers that you provide. If found, a macro is passed as a preprocessor constant to the compiler using the function name, in uppercase, prepended with ‘HAVE_’.
For example, if have_func(‘foo’) returned true, then the HAVE_FOO preprocessor macro would be passed to the compiler.
# File lib/mkmf.rb, line 892
def have_func(func, headers = nil, &b)
checking_for checking_message("#{func}()", headers) do
if try_func(func, $libs, headers, &b)
$defs.push(format("-DHAVE_%s", func.tr_cpp))
true
else
false
end
end
end