method
have_header
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_header(header, preheaders = nil, &b)public
Returns whether or not the given header file can be found on your system. If found, a macro is passed as a preprocessor constant to the compiler using the header file name, in uppercase, prepended with ‘HAVE_’.
For example, if have_header(‘foo.h’) returned true, then the HAVE_FOO_H preprocessor macro would be passed to the compiler.
# File lib/mkmf.rb, line 929
def have_header(header, preheaders = nil, &b)
checking_for header do
if try_header(cpp_include(preheaders)+cpp_include(header), &b)
$defs.push(format("-DHAVE_%s", header.tr_cpp))
true
else
false
end
end
end