On 09/20/2012 06:47 PM, Ian Lance Taylor wrote:
On Thu, Sep 20, 2012 at 7:23 AM, Florian Weimer <fweimer@xxxxxxxxxx> wrote:
I would like to generate a deprecation warning for macros. In the header
file, I would like to have:
#define FOO 127
/* do something with FOO to mark it deprecated */
And in client code which includes the header,
printf("%d", FOO);
should print a compile-time warning. Is this possible without changing GCC
itself?
I don't think so. We have deprecated attributes for functions,
variables, and types, but there is no notion of an attribute for
macros, and there is no support for marking a macro as deprecated.
Thanks for checking.
I've submitted a patch for issuing arbitrary diagnostics from macros:
<http://gcc.gnu.org/ml/gcc-patches/2012-09/msg01710.html>
This would provide a reasonable approximation. Adding machinery to keep
a deprecation message without increasing storage requirements for all
macros would have been a bit more involved.
--
Florian Weimer / Red Hat Product Security Team
