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Date: Mon, 14 Jan 2013 12:45:27 +0400
From: Vasily Kulikov <>
Subject: musl as a framework to test applications' compatibility with POSIX
 (was: NULL)


On Mon, Jan 14, 2013 at 01:11 -0500, Rich Felker wrote:
> In any case, this thread has gotten WAY off-topic, going all over the
> place into territory about the merits and demerits of different
> languages and anti-FSF politics. Those topics may be worth discussing
> in some contexts, but it seems to have left everybody really confused
> about the issues at hand, which are:
> - whether we should work around broken programs that pass NULL to
>   variadic functions
> - and if so, how
> The emerging consensus seems to be using
> #define NULL 0L
> unconditionally in both C and C++ mode.

If such slick and unobvious places of C/POSIX/C++/gcc/etc. applications
are explicitly detected and handled, then probably it worth implementing
some checker in libc/toolchain which is detected (probably at runtime)
and warning is emitted at runtime/compile-time?  gcc'isms, UBs, etc.

In musl libc it can be implemented as -DI_WANT_TO_DETECT_GCCISMS.


Vasily Kulikov - bringing security into open computing environments

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