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Date: Thu, 01 Aug 2013 10:26:55 +0200
From: Jens Gustedt <jens.gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: Re: Solving the recursive memcpy/memset/etc. issue
Am Donnerstag, den 01.08.2013, 10:03 +0200 schrieb Luca Barbato:
> > Well, it would be an ugly heuristic like running cc -S -o - on
> > src/string/memcpy.c, with -Dmemcpy=noname or something, and grepping
> > the output for memcpy...
>
> Indeed.
there might be the word memcpy in comments or whatever, depends on the
assembler format etc. might be really relatively difficult to set up
reliably.
Other options:
- compile it with that -Dmemcpy=noname trick to a normal .o and use
nm to look for an undefined symbol "memcpy".
- use a different name for the implementation of the function from
the start, __musl_memcpy or so. Then you could do the check for the
memcpy symbol on the normally compiled .o and (if everything is ok)
rename the __musl_memcpy to memcpy with some linker trick.
- put "#define memcpy __musl_memcpy" at the start of string.h
if __musl_memcpy would refer to memcpy this would give an link time
error for an undefined symbol.
Jens
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