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Date: Tue, 5 Mar 2019 21:05:30 +0100
From: Markus Wichmann <nullplan@....net>
To: musl@...ts.openwall.com
Subject: Re: Asterisk 16 function redefines
On Tue, Mar 05, 2019 at 08:28:50PM +0100, Sebastian Kemper wrote:
> #define calloc(nmemb, size) \
> __ast_repl_calloc(nmemb, size, __FILE__, __LINE__, __PRETTY_FUNCTION__)
> #define malloc(size) \
> __ast_repl_malloc(size, __FILE__, __LINE__, __PRETTY_FUNCTION__)
> #define free(ptr) \
> __ast_free(ptr, __FILE__, __LINE__, __PRETTY_FUNCTION__)
>
> Compile output example:
>
> /home/sk/tmp/openwrt/staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl/include/sched.h:76:28: error: expected declaration specifiers or '...' before string constant
> void *calloc(size_t, size_t);
> ^
Welcome to the wonderful world of the preprocessor. The define above is
in effect here, so the compiler never sees the valid function prototype,
the compiler sees
void *__ast_repl_calloc(size_t, size_t, "sched.h", 76, "");
And can't deal with that. Maybe they should include the replacements as
the very last thing.
Nitpick, depending on how you feel about it: The name
"__ast_repl_calloc" starts with two underscores and is therefore in the
implementation namespace. So asterisk should keep their fingers off it!
They should just define the function without the underscores; what's so
hard about that?
> Regarding ASTMM_BLOCK: redefines libc functions to cause compile errors. [...]
And they cause compile errors. Mission accomplished.
I guess the code is tripping over the prototypes in sched.h.
> To me it looks like the mere definition sets off these errors for some
> reason. Is it about the syntax? To me it looks fine. I mean it looks
> like the syntax used for function-like macro definitions mentioned in
> the gcc manual.
>
> Again, any help appreciated.
>
These macros can't deal with prototypes. That is their failing. I don't
know how to do what they want to do, but this is probably not it. I'd
suggest going with ASTMM_IGNORE for now.
> Kind regards,
> Seb
Ciao,
Markus
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