Date: Wed, 15 Dec 1999 09:12:01 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Sven Sandberg <ssven DOT geo AT yahoo DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: is 'ld --wrap' not for C++?
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On Tue, 14 Dec 1999, Sven Sandberg wrote:

> -------- source file: test.cc ---------
> #include <stdlib.h>
> extern void *__real_malloc(size_t size);
> void *__wrap_malloc(int c)
> {
>    return __real_malloc(c);
> }
> int main(void)
> {
>    free(malloc(4711));
>    return 0;
> }
> -------- eof(test.cc) -----------------
> 
> command line:
>    gcc -Wl,--wrap,malloc -o test.exe test.cc -W -Wall
> 
> -------- error messages ---------------
> test.o(.text+0xe):test.cc: undefined reference to
> `__real_malloc(unsigned long)'
> test.o(.text+0x33):test.cc: undefined reference to `__wrap_malloc'

I think both __wrap_malloc and __real_malloc should be declared as
``extern "C"'' in a C++ program.