[mercury-users] Re-definition of malloc

[Julien Fischer]

On Wed, 21 Jun 2006, Jonathan Morgan wrote:

> When trying to build the curs samples under Linux (Fedora Core 3,
> mercury-0.12.0), I get the following errors.
>
> /usr/lib/gcc/i386-redhat-linux/3.4.2/../../../libc.a(malloc.o)(.text+0x1380):
> In function `free':
> : multiple definition of `free'
> Mercury/os/curs.o(.text+0x1800): first defined here
> /usr/bin/ld: Warning: size of symbol `free' changed from 9 in
> Mercury/os/curs.o to 175 in
> /usr/lib/gcc/i386-redhat-linux/3.4.2/../../../libc.a(malloc.o)
> /usr/lib/gcc/i386-redhat-linux/3.4.2/../../../libc.a(malloc.o)(.text+0x2c70):
> In function `malloc':
> : multiple definition of `malloc'
> Mercury/os/curs.o(.text+0x17b8): first defined here
> /usr/bin/ld: Warning: size of symbol `malloc' changed from 9 in
> Mercury/os/curs.o to 373 in
> /usr/lib/gcc/i386-redhat-linux/3.4.2/../../../libc.a(malloc.o)
> /usr/lib/gcc/i386-redhat-linux/3.4.2/../../../libc.a(malloc.o)(.text+0x30a0):
> In function `realloc':
> : multiple definition of `realloc'
> Mercury/os/curs.o(.text+0x17f4): first defined here
> /usr/bin/ld: Warning: size of symbol `realloc' changed from 9 in
> Mercury/os/curs.o to 531 in
> /usr/lib/gcc/i386-redhat-linux/3.4.2/../../../libc.a(malloc.o)
> collect2: ld returned 1 exit status
> gmake: *** [demo] Error 1
>
> I presume that the problem is with the following code, re-defining
> *alloc in terms of GC_*ALLOC.  Does anyone have any suggestions?

It looks like ld on that system is configured to treat multiple
definitions as a fatal error.  You'll need to tell it that it isn't.
Something like the following at a guess:

	EXTRA_LDFLAGS=--allow-multiple-definitions


Julien.
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