[Gllug] continuing the autoconf saga... AC_FUNC_MALLOC

[Stig Brautaset]

* Nix <nix at esperi.demon.co.uk> spake thus:
> On Sat, 29 Jun 2002, Stig Brautaset uttered the following:
> > The documentation for the AC_FUNC_MALLOC this:
> > 
> >  - Macro: AC_FUNC_MALLOC

[snip]
 
> > Regardless, the HAVE_MALLOC persists undefined in my config.h. Can
> > anyone shed any light on this?
> 
> That certainly shouldn't happen.
> 
> What version of autoconf is this?

stig at arwen:~/work/gga$ autoconf --version
autoconf (GNU Autoconf) 2.53
[snip]

Although sometimes it claims to be 2.13 (debian will not let me install
2.5X without installing 2.13 as well). I imagine it is due to some
"clever" wrapper that tries to figure out what you need or something.

> It works for me with autoconf-2.53, given a configure.ac like this:
> AC_INIT(foo,0.01)
> AC_CONFIG_HEADERS(config.h)
> AC_PROG_CC
> AC_PROG_CC_STDC
> AC_FUNC_MALLOC
> AC_OUTPUT

This works for me too. But, it wouldn't work with my configure.in --
after a bit of trial and error it turns out the AC_FUNC_MALLOC macro
does not like to be used after the AC_CHECK_LIB macro.. 

Although it is explicitly stated in the autobook that putting tests for
functions should come after tests for libraries etc.. 
Maybe it is a special case for this macro since one can load a library
to use your own malloc if it is not working? 

Thanks for the help, 

Stig

PS:	On a related note, is there any reason why you would ever want
	to do a malloc(0)? 


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