Re: nftables-20140407 compilation error

[Pablo Neira Ayuso <pablo@netfilter.org>]

On Wed, Apr 09, 2014 at 05:29:49PM +0200, Florian Westphal wrote:
> Pablo Neira Ayuso <pablo@netfilter.org> wrote:
> > > > src/scanner.o: In function `nft_realloc':
> > > > /home/nwd/lab/nftables/nftables-20140407/<stdout>:4260: undefined
> > > > reference to `rpl_realloc'
> > > 
> > > This happens when configure thinks malloc/realloc are missing.
> > > 
> > > Any objetions wrt. removing AC_FUNC_MALLOC/AC_FUNC_REALLOC from
> > > nftables configure.ac?
> > 
> > If that resolves the problem, please go ahead, thanks Florian.
> 
> The problem is two-fold.  When libnftnl has just been installed and
> is not yet in linker path, the malloc/realloc test will fail:
> 
> configure:4557: gcc -o conftest -I/usr/local/libnftnl/include
> -L/usr/local/libnftnl/lib conftest.c -lreadline -lgmp -lnftnl -lmnl  >&5
> configure:4557: $? = 0
> configure:4557: ./conftest
> ./conftest: error while loading shared libraries: libnftnl.so.0: cannot
> open shared object file: No such file or directory
>
> That error is only in config.log, and config.h redefines malloc/realloc
> with rpl_ prefix, which then yields the mysterious
> 'undefined reference to `rpl_realloc'' error when compiling nftables.
> 
> The 2nd problem is that the macro executes the built program, which has
> the usual cross-compiling issue.
> 
> AFAIU these macros are only useful to check if malloc(0) returns
> non-NULL and that realloc(NULL, .. works, hence the question if these
> should just be removed.

OK, so if we remove the macros, we may still hit the first problem,
right?

Patrick has some build updates in his queue, not sure if this removal
may clash with his changes.