Re: [gentoo-devhelp] autotools and as-needed

[Mike Frysinger]

On Wednesday 19 August 2009 17:01:27 Thomas Kahle wrote:
> Peter Volkov wrote:
> > В Срд, 12/08/2009 в 00:03 +0200, Thomas Kahle пишет:
> >> the following check in configure.ac fails with --as-needed but works
> >> without it. Any hints what is wrong ? Thanks / Thomas
> >
> > Common reason for failure with --as-needed is the order of libraries. In
> > you previous mail you wrote that with
> >
> > sed "s/\"-lntl\"/\"-lntl\" \"-lgf2x -lntl\"/" -i "${S}/configure.ac"
> >
> > it works but here:
> >> for lib in "" "-lntl" "-lntl -lgf2x"
> >
> > I see different order. Try to change order of -lgf2x and -lntl inside
> > ebuild. Also
>
> This change of order is actually since I tried what you suggested. I
> find that this check fails just because the compile fails. It has
> nothing to do with configure. So here is my problem stripped down:
>
> $cat ntlcheck.c
> #include <NTL/tools.h>
> int main () { _ntl_GetTime(); }
>
> g++ ntlcheck.c -lntl -lgf2x
> works

this is a bug in libntl.so.  it uses gf2x symbols but doesnt link against it 
in libntl.so.  you shouldnt have to also link against libgf2x.so.
-mike