Bug#712047: libc6-dev: cannot build C programs

[Michal Suchanek <michal.suchanek@ruk.cuni.cz>]

Excerpts from Aurelien Jarno's message of Wed Jun 12 18:17:13 +0200 2013:
> tag 712047 + moreinfo
> thanks
> 
> On Wed, Jun 12, 2013 at 04:30:08PM +0200, Michal Suchanek wrote:
> > Package: libc6-dev
> > Version: 2.13-38
> > Severity: important
> > 
> > Hello,
> > 
> > I tried building a C program with libc-dev installed.
> > 
> > The program would not build because headers were missing:
> > 
> > libc6-dev-i386: /usr/include/bits
> 
> You don't need this one, your compiler should look into
> /usr/include/x86_64-linux-gnu/bits.
> 
> > libc6-dev:amd64: /usr/include/x86_64-linux-gnu/bits/predefs.h
> 
> This is libc6-dev the package you are reporting the bug against,
> so it can't be missing.

No, it's just wrong place.

> 
> > linux-libc-dev:amd64: /usr/include/x86_64-linux-gnu/asm/errno.h
> 
> libc6-dev already depends on this one.
> 
> > gcc-multilib: /usr/include/asm
> 
> You don't need this one, your compiler should already lokk into 
> /usr/include/x86_64-linux-gnu/asm.

It does not.

> > 
> > For the asm/errno.h (referenced from common header) to be present gcc-multilib must be installed.
> > 
> > Similarily for bits/predefs.h to be present libc6-dev-i386 must be installed.
> > 
> > The libc6-dev package is incomplete and cannot stand on its own.
> > 
> > Dependency on gcc-multilib is bogus. It requires specific version of gcc installed.
> > 
> > Also, libc6-dev does not depend on these packages.
> > 
> > Please make a libc package against which C programs do compile.
> 
> This is what libc6-dev is for. Please provide examples which do not
> work.
> 

I found the setting that shows compile commands and the makefile uses
-m32 compiler flag. That clearly requires the 32bit headers and the
extra symlink provided by the 32bit headers is probably just a red herring.

Sorry about the noise.


Thanks

Michal