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Bug#1092576: linux-libc-dev: Multilib GCC bootstrap on Debian 12 fails due to missing asm/errno.h

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  Bug#1092576: linux-libc-dev: Multilib GCC bootstrap on Debian 12 fails due to missing asm/errno.h Ilya Leoshkevich <iii@linux.ibm.com> - 2025-01-09 10:10 +0100
    Bug#1092576: linux-libc-dev: Multilib GCC bootstrap on Debian 12 fails due to missing asm/errno.h Bastian Blank <waldi@debian.org> - 2025-01-15 21:20 +0100
      Bug#1092576: linux-libc-dev: Multilib GCC bootstrap on Debian 12 fails due to missing asm/errno.h Ilya Leoshkevich <iii@linux.ibm.com> - 2025-01-16 00:20 +0100
    Bug#1092576: marked as done (linux-libc-dev: Multilib GCC  bootstrap on Debian 12 fails due to missing asm/errno.h) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-01-17 17:40 +0100

#85062 — Bug#1092576: linux-libc-dev: Multilib GCC bootstrap on Debian 12 fails due to missing asm/errno.h

Package: linux-libc-dev
Version: 6.12.5-1+ppl1
Severity: normal
X-Debbugs-Cc: iii@linux.ibm.com

Dear Maintainer,

I'm trying to bootstrap gcc from git master with multilib on debian 12.
As far as I can see all the necessary cross packages are installed.

./configure && make fails with:

In file included from /usr/include/bits/errno.h:26,
                 from /usr/include/errno.h:28,
                 from ../../../../libgcc/../gcc/tsystem.h:101,
                 from ../../../../libgcc/libgcc2.c:27:
/usr/include/linux/errno.h:1:10: fatal error: asm/errno.h: No such file or directory
    1 | #include <asm/errno.h>
      |          ^~~~~~~~~~~~~

However, running ./configure with the same flags as the distro-built
GCC succeeds.

The minimal set of working options appears to be: --prefix=/usr
--build=x86_64-linux-gnu. This ultimately adds
-isystem /usr/x86_64-linux-gnu/include to the problematic GCC
invocation, which makes the issue go away.

I filed this upstream [1] and Andrew Pinski replied:

```
Looks like they changed how they handle mutli-lib with respect to multi-arch.

Before they required you to install the multiarch i386-linux-gnu too.

Now it seems like 32bit is multilibed in with the x86_64-linux-gnu.
BUT x32 is still multi-arch.

I would raise this issue with debian really because they made some changes which are break how multiarch work.
```

Best regards,
Ilya

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118369

-- System Information:
Debian Release: 12.8
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-27-amd64 (SMP w/128 CPU threads; PREEMPT)
Kernel taint flags: TAINT_SOFTLOCKUP
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

-- no debconf information

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#85148

On Thu, Jan 09, 2025 at 08:58:38AM +0000, Ilya Leoshkevich wrote:
> I'm trying to bootstrap gcc from git master with multilib on debian 12.
> As far as I can see all the necessary cross packages are installed.

How do you configure GCC to support the Debian multi-arch include
layout?  Also direct support requires Debian 13, due to linux-libc-dev
only supporting a single arch before.

For everything else, please refer to gcc packages on how to build it.

Bastian

-- 
	"What terrible way to die."
	"There are no good ways."
		-- Sulu and Kirk, "That Which Survives", stardate unknown

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#85154

On Wed, 2025-01-15 at 21:12 +0100, Bastian Blank wrote:
> On Thu, Jan 09, 2025 at 08:58:38AM +0000, Ilya Leoshkevich wrote:
> > I'm trying to bootstrap gcc from git master with multilib on debian
> > 12.
> > As far as I can see all the necessary cross packages are installed.
> 
> How do you configure GCC to support the Debian multi-arch include
> layout?  Also direct support requires Debian 13, due to linux-libc-
> dev
> only supporting a single arch before.
> 
> For everything else, please refer to gcc packages on how to build it.
> 
> Bastian

Hi Bastian,

thanks for having a look!

In the upstream ticket Matthias has figured out that the root cause is
the lack of the gcc-multilib package, which conflicts with the
cross-compilers, which are installed on the affected systems.
I believe that this, in turn, is a very old issue, which is not going
to go away anytime soon.

I tried to upgrade to debian 13, and with it I get better diagnostics
from the gcc's configure:

configure: error: I suspect your system does not have 32-bit
development libraries (libc and headers). If you have them, rerun
configure with --enable-multilib. If you do not have them, and want to
build a 64-bit-only compiler, rerun configure with --disable-multilib.

So we can close this bug.

Best regards,
Ilya

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#85172 — Bug#1092576: marked as done (linux-libc-dev: Multilib GCC bootstrap on Debian 12 fails due to missing asm/errno.h)

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Your message dated Fri, 17 Jan 2025 17:33:19 +0100
with message-id <20250117163319.qq7c6yp4zefvnvly@shell.thinkmo.de>
and subject line Re: Bug#1092576: linux-libc-dev: Multilib GCC bootstrap on Debian 12 fails due to missing asm/errno.h
has caused the Debian Bug report #1092576,
regarding linux-libc-dev: Multilib GCC bootstrap on Debian 12 fails due to missing asm/errno.h
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
1092576: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1092576
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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