Re: How to set sysroot for cross compiling?

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Kai Ruottu kirjoitti 10.8.2023 klo 14.15:
unlvsur unlvsur kirjoitti 6.8.2023 klo 23.35:

x86_64-ubuntu-linux-gnu-g++ -v

Using built-in specs.

COLLECT_GCC=x86_64-ubuntu-linux-gnu-g++

COLLECT_LTO_WRAPPER=/home/cqwrteur/toolchains/x86_64-pc-linux-gnu/x86_64-ubuntu-linux-gnu/libexec/gcc/x86_64-ubuntu-linux-gnu/14.0.0/lto-wrapper

Target: x86_64-ubuntu-linux-gnu

<snip>

gcc version 14.0.0 20230802 (experimental) (GCC)

Arsen Arsenović via Gcc-help kirjoitti 3.8.2023 klo 13.06:

> unlvsur unlvsur <unlvsur@xxxxxxxx> writes:
>
>> i do set with multilib list, the problem is that gcc gets very messed up when >> trying to find where the libs located at build. So the target was Ubuntu...

Last when I tried this target there weren't the 'x32' libraries, only the 32- and 64-bit ones. So maybe it was the time to try a newer Ubuntu target. The "22.04.2" seemed to be suitable
to try.
As you told, the target headers and libraries seemed to be a big mess when looking in which packages they were delivered. The "Desktop" release ISO-package seemed to provide only a subset and one needed to look at the "pool/main" archives. The Ubuntu mirror in Finland had even this somehow "stripped" because I got this error when trying gcc-11.4.0 for
the 'x86_64-ubuntu-linux22.04' target :

In file included from /opt/host-x86_64-ubuntu-linux22.04/usr/include/bits/errno.h:26,                  from /opt/host-x86_64-ubuntu-linux22.04/usr/include/errno.h:28,
                 from ../../../../libgcc/../gcc/tsystem.h:93,
                 from ../../../../libgcc/libgcc2.c:27:
/opt/host-x86_64-ubuntu-linux22.04/usr/include/linux/errno.h:1:10: fatal error: asm/errno.h: No such file or directory
    1 | #include <asm/errno.h>
      |          ^~~~~~~~~~~~~
compilation terminated.

The 'kernel headers' were from the two 'linux-libc-dev_5.15.0-78.85_*.deb' packages but something was missing for the '-mx32' case. Earlier there were a faulty symlink to '/lib/ld-linux.so.2' or what the 32-bit one is. Of course this shouldn't be to the absolute '/lib' but to the relative '../lib'. And all the 32-bit headers were missing, the desktop-image providing only a 'linux-libc-dev_5.15.0-60.66_amd64.deb' package for which the 'linux-libc-dev_5.15.0-60.66_i386.deb' equivalent wasn't found. Therefore using the '78.85' packages. Let's see whether the found 'linux-headers-5.15.0-78-generic_5.15.0-78.85_amd64.deb'
has all the required headers...

This problem seemed being seen earlier by others. And the solution being one kind of "hack" :
"Try installing |gcc-multilib|
@doug that's *the* solution. Funnily enough, all this package contains is a symlink||
|/usr/include/asm -> x86_64-linux-gnu/asm|.
If you post this as an answer, I'll accept it."
https://askubuntu.com/questions/959279/what-package-provides-asm-errno-h-for-x32-abi

The options used to configure the original Ubuntu 22.04 GCC which I partly copied without first reasearching what they will do caused more errors during the build. Like the missing
'include/crypt.h' when the provided target libs didn't have zlib.



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