Re: [Buildroot] 回复： [PATCH 1/1] toolchain/helpers.mk: add the processing when LIBPATH is a directory

["Yann E. MORIN" <yann.morin.1998@free.fr>]

JiangXin, All,

On 2023-04-24 15:56 +0800, JiangXin spake thusly:
> I build rootfs in docker container based on ubuntu22.04, host arch is x86_64.
> I chose the gcc downloaded by apt to build. 

Ah, we do not support distro toolchains, see the manual, chapter 6.1.2.
External toolchain backend:

    https://buildroot.org/downloads/manual/manual.html#external-toolchain-backend

    We also do not support using the distribution toolchain (i.e. the
    gcc/binutils/C library installed by your distribution) as the
    toolchain to build software for the target. This is because your
    distribution toolchain is not a "pure" toolchain (i.e. only with
    the C/C++ library), so we cannot import it properly into the
    Buildroot build environment.

> After the shell command in helpers.mk is excuted, the following content is output:
> root@824b1b82dfae:~/buildroot-2022.02.11# find /root/buildroot-2022.02.11/output/host/x86_64-buildroot-linux-gnu/sysroot -name
> "ld*.so.*"
> /root/buildroot-2022.02.11/output/host/x86_64-buildroot-linux-gnu/sysroot/etc/ld.so.conf.d
> /root/buildroot-2022.02.11/output/host/x86_64-buildroot-linux-gnu/sysroot/etc/ld.so.cache
> /root/buildroot-2022.02.11/output/host/x86_64-buildroot-linux-gnu/sysroot/etc/ld.so.conf
> /root/buildroot-2022.02.11/output/host/x86_64-buildroot-linux-gnu/sysroot/usr/lib/ld-linux-x86-64.so.2
> /root/buildroot-2022.02.11/output/host/x86_64-buildroot-linux-gnu/sysroot/lib/ld-linux-x86-64.so.2
> root@824b1b82dfae:~/buildroot-2022.02.11# ls -l
> /root/buildroot-2022.02.11/output/host/x86_64-buildroot-linux-gnu/sysroot/etc/ld.so.conf.d
> total 12
> -rw-r--r-- 1 root root  38 Mar  5  2022 fakeroot-x86_64-linux-gnu.conf
> -rw-r--r-- 1 root root  44 Sep 24  2021 libc.conf
> -rw-r--r-- 1 root root 100 Sep 28  2021 x86_64-linux-gnu.conf
> I added the echo on lines 753-756 of the top-level Makefile, and the build 
> log shows it doesn't get there.

This is weird, because that part should be unconditional. So, it looks
like the build may in fact not be finished successfully. Could you share
the last 50-or so last lines of the log?

> Should the processing of directories be added
> in toolchain/helpers.mk?

As I explained previously, and as confirmed above, support for
ld.so.conf should not be added, and thus the real solution is to
exclude directories in toolchain/helpers.mk line 13:

    find $(STAGING_DIR)/ -name "$${LIBPATTERN}" -not -type d 2>/dev/null

Regards,
Yann E. MORIN.

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