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From: Florian Weimer <fweimer@redhat.com>
To: George Hodgkins via Libc-help <libc-help@sourceware.org>
Cc: George Hodgkins <hodgkinsgeorge@gmail.com>
Subject: Re: Diagnosing symbol conflicts in modified glibc build
References: <CA+U-CbyxhrCBy-tWbctqDchg3G-8CjwV94sWtPXTYZ_9kiwoAg@mail.gmail.com>
Date: Wed, 23 Jun 2021 22:35:48 +0200
In-Reply-To: <CA+U-CbyxhrCBy-tWbctqDchg3G-8CjwV94sWtPXTYZ_9kiwoAg@mail.gmail.com>
 (George Hodgkins via Libc-help's message of "Wed, 23 Jun 2021 14:03:05
 -0600")
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* George Hodgkins via Libc-help:

> With that extensive preamble, the actual problem we are facing is the
> failure of this command:
> #################
> cc   -nostdlib -nostartfiles -r -o /glibc-wsp/build/elf/librtld.map.o
> -Wl,--defsym=calloc=0 -Wl,--defsym=free=0 -Wl,--defsym=malloc=0
> -Wl,--defsym=realloc=0 -Wl,--defsym=__stack_chk_fail=0
> -Wl,--defsym=__stack_chk_fail_local=0 \
>         '-Wl,-(' /glibc-wsp/build/elf/dl-allobjs.os
> /glibc-wsp/build/libc_pic.a -lgcc '-Wl,-)'
> -Wl,-Map,/glibc-wsp/build/elf/librtld.mapT
> /glibc-wsp/build/libc_pic.a(getcwd.os): In function `__GI___getcwd':
> /glibc-wsp/src/io/../sysdeps/unix/sysv/linux/getcwd.c:47: multiple
> definition of `__getcwd'
> /glibc-wsp/build/elf/dl-allobjs.os:/glibc-wsp/src/elf/../sysdeps/unix/sysv/linux/getcwd.c:47:
> first defined here

This probably means that you are linking more into the dynamic loader
than you intend.  You may have to cover your own additions with
#if IS_IN (libc) or #if !IS_IN (rtld).

Thanks,
Florian