From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Subject: Re: some odd library loading errors
Date: Tue, 17 Nov 2015 16:23:56 +0100 [thread overview]
Message-ID: <20151117152355.GF18372@port70.net> (raw)
In-Reply-To: <20151117121429.GI26951@example.net>
* u-uy74@aetey.se <u-uy74@aetey.se> [2015-11-17 13:14:29 +0100]:
> The environment:
> Linux 3.# on x#86
> binutils 2.24
> musl 1.1.8 compiled for i486
> gcc 5.2.0
>
> (the gcc has arch=i486 as the default)
>
> No oddities were observed with the above until trying to use libatomic
> which is provided by gcc-5.2.0.
>
> The test case:
>
> $ cat >a.c <<____
> int main(){ return 0; }
> ____
>
> $ gcc -o a a.c -L<path-to-gcc-5.2.0-libs> -latomic
>
> $ LD_LIBRARY_PATH=<path-to-gcc-5.2.0-libs> ./a
> Error relocating <path-to-gcc-5.2.0-libs>/libatomic.so.1: __atomic_store_8: symbol not found
> Error relocating <path-to-gcc-5.2.0-libs>/libatomic.so.1: __atomic_exchange_8: symbol not found
> Error relocating <path-to-gcc-5.2.0-libs>/libatomic.so.1: __atomic_load_8: symbol not found
> Error relocating <path-to-gcc-5.2.0-libs>/libatomic.so.1: __atomic_compare_exchange_8: symbol not found
>
this is a known issue, they use the gnu ifunc extension of
elf to dispatch between different implementations based on
the machine at library loadtime.
> I would appreciate help with finding out who is doing wrong:
> - gcc
> - ld
> - musl
> - myself
> and what is to be corrected to make it work.
>
build gcc with --disable-gnu-indirect-function
(then i guess libatomic will always use the
portable implementation.)
next prev parent reply other threads:[~2015-11-17 15:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-17 12:14 u-uy74
2015-11-17 15:23 ` Szabolcs Nagy [this message]
2015-11-17 15:27 ` Rich Felker
2015-11-17 15:45 ` Szabolcs Nagy
2015-11-17 15:55 ` Rich Felker
2015-11-17 16:34 ` Szabolcs Nagy
2015-11-17 17:13 ` Rich Felker
2015-11-17 15:42 ` u-uy74
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