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Message-ID: <20140506101410.GP12324@port70.net>
Date: Tue, 6 May 2014 12:14:10 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: Linking musl with ld.gold
* Stephen Thomas <scjthm@...e.com> [2014-05-06 10:07:59 +0100]:
> I have come across a problem and it only appears when the gold linker is used. I am using the latest release of binutils, binutils-2.24.51.0.3.
> I discovered that busybox was not flushing stdout (as there was no prompt appearing) when using musl. Busybox calls fflush(NULL) which should flush stdout as done in src/stdio/fflush.c.
> In that file I checked the value for __stdout_used and it came back as 0. So I changed the declaration of the weak symbol to an extern FILE* __stdout_used and stdout was being flushed.
> Has anyone else seen this and have they reported this apparent bug in binutils?
i think we only reported a broken tls visibility issue against gold
https://sourceware.org/bugzilla/show_bug.cgi?id=16728
you should try to reproduce the bug on a minimal example, eg. the
following code works here with gold (binutils 2.22)
// a.c
struct foo {int i;};
static struct foo *const dummy = 0;
extern struct foo *const hasfoo __attribute__((weak, alias("dummy")));
int f(void)
{
return hasfoo ? hasfoo->i : 0;
}
// b.c
struct foo {int i;};
static struct foo foo = {42};
struct foo *const hasfoo = &foo;
// main.c
int f(void);
int main()
{
return f();
}
gcc main.o a.o -o t1
gcc main.o a.o b.o -o t2
./t1 returns 0
./t2 returns 42
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