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Date: Wed, 10 Oct 2012 20:07:39 -0400
From: Rich Felker <dalias@...ifal.cx>
To: musl@...ts.openwall.com
Subject: Re: musl mips fails to compile with gcc 3.4.6
On Wed, Oct 10, 2012 at 11:51:25PM +0200, John Spencer wrote:
> src/aio/aio_readwrite.c: In function `io_thread':
> ../arch/mips/pthread_arch.h:7: error: impossible constraint in `asm'
> __asm__ __volatile__ (".word 0x7c03e83b" : "=v" (self) );
>
>
> #ifdef __clang__
>
> -->
>
> #if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ < 4))
>
> fixes it
I have a potential alternate fix: using
register pthread_t self __asm__("$3");
and "=r"(self) as the constraint. This should work on any gcc version
without incurring the extra cost of the clang-workaround. And it will
work with clang too if they ever fix their register allocator to work
with this kind of code.
Can you confirm whether or not it works?
Rich
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