* musl mips fails to compile with gcc 3.4.6
@ 2012-10-10 21:51 John Spencer
2012-10-11 0:07 ` Rich Felker
0 siblings, 1 reply; 3+ messages in thread
From: John Spencer @ 2012-10-10 21:51 UTC (permalink / raw)
To: musl
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: musl mips fails to compile with gcc 3.4.6
2012-10-10 21:51 musl mips fails to compile with gcc 3.4.6 John Spencer
@ 2012-10-11 0:07 ` Rich Felker
2012-10-18 23:09 ` John Spencer
0 siblings, 1 reply; 3+ messages in thread
From: Rich Felker @ 2012-10-11 0:07 UTC (permalink / raw)
To: musl
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: musl mips fails to compile with gcc 3.4.6
2012-10-11 0:07 ` Rich Felker
@ 2012-10-18 23:09 ` John Spencer
0 siblings, 0 replies; 3+ messages in thread
From: John Spencer @ 2012-10-18 23:09 UTC (permalink / raw)
To: musl
On 10/11/2012 02:07 AM, Rich Felker wrote:
> register pthread_t self __asm__("$3");
>
> and "=r"(self) as the constraint.
yeah that compiles.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-10-10 21:51 musl mips fails to compile with gcc 3.4.6 John Spencer
2012-10-11 0:07 ` Rich Felker
2012-10-18 23:09 ` John Spencer
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