Re: [PATCH] Fix immediate asm constraint for gcc 3 x86_64

From: H. Peter Anvin
Date: Fri May 16 2008 - 17:36:21 EST


Mathieu Desnoyers wrote:


It seems that include/asm-x86/immediate.h in sched-devel.git causes
this. gcc-3.4 does not seem to like the "i" (&name##__imv) constraint. I
have seen no such problem with gcc-4.1. This is weird. It seems that
relaxing the constraint helps fixing this, but it's not clear whether
fixing the code or gcc-3.4 is the correct solution... here is the fix :

Fix immediate asm constraint for gcc 3 x86_64


It might make it compile, but it's completely *wrong* for the purpose intended.

It permits gcc to present the address in a register, for example, so there is no guarantee that you end up with an immediate.

-hpa
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