Re: const versus __attribute__((const))

From: H. Peter Anvin
Date: Tue Dec 09 2003 - 10:46:57 EST


Arnd Bergmann wrote:

For reference, both gcc-3.3 and gcc-3.4 (snapshot) give produce the same assembly as gcc-3.2 for your code, but give this warning:

test.c:6: warning: use of memory input without lvalue in asm operand 1 is deprecated
test.c:7: warning: use of memory input without lvalue in asm operand 1 is deprecated


In some ways, this is rather unfortunate, too. What it really means is that the gcc "m" constraint is overloaded; it would have been better if they would have created a new modifier (say "*") for "must be lvalue."

-hpa

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