Messages in this thread | | | Subject | Re: GCC bug ? Re: [PATCH v2 10/10] powerpc/32s: Implement Kernel Userspace Access Protection | From | Christophe Leroy <> | Date | Wed, 22 Jan 2020 07:57:15 +0100 |
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Le 21/01/2020 à 20:55, Segher Boessenkool a écrit : > On Tue, Jan 21, 2020 at 05:22:32PM +0000, Christophe Leroy wrote: >> g1() should return 3, not 5. > > What makes you say that? > > "A return of 0 does not indicate that the > value is _not_ a constant, but merely that GCC cannot prove it is a > constant with the specified value of the '-O' option." >
GCC doc also says:
"if you use it in an inlined function and pass an argument of the function as the argument to the built-in, GCC never returns 1 when you call the inline function with a string constant"
Does GCC considers (void*)0 as a string constant ?
Christophe
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