On Tue, 19 Mar 2024, Jakub Jelinek wrote: > On Sat, Jul 20, 2019 at 05:26:57PM +0100, Richard Sandiford wrote: > > Gerald Pfeifer <ger...@pfeifer.com> writes: > > > I have seen an increasing number of reports of GCC failing to > > > build with clang on powerpc (on FreeBSD, though that's probably > > > immaterial). > > > > > > Turns out that clang has vec_step as a reserved word on powerpc > > > with AltiVec. > > > > > > We OTOH use vec_step s as a variable name in gcc/tree-vect-loop.c. > > > > > > > > > The best approach I can see is to rename vec_step. Before I prepare > > > a patch: what alternate name/spelling would you prefer? > > > > Would it work to #define vec_step to vec_step_ or something on affected > > hosts, say in system.h? > > > > I'd prefer that to renmaing since "vec_step" does seem the most natural > > name for the variable. The equivalent scalar variable is "step" and > > other vector values in the surrounding code also use the "vec_" prefix. > > So like this?
Works for me, but would #undef vec_step work or is it really a keyword in the clang side? Thanks, Richard. > If/when clang finally fixes https://github.com/llvm/llvm-project/issues/85579 > on their side, we can then limit it to clang versions which still have the > bug. > > I've git grepped for vec_set and appart from altivec.h it is just used in > tree-vect-loop.cc, some Ada files which aren't preprocessed, ChangeLogs, > rs6000-vecdefines.h (but that header is only included from altivec.h and > vec_step is then redefined to the function-like macro) and in > rs6000-overload.def > but that file is processed with a generator, not included in C/C++ sources. > > 2024-03-19 Jakub Jelinek <ja...@redhat.com> > > PR bootstrap/114369 > * system.h (vec_step): Define to vec_step_ when compiling > with clang on PowerPC. > > --- gcc/system.h.jj 2024-03-08 09:07:29.484624793 +0100 > +++ gcc/system.h 2024-03-19 11:39:18.122700551 +0100 > @@ -1302,6 +1302,12 @@ void gcc_stablesort_r (void *, size_t, s > #define NULL nullptr > #endif > > +/* Workaround clang on PowerPC which has vec_step as reserved keyword > + rather than function-like macro defined in <altivec.h>. See PR114369. */ > +#if defined(__clang__) && defined(__powerpc__) > +#define vec_step vec_step_ > +#endif > + > /* Return true if STR string starts with PREFIX. */ > > inline bool > > > Jakub > > -- Richard Biener <rguent...@suse.de> SUSE Software Solutions Germany GmbH, Frankenstrasse 146, 90461 Nuernberg, Germany; GF: Ivo Totev, Andrew McDonald, Werner Knoblich; (HRB 36809, AG Nuernberg)
