When vxcrtstuff.c was created, the set of #includes was copied from crtstuff.c. But crtstuff.c also has a bunch of #undefs after the first #include, because, as the comment says, including auto-host.h when building objects that are meant for target is technically not correct.
This manifests when I try do do a canadian cross, with build=linux, host=windows and target=vxworks, in that we pick up a #define caddr_t char * from auto-host.h, which then of course creates a problem when we later include a target header that has typedef char * caddr_t; I assume that the #undefs in crtstuff.c have been added for similar reasons. These potentially problematic #defines all seem to be guarded by #ifndef USED_FOR_TARGET, which tconfig.h defines before including auto-host.h. So at first, it seems that one could avoid the problem by simply removing the initial include of auto-host.h. Unfortunately, we do need some of the things defined in auto-host.h within such an ifndef USED_FOR_TARGET, namely the define of HAVE_INITFINI_ARRAY_SUPPORT, which is what later causes initfini-array.h to define USE_INITFINI_ARRAY. So as the next best fix, just copy the #undefs from crtstuff.c. libgcc/ * config/vxcrtstuff.c: Undefine caddr_t, pid_t, rlim_t, ssize_t and vfork after including auto-host.h. --- libgcc/config/vxcrtstuff.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/libgcc/config/vxcrtstuff.c b/libgcc/config/vxcrtstuff.c index 652a65364b0..c15e15e54e9 100644 --- a/libgcc/config/vxcrtstuff.c +++ b/libgcc/config/vxcrtstuff.c @@ -26,7 +26,15 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see #define IN_LIBGCC2 +/* FIXME: Including auto-host is incorrect, but until we have + identified the set of defines that need to go into auto-target.h, + this will have to do. */ #include "auto-host.h" +#undef caddr_t +#undef pid_t +#undef rlim_t +#undef ssize_t +#undef vfork #include "tconfig.h" #include "tsystem.h" #include "coretypes.h" -- 2.31.1