https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106680
--- Comment #13 from Sebastian Huber <sebastian.hu...@embedded-brains.de> --- (In reply to Kewen Lin from comment #12) > (In reply to Sebastian Huber from comment #10) > > (In reply to Kewen Lin from comment #9) > > > Note that now we only disable implicit powerpc64 for -m32 when the > > > OS_MISSING_POWERPC64 is set. > > > > > > /* Don't expect powerpc64 enabled on those OSes with > > > OS_MISSING_POWERPC64, > > > since they do not save and restore the high half of the GPRs > > > correctly > > > in all cases. If the user explicitly specifies it, we won't > > > interfere > > > with the user's specification. */ > > > #ifdef OS_MISSING_POWERPC64 > > > if (OS_MISSING_POWERPC64 > > > && TARGET_32BIT > > > && TARGET_POWERPC64 > > > && !(rs6000_isa_flags_explicit & OPTION_MASK_POWERPC64)) > > > rs6000_isa_flags &= ~OPTION_MASK_POWERPC64; > > > #endif > > > > > > But rtems.h doesn't define OS_MISSING_POWERPC64 > > > > RTEMS supports the 64-bit PowerPC for the 64-bit multilibs. > > > > 64-bit kernel should support 64-bit PowerPC, but does 32-bit kernel support > saving and restoring 64-bit regs? For the 32-bit multilibs, we don't save/restore the full 64-bit registers. > > The current rtems.h is saying yes, if it's no, we should fix the rtems.h and > you won't need the explicit -mno-powerpc64 then. > > > btw, take the comments in freebsd64.h for example. > > /* FreeBSD doesn't support saving and restoring 64-bit regs with a 32-bit > kernel. This is supported when running on a 64-bit kernel with > COMPAT_FREEBSD32, but tell GCC it isn't so that our 32-bit binaries > are compatible. */ > #define OS_MISSING_POWERPC64 !TARGET_64BIT Thanks for the hint, I will try out this setting.
