Hello, I order to prepare for inclusion of gccgo to GNU/Hurd split stack support has been proposed, and in reality this patch has been applied to Debian since gcc-6.
Please commit this patch. Late on updated patches for gccgo in gcc-8 and gcc-9? will be reviewed and committed with the aid of Ian Lance Taylor and Matthis Klose. Thanks!
gcc/config/ChangeLog 2018-10-10 Svante Signell <svante.sign...@gmail.com> * gcc/config/i386/gnu.h: Enable split-stack support Index: gcc-snapshot-20181019-1.1/src/gcc/config/i386/gnu.h =================================================================== --- gcc-snapshot-20181019-1.1.orig/src/gcc/config/i386/gnu.h +++ gcc-snapshot-20181019-1.1/src/gcc/config/i386/gnu.h @@ -37,11 +37,14 @@ along with GCC. If not, see <http://www #ifdef TARGET_LIBC_PROVIDES_SSP -/* Not supported yet. */ -# undef TARGET_THREAD_SSP_OFFSET - -/* Not supported yet. */ -# undef TARGET_CAN_SPLIT_STACK -# undef TARGET_THREAD_SPLIT_STACK_OFFSET +/* i386 glibc provides __stack_chk_guard in %gs:0x14. */ +#define TARGET_THREAD_SSP_OFFSET 0x14 +/* We only build the -fsplit-stack support in libgcc if the + assembler has full support for the CFI directives. */ +#if HAVE_GAS_CFI_PERSONALITY_DIRECTIVE +#define TARGET_CAN_SPLIT_STACK +#endif +/* We steal the last transactional memory word. */ +#define TARGET_THREAD_SPLIT_STACK_OFFSET 0x30 #endif
