https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111852
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:bc4bd69faf986326f6b0fd0400cdd6871577afd1 commit r14-4722-gbc4bd69faf986326f6b0fd0400cdd6871577afd1 Author: Jakub Jelinek <ja...@redhat.com> Date: Wed Oct 18 17:01:26 2023 +0200 cse: Workaround GCC < 5 bug in cse_insn [PR111852] Before the r5-3834 commit for PR63362, GCC 4.8-4.9 refuses to compile cse.cc which contains a variable with rtx_def type, because rtx_def contains a union with poly_uint16 element. poly_int template has defaulted default constructor and a variadic template constructor which could have empty parameter pack. GCC < 5 treated it as non-trivially constructible class and deleted rtunion and rtx_def default constructors. For the cse_insn purposes, all we need is a variable with size and alignment of rtx_def, not necessarily rtx_def itself, which we then memset to 0 and fill in like rtx is normally allocated from heap, so this patch for GCC_VERSION < 5000 uses an unsigned char array of the right size/alignment. 2023-10-18 Jakub Jelinek <ja...@redhat.com> PR bootstrap/111852 * cse.cc (cse_insn): Add workaround for GCC 4.8-4.9, instead of using rtx_def type for memory_extend_buf, use unsigned char arrayy with size of rtx_def and its alignment.
