https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106264
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Roger Sayle <sa...@gcc.gnu.org>: https://gcc.gnu.org/g:40f6e5912288256ee8ac41474f2dce7b6881c111 commit r13-1741-g40f6e5912288256ee8ac41474f2dce7b6881c111 Author: Roger Sayle <ro...@nextmovesoftware.com> Date: Tue Jul 19 08:39:43 2022 +0100 PR c/106264: Silence warnings from __builtin_modf et al. This middle-end patch resolves PR c/106264 which is a spurious warning regression caused by the tree-level expansion of modf, frexp and remquo producing "expression has no-effect" when the built-in function's result is ignored. When these built-ins were first expanded at tree-level, fold_builtin_n would blindly set TREE_NO_WARNING for all built-ins. Now that we're more discerning, we should precisely call suppress_warning selectively on those COMPOUND_EXPRs that need them. 2022-07-19 Roger Sayle <ro...@nextmovesoftware.com> Richard Biener <rguent...@suse.de> gcc/ChangeLog PR c/106264 * builtins.cc (fold_builtin_frexp): Call suppress_warning on COMPOUND_EXPR to silence spurious warning if result isn't used. (fold_builtin_modf): Likewise. (do_mpfr_remquo): Likewise. gcc/testsuite/ChangeLog PR c/106264 * gcc.dg/pr106264.c: New test case.
