https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114222
--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jeff Law <l...@gcc.gnu.org>: https://gcc.gnu.org/g:898f22d15805229a932fff7f22a0a8054e1b9b31 commit r15-7773-g898f22d15805229a932fff7f22a0a8054e1b9b31 Author: Jan Dubiec <j...@o2.pl> Date: Sat Mar 1 08:21:16 2025 -0700 [PATCH] H8/300, libgcc: PR target/114222 For HImode call internal ffs() implementation instead of an external one When INT_TYPE_SIZE < BITS_PER_WORD gcc emits a call to an external ffs() implementation instead of a call to "__builtin_ffs()" รข see function init_optabs() in <SRCROOT>/gcc/optabs-libfuncs.cc. External ffs() (which is usually the one from newlib) in turn calls __builtin_ffs() what causes infinite recursion and stack overflow. This patch overrides default gcc bahaviour for H8/300H (and newer) and provides a generic ffs() implementation for HImode. PR target/114222 gcc/ChangeLog: * config/h8300/h8300.cc (h8300_init_libfuncs): For HImode override calls to external ffs() (from newlib) with calls to __ffshi2() from libgcc. The implementation of ffs() in newlib calls __builtin_ffs() what causes infinite recursion and finally a stack overflow. libgcc/ChangeLog: * config/h8300/t-h8300: Add __ffshi2(). * config/h8300/ffshi2.c: New file.
