https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99203
Bug ID: 99203 Summary: Undefined behaviour in libquadmath file print_fp.c function __quadmath_printf_fp Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libquadmath Assignee: unassigned at gcc dot gnu.org Reporter: zeccav at gmail dot com Target Milestone: --- ! from fmt_en.f90 ! must be compiled and run ! gfortran compiler needs not be sanitized ! must load sanitized libquadmath.so.0 ! ldd a.out -> libquadmath.so.0 => /home/vitti/local/gcc-150221-undefined/lib64/libquadmath.so.0 !../../../gcc-150221/libquadmath/printf/printf_fp.c:762:4: runtime error: passing zero to ctz(), which is not a valid argument !../../../gcc-150221/libquadmath/printf/printf_fp.c:762: runtime error: passing zero to ctz(), which is not a valid argument ! printf_fp.c:762 -> "count_trailing_zeros (cnt_l, tmp[0]);" write(*, "(en15.2)") real(-.44444,kind=10) write(*, "(en15.2)") real(-.44444,kind=16) end