https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80394
Alexander Monakov <amonakov at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |amonakov at gcc dot gnu.org --- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> --- omp-low.c: scan_omp_task () has: 1860 /* Ignore task directives with empty bodies. */ 1861 if (optimize > 0 1862 && empty_body_p (gimple_omp_body (stmt))) 1863 { 1864 gsi_replace (gsi, gimple_build_nop (), false); 1865 return; 1866 } This was added to trunk with r136433 (OpenMP 3.0 merge), before the 'depend' clause appeared in OpenMP 4.0.