https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79430
--- Comment #19 from Bijan Chokoufe <bijan at chokoufe dot com> --- So in the build with '-O2 -g' (default), valgrind tells us ==8214== Conditional jump or move depends on uninitialised value(s) ==8214== at 0x5300201: __shower_core_MOD_shower_generate_next_isr_branching (shower_core.f90:3089) ==8214== by 0x5306A90: __shower_core_MOD_shower_generate_emissions (shower_core.f90:316) ==8214== by 0x52D3CE6: __shower_MOD_evt_shower_generate_weighted.part.2 (shower.f90:238) ==8214== by 0x52B0BBF: __event_transforms_MOD_evt_generate_unweighted (event_transforms.f90:203) ==8214== by 0x52DCEA5: __events_MOD_event_evaluate_transforms (events.f90:520) ==8214== by 0x52DC247: __events_MOD_event_generate (events.f90:751) ==8214== by 0x5260A2F: __simulations_MOD_simulation_generate (simulations.f90:1639) ==8214== by 0x5285A35: __commands_MOD_cmd_simulate_execute (commands.f90:4501) ==8214== by 0x5267A08: __commands_MOD_command_list_execute (commands.f90:5835) ==8214== by 0x52A84A5: __whizard_MOD_whizard_process_stream (whizard.f90:348) ==8214== by 0x52A7C25: __whizard_MOD_whizard_process_file (whizard.f90:323) ==8214== by 0x4E3EF61: MAIN__ (main.f90:415) ==8214== which is exactely the problematic point we also identified with print debugging, mentioned in the description of this ticket. In the build with '-O0 -g', valgrind does not show this error! So it seems as if the call to integral_over_z_part_isr is optimized away although it is needed to set the variables used in the conditional. The variables are declared as intent(inout) therein.
