07858: CORE: Use of -verbose causes a crash before start

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07858	Crash/Freeze	Minor	Always	Jan 27, 2021, 14:05	Jun 10, 2021, 00:37

Tester	Robbbert	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10 (64-bit)
Status [?]	Confirmed			Driver
Version	0.228	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07858: CORE: Use of -verbose causes a crash before start
Description	Use of the verbose switch will cause many games to crash while in the process of starting up.
Steps To Reproduce	With the official build, do >mame64 batman -v It will crash while starting the video device
Additional Information	Tafoid has a list of several hundred other games that have the same issue. I picked batman as it seemed to always happen with the official MAME. This issue does not occur with my homebuilt MAME, possibly because of a different GCC version. (I'm using 10.1)
Github Commit

Flags
Regression Version
Affected Sets / Systems	CORE

Attached Files

No.18407 Tafoid Administrator Jan 27, 2021, 14:11	Some more examples: https://mameload.mameworld.info/verbosecrash.txt https://mameload.mameworld.info/verbosecrash2.txt Similar to what was reported in late 2019 which was suspected to be some compiler bug that was exposed during code changes. https://www.mameworld.info/ubbthreads/showthreaded.php?Cat=&Number=384425
No.18413 cuavas Administrator Jan 28, 2021, 04:31	I ran gauntlet in a release build under valgrind, and it didn’t turn up any branches on uninitialised values or out-of-bounds accesses (I realise that was on Linux, so different calling convention, object format, etc. but it would still turn up a lot of issues). Given it’s jumping into the weeds from the well-exercised string formatting code, it looks a lot like a compiler bug.
No.18804 cuavas Administrator May 4, 2021, 18:42	Interestingly, `-fomit-frame-pointer` acts as a work-around. It really looks like something going wrong with exception unwinding.
No.18851 Robbbert Developer May 16, 2021, 05:46	From Tafoid: Issue traced to January 20, 2021 "Much more core std::string_view modernization" https://github.com/mamedev/mame/commit/91921618c2e06bd0ed073b8efccd31a127c9012d
No.18958 Robbbert Developer Jun 9, 2021, 23:34	The issue is no longer in evidence in the release of 0.232 . Cuavas can this be closed?
No.18959 Tafoid Administrator Jun 10, 2021, 00:37	AFAIK it is still happening, just not in integer release builds due to him adding that compile flag mentioned above. It still crashes for me upon testing current day's Git source.