GDB and thread

Sun Dec 29 12:58:00 GMT 2019

On 2019年12月28日 15:28, Marco Atzeri wrote:
> Am 28.12.2019 um 23:03 schrieb Ken Brown:
>> On 12/28/2019 4:27 PM, Marco Atzeri wrote:
>>> I am trying to debug the libuv test failures,
>>> but it seems I am not able to convince GDB on stopping
>>> just before the failure.
>>>>>> Is "thread apply all" working on Cygwin ?
>>> The fact that produces no output in comparison to
>>> a normal break command is a bit strange
>>>>>> (gdb) break test-dlerror.c:34
>>> Breakpoint 1 at 0x10040b0b0: file /pub/devel/libuv/libuv-1.34.0/test/test-dlerro
>>> r.c, line 34.
>>> (gdb) thread apply all break test-dlerror.c:34
>>>> Others know this better than I do, but I seem to recall that a break command
>> automatically applies to all threads.Â  In other words, "thread apply all" is
>> redundant.
>> It seems to ignore any break for what I see.
> thread apply all was a tentative after simple break was ineffective

>>> Any hint will be appreciated
>>>> Might this be related to optimization?Â  That could change the order in which
>> lines of code are executed.Â  Have you tried building without optimization?
>> Already thought, but it is built with -ggdb -O0
Recommended to use at least -Og nowadays for better debugging:
	$ info gcc inv debug
"With no '-O' option at all, some compiler passes that collect information
useful for debugging do not run at all, so that '-Og' may result in a better
debugging experience."
-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
--
Problem reports: http://cygwin.com/problems.html
FAQ: http://cygwin.com/faq/
Documentation: http://cygwin.com/docs.html
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple