Cannot build qt5-webkit with debug

[Michael Osipov]

Am 2020-02-24 um 15:50 schrieb Miroslav Lachman:
> Miroslav Lachman wrote on 2020/02/24 12:48:
>> Short story:
>> I am trying to build qt5-webkit with WITH_DEBUG=yes in make.conf on 
>> our E3 Xeon machine with FreeBSD 11.3, poudriere-devel, 16GB of RAM 
>> and 10GB of swap.
>> The build always hangs, machine is unresponsive on SSH / HTTP, only 
>> ping is responding. I track it down to build eats all memory (RAM + 
>> Swap).
>>
>> Did anybody tried to build (successfully?) qt5-webkit with debug option?
>>
>> Is there a bug in build process with WITH_DEBUG or is 16GB of RAM and 
>> 10GB of swap not enough in these days?
>>
>> Any help appreciated.
>>
>> Long story:
>> As I didn't found replacement for removed port lang/phantomjs nor 
>> found how to build firefox or chromium as static binary I am trying to 
>> create new port of lang/phantomjs.
>> I posted few weeks ago - phantomjs github is active again
>> https://lists.freebsd.org/pipermail/freebsd-ports/2020-January/117556.html 
>>
>>
>> The new development version of phantomjs has different building 
>> process, newer dependencies, can be built with current OpenSSL 1.1.1 etc.
>> My (ugly) temporary version of this port is buildable, resulting 
>> binary "phantomjs" can run simple "Hello world" example
>> https://github.com/ariya/phantomjs/blob/master/examples/hello.js
>>
>> But when I try to run some real work (fetching web page) it segfaulted.
> 
> [...]
> 
>> I guess I need debug symbols for qt5-webkit to debug it further but I 
>> am not able to build it with WITH_DEBUG.
>>
>> Are there any ways / tuning options to build it without eating all 
>> memory and swap space?
> 
> Meanwhile I added 20GB more of a swap (total of 30GB) and the build 
> succeeded. (according to Zabbix graphs it used 22GB of swap for this build)
> 
> Phantomjs is still segfaulting and I am not able to debug it with gdb 
> because it is interrupted by segfault to:
> 
> (root at testjail) ~/# phantomjs /tmp/phantom.2.js
> PhantomJS has crashed. Please read the bug reporting guide at
> <http://phantomjs.org/bug-reporting.html> and file a bug report.
> Segmentation fault
> 
> 
> (root at testjail) ~/# gdb /usr/local/bin/phantomjs
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you 
> are
> welcome to change it and/or distribute copies of it under certain 
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "amd64-marcel-freebsd"...(no debugging 
> symbols found)...
> (gdb) run /tmp/phantom.2.js
> Starting program: /usr/local/bin/phantomjs /tmp/phantom.2.js
> Segmentation fault (core dumped)
> 
> 
> There are 2 core dumps
> 
> -rw-------  1 root  wheel   327M Feb 24 14:36 gdb.core
> -rw-------  1 root  wheel   4.9M Feb 24 14:36 phantomjs.core
> 
> What more can I try?
> I am not a C / C++ skilled person. All these things are new to me.

You can load the coredump into GDB and say "where" [1]. It will tell you 
the last frame it executed before it crashed. Make sure that your 
objects contains debug symbols. This mostly helped me to get a grasp of 
failures on FreeBSD and HP-UX.

[1] https://stackoverflow.com/a/5115653/696632