Clang crash compiling qt5

[George Mitchell]

On 2019-04-10 15:11, Dimitry Andric wrote:
> On 10 Apr 2019, at 19:37, George Mitchell <george+freebsd at m5p.com> wrote:
>>
>> Yesterday I went through a round of updating and compiling ports.  By
>> all outward appearances it was successful.  But this morning's daily
>> status report revealed that clang had crashed on a signal 11 once
>> while compiling each qt5 package.  (For once, it was useful to have
>> the "such-and-such installed" messages in the system log.)  So I just
>> tried recompiling qt5-qmake just now under "script".  Sure enough,
>> there was a clang crash about 15 seconds before the end of typescript,
>> though the typescript output looks completely innocuous as far as I
>> can see, and all the qt5 packages and their dependencies seem to be
>> functional at this point.  Any idea about what's going on?
>>
>> The typescript output is at https://m5p.com/~george/typescript if
>> you think it would be helpful.                            -- George
> 
> Hi George,
> 
> I don't see any crash report(s) in the typescript?  Did clang drop two
> files (a .sh and preprocessed .c or .cpp file) in /tmp, by any chance?
> 

Yes, it did -- quite a few of them.  The 13 .cpp files are all
identical.  The .sh files are very similar but not identical.  I
attached one.  Running it indeed causes another core dump.  It
sort of looks like it happened during a configuration step.
Explicitly running "make configure" yields this (plus another
core dump):

===>   qt5-qmake-5.12.2 depends on executable: gmake - found
===>   qt5-qmake-5.12.2 depends on package: pkgconf>=1.3.0_1 - found
===>   qt5-qmake-5.12.2 depends on file: /usr/local/bin/python3.6 - found
===>  Configuring for qt5-qmake-5.12.2
/bin/mkdir -p /usr/ports/devel/qt5-qmake/work/qtbase-everywhere-src-5.12.2
echo 'CMAKE_MODULE_TESTS = -' >
/usr/ports/devel/qt5-qmake/work/qtbase-everywhere-src-5.12.2/.qmake.cache
echo 'QMAKE_LIBDIR_FLAGS =
-L/usr/ports/devel/qt5-qmake/work/qtbase-everywhere-src-5.12.2/lib' >>
/usr/ports/devel/qt5-qmake/work/qtbase-everywhere-src-5.12.2/.qmake.cache
echo 'QMAKE_DEFAULT_LIBDIRS = /usr/local/lib' >>
/usr/ports/devel/qt5-qmake/work/qtbase-everywhere-src-5.12.2/.qmake.cache
echo 'QMAKE_DEFAULT_INCDIRS = /usr/local/include' >>
/usr/ports/devel/qt5-qmake/work/qtbase-everywhere-src-5.12.2/.qmake.cache
Creating qmake...

> If you are using a stable branch, clang will not have been built with
> assertions, and that can lead to crashes in some cases.  You could try
> commenting out the -DNDEBUG line in lib/clang/llvm.build.mk, and then
> rebuilding and reinstalling world.  Then try the port again.
> 
> -Dimitry
> 

Gosh, I cravenly confess to a lack of enthusiasm for doing this.
My self-serving excuse is that no packages outside qt5 exhibited
this problem, and even qt5 superficially appears to be okay ...
-- George
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