llvm dev - Jan 2013 - [LLVMdev] LLVM 3.2: conflict with Ubuntu 12.04's version 3.0 of LLVM

Hi,

I am working on a Qt project which relies on various plugins, one of which being
an LLVM plugin which I build from the LLVM 3.2 source code. Everything works
fine on Windows and OS X, but not on Ubuntu 12.04.

Basically, my application runs fine, but when I close it I get a
"Segmentation fault (core dumped)". Debugging my application, I found
out that, upon shutting down, my application tries to call Ubuntu's version
of LLVM (see below for the debug trace). To convince myself that it was really
the case, I sudo renamed Ubuntu's LLVM library and rerun my application. As
expected, everything worked fine (i.e. no segmentation fault).

Now, it's clearly not an issue with LLVM itself, but a google search
didn't yield anything useful, so I was hoping that someone else might have
come across this issue before and, more importantly, would have found a solution
for it...

Cheers, Alan.

---------------------------------------
0	__GI_raise	raise.c	64	0x7ffff5d92425
1	__GI_abort	abort.c	91	0x7ffff5d95b8b
2	__libc_message	libc_fatal.c	201	0x7ffff5dd039e
3	malloc_printerr	malloc.c	5007	0x7ffff5ddab96
4	llvm::PassNameParser::~PassNameParser()
/usr/lib/x86_64-linux-gnu/libLLVM-3.0.so.1		0x7fffc01b16c2
5	llvm::cl::list<llvm::PassInfo const*, bool,
llvm::PassNameParser>::~list()	/home/me/myApp/build/plugins/myApp/libLLVM.so	
0x7fffc7b25568
6	__run_exit_handlers	exit.c	78	0x7ffff5d97901
7	__GI_exit	exit.c	100	0x7ffff5d97985
8	__libc_start_main	libc-start.c	258	0x7ffff5d7d774
9	_start			0x426b29
---------------------------------------

Alan Garny <agarny at hellix.com> writes:
> Basically, my application runs fine, but when I close it I get a
> "Segmentation fault (core dumped)". Debugging my application, I
found
> out that, upon shutting down, my application tries to call Ubuntu's
> version of LLVM (see below for the debug trace). To convince myself
> that it was really the case, I sudo renamed Ubuntu's LLVM library and
> rerun my application. As expected, everything worked fine (i.e. no
> segmentation fault).
>
> Now, it's clearly not an issue with LLVM itself, but a google search
> didn't yield anything useful, so I was hoping that someone else might
> have come across this issue before and, more importantly, would have
> found a solution for it...
Well, two simple things you can try: either uninstall Ubuntu's LLVM 3.0,
or set LD_LIBRARY_PATH (and PATH, if the plugin also uses the LLVM
command tools.)

On 16 Jan 2013, at 18:15, Óscar Fuentes <ofv at wanadoo.es> wrote:
> Alan Garny <agarny at hellix.com> writes:
> 
>> Basically, my application runs fine, but when I close it I get a
>> "Segmentation fault (core dumped)". Debugging my application,
I found
>> out that, upon shutting down, my application tries to call Ubuntu's
>> version of LLVM (see below for the debug trace). To convince myself
>> that it was really the case, I sudo renamed Ubuntu's LLVM library
and
>> rerun my application. As expected, everything worked fine (i.e. no
>> segmentation fault).
>> 
>> Now, it's clearly not an issue with LLVM itself, but a google
search
>> didn't yield anything useful, so I was hoping that someone else
might
>> have come across this issue before and, more importantly, would have
>> found a solution for it...
> 
> Well, two simple things you can try: either uninstall Ubuntu's LLVM
3.0,
> or set LD_LIBRARY_PATH (and PATH, if the plugin also uses the LLVM
> command tools.)
Thanks Óscar. Your first suggestion is not an option for me (I can't and
wouldn't want to tell my users what to do with their Ubuntu box), but
LD_LIBRARY_PATH (or, better for me, RPATH) might do the trick. I will give it a
try tomorrow...

Alan