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

Alan,
> 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.
Did you use configure/Make or CMake to build llvm-3.2?
> 
> 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).
You can use "ldd" command to see what shared libraries are linked into
your application, please post what you find out.
> 
> 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
> ---------------------------------------
> 
Paweł

Hi Paweł,

On 16 Jan 2013, at 18:23, Pawel Wodnicki <root at 32bitmicro.com> wrote:
> Alan,
> 
>> 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.
> 
> Did you use configure/Make or CMake to build llvm-3.2?
I used CMake, but my own CMakeLists.txt file since I don't simply want a
shared library, but a plugin (in the Qt sense). Also, I want things to work on
Windows while LLVM (still) doesn't handle DLL imports/exports (so, yes, I
use __declspec(dllexport) / __declspec(dllimport) on all the classes that I need
for my project, and yes, it's a pain every time a new version of LLVM comes
out… :)).
>> 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).
> 
> You can use "ldd" command to see what shared libraries are linked
into
> your application, please post what you find out.
I have checked all my libraries with ldd and only my LLVM plugin needs
LLVM-related things, hence I am really puzzled indeed.

Alan