Re: exceptions pulling an Abort Trap

[Riccardo Mottola]

Hi David,

On 2018-05-24 12:44:21 +0000 David Chisnall 
<address@hidden> wrote:

> Hi Riccardo,
>
> This looks like what happens if you have no @catch block anywhere on 
> the 
> stack.  If you can recompile the runtime, try sticking #define 
> DEBUG_EXCEPTIONS in eh_personality.c - it will report where failures 
> are 
> happening.

thanks for the hint. First, let me specify that the libobjc2 I had 
installed was the binary package provided by FreeBSD. The platform is 
x86

Second, I noticed that I need libobjc2 package, if i remove it, 
gnustep base does not find any runtime with GCC7. Could it be that the 
gcc provided by FreeBSD packages contains language support but no 
runtime with the intent to have a single runtime for everything (which 
would be yours)?
Indeed I did not find any other libobjc.so in /usr/local

I tried building libobjc2 from our github repo sources (I did not yet 
modivy eh_personality.c, tried a stock compilation), but i fails this 
way:

Scanning dependencies of target CXXExceptions
[ 12%] Building C object 
Test/CMakeFiles/CXXExceptions.dir/CXXException.m.o
cc: error: unable to execute command: Segmentation fault (core dumped)
cc: error: clang frontend command failed due to signal (use -v to see 
invocation)
FreeBSD clang version 4.0.0 (tags/RELEASE_400/final 297347) (based on 
LLVM 4.0.0)
Target: i386-unknown-freebsd11.1
Thread model: posix
InstalledDir: /usr/bin
cc: note: diagnostic msg: PLEASE submit a bug report to 
https://bugs.freebsd.org/submit/ and include the crash backtrace, 
preprocessed source, and associated run script.
cc: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
cc: note: diagnostic msg: /tmp/ForwardDeclareProtocol-f61ec1.m
cc: note: diagnostic msg: /tmp/ForwardDeclareProtocol-f61ec1.sh
cc: note: diagnostic msg:


If I run make again, it will continue, but fail repeatably in other 
places:
[ 11%] Built target ObjCXXEHInterop
[ 11%] Building C object 
Test/CMakeFiles/ForwardDeclareProtocolAccess.dir/ForwardDeclareProtocol.m.o
cc: error: unable to execute command: Segmentation fault (core dumped)
cc: error: clang frontend command failed due to signal (use -v to see 
invocation)
FreeBSD clang version 4.0.0 (tags/RELEASE_400/final 297347) (based on 
LLVM 4.0.0)

this place looks repeatable, if I run make again and again.

A bit unexpected? Can I force it to build with gcc7 or another versin 
of clang? Apparently packages are only for lder versions than 4.0:

bazel-clang38-0.11.0           Fast and correct build system
clang-devel-7.0.d20180327      C, Objective-C, and C++ compiler (use 
devel/llvm-devel)
clang33-3.3_10                 C, Objective-C, and C++ compiler
clang34-3.4.2_8                C, Objective-C, and C++ compiler
clang35-3.5.2_4                C, Objective-C, and C++ compiler
clang38-3.8_1                  C, Objective-C, and C++ compiler (use 
devel/llvm38)

Thanks,

Riccardo