It worked like a charm for this. Thank you David! One other issue that’s been a source of concern with clang/llvm and the objc lib:
It seems it cannot correctly load the meta-data for classes. This has happened
with clang-3.8 and clang-4.0
But on this most recent build I tried to downgrade everything back to clang-3.6
and it still acting up. Here
is the backtrace:
~~~bash
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff72d845e in isEmptyProtocol () from /usr/local/lib/libobjc.so.4.6
(gdb) where
#0 0x00007ffff72d845e in isEmptyProtocol () from /usr/local/lib/libobjc.so.4.6
#1 0x00007ffff72d82cd in unique_protocol () from /usr/local/lib/libobjc.so.4.6
#2 0x00007ffff72d65c6 in init_protocols () from /usr/local/lib/libobjc.so.4.6
#3 0x00007ffff72d65ba in init_protocols () from /usr/local/lib/libobjc.so.4.6
#4 0x00007ffff72d63b5 in objc_init_protocols () from
/usr/local/lib/libobjc.so.4.6
#5 0x00007ffff72cd7b4 in load_category () from /usr/local/lib/libobjc.so.4.6
#6 0x00007ffff72cd4f8 in try_load_category () from
/usr/local/lib/libobjc.so.4.6
#7 0x00007ffff72cd485 in objc_try_load_category () from
/usr/local/lib/libobjc.so.4.6
#8 0x00007ffff72d5f5d in __objc_exec_class () from
/usr/local/lib/libobjc.so.4.6
#9 0x00007ffff7de76ba in call_init (l=<optimized out>, argc=argc@entry=3,
argv=argv@entry=0x7fffffffe608, env=env@entry=0x7fffffffe628)
at dl-init.c:72
#10 0x00007ffff7de77cb in call_init (env=0x7fffffffe628, argv=0x7fffffffe608,
argc=3, l=<optimized out>) at dl-init.c:30
#11 _dl_init (main_map=0x7ffff7ffe168, argc=3, argv=0x7fffffffe608,
env=0x7fffffffe628) at dl-init.c:120
#12 0x00007ffff7dd7c6a in _dl_start_user () from /lib64/ld-linux-x86-64.so.2
#13 0x0000000000000003 in ?? ()
#14 0x00007fffffffe820 in ?? ()
#15 0x00007fffffffe843 in ?? ()
#16 0x00007fffffffe846 in ?? ()
#17 0x0000000000000000 in ?? ()
~~~
As you can see, this occurs even *before* my code gets a chance to run.
Any suggestion to debug this further?
—
Laurent
On 6 Oct 2017, at 12:15, David Chisnall wrote:
> Hi,
>
> I need to do a new release soon, as this was fixed in trunk ages ago…
>
> If you run cmake with the -DLLVM_OPTS=off flag, then you should avoid this
> error.
>
> David
>
>> On 6 Oct 2017, at 16:36, Laurent Michel <l...@thorgal.homelinux.org> wrote:
>>
>> Dear All,
>>
>> I just attempted to build the whole GNUstep suite with libobjc2 in a docker
>> container
>> based on Ubuntu 16.04 and clang/llvm 3.8 n(also tried with 4.0 with the same
>> result)
>>
>> I encounter the following issue when trying to build libobjc2. Namely, cmake
>> really
>> does not like the AddLLVM directive it finds. This is with the git version
>> of libobjc2 and
>> checking out the 1.8.1 tag. I googled and saw that this “kind” of issues
>> has been ongoing for a while, but I couldn’t locate a clear-cut solution.
>>
>> Note that this is not the first time I build GNUstep and didn’t have this
>> problem in the past.
>> Does that mean that the Ubuntu version of clang is broken and the compiler
>> itself (+llvm) must
>> be build from source to get anywhere?
>>
>> Many thanks for relevant pointers!
>>
>> Best,
>> —
>> Laurent
>>
>> PS/ Here is the complaint from cmake
>>
>> export CC=clang-3.8;export CXX=
>> clang++-3.8;cmake ..
>> -- The C compiler identification is Clang 3.8.0
>> -- The CXX compiler identification is Clang 3.8.0
>> -- Check
>> for
>> working C compiler: /usr/bin/clang-3.8
>> -- Check
>> for
>> working C compiler: /usr/bin/clang-3.8 -- works
>> -- Detecting C compiler ABI info
>> -- Detecting C compiler ABI info -
>> done
>>
>> -- Detecting C compile features
>> -- Detecting C compile features -
>> done
>>
>> -- Check
>> for
>> working CXX compiler: /usr/bin/clang++-3.8
>> -- Check
>> for
>> working CXX compiler: /usr/bin/clang++-3.8 -- works
>> -- Detecting CXX compiler ABI info
>> -- Detecting CXX compiler ABI info -
>> done
>>
>> -- Detecting CXX compile features
>> -- Detecting CXX compile features -
>> done
>>
>> -- The ASM compiler identification is Clang
>> -- Found assembler: /usr/bin/clang-3.8
>> CMake Error at opts/CMakeLists.txt:4
>> (include)
>> :
>> include could not find load file:
>>
>> AddLLVM
>>
>>
>> CMake Error at opts/CMakeLists.txt:11
>> (add_llvm_loadable_module)
>> :
>> Unknown CMake
>> command "add_llvm_loadable_module"
>> .
>>
>>
>> _______________________________________________
>> Gnustep-dev mailing list
>> Gnustep-dev@gnu.org
>> https://lists.gnu.org/mailman/listinfo/gnustep-dev
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