compiling GNUstep on OpenBSD - various compiler/runtime options

[Riccardo Mottola]

Hi All!


I am testing Niels' fork of make... and OpenBSD is one of the 
candidates, since I have since long issues with gcc there. I hope we can 
fix it because I like what Niels is doing there.

Just to make some clarity, let me sum up what is my knowledge:

We have two compilers: gcc and clang.

We have two runtime libraries: gcc one and libobjc2 in our repo by 
David. David's runtime can be used in "gnu" and "ng" mode. Correct? 
However there is no need to configure it, it is the same library built 
and installed the same which then supports both (save bugs).

GCC of course supports only "gnu", its own runtime and and libobjc2 but 
only in "gnu" mode.

Clang can be again used in both ng and gnu, but of course only with 
libobjc2 since it has no own runtime.

This gives us the following combinations possible:

1) gcc + own runtime (make detects this config all by itself)

2) gcc + libobjc2 (make configured with gnu-gnu-gnu)

3) clang + libobjc2 and make configured gnu-gnu-gnu

4) clang + libobjc2 and make configured ng-gnu-gnu


Now, On OpenBSD I have a small mess:


Option 1) is proven and works for me except on OpenBSD. Here it fails:

Making all for subproject ObjectiveC2...
 Compiling file runtime.c ...
runtime.c:35:10: fatal error: objc/objc-api.h: No such file or directory
 #include <objc/objc-api.h>
          ^~~~~~~~~~~~~~~~~
compilation terminated.

I was never able to get this working, there are different revisions of 
objc in gcc. At one point I just decided to use libobjc2 (but this 
stopped working).


Option 2), doesn't works for me either. I configure make (Niels version) 
like this:

./configure --prefix=/ --with-layout=gnustep CC=egcc CXX=eg++ 
--with-library-combo=gnu-gnu-gnu

this doesn't work for me. base doesn't detect the library:

configure:6008: checking the Objective-C runtime
configure:6018: result: GNU
configure:6037: checking for custom shared objc library
configure:6096: result: NONE

and then fails to get working objc:


configure:7856: checking whether objc really works
configure:7876: egcc -o conftest -g -O2  -I/Local/Library/Headers 
-I/Local/Library/Headers -I/System/Library/Heade
rs -I/usr/local/include  -x objective-c -L/Local/Library/Libraries 
-L/Local/Library/Libraries -L/System/Library/L
ibraries -L/usr/local/lib conftest.c  -lpthread -Wl,-E -pthread 
-L/home/multix/GNUstep/Library/Libraries -L/Local/
Library/Libraries -L/System/Library/Libraries -L/usr/local/lib -lobjc 
-lm     >&5
In file included from /System/Library/Headers/objc/runtime.h:219,
                 from /System/Library/Headers/objc/objc.h:1,
                 from ./config/objc-common.g:4,
                 from ./config/config.objc.m:2,
                 from conftest.c:104:
/System/Library/Headers/objc/slot.h:31:1: sorry, unimplemented: 
'_Atomic' in Objective-C
 OBJC_PUBLIC extern _Atomic(uint64_t) objc_method_cache_version;
 ^~~~~~~~~~~
configure:7876: $? = 1


Option 3)

Configure make with:

./configure --prefix=/ --with-layout=gnustep 
--with-library-combo=gnu-gnu-gnu


checking the Objective-C runtime... GNU
checking for custom shared objc library... NONE
checking objc/runtime.h usability... no
checking objc/runtime.h presence... yes
configure: WARNING: objc/runtime.h: present but cannot be compiled
configure: WARNING: objc/runtime.h:     check for missing prerequisite 
headers?
configure: WARNING: objc/runtime.h: see the Autoconf documentation
configure: WARNING: objc/runtime.h:     section "Present But Cannot Be 
Compiled"
configure: WARNING: objc/runtime.h: proceeding with the compiler's result
checking for objc/runtime.h... no
checking objc/objc.h usability... no
checking objc/objc.h presence... yes
configure: WARNING: objc/objc.h: present but cannot be compiled
configure: WARNING: objc/objc.h:     check for missing prerequisite headers?
configure: WARNING: objc/objc.h: see the Autoconf documentation
configure: WARNING: objc/objc.h:     section "Present But Cannot Be 
Compiled"
configure: WARNING: objc/objc.h: proceeding with the compiler's result
checking for objc/objc.h... no
Check to make sure you have the Objective-C runtime library
and its headers installed.
configure: error: Could not find Objective-C headers


Option 4)

Make configured with:

./configure --prefix=/ --with-layout=gnustep 
--with-library-combo=ng-gnu-gnu


here configure works, but then compile fails:

 Linking tool cvtenc ...
ld: error: undefined symbol: _Unwind_Resume
>>> referenced by cvtenc.m:0
>>> ./obj/cvtenc.obj/cvtenc.m.o:(gnustep_base_user_main)
 Compiling file AGSParser.m ...
clang: error: linker command failed with exit code 1 (use -v to see 
invocation)

and here starts a dilemma. I tried as a workaround:

 ./configure LDFLAGS=-lstdc++

(used then also for gui, back...) and added to compile Ink.

But then, a test test run ends like this:

Program received signal SIGFPE, Arithmetic exception.
0x000002b46e5fd66f in ?? () from /usr/libexec/ld.so
(gdb) bt
#0  0x000002b46e5fd66f in ?? () from /usr/libexec/ld.so
#1  0x000002b44f363c00 in ?? ()
#2  0x0000000000000000 in ?? ()


Riccardo