Re: Pike on OpenBSD

On Tue, 3 Jan 2017, Bernd Schoeller wrote:

> On 03/01/17 09:14, Henrik Grubbström wrote:
>>  Ah, the configure output explains it;
>> 
>> >  checking SO... so
>> >  checking LDSHARED... gcc -Wl,-Bshareable
>> >  checking CCSHARED... checking -fPIC... yes
>> >  -fPIC
>> >  checking LINKFORSHARED... -Wl,-E
>> >  checking -static-libgcc... yes
>> >  checking if dynamic loading works... no
>>                                         ^^
>>
>>  So for some reason dlopen() et al don't work as intended, and thus
>>  you get a pike with only static modules, which means that the main
>>  pike binary won't get compiled until after post_modules.
>>
>>  /home/schoelle/Code/Pike-v8.0.388/build/openbsd-6.0-amd64/config.log
>>  should give a hint about why dlopen() failed.
>
> Ok - that explains it:
>
> configure: 68713: checking for dlopen in -ldl
> configure: 68738: 
> /home/schoelle/Code/Pike-v8.0.388/build/openbsd-6.0-amd64/smartlink gcc -o 
> conftest -g  -fvisibility=hidden -O3 -pipe -ggdb -funswitch-loops 
> -I/usr/local/include -I/usr/X11R6/include 
> -I/home/schoelle/Code/Pike-v8.0.388/src 
> -I/home/schoelle/Code/Pike-v8.0.388/build/openbsd-6.0-amd64 -L/usr/local/lib 
> -R/usr/local/lib -L/usr/X11R6/lib -R/usr/X11R6/lib 
> -L/usr/lib/gcc-lib/amd64-unknown-openbsd6.0/4.2.1 conftest.c -ldl  -lm  >&5
> /usr/bin/ld: cannot find -ldl
> collect2: ld returned 1 exit status

The above is expected and is just a test to see if -ldl is required.

You need to look further down in the config.log.

> Looks like -ldl is not needed on OpenBSD. The functions are available as 
> documented here:
>
> http://man.openbsd.org/OpenBSD-current/man3/dlfcn.3
>
> I have removed the inclusion of -ldl into LIBS in the configure script.
>
> Now, things are very messy with lots of errors. Will continue to dig further.
>
> Current output is here:
>
> https: //www.fams.de/bernte/gmake-out2.txt
> https: //www.fams.de/bernte/config.log.txt

From config.log.txt:

> configure:79378: checking if dynamic loading works
> /home/schoelle/Code/Pike-v8.0.388/build/openbsd-6.0-amd64/smartlink gcc -c -g -fvisibility=hidden -O3 -pipe -ggdb -funswitch-loops -pthread -fPIC conftest.c -o conftest.o
> /home/schoelle/Code/Pike-v8.0.388/bin/smartlink gcc -Wl,-Bshareable -L/usr/local/lib -R/usr/local/lib -L/usr/X11R6/lib -R/usr/X11R6/lib -L/usr/lib/gcc-lib/amd64-unknown-openbsd6.0/4.2.1 -pthread conftest.o -o conftest.so
> configure:79430: /home/schoelle/Code/Pike-v8.0.388/build/openbsd-6.0-amd64/smartlink gcc -o conftest -g  -fvisibility=hidden -O3 -pipe -ggdb -funswitch-loops -pthread -Wl,-E  -I/usr/local/include -I/usr/X11R6/include -I/home/schoelle/Code/Pike-v8.0.388/src -I/home/schoelle/Code/Pike-v8.0.388/build/openbsd-6.0-amd64  -L/usr/local/lib -R/usr/local/lib -L/usr/X11R6/lib -R/usr/X11R6/lib -L/usr/lib/gcc-lib/amd64-unknown-openbsd6.0/4.2.1 -pthread conftest.c -lm  >&5
> In file included from conftest.c:258:
> /home/schoelle/Code/Pike-v8.0.388/src/dynamic_load.c: In function 'main':
> /home/schoelle/Code/Pike-v8.0.388/src/dynamic_load.c:719: warning: incompatible implicit declaration of built-in function 'exit'
> /home/schoelle/Code/Pike-v8.0.388/src/dynamic_load.c:725: warning: incompatible implicit declaration of built-in function 'exit'
> /home/schoelle/Code/Pike-v8.0.388/src/dynamic_load.c:732: warning: incompatible implicit declaration of built-in function 'exit'
> /home/schoelle/Code/Pike-v8.0.388/src/dynamic_load.c:737: warning: incompatible implicit declaration of built-in function 'exit'
> conftest.c: In function 'testfunc2':
> conftest.c:262: warning: incompatible implicit declaration of built-in function 'exit'
> configure:79430: $? = 0
> configure:79430: ./conftest
> conftest:./myconftest.so: undefined symbol 'main'
> Failed to link myconftest.so: Cannot load specified object
> configure:79430: $? = 1
> configure: program exited with status 1

The actual problem is the "./myconftest.so: undefined symbol 'main'",
which indicates that CCSHARED and/or LINKFORSHARED don't have the
correct contents. I suspect that the problem is with CCSHARED, as 
AFAIK myconftest.so shouldn't reference main at all.

This looks suspiciously like something I've already fixed in Pike 8.1:

|   if test "$GCC:$ldshared_is_cc" = "yes:yes" ; then
|     # On some architectures gcc attempts to link the shared object with
|     # the standard startup files (crt0.o et al), which may fail due to
|     # relocation errors. The flag -nostartfiles exists in gcc since at
|     # least version 3.3.2 from 2003, so this should be safe.
|     LDSHARED="$LDSHARED -nostartfiles"
|   fi

BTW: I believe that it's probably better to first attempt to get Pike 8.1
      running, and then backport the fixes to Pike 8.0, than the opposite.

      You can always get a fresh Pike 8.1 dist from Pikefarm:
      http://pike.lysator.liu.se/generated/pikefarm/packages/devel/latest

 	/grubba

-- 
Henrik Grubbström					[email protected]
Roxen Internet Software AB