Re: [swarm-hackers] A radical suggestion

[Bill Northcott]

> >This does not reproduce the problem.
> >
> What problem?  I've seen no error log.

Sorry, I thought I had posted the error log.  You should be able to 
reproduce it yourself by pulling the current code from the cvs and 
following the instructions in README.MacOSX and INSTALL.MacOSX.  The Swarm 
target in the PB project will attempt a full autogen.sh, configure, make 
sequence.

Since this is a fair amount of hassle what with building an FSF compiler 
because the Apple one crashes etc, I reproduce the error at the end of the 
email.  Renaming the Swarm runtime as libobjcs and amended reissuing the 
instruction with -lobjcs reduces the undefined symbol count to two from 
scores.

> >Swarm is working on ObjectiveC code and the compiler is clearly in
> >ObjectiveC mode because it has ObjectiveC flags and does not complain. 
In
> >Objective-C mode, the compiler is automatically generating calls to the
> >Objective-C runtime.  In C mode it presumably generates automatic calls
> >only to the C runtime, which is not called libobjc.  So your link would
> >not have the problem, which is in Swarm.
> >
> >
> Ok, see attachment for the same thing done with the Objective C 
compiler.

Actually it fails in just the same way Swarm is failing!:

$make
/usr/bin/libtool -dynamic objc.o objc_sym.o -o libobjc.dylib -lc
ld: for architecture ppc
ld: Undefined symbols:
___objc_class_name_Object
___objc_exec_class
/usr/bin/libtool: internal link edit command failed
make: *** [libobjc.dylib] Error 1

The difference is I changed the Makefile:
all: example
%.o: %.m
        gcc -fno-common -fgnu-runtime -c $< -o $@
%.o: %.c
        gcc -no-cpp-precomp -fno-common -c $< -o $@
libobjc.dylib: objc.o objc_sym.o
        /usr/bin/libtool -dynamic objc.o objc_sym.o -o libobjc.dylib -lc
example: example.m libobjc.dylib
        gcc example.m -L. -lobjc -o $@
clean:
        $(RM) objc.o objc_sym.o example libobjc.dylib

I have been trying to work out the easiest way to frame an example.  Wo I 
just did it!
It worked for you because you did not use the -fgnu-runtime flag.  In your 
build, gcc would have generated calls to the Apple runtime which would 
have been satisfied by ld linking against the Apple libobjc.  So your were 
linking both your libobjc and the Apple one.  We need it to ignore the 
Apple one completely.

The Swarm code in the cvs builds what should be a viable libobjc. So we 
could use that to test simple examples.  I'll try today.

Bill

Compile log from Swarm build failing in tools directory:
mv -f findImp.o .libs/findImp.lo
/Users/billn/Public/GNU/dst/bin/gcc -no-cpp-precomp -DHAVE_CONFIG_H -I. 
-I../../../../tools -I.. -I.. -I../src -I../../../../src -I../libobjc 
-I../../../../libobjc -I../../../../src/collections 
-I../../../../src/defobj -I../../../../src/activity 
-I../../../../src/objectbase -I../../../../src/random 
-I../../../../src/simtools -I../../../../src/gui 
-I../../../../src/simtoolsgui -I../../../../src/misc -I. -DDLL_EXPORT -g 
-O2 -fgnu-runtime -fno-strict-aliasing -Wall -Wno-import -Wno-protocol 
-Wno-long-long -c ../../../../tools/findImp.m -MT findImp.lo -MD -MP -MF 
.deps/findImp.TPlo >/dev/null 2>&1
mv -f .libs/findImp.lo findImp.lo
/bin/sh ../libtool --mode=link /Users/billn/Public/GNU/dst/bin/gcc 
-no-cpp-precomp  -g -O2 -fgnu-runtime -fno-strict-aliasing -Wall 
-Wno-import -Wno-protocol -Wno-long-long   -o findImp -L../src 
-L../libobjc findImp.lo -lswarm 
/Users/billn/Public/GNU/dst/bin/gcc -no-cpp-precomp -g -O2 -fgnu-runtime 
-fno-strict-aliasing -Wall -Wno-import -Wno-protocol -Wno-long-long -o 
.libs/findImp findImp.o 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/libobjc 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/.libs -lswarm 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/space 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/analysis 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/simtoolsgui 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/simtools 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/random 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/tkobjc 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/tclobjc 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/objectbase 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/activity 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/defobj 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/collections 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/misc 
-L/usr/lib -L/usr/local/lib -L/usr/X11R6/lib 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/space/.libs 
-lspace 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/analysis/.libs 
-lanalysis 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/simtoolsgui/.libs 
-lsimtoolsgui 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/simtools/.libs 
-lsimtools 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/random/.libs 
-lrandom 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/tkobjc/.libs 
-ltkobjc 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/tclobjc/.libs 
-ltclobjc 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/objectbase/.libs 
-lobjectbase 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/activity/.libs 
-lactivity 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/defobj/.libs 
-ldefobj 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/collections/.libs 
-lcollections 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/src/misc/.libs 
-lmisc 
-L/Users/billn/Public/Swarm/swarmgo/macosx/swarmx/build/libobjc/.libs 
-lobjc -lgcc -lBLT24 -ltk8.4 -ltcl8.4 -lXpm -lz -lX11 -lm -ldl 
gcc: unrecognized option `-no-cpp-precomp'
/usr/bin/ld: warning multiple definitions of symbol _tclStubsPtr
/usr/local/lib/libtk8.4.dylib(tclStubLib.o) definition of _tclStubsPtr
/usr/local/lib/libtcl8.4.dylib(tclStubLib.o) definition of _tclStubsPtr
/usr/bin/ld: warning multiple definitions of symbol _tclIntStubsPtr
/usr/local/lib/libtk8.4.dylib(tclStubLib.o) definition of _tclIntStubsPtr
/usr/local/lib/libtcl8.4.dylib(tclStubLib.o) definition of _tclIntStubsPtr
/usr/bin/ld: warning multiple definitions of symbol _tclPlatStubsPtr
/usr/local/lib/libtk8.4.dylib(tclStubLib.o) definition of _tclPlatStubsPtr
/usr/local/lib/libtcl8.4.dylib(tclStubLib.o) definition of 
_tclPlatStubsPtr
/usr/bin/ld: warning multiple definitions of symbol _tclIntPlatStubsPtr
/usr/local/lib/libtk8.4.dylib(tclStubLib.o) definition of 
_tclIntPlatStubsPtr
/usr/local/lib/libtcl8.4.dylib(tclStubLib.o) definition of 
_tclIntPlatStubsPtr
/usr/bin/ld: warning multiple definitions of symbol _Tcl_InitStubs
/usr/local/lib/libtk8.4.dylib(tclStubLib.o) definition of _Tcl_InitStubs
/usr/local/lib/libtcl8.4.dylib(tclStubLib.o) definition of _Tcl_InitStubs
/usr/bin/ld: Undefined symbols:
___objc_exec_class
_get_imp
_objc_lookup_class
and many many more!

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