Hey All-
The -fgnu-runtime is for using the runtime that comes with the GNU compiler
(gcc).
More specifically, it is for telling GCC to use the runtime that comes with
GCC. If you wish to use the GCC runtime with clang, the correct flag is
-fobjc-runtime=gcc (optionally with a version, though clang currently ignores
the version because it doesn’t know of any changes to the GCC runtime ABI since
clang shipped - I don’t think there are any).
I just wanted to let people know that this was fixed when I upgrade my
gnustep-make from 2.6.x to 2.7.0, which has support for the
--with-library-combo=ng-gnu-gnu option. That stopped the -fgnu-runtime flag
from being issued, and C++ exceptions now work in my ObjC++ code.
I did encounter one other issue: the linker complained that it could not find
libobjcxx.so.4.6, needed by libobjc.so, even though those are in the same
directory, and there is a "libobjcxx.so" symlink that points to
libobjcxx.so.4.6. The directory is being specified in the -L options, and it's
clearly being found, because libobjc.so is found there:
$ ls -l libobj*
lrwxrwxrwx 1 dlobron staff 14 Dec 1 16:08 libobjc.so -> libobjc.so.4.6
-rw-r--r-- 1 dlobron staff 246455 Dec 1 16:08 libobjc.so.4.6
lrwxrwxrwx 1 dlobron staff 16 Dec 1 16:08 libobjcxx.so -> libobjcxx.so.4.6
-rw-r--r-- 1 dlobron staff 19112 Dec 1 16:08 libobjcxx.so.4.6
I worked around this by adding "-l :libobjcxx.so" to my link options, which
fixed the problem. However, I'm curious as to why the linker doesn't find
libobjcxx.so on its own, without the explicit -l prompt. I've copied the link
command and error below, in case any compiler/linker expert has knowledge of
this.
Thanks again for all the help here.
--David
Linker error that occurs when linking my program:
/home/dlobron/build/clangport/akamai/llvm/llvm-5.0.0.install/bin/clang++
-rdynamic -m64 -rdynamic -pthread -fexceptions
-fobjc-runtime=gnustep-1.8 -fblocks -o obj/mapmaker \
./obj/mapmaker.obj/FirstPointDomainAdditions.m.o
./obj/mapmaker.obj/PropertyInstanceAdditions.m.o
./obj/mapmaker.obj/DsaRebaser.mm.o ./obj/mapmaker.obj/DynamicConfig.mm.o
./obj/mapmaker.obj/GeoTreeParser.mm.o
./obj/mapmaker.obj/FallBackTreeRebaser.mm.o
./obj/mapmaker.obj/IpWatchRebaser.mm.o
./obj/mapmaker.obj/LivenessModificationRebaser.mm.o
./obj/mapmaker.obj/LoadBalancer_config.mm.o
./obj/mapmaker.obj/LoadBalancer.mm.o
./obj/mapmaker.obj/LocalityTreeRebaser.mm.o ./obj/mapmaker.obj/MapMaker.mm.o
./obj/mapmaker.obj/MapMakerMainFunc.mm.o
./obj/mapmaker.obj/MappingDecision.mm.o
./obj/mapmaker.obj/NameserverAssociationMessage.mm.o
./obj/mapmaker.obj/NameserverAssociationRebaser.mm.o
./obj/mapmaker.obj/NSDemandsRebaser.mm.o
./obj/mapmaker.obj/PingScoresRebaser.mm.o ./obj/mapmaker.obj/PingState.mm.o
./obj/mapmaker.obj/RegionSelector.mm.o
./obj/mapmaker.obj/ResourceAdditions.mm.o
./obj/mapmaker.obj/ResourceInstanceAdditions.mm.o
./obj/mapmaker.obj/RunningAverage.mm.o ./obj/mapmaker.obj/ScoreList.mm.o
./obj/mapmaker.obj/SelectCenters.mm.o ./obj/mapmaker.obj/Statistics.mm.o
./obj/mapmaker.obj/StatisticsXMLWriter.mm.o
./obj/mapmaker.obj/TimeOfDayRebaser.mm.o ./GeoMap/obj/subproject.o
./Resources/obj/subproject.o ./Utils/obj/subproject.o \
-L../common/lib -L/home/dlobron/GNUstep/Library/Libraries
-L/home/dlobron/build/clangport/akamai/common/GNUstep/Local/Library/Libraries
-L/home/dlobron/build/clangport/akamai/common/GNUstep/System/Library/Libraries
-lFirstPointKit -lAkamaiKit -lXMLKit -lgtmcidrdbv6 -lloadbalancer
-lmapmessagestracecollector -lmapdispatch -lcci -lmapmessagesdatacenterstate
-lmapmessagesmapmakerheavymappingsummary -lmapmessagesnameserverassociation
-lmapmessagesrdp -lswanslib -lmaputils -lmapuuid -lmapfilelog -lradtreev6
-lakamai -lasci -laks -lakautil -lakastack -lopenssl -lz -lunwind -lbfd
-liberty -lresolv -lpthread -lgnustep-base -lpthread -lobjc
-fobjc-nonfragile-abi -lm
/usr/bin/ld.bfd.real: ./obj/mapmaker.obj/DsaRebaser.mm.o: undefined reference
to symbol '_ZTVN7gnustep7libobjc22__objc_class_type_infoE'
/home/dlobron/build/clangport/akamai/common/lib/libobjcxx.so.4.6: error adding
symbols: DSO missing from command line
clang-6.0: error: linker command failed with exit code 1 (use -v to see
invocation)
The symbol is in libobjcxx.so:
$ nm -C ../common/lib/libobjcxx.so|grep -i objc_class_type_i|grep typeinfo
0000000000202d20 D typeinfo for gnustep::libobjc::__objc_class_type_info
0000000000001d40 R typeinfo name for gnustep::libobjc::__objc_class_type_info
Linking works when "-l :libobjcxx.so" is added:
$ cat link.sh
#!/bin/bash
/home/dlobron/build/clangport/akamai/llvm/llvm-5.0.0.install/bin/clang++
-rdynamic -m64 -rdynamic -pthread -fexceptions
-fobjc-runtime=gnustep-1.8 -fblocks -o obj/mapmaker \
./obj/mapmaker.obj/FirstPointDomainAdditions.m.o
./obj/mapmaker.obj/PropertyInstanceAdditions.m.o
./obj/mapmaker.obj/DsaRebaser.mm.o ./obj/mapmaker.obj/DynamicConfig.mm.o
./obj/mapmaker.obj/GeoTreeParser.mm.o
./obj/mapmaker.obj/FallBackTreeRebaser.mm.o
./obj/mapmaker.obj/IpWatchRebaser.mm.o
./obj/mapmaker.obj/LivenessModificationRebaser.mm.o
./obj/mapmaker.obj/LoadBalancer_config.mm.o
./obj/mapmaker.obj/LoadBalancer.mm.o
./obj/mapmaker.obj/LocalityTreeRebaser.mm.o ./obj/mapmaker.obj/MapMaker.mm.o
./obj/mapmaker.obj/MapMakerMainFunc.mm.o
./obj/mapmaker.obj/MappingDecision.mm.o
./obj/mapmaker.obj/NameserverAssociationMessage.mm.o
./obj/mapmaker.obj/NameserverAssociationRebaser.mm.o
./obj/mapmaker.obj/NSDemandsRebaser.mm.o
./obj/mapmaker.obj/PingScoresRebaser.mm.o ./obj/mapmaker.obj/PingState.mm.o
./obj/mapmaker.obj/RegionSelector.mm.o
./obj/mapmaker.obj/ResourceAdditions.mm.o
./obj/mapmaker.obj/ResourceInstanceAdditions.mm.o
./obj/mapmaker.obj/RunningAverage.mm.o ./obj/mapmaker.obj/ScoreList.mm.o
./obj/mapmaker.obj/SelectCenters.mm.o ./obj/mapmaker.obj/Statistics.mm.o
./obj/mapmaker.obj/StatisticsXMLWriter.mm.o
./obj/mapmaker.obj/TimeOfDayRebaser.mm.o ./GeoMap/obj/subproject.o
./Resources/obj/subproject.o ./Utils/obj/subproject.o \
-l :libobjcxx.so \
-L../common/lib -L/home/dlobron/GNUstep/Library/Libraries
-L/home/dlobron/build/clangport/akamai/common/GNUstep/Local/Library/Libraries
-L/home/dlobron/build/clangport/akamai/common/GNUstep/System/Library/Libraries
-lFirstPointKit -lAkamaiKit -lXMLKit -lgtmcidrdbv6 -lloadbalancer
-lmapmessagestracecollector -lmapdispatch -lcci -lmapmessagesdatacenterstate
-lmapmessagesmapmakerheavymappingsummary -lmapmessagesnameserverassociation
-lmapmessagesrdp -lswanslib -lmaputils -lmapuuid -lmapfilelog -lradtreev6
-lakamai -lasci -laks -lakautil -lakastack -lopenssl -lz -lunwind -lbfd
-liberty -lresolv -lpthread -lgnustep-base -lpthread -lobjc
-fobjc-nonfragile-abi -lm
$ ./link.sh
$
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