Hi David and gnustep,
This test case works perfectly for me on FreeBSD, where clang defaults to
-fobjc-runtime=gnustep. It segfaults if I add -fobjc-runtime=gcc. This is
entirely expected, because the GCC ABI for exceptions is makes it impossible to
correctly interop with C++ (I spent a few weeks trying and it always fails for
at least some of the corner cases). If you specify -fobjc-runtime=gnustep-1.8,
then it will work correctly.
I updated my gnustep-make (version 2.6.0) to include -fobjc-runtime=gnustep-1.8
in ADDITIONAL_FLAGS, with the following change to common.make:
728a729,732
> # Specify the gnustep-1.8 runtime so we pick up the correct exception
> personalities
> # in ObjCC.
> ADDITIONAL_FLAGS += -fobjc-runtime=gnustep-1.8
This works as expected, as this sample compilation line that has the
-fobjc-runtime=gnustep-1.8 flag:
/home/dlobron/build/clangport/akamai/llvm/llvm-5.0.0.install/bin/clang++
ResourceAdditions.mm -c \
-MMD -MP -idirafter
/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/ext -DGNUSTEP
-DGNUSTEP_BASE_LIBRARY=1 -DGNU_RUNTIME=1 -DGNUSTEP_BASE_LIBRARY=1
-fno-strict-aliasing -fPIC -Wall -DGSWARN -DGSDIAGNOSE -Wno-import
-fobjc-runtime=gnustep-1.8 -mfpmath=sse -msse2 -fno-strict-aliasing -Wall
-Werror -Wno-multichar -DHAVE_CONFIG_H -D_GNU_SOURCE -m64 -march=opteron
-mno-3dnow -ggdb -O2 -Wall -fPIC -fPIC -fgnu-runtime -std=c++11
-fconstant-string-class=NSConstantString -I ../common/include -I.
-I/home/dlobron/GNUstep/Library/Headers
-I/home/dlobron/build/clangport/akamai/common/GNUstep/Local/Library/Headers
-I/home/dlobron/build/clangport/akamai/common/GNUstep/System/Library/Headers
However, I'm still getting the same result: C++ exception objects are nil when
caught in Objective-C++ code (.mm files). As I mentioned, I'm using libobjc2
and building with clang. This error does not occur when I build with gcc, nor
with clang on a Mac - only clang on Linux.
Is it possible that some key part of my compilation is missing
-fobjc-runtime=gnustep-1.8? It appears everywhere I can think to look, and
ADDITIONAL_FLAGS does seem like the right place to put it. Please let me know
if there is something else I might check. I did notice that the flag
"-fgnu-runtime" appears in my compilation line - could that value be incorrect?
Thank you,
David
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