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unable to detect exception model

     I have run into a build problem with tonights gcc trunk on MacOS X which didn't exist in yesterdays
svn pull. The gcc trunk build on MacOS X 10.4.6 crashes with...

checking how to run the C++ preprocessor...  /sw/src/ -shared-libgcc -B/sw/src/ -nostdinc++ -L/sw/src/ -L/sw/src/ -B/sw/lib/gcc4/powerpc-apple-darwin8/bin/ -B/sw/lib/gcc4/powerpc-apple-darwin8/lib/ -isystem /sw/lib/gcc4/powerpc-apple-darwin8/include -isystem /sw/lib/gcc4/powerpc-apple-darwin8/sys-include -E
loading cache ./config.cache within ltconfig
checking host system type... powerpc-apple-darwin8
checking build system type... powerpc-apple-darwin8
checking for objdir... .libs
checking for /sw/src/ option to produce PIC... -fno-common -DPIC
checking if /sw/src/ PIC flag -fno-common -DPIC works... yes
checking if /sw/src/ static flag -static works... no
finding the maximum length of command line arguments... (cached) 196608
checking if /sw/src/ supports -c -o file.o... (cached) yes
checking if /sw/src/ supports -fno-rtti -fno-exceptions ... yes
checking whether the linker (/sw/src/ supports shared libraries... 
checking how to hardcode library paths into programs... unsupported
checking whether stripping libraries is possible... no
checking dynamic linker characteristics... darwin8 dyld
checking command to parse /sw/src/ output... failed
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
appending configuration tag "CXX" to libtool
checking for exception model to use... configure: error: unable to detect exception model
make[1]: *** [configure-target-libstdc++-v3] Error 1
make: *** [all] Error 2
### execution of /var/tmp/tmp.2.jzc1x4 failed, exit code 2
Failed: phase compiling: gcc4-4.1.999-20060623 failed

Any idea where this is coming from?

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