Undefined symbols for architecture x86_64:

  "SNESPicardComputeFunction(_p_SNES*, _p_Vec*, _p_Vec*, void*)", referenced from:

      _main in ex15.o

  "SNESPicardComputeJacobian(_p_SNES*, _p_Vec*, _p_Mat**, _p_Mat**, MatStructure*, void*)", referenced from:

      _main in ex15.o

ld: symbol(s) not found for architecture x86_64

collect2: ld returned 1 exit status

make: [ex15] Error 1 (ignored)

/bin/rm -f ex15.o

The error appears related to name mangling and can be fixed if I add:

extern "C" {

}

to the top of src/snes/tutorials/examples/ex15.c.  Note that this error does not occur if building PETSc with default 

settings where the C compiler is used to build the library and the example.

Thanks,

Travis

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