Bug 197819

While using google proto buffers, their compiler generates filenames such as "myfile.pb.h" and "myfile.pb.cc"

I added these files to my project. When built, the object file for this becomes myfile.pb.o

When creating the test the target required by the test binary becomes myfile.pb_nomain.o 

due to the following conversion rule 
OBJECTFILES:%.o=%_nomain.o

However, the rule that creates this object file is generated as:
${OBJECTDIR}/_ext/464988008/myfile_nomain.pb.o

Hence, when building test targets it gives an error saying it cant find rule for myfile.pb_nomain.o 

I think while creating the _nomain makefile rule for test targets it is looking for the first dot, rather than the last one that separates the .cc or cpp