Specify a unique temp file directory for each link step using the "-ft" shell option. The easiest thing to do would be to use a temp file directory based on the name of the output executable file directory, like so: cl2000 program.c -ft tmp/exe1 -O4 -z -o exe1/program.out

If multiple compiler invocations are running in parallel (such as with make -j), and both invocations link an executable object file with the same base name (excluding directory), and -O4 (link time optimization) is used, a race condition is created and one invocation might overwrite a temporary file used for link time optimization, corrupting one or both compilations. This problem would occur intermittently.