In a build I am doing I have a Makefile that invokes a python script which, in turn, executes /bin/xlc (a shell script that eventually invokes the C compiler). It works fine when I go via the fork()/exec() method but when I use spawn() I am getting a code of 126 with no other messages. I created a simple test case but it works. So I am looking at using BPXTRACE, which I only just found thanks to another group member. I am trying to understand how to invoke it so it traces all the processes created when I run the make command but am unsure of the command or sequence of commands required.
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