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Instead of each .c file becoming a self-standing .t executable file,
and being run for executing the unit tests local to the file, now each
.c becomes a .to object (akin to a .o object, but one where the -DTEST
flag is given to the compiler). After that, all the .to objects are
linked together in a gistatic-tests executable, in a equivalent way
that all .o files get linked together in a gistatic executable.
This change was necessary in order to allow dependencies between
objects. The next task will be making a tar of a repository tree
checkout, and src/gistatic.{o,to} will start depending on
src/tar.{o,to}. If each file has its own main function when -DTEST is
given, then I wont be able to link them together.
I took the opportunity that I had to change the Makefile, and I
improved the dependency between targets and dependencies greatly. From
what I can tell now, it is correct.
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