Have a single top-level main for running unit-tests

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.

1 files changed, 2 insertions, 8 deletions

diff --git a/src/gistatic.c b/src/gistatic.c
index a2b10fc..0a65b6c 100644
--- a/src/gistatic.c
+++ b/src/gistatic.c
@@ -1,4 +1,5 @@
 #include "config.h"
+#include "tar.h"
 #include "gistatic.h"
 
 #include <stdlib.h>
@@ -2046,7 +2047,7 @@ cleanup:
 }
 
 #ifdef TEST
-static void unit_tests(){
+void unit_tests_gistatic(void) {
 	dump_translatable_strings();
 
 	git_libgit2_init();
@@ -2182,10 +2183,3 @@ cleanup:
 	}
 	return ret;
 }
-
-#ifdef TEST
-int main(void) {
-	unit_tests();
-	return EXIT_SUCCESS;
-}
-#endif