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lint: don't use 'long' in diagnostics The size of 'long' differs between 64-bit and 32-bit platforms. Eliminate this possible platform-dependency.
lint: clean up the wording of a few diagnostics
lint: warn about function definitions without header declaration The existing warning was only issued for function declarations, not for function definitions. The interesting change in the tests is in msg_351.c. Many other tests use non-static functions due to their syntactic brevity. In these tests, the warning is disabled individually, to allow new functions to be added without generating warning 351.
tests/lint: add tests for a few more messages
lint: force each test to declare the expected diagnostics By listing the expected diagnostics directly at the code that triggers the diagnostics, it is easier to cross-check whether the diagnostics make sense. No functional change to lint itself.
lint: add a test for each message produced by lint1 Having a test for each message ensures that upcoming refactorings don't break the basic functionality. Adding the tests will also discover previously unknown bugs in lint. The tests ensure that every lint message can actually be triggered, and they demonstrate how to do so. Having a separate file for each test leaves enough space for documenting historical anecdotes, rationale or edge cases, keeping them away from the source code. The interesting details of this commit are in Makefile and t_integration.sh. All other files are just auto-generated. When running the tests as part of ATF, they are packed together as a single test case. Conceptually, it would have been better to have each test as a separate test case, but ATF quickly becomes very slow as soon as a test program defines too many test cases, and 50 is already too many. The time complexity is O(n^2), not O(n) as one would expect. It's the same problem as in tests/usr.bin/make, which has over 300 test cases as well.