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tests/lint: add a few more tests to increase code coverage
lint: increase debug logging for declarations All changes to the global variable 'dcs' are tracked now, to help identify the cause of the failing tests in expr_sizeof and gcc_attribute_aligned. While here, test more invalid type combinations in typedefs.
lint: warn about extern declarations outside headers https://mail-index.netbsd.org/tech-userlevel/2023/03/15/msg013727.html
tests/lint: replace 'expect' comments with 'expect+-' comments The 'expect+-' comments provide more context, which makes it easier to read the .c files on their own, without having to look up the actual diagnostics in the .exp files. Add tests for messages 105 and 106, which were about the obscure feature of some traditional C compilers that allowed the expression 'x->member' to access a struct member, even if 'x' had integer type. The remaining tests will be migrated in a future commit.
tests/lint: document why lint does not need to detect wrong types
tests/lint: one comment per expected diagnostic This makes it possible to check for diagnostics that contain commas.
lint: add expections to tests msg_098: fix suffix for floating point constant msg_127: remove prototype msg_146: fix return type
lint: add a few more tests No serious bugs found this time.
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.