4 Commits

Author	SHA1	Message	Date
Aaron Ballman	2cb2cd242c	Change the behavior of implicit int diagnostics ... C89 allowed a type specifier to be elided with the resulting type being int, aka implicit int behavior. This feature was subsequently removed in C99 without a deprecation period, so implementations continued to support the feature. Now, as with implicit function declarations, is a good time to reevaluate the need for this support. This patch allows -Wimplicit-int to issue warnings in C89 mode (off by default), defaults the warning to an error in C99 through C17, and disables support for the feature entirely in C2x. It also removes a warning about missing declaration specifiers that really was just an implicit int warning in disguise and other minor related cleanups.	2022-05-04 08:35:47 -04:00
Aaron Ballman	7de7161304	Use functions with prototypes when appropriate; NFC ... A significant number of our tests in C accidentally use functions without prototypes. This patch converts the function signatures to have a prototype for the situations where the test is not specific to K&R C declarations. e.g., void func(); becomes void func(void); This is the sixth batch of tests being updated (there are a significant number of other tests left to be updated).	2022-02-09 17:16:10 -05:00
Reid Kleckner	1ace0049fe	Add test coverage for recent behavior change in GNU line marker pre-processing ... llvm-svn: 303642	2017-05-23 16:09:13 +00:00
Reid Kleckner	eb00ee07be	Give files from #line the characteristics of the current file ... This allows #line directives to appear in system headers that have code that clang would normally warn on. This is compatible with GCC, which is easy to test by running `gcc -E`. Fixes PR30752 llvm-svn: 303582	2017-05-22 21:42:58 +00:00