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2013-02-26Warn on dropping the return value from a warn_unused_result function, even inMatt Beaumont-Gay
macros. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176114 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-17Suppress all -Wunused-value warnings from macro body expansions.Matt Beaumont-Gay
This is inspired by a number of false positives in real code, including PR14968. I've added test cases reduced from these false positives to test/Sema/unused-expr.c, as well as corresponding test cases that pass the offending expressions as arguments to a no-op macro to ensure that we do warn there. This also removes my previous tweak from r166522/r166534, so that we warn on unused cast expressions in macro arguments. There were several test cases that were using -Wunused-value to test general diagnostic emission features; I changed those to use other warnings or warn on a macro argument expression. I stared at the test case for PR14399 for a while with Richard Smith and we believe the new test case exercises the same codepaths as before. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172696 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-24Address feedback from Eli Friedman on r166522.Matt Beaumont-Gay
In particular, we do want to warn on some unused cast subexpressions within macros. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166534 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-23Don't emit -Wunused-value warnings from macro expansions.Matt Beaumont-Gay
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166522 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-13c: small refactoring of checking for __attribute__(const))Fariborz Jahanian
per Richard's comment. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161786 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-13c: make __has_attribute(const) work for constFariborz Jahanian
function attribute. // rdar://10253857 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161767 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-24Add a warning to diagnose statements in C++ like "*(volatile int*)x;". ↵Eli Friedman
Conceptually, this is part of -Wunused-value, but I added a separate flag -Wunused-volatile-lvalue so it doesn't get turned off by accident with -Wno-unused-value. I also made a few minor improvements to existing unused value warnings in the process. <rdar://problem/11516811>. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157362 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-17Treating the unused equality comparisons as something other than part ofChandler Carruth
-Wunused was a mistake. It resulted in duplicate warnings and lots of other hacks. Instead, this should be a special sub-category to -Wunused-value, much like -Wunused-result is. Moved to -Wunused-comparison, moved the implementation to piggy back on the -Wunused-value implementation instead of rolling its own, different mechanism for catching all of the "interesting" statements. I like the unused-value mechanism for this better, but its currently missing several top-level statements. For now, I've FIXME-ed out those test cases. I'll enhance the generic infrastructure to catch these statements in a subsequent patch. This patch also removes the cast-to-void fixit hint. This hint isn't available on any of the other -Wunused-value diagnostics, and if we want it to be, we should add it generically rather than in one specific case. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137822 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-25Change the wording of the bad-decl-for-attribute warning and errorJohn McCall
to make it clear that we're talking about the declarations and not the types. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@124175 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-15testcase for http://llvm.org/PR8371 of my last commit, r116570Gabor Greif
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@116571 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-19Revert r114316, -Wunused-value enabled by default was intended.Argyrios Kyrtzidis
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@114318 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-19Make -Wunused-value off by default, matching GCC. Fixes rdar://7126194.Argyrios Kyrtzidis
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@114316 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-08Don't complain about an __builtin_va_arg expression's result beingDouglas Gregor
unused, since the operation has side effects. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@103360 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-06Devote a special diagnostic to the typoJohn McCall
(void*) someFunction(5, 10, 15, 20); where the cast is presumably meant to be to 'void'. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@100574 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-23Insulate these from changes to the default for -Wunreachable-code.Mike Stump
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@94326 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-08Use -fno-math-errno by default, and remove the IsMathErrnoDefaultDan Gohman
targethook, which is no longer being used. This fixes PR5971. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92987 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-30testcase for previous patch!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92317 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-22warn when attribute warn_unused_result is applied to void functions.Nuno Lopes
while at it, remove an outdated FIXME git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91946 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-20fix PR4010: add support for the warn_unused_result for function pointersNuno Lopes
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91803 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-15Update tests to use %clang_cc1 instead of 'clang-cc' or 'clang -cc1'.Daniel Dunbar
- This is designed to make it obvious that %clang_cc1 is a "test variable" which is substituted. It is '%clang_cc1' instead of '%clang -cc1' because it can be useful to redefine what gets run as 'clang -cc1' (for example, to set a default target). git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91446 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-19Switch -f{builtin,math-errno,rtti} and -analyzer-purge-dead to -...no... ↵Daniel Dunbar
variants instead of using llvm::cl::init(true) arguments. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@89315 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-13add rdar # I accidentally lost.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83942 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-13merge two tests.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83941 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-13make the diagnostic in the 'unused result' warning more preciseChris Lattner
about the reason, rdar://7186119. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83940 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-01More warnings for unused expressions.Anders Carlsson
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77763 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-30Diagnose unused expression results for all statements, just not compound ↵Anders Carlsson
statements. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77631 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-28fix PR4633: cast to void should silence the 'unused expression' warning.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77344 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-07Driver: Manually translate a number of -f with no- variants options toDaniel Dunbar
clang. - We will eventually want some more driver infrastructre for this probably. - For now, the clang-cc interface stays relatively the same, but we don't accept multiple instances anymore, or the [no-] variants directly. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68550 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-24Rename clang to clang-cc.Daniel Dunbar
Tests and drivers updated, still need to shuffle dirs. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67602 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-17add support for -fno-math-errno, and validate that it affects sema properly.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64708 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-17sema no longer explodes, yay!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64707 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-19Make the unused expression warning a bit less aggressive (found in PHP Eli Friedman
code). git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@51276 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-11rename -parse-ast-print to -ast-printChris Lattner
rename -parse-ast-dump to -ast-dump remove -parse-ast, which is redundant with -fsyntax-only git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42852 91177308-0d34-0410-b5e6-96231b3b80d8
2007-09-26Removed option "-parse-ast-check" from clang driver. This is now implementedTed Kremenek
using "-parse-ast -verify". Updated all test cases (using a sed script) that invoked -parse-ast-check to now use -parse-ast -verify. Fixed a bug where using "-verify" instead of "-parse-ast-check" would not correctly create the DiagClient needed to accumulate diagnostics. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42365 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-31Fix a bug/missing-feature Ted noticed: the 'unused' warning should notChris Lattner
warn about the last stmt in a stmtexpr, f.e. there should be no warning for: int maxval_stmt_expr(int x, int y) { return ({int _a = x, _b = y; _a > _b ? _a : _b; }); } git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41655 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-27Add Type::getAsBuiltinType() and Type::builtinTypesAreCompatible().Steve Naroff
Modified Type::typesAreCompatible() to use the above. This fixes the following bug submitted by Keith Bauer (thanks!). int equal(char *a, const char *b) { return a == b; } Also tweaked Sema::CheckCompareOperands() to ignore the qualifiers when comparing two pointer types (though it doesn't relate directly to this bug). git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41476 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-26Fix a bug reported by Keith BauerChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41452 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-21we now correctly emit:Chris Lattner
unused-expr.c:8:6: warning: comparison of distinct pointer types ('int volatile *' and 'int *') VP == P; ~~ ^ ~ git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41210 91177308-0d34-0410-b5e6-96231b3b80d8
2007-07-11Stage two of getting CFE top correct.Reid Spencer
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@39734 91177308-0d34-0410-b5e6-96231b3b80d8
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