6c93b3e29c
Adding a -Wunused-value warning for expressions with side effects used in an unevaluated expression context, such as sizeof(), or decltype(). Also adds a similar warning when the expression passed to typeid() *is* evaluated, since it is equally likely that the user would expect the expression operand to be unevaluated in that case.
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llvm-svn: 224465
2014-12-17 21:57:17 +00:00
e96dad9544
Don't warn about unused values in ternary ?: expressions unless both the LHS and RHS are "unused" (side-effect free).
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Patch by Justin Bogner! Fixes PR 8282.
llvm-svn: 126779
2011-03-01 20:34:48 +00:00
72664df103
Implement -Wunused-label.
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llvm-svn: 114315
2010-09-19 21:21:25 +00:00
9096341310
Warn when an expression result in a LabelStmt is unused.
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llvm-svn: 114314
2010-09-19 21:21:10 +00:00
639ffb0c07
Fix rdar://8139785 "implement warning on dead expression in comma operator"
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As a bonus, fix the warning for || and && operators; it was emitted even if one of the operands had side effects, e.g:
x || test_logical_foo1();
emitted a bogus "expression result unused" for 'x'.
llvm-svn: 107274
2010-06-30 10:53:14 +00:00
a1de6fc575
Include all warnings under '-Wunused' in '-Wmost' and '-Wall'.
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llvm-svn: 100786
2010-04-08 17:54:28 +00:00
43a9c9626f
Don't emit an 'unused expression' warning for '||' and '&&' expressions that contain assignments
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or similar side-effects.
llvm-svn: 100676
2010-04-07 18:49:21 +00:00
c493a73240
Improve the unused-value check to look into comma expressions and filter out
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voids in sub-expressions. Patch by Mike M!
Fixes PR4806.
llvm-svn: 98335
2010-03-12 07:11:26 +00:00
Aaron Ballman