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7 Commits

Author SHA1 Message Date
Aaron Ballman 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. 
llvm-svn: 224465
 2014-12-17 21:57:17 +00:00
Aaron Ballman 78ecb8737d No longer emit diagnostics about unused results (comparisons, etc) from unevaluated contexts. Fixes PR18571. 
llvm-svn: 219954
 2014-10-16 20:13:28 +00:00
Benjamin Kramer 9940a5df86 Sema: Simplify the check if a method returns an instance of the class. 
Just checking if the parent of the method is the same as the return type
should be sufficient. Also fixes PR17587.

llvm-svn: 192802
 2013-10-16 16:21:04 +00:00
Kaelyn Uhrain 1137001938 For classes that have the warn_unused_result attribute, don't apply the 
attribute to the class' methods even when they return an instance of the
class (e.g. assignment operators).

llvm-svn: 167873
 2012-11-13 21:23:31 +00:00
Kaelyn Uhrain 3d699e02ae A couple of small fixes to r167783 
llvm-svn: 167791
 2012-11-13 00:18:47 +00:00
Kaelyn Uhrain 8681f9d46d Enable C++11 attribute syntax for warn_unused_result and allow it to be 
applied to CXXRecordDecls, where functions with that return type will
inherit the warn_unused_result attribute.

Also includes a tiny fix (with no discernable behavior change for
existing code) to re-sync AttributeDeclKind enum and
err_attribute_wrong_decl_type with warn_attribute_wrong_decl_type since
the enum is used with both diagnostic messages to chose the correct
description.

llvm-svn: 167783
 2012-11-12 23:48:05 +00:00
Chandler Carruth d05b352b0e Clean up the tests for warning about unused function results given the 
appropriate attribute. Add a bit more testing that finds a pretty bad
regression (since ~forever) in this warning. Fix it with a nice 2 line
change. =]

llvm-svn: 126098
 2011-02-21 00:56:56 +00:00