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4 Commits

Author SHA1 Message Date
Yi Kong 7db514064a Fix spurious Wunused-lambda-capture warning 
Summary:
Clang emits unused-lambda-capture warning for captures in generic lambdas even though they are actually used.

Fixes PR31815.

Reviewers: malcolm.parsons, aaron.ballman, rsmith

Reviewed By: malcolm.parsons

Subscribers: ahatanak, cfe-commits

Differential Revision: https://reviews.llvm.org/D33526

llvm-svn: 305315
 2017-06-13 18:38:31 +00:00
Malcolm Parsons ded2306208 [Sema] Improve side effect checking for unused-lambda-capture warning 
Summary:
Don't warn about unused lambda captures that involve copying a
value of a type that cannot be trivially copied and destroyed.

Fixes PR31977

Reviewers: rsmith, aaron.ballman

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D30327

llvm-svn: 296602
 2017-03-01 10:23:38 +00:00
Malcolm Parsons bece0cd512 [Sema] Reword unused lambda capture warning 
Summary:
The warning doesn't know why the variable was looked up but not
odr-used, so reword it to not claim that it was used in an unevaluated
context.

Reviewers: aaron.ballman

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D28902

llvm-svn: 292498
 2017-01-19 17:19:22 +00:00
Malcolm Parsons 87a036259b [Sema] Add warning for unused lambda captures 
Summary:
Warn when a lambda explicitly captures something that is not used in its body.

The warning is part of -Wunused and can be enabled with -Wunused-lambda-capture.

Reviewers: rsmith, arphaman, jbcoe, aaron.ballman

Subscribers: Quuxplusone, arphaman, cfe-commits

Differential Revision: https://reviews.llvm.org/D28467

llvm-svn: 291905
 2017-01-13 15:01:06 +00:00