http://llvm.org/bugs/show_bug.cgi?id=18429
Bug ID: 18429
Summary: false-negative for -Wunreachable-code
Product: clang
Version: 3.3
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 11855
--> http://llvm.org/bugs/attachment.cgi?id=11855&action=edit
missing -Wunreachable-code warning
-Wunreachable-code warning should be reported in cases like this:
unsigned int n = 0;
if (n == 0)
return 1;
else
return 2; // dead code
Note that if I manually constant-fold n to 0, then -Wunreachable-code is
reported:
if (0)
return 1;
else
return 2; // dead code
Also note that with "-O1" dead code is actually eliminated.
See full example in attachment. Compiles without warnings:
$ clang -O1 -Wunreachable-code wunreachable_code_false_negative.c
$
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