https://llvm.org/bugs/show_bug.cgi?id=26852
Bug ID: 26852
Summary: false negative for -Wconstant-logical-operand in C++
mode, not in C
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: ed0.88.p...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Consider this snippet code:
$ cat enum_constant_operand.cpp
int bar();
typedef enum
{
X = 1,
Y = 2,
Z = 4,
} val_t;
int foo()
{
int val = bar();
return (val == X || Y || Z);
}
EOF
If it's compiled in C mode, it reports:
$ clang++ -x c enum_constant_operand.cpp -fsyntax-only
enum_constant_operand.cpp:13:19: warning: use of logical '||' with constant
operand [-Wconstant-logical-operand]
return (val == X || Y || Z);
^ ~
enum_constant_operand.cpp:13:19: note: use '|' for a bitwise operation
return (val == X || Y || Z);
^~
|
enum_constant_operand.cpp:13:24: warning: use of logical '||' with constant
operand [-Wconstant-logical-operand]
return (val == X || Y || Z);
^ ~
enum_constant_operand.cpp:13:24: note: use '|' for a bitwise operation
return (val == X || Y || Z);
^~
|
2 warnings generated.
$
If it's compiled in C++, it won't report anything:
$ clang++ enum_constant_operand.cpp -fsyntax-only
$
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