http://llvm.org/bugs/show_bug.cgi?id=11274
Bug #: 11274
Summary: Missing warning for -Wconversion with compound
assignment
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
A warning is not generated for the compound assignment case, though it is for
standard operation + assignment.
Simple test case:
int main() {
uint8_t a = 1;
a <<= 1; // missing warning
uint8_t b = 1;
b = b << 1; // warns correctly
}
Generates a warning only for b, but not for a:
conv.c:9:6: warning: implicit conversion loses integer precision: 'int' to
'uint8_t'
(aka 'unsigned char') [-Wconversion]
b = b << 1;
~ ^~~~~~
gcc v4.5 gets this right:
conv.c:6:2: warning: conversion to ‘uint8_t’ from ‘int’ may alter its value
conv.c:9:2: warning: conversion to ‘uint8_t’ from ‘int’ may alter its value
By my reading of 6.5.16.2 Compound assignment, the two should be consistent.
For the other operators, each operand shall have arithmetic type consistent
with those
allowed by the corresponding binary operator.
--
First bug report of any kind to llvm, I believe I've followed preferred style /
info, please let me know if otherwise.
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