[llvm-bugs] [Bug 24771] New: Missed diagnostic in narrowing conversion from unscoped enum to floating
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llvm-bugs at lists.llvm.org
Thu Sep 10 08:21:19 PDT 2015
https://llvm.org/bugs/show_bug.cgi?id=24771
Bug ID: 24771
Summary: Missed diagnostic in narrowing conversion from
unscoped enum to floating
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangbugs at nondot.org
Reporter: andrey.vul at gmail.com
CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
Classification: Unclassified
A narrowing conversion from an unscoped enumeration to a floating-point type
fails to emit a -Wc++11-narrowing diagnostic.
If we try the same, -Wc++11-narrowing works as expected.
### SOURCE:
$ cat narrowing.cc
int x0 = 5;
double y0 = { x0 }; // (1)
enum { z1 = 5 } x1 = z1;
double y1 = { x1 }; // (2)
### COMPILER INVOCATION AND OUTPUT:
$ clang++ -std=c++11 -c -Werror=c++11-narrowing narrowing.cc
narrowing.cc:2:15: error: non-constant-expression cannot be narrowed from type
'int' to 'double' in initializer list [-Wc++11-narrowing]
double y0 = { x0 };
^~
### EXPECTED OUTPUT:
narrowing.cc:2:15: error: non-constant-expression cannot be narrowed from type
'int' to 'double' in initializer list [-Wc++11-narrowing]
double y0 = { x0 };
^~
narrowing.cc:4:15: error: non-constant-expression cannot be narrowed from type
'<anonymous enum>' to 'double' in initializer list [-Wc++11-narrowing]
double y1 = { x1 };
^~
NOTE: the second diagnostic was synthesized from gcc -Werror=narrowing
### COMPILER VERSION INFO:
clang version 3.8.0 (trunk 246556)
Target: powerpc64le-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/powerpc64le-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/powerpc64le-linux-gnu/4.8.2
Found candidate GCC installation: /usr/lib/gcc/powerpc64le-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/powerpc64le-linux-gnu/4.9.1
Selected GCC installation: /usr/lib/gcc/powerpc64le-linux-gnu/4.8
Candidate multilib: .;@m64
Selected multilib: .;@m64
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