https://bugs.llvm.org/show_bug.cgi?id=36186
Bug ID: 36186
Summary: False negatives for -Wconstant-conversion in enums
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: smee...@fb.com
CC: compn...@compnerd.org, dgre...@apple.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
% cat enum.cpp
enum { A = 128 };
void f(signed char);
void g() { f(A); }
% clang -target x86_64-linux -fsyntax-only -Wconstant-conversion enum.cpp
The implicit conversion from the enumeration type (which should be an unsigned
8 bit type) to the function parameter (a signed 8 bit type) causes a value
change from 128 to -128, but -Wconstant-conversion doesn't catch that. Upping
the enumeration value to anything above 255 shows the expected diagnostic.
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