http://llvm.org/bugs/show_bug.cgi?id=2279
Summary: Conformance problems with pp expressions
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: preprocessor
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
These are conformance problems I'm aware of regarding PP expressions. If you
need a testcase I can provide, but they should be obvious from the
descriptions:
a) Comma subexpressions are permitted in C99 as long as they are unevaluated.
Clang rejects them, which is correct behaviour for C90 but not C99 (see 6.6).
b) Clang doesn't follow the grammar for the 2nd operand of the conditional
operator.
c) Clang doesn't follow the rules for the signedness of the result of the shift
operators (no UAC).
d) Clang seems to have issues with unevaluated subexpressions. Here are two
examples:
#if 0 ? 1/0: 2
#else
#error
#endif
#if 1 || 1/0
#else
#error
#endif
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