http://llvm.org/bugs/show_bug.cgi?id=12717
Bug #: 12717
Summary: Incorrect lexing of pp-numbers in C++11 due to
hexfloat extension
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++11
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Clang support C99 hexadecimal literals as an extension in its C++ modes. This
is *almost* a conforming extension in C++98 mode, but it's far from being one
in C++11 mode. For instance, in C++98:
#define PREFIX(x) foo ## x
void f() {
int PREFIX(1p);
int PREFIX(2p) = PREFIX(1p+5); // incorrect error: foo1p+5 is not a pp-token
}
In the rules of C++, "1p+5" is three tokens, not one.
In C++11, this goes wrong in much less contrived situations:
Units<Amp> operator"" _amp(unsigned long long d);
int k = 4_amp+1; // incorrect error: no literal operator "" _amp+1
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