Make QStringLiteral always choke on non-literals
The fallback implementation of QStringLiteral did not (up to now)
enforce the need to use a literal. So it was possible to write:
const char *foo = "Hello";
QString s = QStringLiteral(foo);
Which would do the wrong thing and create s == "Hel" on 32-bit
platforms (sizeof(foo) == 4) or, wrose, s == "Hello\0XY" on 64-bit
platforms (sizeof(foo) == 8, X and Y are garbage).
This change enforces the need for a literal by producing errors on the
above cases, as well as when foo is a char array variable.
GCC:
error: expected ‘)’ before ‘foo’
Clang (abbreviated):
error: expected ')'
namespace X { QString x() { const char foo[42] = "Hello"; return QStringLiteral(foo); } }
^
note: to match this '('
^
ICC:
error: expected a ")"
namespace X { QString x() { const char foo[42] = "Hello"; return QStringLiteral(foo); } }
^
The first C++11 error currently is:
error: expected primary-expression before ‘enum’ (GCC)
error: expected a ")" (ICC)
Change-Id: I317173421dbd7404987601230456471c93b122ed
Reviewed-by: hjk <qthjk@ovi.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>