I should have been clearer in my initial post regarding what doesn't
currently work in clang.
clang croaks on the following:
void test() {
const int x = 10;
auto L = [&j = x](int i) { };
}
We get the following error:
- error: variable 'x' cannot be implicitly captured in a lambda with no
capture-default specified
The reason is that the init-capture's init-expr doesn't actually get analyzed
for any lvalue-to-rvalue conversions during the initial parsing and creation of
declrefexprs. All declrefexprs of variables that do not involve constants, get
appropriately tagged for odr-use and capture. But for constants that might not
be odr-used, this ends up happening later once the lambda's call operator has
been pushed on the declcontext stack, and so 'x' is attempted to be captured by
the lambda, which seems wrong.
So the patch attempts to move up the creation of the init-var and analysis of
the init-expr.
Thanks!
http://llvm-reviews.chandlerc.com/D2092
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