https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79433
--- Comment #22 from Marc Mutz <marc.mutz at kdab dot com> --- (In reply to Jonathan Wakely from comment #18) > I've started a discussion about changing the SD-6 recommendations. > > One idea that came out of the discussion so far would be to make a > GCC-specific extension to __has_include. If the has-includes-expression > finds a file then it could read the first line of the file to look for > something like: > > #pragma GCC has_include(constant-expression) > > If found, the result of the has-include-expression would be 1 if the > constant-expression is non-zero, and 0 otherwise. > > Then we could decorate our C++17 headers with: > > #pragma GCC has_include(__cplusplus > 201402L) > > and __has_include would magically give the right answer. Would that make its way into GCC 7, so we (Qt) could rely on it working at least for the C++17 headers (C++14 didn't add many/any)?
