[Bug libstdc++/18644] [3.3/3.4/4.0 regression] -Wsynth warning in <complex>

[Gabriel Dos Reis]

"bangerth at ices dot utexas dot edu" <gcc-bugzilla@gcc.gnu.org> writes:

| > The diagnostic is nonsensical.  The fix is to fix the diagnostic, not
| > to paper over the problem.
| 
| That's certainly the best solution. -Wsynth should just not trigger in 
| libstdc++ headers.

yes, and even more in user codes where it does not make sense.
Remember, we're currently compiling programs with ISO rules, and we
have very very little provisions to compile programs with cfront rules
(and you'd have to specify which version of cfront).

-- Gaby