[Bug c/78000] -Wimplicit-function-declaration inhibited with macro from system headers

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78000

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
As I've said before, we have to stop doing individual ad hoc fixes for 
bugs like this; there are too many of them.  We have to work out the 
general principles for which warnings should or should not be inhibited 
for macros from system headers (roughly, the question is whether the macro 
or its user is responsible for the warning) and then design APIs that make 
it easy to get it right for each individual warning - and review existing 
warnings systematically.  Failing that, disable inhibiting such warnings 
for macros from system headers globally.