[Bug preprocessor/89808] An option to disable warning "#pragma once in main file"

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89808

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-03-25
          Component|c++                         |preprocessor
            Version|unknown                     |8.3.1
     Ever confirmed|0                           |1
           Severity|normal                      |enhancement

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testcase:

#pragma once
int main() {}

> g++ t.C -S
t.C:1:9: warning: #pragma once in main file
 #pragma once
         ^~~~


you could work around this by wrapping the pragma in a preprocessor
conditional