[Bug c/86134] earlier diagnostic causes followup diagnostic about unknown -Wno-* options

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86134

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|earlier error causes        |earlier diagnostic causes
                   |followup diagnostic about   |followup diagnostic about
                   |unknown -Wno-* options      |unknown -Wno-* options
      Known to fail|                            |4.8.5, 8.1.0

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

> echo 'int main(){}' | gcc -S -x c -Wno-unknown-warning-option -Wall -Werror -Wno-error=return-type -
<stdin>: In function ‘main’:
<stdin>:1:1: warning: control reaches end of non-void function [-Wreturn-type]
<stdin>: At top level:
cc1: error: unrecognized command line option "-Wno-unknown-warning-option"
[-Werror]
cc1: all warnings being treated as errors
> echo $?
1

> echo 'int main(){}' | gcc -S -x c -Wno-unknown-warning-option -Wreturn-type -
<stdin>: In function ‘main’:
<stdin>:1:1: warning: control reaches end of non-void function [-Wreturn-type]
<stdin>: At top level:
cc1: warning: unrecognized command line option "-Wno-unknown-warning-option"
[enabled by default]