Suggested warning: "./include/pch.h.gch: not used because -save-temps specified"

[Devang Patel]

On Oct 6, 2003, at 6:31 AM, Carlo Wood wrote:

> It would be less confusing that when -Winvalid-pch and -save-temps
> are used together, a warning simular to the one for -pipe is given.
>
> Any opinions?

When -save-temps is used, compiler (cc1*) is invoked twice.
First time, to generate preprocessed file and second time
to compile the preprocessed file. When compiler is invoked
to just preprocess file (means flag_preprocess_only), cpplib
call backs for PCH are not initialized. So it does not even
try to use PCH, hence no warning even though -Winvalid-pch is
supplied.

--
Devang