Re: [U-Boot] without board level config.mk How to add CPPFLAGS

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So I want add "-iquote my/header/dir" to CPPFLAGS

This will not be accepted.

Does this means that there are no way to append custom cpp flags to CPPFLAGS ?

No, it means that your approach to include out-of-tree files has been rejected. Nothing more and not less.

And then how to do that thing : Append custom cpp flags to CPPFLAGS ?

e.g. -Wcomments

And after append them to CPPFLAGS, Does these flags appear in CFLAGS auto automatically ?