Re: [U-Boot] [PATCH] fdt: Enhance dts/Makefile to be all things to all men

[Wolfgang Denk <wd-ynQEQJNshbs@public.gmane.org>]

Dear Stephen,

In message <51A634B5.5060309-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> you wrote:
>
> > I think this is not a good way to address this issue.  The GCC
> > documentation (section "System-specific Predefined Macros" [1])
> > desribes how this should be handled.  The "correct" (TM) way to fix
> > this is by adding "-ansi" or any "-std" option that requests strict
> > conformance to the compiler/preprocessor command line.
> > 
> > [1] http://gcc.gnu.org/onlinedocs/cpp/System_002dspecific-Predefined-Macros.html#System_002dspecific-Predefined-Macros
> 
> -ansi at least was considered when the Linux kernel patches for dtc+cpp
> support were being developed, but it was rejected. While it possibly

Can you provide references?  I'd like to understand why it was
rejected - it seems to be the "official" approach to the problem.

> does solve this specific issue fine, there were other more general
> problems; IIRC (and I might not) it completely changes the way macro
> expansion happens, which results in it being pretty useless. Hence, "-x
> assembler-with-cpp" was chosen over e.g. "-ansi".

Again, do you have any reference?  "completely changes the way macro
expansion happens" sounds terribly dangerous, so it would be better to
know about that exactly...

Best regards,

Wolfgang Denk

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