Re: Wrong order of preprocessor and compiler flags

On Thu, Mar 24, 2022, at 11:13 AM, Nick Bowler wrote:
> On 2022-03-23, Zack Weinberg <[email protected]> wrote:
>> ... before we change
>> anything, we need to check what the rules *built into GNU and BSD
>> Make* do with CFLAGS and CPPFLAGS (and also CXXFLAGS, OBJCFLAGS, etc)
>> because those are much much harder to get changed than anything in
>> Automake or Autoconf, so we should aim to harmonize everything with
>> them.
>
> Practically all make implementations use the $(CFLAGS) $(CPPFLAGS)
> ordering in their builtin .c.o inference rules.
>
> However, GNU coding standards state that CFLAGS should be the last
> item on compilation commands, so it would appear that this is a case
> where traditional "make" behaviour contrasts with GNU standards (which
> Automake is following).

Huh.  Is there a rationale given in the coding standard?  If not, do you have any idea who might remember the rationale?

zw