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Re: Wrong order of preprocessor and compiler flags

From: Nick Bowler
Subject: Re: Wrong order of preprocessor and compiler flags
Date: Thu, 24 Mar 2022 11:13:34 -0400

On 2022-03-23, Zack Weinberg <zack@owlfolio.org> wrote:
> On Wed, Mar 23, 2022, at 11:31 AM, Evgeny Grin wrote:
>> I've found that everywhere in autoconf scripts flags are used like:
>> $CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&AS_MESSAGE_LOG_FD
>> while automake and libtool use flags in the other order:
> I agree that this should be made consistent, but 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).


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