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Re: Wrong order of preprocessor and compiler flags

From: Sam James
Subject: Re: Wrong order of preprocessor and compiler flags
Date: Thu, 24 Mar 2022 15:41:04 +0000

> On 24 Mar 2022, at 14:42, Bob Friesenhahn <> 
> wrote:
> On Thu, 24 Mar 2022, Evgeny Grin wrote:
>> It's not uncommon to use CFLAGS for macros or for '-I' flags.
>> I think it's easy to imagine other conflicting situation where the order of 
>> used flags is significant.
> It may not be uncommon, but it is a usage bug to use CFLAGS for pre-processor 
> options.  Such usages should be corrected.
> Becides cases where the pre-processor may be used directly (not sure if there 
> are any), it should be considered that CPPFLAGS works for both the C and C++ 
> compilers but CFLAGS is only for the C compiler.
>> Usage of CPPFLAGS before CFLAGS looks logical for me, I think autoconf 
>> should be fixed.
> It does feel more logical.

Agreed on both counts & with the original post. We handle stuff like this quite 
often downstream and would be glad to see this.


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