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Re: [PATCH v3] configure: Fix default -O2 being added when CFLAGS not se

From: Daniel Kiper
Subject: Re: [PATCH v3] configure: Fix default -O2 being added when CFLAGS not set
Date: Thu, 14 Apr 2022 17:10:44 +0200
User-agent: NeoMutt/20170113 (1.7.2)

On Mon, Apr 11, 2022 at 12:49:01PM -0400, Robbie Harwood wrote:
> Glenn Washburn <> writes:
> > Autoconf will set a default CFLAGS of "-g -O2" if CFLAGS is not set. CFLAGS
> > was defaulted to "" early in configure to prevent this. A recent commit
> > ad9ccf660013c208077b1e983d6c824df25ed1cf ("configure: Fix various new
> > autotools warnings") added AC_USE_SYSTEM_EXTENSIONS, which pulls in the
> > autoconf CFLAGS check, before we default CFLAGS and thus setting the
> > autoconf default for CFLAGS. Move the default setting of CFLAGS to before
> > AC_USE_SYSTEM_EXTENSIONS so that autoconf will see CFLAGS as set and not
> > give it a default.
> >
> > CFLAGS is also moved above AC_CONFIG_AUX_DIR, because CFLAGS should be
> > defaulted to "" as soon as possible to catch any autoconf macros that try
> > to use some other default. Regardless, this currently has no effect as that
> > macro does not consider the CFLAGS variable.
> >
> > Signed-off-by: Glenn Washburn <>
> Reviewed-by: Robbie Harwood <>

Reviewed-by: Daniel Kiper <>


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