[Python-Dev] what environment variable should contain compiler warning suppression flags? (original) (raw)

M.-A. Lemburg mal at egenix.com
Mon Jun 28 16:04:04 CEST 2010

Mark Dickinson wrote:

On Mon, Jun 28, 2010 at 12:38 PM, M.-A. Lemburg <mal at egenix.com> wrote:

On Sun, Jun 27, 2010 at 13:37, Jeffrey Yasskin <jyasskin at gmail.com> wrote:

On Sun, Jun 27, 2010 at 1:04 PM, Mark Dickinson <dickinsm at gmail.com> wrote:

I'm not sure I understand the importance of allowing ACPROGCC to set CFLAGS (if CFLAGS is undefined at the point of the ACPROGCC); can someone give an example of why this is necessary?

Marc-Andre's argument seems to be "it's possible that ACPROGCC adds other flags as well (it currently doesn't, but that may well change in future versions of autoconf)." That seems a little weak to constrain fixing actual problems today. If it ever adds more arguments, we'll need to inspect them anyway to see if they're more like -g or -O2 (wanted or harmful). Please see the discussion on the ticket for details. Yes, I've done that. It's repeatedly asserted in that discussion that ACPROGCC should be allowed to initialize an otherwise empty CFLAGS, but nowhere in that discussion does it explain why this is desirable. What would be so bad about not allowing ACPROGCC to initialize CFLAGS? (E.g., by setting an otherwise empty CFLAGS to '-g' before the ACPROGCC invocation.) That would fix the issue of the unwanted -O2 flag that ACPROGCC otherwise adds.

Why do you think that the default -O2 is unwanted and how do you know whether the compiler accepts -g as option ?

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