On 2007-02-26 20:51:26 +0900, Paul Guyot wrote:
> On Feb 26, 2007, at 19:45, Vincent Lefevre wrote:
> >On 2007-02-26 13:45:09 +0900, Paul Guyot wrote:
> >>* you can add -O -g if the port requires it with just:
> >>configure.universal_cflags-append -O -g
> >
> >Why isn't -O (equivalent to -O1) used by default?
> >
> >It is regarded as stable by Apple (since it is in the tech note)
> >and is better than the default -O0 (no optimization).
First note that when I said "the default -O0", this is the default for
the *compiler* (here, gcc), not for the "configure" script. This is
important below...
> I think you might be over-interpreting Apple's choice with -O (and -
> g). Most configure-based software know how to configure their
> optimization options for both PPC and Intel builds and if they
> don't, then the portfile needs to fix it anyway, even for non-
> universal builds. Unless I missed something....
I think so. Many ports don't redefine CFLAGS, so that a default CFLAGS
will be set up by configure in the Makefile, and in general, a -O option
(-O1 or -O2 or ...) is added there. In fact, "-g -O2" seems to be the
default set up by autoconf when CFLAGS isn't defined. If a portfile
defines CFLAGS (e.g. via the universal variant), then I think you will
no longer have the autoconf default. Here's an example (with Mutt):
* If I configure Mutt without CFLAGS set, then I get in the Makefile
generated by configure:
CFLAGS = -Wall -pedantic -g -O2
* If I configure Mutt with ./configure CFLAGS="-Wall", then I get in
the Makefile generated by configure:
CFLAGS = -Wall -pedantic -Wall
Note: Mutt's configure.in adds "-Wall -pedantic", but you can see
the default "-g -O2" that comes from autoconf.
Now, I don't know if "-g -O2" is magically added by MacPorts internals.
I haven't tried the trunk.
--
Vincent Lefèvre <[EMAIL PROTECTED]> - Web: <http://www.vinc17.org/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.org/blog/>
Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)
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