Mark Dickinson wrote: > On Mon, Jun 28, 2010 at 3:04 PM, M.-A. Lemburg <m...@egenix.com> wrote: >> Why do you think that the default -O2 is unwanted > > Because it can cause debug builds of Python to be built with > optimization enabled, as we've already seen at least twice.
Then let me put it this way: How many Python users will compile Python in debug mode ? The point is that the default build of Python should use the correct production settings for the C compiler out of the box and that's what AC_PROG_CC is all about. I'm pretty sure that Python developers who want to use a debug build have enough code foo to get the -O2 turned into a -O0 either by adjust OPT and/or by providing their own CFLAGS env var. Also note that in some cases you may actually want to have a debug build with optimizations turned on, e.g. to track down a compiler optimization bug. >> and how do you know >> whether the compiler accepts -g as option ? > > I don't. It could easily be tested for, though. Alternatively, > setting an empty CFLAGS to '-g' could be done just for gcc, since this > is the only compiler for which AC_PROG_CC adds -O2. ... and then end up with default Python builds which don't have debug symbols available to track down core dumps, etc. ? AC_PROG_CC checks whether the compiler supports -g and always uses it in that case. The option is supported by more compilers than just GCC. E.g. IBM's xlC and Intel's icl compilers support that option as well. -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Source (#1, Jun 28 2010) >>> Python/Zope Consulting and Support ... http://www.egenix.com/ >>> mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ ________________________________________________________________________ 2010-07-19: EuroPython 2010, Birmingham, UK 20 days to go ::: Try our new mxODBC.Connect Python Database Interface for free ! :::: eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 http://www.egenix.com/company/contact/ _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
