I'm confused. I've always assumed that --with-pydebug was intended for the situation where you're modifying the C code, so obviously you might have to debug C code. (I know that was the case when we introduced it, decades ago.) If that's not the goal, then what is --py-debug used for?
On Mon, May 24, 2021 at 3:35 AM Victor Stinner <vstin...@python.org> wrote: > "Debugging" means many things. Python is built with -Og because it > makes Python faster than -O0, and most developers debug Python code, > not C code (in gdb). > > If you don't need to go up to the gdb/lldb level, -Og is fine. > > It would even make sense to build Python with -O3 in debug mode if you > don't debug C code at all, only pure Python code. > > My proposition to switch to -00 by default was rejected: > https://bugs.python.org/issue38350 > > I also love -O0 when I modify C code because it makes the build faster ;-) > > Fedora Python debug builds are now built with -O0 which makes gdb a > way more pleasant experience, not more strange behavior with inlined > code or "<optimized out>" local variables or function arguments. > > Victor > > On Sun, May 23, 2021 at 3:57 PM Skip Montanaro <skip.montan...@gmail.com> > wrote: > > > > > I strongly suggest to only build Python with -O0 when using gdb. -Og > > > enables too many optimizations which makes gdb less usable. > > > > Thanks, Victor. It never made sense to me that you would want any > > optimizations enabled when truly debugging code (as opposed to wanting > > debug symbols and a sane traceback in production code). > > > > I'm getting more convinced that the problem I'm seeing is a GCC/GDB > > thing, particularly because I can move the erroneous stopping point by > > changing the GCC optimization level. I'll probably open a bugzilla > > report just so it's on that team's radar screen. In the meantime, to > > get going again I wrote a crude script which maps the > > file:function:label form to file:linenumber form. That way I can > > save/restore breakpoints across GDB sessions and still avoid problems > > when the offsets to specific instructions change. > > > > Skip > > > > Skip > > > > -- > Night gathers, and now my watch begins. It shall not end until my death. > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/FPWJHHV55JPF6ZQVI2OGMYSIPYN3AXH2/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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