add a debug build option to setup.py

[Antoine Martin]

So we can get debug symbols from the cython bits.
And add flag handling so we can enable it with --with-debug.

For win32, this means adding:

/Zi /DEBUG /RTC1 /GS

To the compile phase, and:

/DEBUG

To the linker.

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For linux:

-g -ggdb

is probably enough, see ​Debugging Options(gcc.gnu.org)

[ahuillet]

The following patch does it: (broken link removed by totaam)

but it breaks because when building gdk_atoms, py2exe adds by default /Ox and this is incompatible with the options I have added

[Antoine Martin]

Some pointers:

• ​Cython debugging (cython docs)
• ​Cython debugging techniques (cython wiki)
• ​Debugging Cython Code on Windows X64 (not working here - but interesting nonetheless)

---

• r2951 added "-g" and "pyrex_gdb=True" to the posix builds - to use it, call setup.py with "--with-debug"
• r2952 allows us to build with --pyrex-gdb option on win32 - you must set DEBUG=1 in win32/MAKE-INSTALLER.BAT

---

Can you please try and let me know if that helps in debugging the cython code?

[ahuillet]

The changes do not seem to have any impact, in that the commandlines used for building do not include /DEBUG nor any of the options I mention in the ticket.
Adding those options manually doesn't work, per comment:1

[Antoine Martin]

ahuillet: please see the links in comment:2, we cannot just add /DEBUG for cython code

[ahuillet]

Well, in the end, we need the C files to be compiled with the /DEBUG switch. The changes in r2951 and r2952 don't end up doing that, so the cython code is built without debug symbols.

[ahuillet]

I don't know what to do about this - close if you feel like it. I do believe it can be useful to have debug symbols in the cython-produced libs, but if that's not feasible we have no choice.

[Antoine Martin]

done in r5022 - not sure how useful this is going to be as we rarely ever get any crashes nowadays, but it's there.
Just build with:

./setup.py --with-debug