So far, mimalloc does not override the `nothrow` variants of the
`delete` operator because it assumes that their implementation in the
C++ standard library redirects to the default `delete` operators. This
is not the case for GNU libstdc++ < 9, where `std::free()` is called
directly.
This issue might be the cause for the crashes reported in #261.
Upstream bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68210
This commit ensures that the `nothrow` `delete` operators are properly
overridden by mimalloc.
CPython and Windows CRT debug builds use different values for uninit,
freed, and padding bytes. Make ``MI_DEBUG_*`` constants conditional to
allow embedders to override the constants.
Windows dbgheap:
```
_bNoMansLandFill = 0xFD
_bDeadLandFill = 0xDD
_bCleanLandFill = 0xCD
```
Python memory debug
```
PYMEM_CLEANBYTE 0xCD
PYMEM_DEADBYTE 0xDD
PYMEM_FORBIDDENBYTE 0xFD
```
Signed-off-by: Christian Heimes <christian@python.org>
Daan
Daan Leijen
Christoph Erhardt
David Carlier
Michael Clark
Christian Heimes
Frank Richter