I've tried again and these are the compile errors:

$ pypy3 setup.py build_ext --inplace --force
running build_ext
SQLite: Using amalgamation /space/apsw/sqlite3/sqlite3.c
SQLite: Using configure generated /space/apsw/sqlite3/sqlite3config.h
building 'apsw' extension
creating build/temp.linux-x86_64-3.7
creating build/temp.linux-x86_64-3.7/src
gcc -pthread -DNDEBUG -O2 -fPIC -DNDEBUG=1 -DAPSW_FORK_CHECKER=1 -DAPSW_USE_SQLITE_AMALGAMATION=1 -DAPSW_USE_SQLITE_CONFIG=1 -I/space/apsw/sqlite3 -Isrc -I/usr/lib/pypy3/include -c src/apsw.c -o build/temp.linux-x86_64-3.7/src/apsw.o
In file included from src/apsw.c:79:
/usr/lib/pypy3/include/Python.h:6: warning: "_GNU_SOURCE" redefined
    6 | #define _GNU_SOURCE 1
      | 
In file included from src/apsw.c:49:
/space/apsw/sqlite3/sqlite3.c:242: note: this is the location of the previous definition
  242 | # define _GNU_SOURCE
      | 
In file included from src/apsw.c:136:
src/util.c: In function ‘apsw_write_unraiseable’:
src/util.c:116:30: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘frame’
  116 |   frame = PyThreadState_GET()->frame;
      |                              ^~
src/util.c:120:18: error: ‘PyFrameObject’ {aka ‘struct _frame’} has no member named ‘f_back’
  120 |     frame = frame->f_back;
      |                  ^~
In file included from src/apsw.c:139:
src/statementcache.c: In function ‘statementcache_prepare_internal’:
src/statementcache.c:139:12: warning: implicit declaration of function ‘_Py_HashBytes’ [-Wimplicit-function-declaration]
  139 |     hash = _Py_HashBytes(utf8, utf8size);
      |            ^~~~~~~~~~~~~
src/apsw.c: In function ‘formatsqlvalue’:
src/apsw.c:1155:7: warning: implicit declaration of function ‘PyUnicode_CopyCharacters’ [-Wimplicit-function-declaration]
 1155 |       PyUnicode_CopyCharacters(strres, 1, value, 0, input_length);
      |       ^~~~~~~~~~~~~~~~~~~~~~~~
error: command 'gcc' failed with exit status 1

The first two in apsw_write_unraiseable are only involved in writing unraisable exceptions, and that section could just be omitted in pypy.

_Py_HashBytes isn't officially documented in CPython, but is the underlying function used for hashing strings and bytes. This is only used in the statement cache for APSW, and anything would work, even return 0 (worst case). PyUnicode_CopyCharacters is a strange one to be missing, but can be replaced with a loop of PyUnicode_ReadChar/PyUnicode_WriteChar.

So it wouldn't take that much to get this to compile. Do note that APSW depends on the GIL and does not separately protect its data structures. However I doubt there would be any performance differences.

install apsw with pypy3 #323

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