Explicitly define cmp_pandas_datetimestruct (#17750)

Author: jbrockmendel

pandas/_libs/src/datetime/np_datetime.c

@@ -269,8 +269,8 @@ static void set_datetimestruct_days(npy_int64 days,
 /*
  * Compares two pandas_datetimestruct objects chronologically
  */
-int cmp_pandas_datetimestruct(pandas_datetimestruct *a,
- pandas_datetimestruct *b) {
+int cmp_pandas_datetimestruct(const pandas_datetimestruct *a,
+ const pandas_datetimestruct *b) {
  if (a->year > b->year) {
  return 1;
  } else if (a->year < b->year) {

pandas/_libs/src/datetime/np_datetime.h

@@ -99,6 +99,14 @@ convert_datetimestruct_to_datetime(pandas_datetime_metadata *meta,
 npy_int64
 get_datetimestruct_days(const pandas_datetimestruct *dts);
 
+
+/*
+ * Compares two pandas_datetimestruct objects chronologically
+ */
+int cmp_pandas_datetimestruct(const pandas_datetimestruct *a,
+ const pandas_datetimestruct *b);
+
+
 /*
  * Adjusts a datetimestruct based on a minutes offset. Assumes
  * the current values are valid.

setup.py

@@ -511,7 +511,7 @@ def pxd(name):
  'pxdfiles': ['_libs/src/util', '_libs/hashtable'],
  'depends': _pxi_dep['join']},
  '_libs.reshape': {'pyxfile': '_libs/reshape',
- 'depends': _pxi_dep['reshape'], 'include': []},
+ 'depends': _pxi_dep['reshape']},
  '_libs.interval': {'pyxfile': '_libs/interval',
  'pxdfiles': ['_libs/hashtable'],
  'depends': _pxi_dep['interval']},
@@ -527,7 +527,7 @@ def pxd(name):
  'pandas/_libs/src/parser/io.c']},
  '_libs.sparse': {'pyxfile': '_libs/sparse',
  'depends': (['pandas/_libs/sparse.pyx'] +
- _pxi_dep['sparse']), 'include': []},
+ _pxi_dep['sparse'])},
  '_libs.testing': {'pyxfile': '_libs/testing',
  'depends': ['pandas/_libs/testing.pyx']},
  '_libs.hashing': {'pyxfile': '_libs/hashing',