cffi: typedef shmem_{ctx|team}_t as an opaque struct type

[dalcinl]

This allows for OpenSHMEM implementations declaring ctx/team types as either a pointer types or an integral types.

Declaring shmem_{ctx|team}_t as an opaque struct type has an annoying side-effect: now ctx/team handles can no longer be compared for equality. Therefore, add a couple auxiliary functions eq_{ctx|team} to compare handles for equality. Additionally, in case we need them in the future, add functions to convert to/from integer values.

[dalcinl]

@jeffhammond I managed to find a way to address our Cray issue, albeit at the expense of slightly uglier implementation code in the Python side.

[jeffhammond]

This is what worked on LUMI:

diff --git a/src/apicodegen.py b/src/apicodegen.py
index e6acec0..d0ece31 100644
--- a/src/apicodegen.py
+++ b/src/apicodegen.py
@@ -23,8 +23,8 @@ typename_to_type = {
     'float':      'float',
     'double':     'double',
     'longdouble': 'long double',
-    'complexf':   'float _Complex',
-    'complexd':   'double _Complex',
+    #'complexf':   'float _Complex',
+    #'complexd':   'double _Complex',
 }

 typesizes_rma = (
@@ -122,8 +122,8 @@ typenames_reduce = {
     'float':      "           max min sum prod".split(),
     'double':     "           max min sum prod".split(),
     'longdouble': "           max min sum prod".split(),
-    'complexd':   "                   sum prod".split(),
-    'complexf':   "                   sum prod".split(),
+    #'complexd':   "                   sum prod".split(),
+    #'complexf':   "                   sum prod".split(),
 }


@@ -213,7 +213,7 @@ int shmem_alltoallsmem(shmem_team_t team, void *dest, const void *source, ptrdif

 reduce_ops = ('and', 'or', 'xor', 'max', 'min', 'sum', 'prod')
 reduce_team = """
-int shmem_{TYPENAME}_{OP}_reduce(shmem_team_t team, {TYPE} *dest, const {TYPE} *source, size_t nreduce);
+void shmem_{TYPENAME}_{OP}_reduce(shmem_team_t team, {TYPE} *dest, const {TYPE} *source, size_t nreduce);
 """  # noqa

 wait = """
diff --git a/src/libshmem/config/cray.h b/src/libshmem/config/cray.h
index db66c31..01ed740 100644
--- a/src/libshmem/config/cray.h
+++ b/src/libshmem/config/cray.h
@@ -1,4 +1,27 @@
 #ifndef PySHMEM_CONFIG_CRAY_H
 #define PySHMEM_CONFIG_CRAY_H

+#if CRAY_SHMEM_MAJOR_VERSION >= 11
+#define PySHMEM_HAVE_shmem_malloc_with_hints 1
+#define PySHMEM_HAVE_shmem_team_t 1
+#define PySHMEM_HAVE_SHMEM_CTX_INVALID 1
+#define PySHMEM_HAVE_shmem_amo_nbi 1
+#define PySHMEM_HAVE_shmem_put_signal 1
+#define PySHMEM_HAVE_shmem_signal_fetch 1
+#define PySHMEM_HAVE_shmem_signal_wait_until 1
+#define PySHMEM_HAVE_shmem_broadcast 1
+#define PySHMEM_HAVE_shmem_collect 1
+#define PySHMEM_HAVE_shmem_fcollect 1
+#define PySHMEM_HAVE_shmem_alltoall 1
+#define PySHMEM_HAVE_shmem_alltoalls 1
+#define PySHMEM_HAVE_shmem_broadcastmem 1
+#define PySHMEM_HAVE_shmem_collectmem 1
+#define PySHMEM_HAVE_shmem_fcollectmem 1
+#define PySHMEM_HAVE_shmem_alltoallmem 1
+#define PySHMEM_HAVE_shmem_alltoallsmem 1
+#define PySHMEM_HAVE_shmem_reduce 1
+#define PySHMEM_HAVE_shmem_wait_test_many 1
+//#define PySHMEM_HAVE_shmem_pcontrol 1
+#endif
+
 #endif
diff --git a/src/libshmem/fallback.h b/src/libshmem/fallback.h
index 808fd74..f291abd 100644
--- a/src/libshmem/fallback.h
+++ b/src/libshmem/fallback.h
@@ -658,8 +658,8 @@ PySHMEM_REDUCE_2(longlong,   long long)
 PySHMEM_REDUCE_2(float,      float)
 PySHMEM_REDUCE_2(double,     double)
 PySHMEM_REDUCE_2(longdouble, long double)
-PySHMEM_REDUCE_1(complexf,   float _Complex)
-PySHMEM_REDUCE_1(complexd,   double _Complex)
+//PySHMEM_REDUCE_1(complexf,   float _Complex)
+//PySHMEM_REDUCE_1(complexd,   double _Complex)

 #define PySHMEM_REDUCE_UINT_OP(TYPENAME, TYPE, OP)                      \
 static                                                                  \
diff --git a/src/shmem4py/shmem.py b/src/shmem4py/shmem.py
index 67087c9..756d058 100644
--- a/src/shmem4py/shmem.py
+++ b/src/shmem4py/shmem.py
@@ -2263,7 +2263,7 @@ def reduce(
     team_ = team.ob_team if team is not None else lib.SHMEM_TEAM_WORLD
     ctype, target, source, size = _parse_reduce(target, source, size)
     shmem_reduce = _shmem(None, ctype, f'{op}_reduce')
-    ierr = shmem_reduce(team_, target, source, size)
+    ierr = shmem_reduce(team_, target, source, size) or 0
     _chkerr(ierr, f"shmem_{ctype}_{op}_reduce")

[jeffhammond]

the complex stuff is a hack. i haven't tried to fix it.