REF: Add custom proj_create_crs_to_crs to allow options

pyproj/_transformer.pyx

@@ -17,6 +17,7 @@ from pyproj._crs cimport (
 )
 from pyproj._datadir cimport pyproj_context_create, pyproj_context_destroy
 
+from pyproj._datadir import _LOGGER
 from pyproj.aoi import AreaOfInterest
 from pyproj.compat import cstrencode, pystrdecode
 from pyproj.enums import ProjVersion, TransformDirection
@@ -233,6 +234,46 @@ cdef _CRS get_transform_crs(_CRS in_crs):
     return in_crs.source_crs if in_crs.is_bound else in_crs
 
 
+cdef PJ* proj_create_crs_to_crs(
+    PJ_CONTEXT *ctx,
+    const char *source_crs_str,
+    const char *target_crs_str,
+    PJ_AREA *area,
+    const char* const *options,
+):
+    """
+    This is the same as proj_create_crs_to_crs in proj.h
+    with the options added. It is a hack for stabilily
+    reasons.
+
+    Reference: https://github.com/pyproj4/pyproj/pull/800
+    """
+    cdef PJ *source_crs = proj_create(ctx, source_crs_str)
+    if source_crs == NULL:
+        _LOGGER.debug(
+            "PROJ_DEBUG: proj_create_crs_to_crs: Cannot instantiate source_crs"
+        )
+        return NULL
+    cdef PJ *target_crs = proj_create(ctx, target_crs_str)
+    if target_crs == NULL:
+        proj_destroy(source_crs)
+        _LOGGER.debug(
+            "PROJ_DEBUG: proj_create_crs_to_crs: Cannot instantiate target_crs"
+        )
+        return NULL
+
+    cdef PJ* transform = proj_create_crs_to_crs_from_pj(
+        ctx,
+        source_crs,
+        target_crs,
+        area,
+        options,
+    )
+    proj_destroy(source_crs)
+    proj_destroy(target_crs)
+    return transform
+
+
 cdef class _Transformer(Base):
     def __cinit__(self):
         self._area_of_use = None
@@ -371,6 +412,7 @@ cdef class _Transformer(Base):
                 cstrencode(crs_from.srs),
                 cstrencode(crs_to.srs),
                 pj_area_of_interest,
+                NULL,
             )
         finally:
             if pj_area_of_interest != NULL:

pyproj/proj.pxi

@@ -130,7 +130,13 @@ cdef extern from "proj.h":
         double *t, size_t st, size_t nt
     ) nogil
     ctypedef struct PJ_AREA
-    PJ *proj_create_crs_to_crs(PJ_CONTEXT *ctx, const char *source_crs, const char *target_crs, PJ_AREA *area)
+    PJ *proj_create_crs_to_crs_from_pj(
+        PJ_CONTEXT *ctx,
+        PJ *source_crs,
+        PJ *target_crs,
+        PJ_AREA *area,
+        const char* const *options,
+    )
 
     ctypedef enum PJ_COMPARISON_CRITERION:
         PJ_COMP_STRICT