Possible fix for ppc64le platform (#51)

* Possible fix for ppc64le platform

Author: eriknw

suitesparse_graphblas/__init__.py

@@ -7,11 +7,12 @@
 import platform
 
 _is_osx_arm64 = platform.machine() == "arm64"
+_is_ppc64le = platform.machine() == "ppc64le"
 _c_float = ffi.typeof("float")
 _c_double = ffi.typeof("double")
 
 
-if _is_osx_arm64:
+if _is_osx_arm64 or _is_ppc64le:
 
     def vararg(val):
         # Interpret float as int32 and double as int64
@@ -25,6 +26,8 @@ def vararg(val):
             val = ffi.cast("int64_t", val)
         # Cast variadic argument as char * to force it onto the stack where ARM64 expects it
         # https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms
+        #
+        # The same fix *may* work for ppc64le
         return ffi.cast("char *", val)
 
 else:

suitesparse_graphblas/build.py

@@ -6,6 +6,7 @@
 
 is_win = sys.platform.startswith("win")
 is_arm64 = platform.machine() == "arm64"
+is_ppc64le = platform.machine() == "ppc64le"  # Use same header as arm64, which *may* work
 thisdir = os.path.dirname(__file__)
 
 ffibuilder = FFI()
@@ -30,7 +31,7 @@
 header = "suitesparse_graphblas.h"
 if is_win:
     header = "suitesparse_graphblas_no_complex.h"
-if is_arm64:
+if is_arm64 or is_ppc64le:
     header = "suitesparse_graphblas_arm64.h"
 gb_cdef = open(os.path.join(thisdir, header))