Building on MinGW

mkleehammer/pyodbc/mkleehammer#1168

setup.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-import sys, os, shlex, re
+import sys, os, re, shlex, sysconfig
 from os.path import exists, join, isdir, relpath, expanduser
 from pathlib import Path
 from inspect import cleandoc
@@ -83,7 +83,15 @@ def get_compiler_settings():
         'define_macros': [('PYODBC_VERSION', VERSION)]
     }
 
-    if os.name == 'nt':
+    if 'mingw' in sysconfig.get_platform():
+        # Windows mingw (note that os.name == 'nt' is True)
+        settings['extra_compile_args'].extend([
+            '-Wno-write-strings',
+            '-Wno-deprecated-declarations',
+        ])
+        settings['libraries'].append('odbc32')
+
+    elif os.name == 'nt':
         settings['extra_compile_args'].extend([
             '/Wall',
             '/wd4514',     # unreference inline function removed

src/connection.cpp

@@ -111,11 +111,11 @@ static bool ApplyPreconnAttrs(HDBC hdbc, SQLINTEGER ikey, PyObject *value, char
     {
         if (_PyLong_Sign(value) >= 0)
         {
-            ivalue = (SQLPOINTER)PyLong_AsUnsignedLong(value);
+            ivalue = (SQLPOINTER)(uintptr_t)PyLong_AsUnsignedLong(value);
             vallen = SQL_IS_UINTEGER;
         } else
         {
-            ivalue = (SQLPOINTER)PyLong_AsLong(value);
+            ivalue = (SQLPOINTER)(uintptr_t)PyLong_AsLong(value);
             vallen = SQL_IS_INTEGER;
         }
     }

src/pyodbc.h

@@ -28,8 +28,14 @@ typedef long long INT64;
 typedef unsigned long long UINT64;
 #define _strcmpi strcasecmp
 #define _strdup strdup
+#ifdef __MINGW32__
+  #include <windef.h>
+  #include <malloc.h>
+  #include <windows.h>
+#else
   inline int max(int lhs, int rhs) { return (rhs > lhs) ? rhs : lhs; }
 #endif
+#endif
 
 #ifdef __SUN__
 #include <alloca.h>
@@ -109,6 +115,11 @@ inline void _strlwr(char* name)
 #define CDECL
 #endif
 
+#ifdef __MINGW32__
+#define min(X,Y) ((X) < (Y) ? (X) : (Y))
+#define max(X,Y) ((X) > (Y) ? (X) : (Y))
+#endif
+
 #define STRINGIFY(x) #x
 #define TOSTRING(x) STRINGIFY(x)
 

src/pyodbcmodule.cpp

@@ -303,6 +303,7 @@ static bool AllocateEnv()
     }
 
     SQLPOINTER defaultVersion = (SQLPOINTER)SQL_OV_ODBC3;
+    #ifdef SQL_OV_ODBC3_80
     PyObject* odbcversion = PyObject_GetAttrString(pModule, "odbcversion");
     if (PyObject_TypeCheck(odbcversion, &PyUnicode_Type)) {
         if (PyUnicode_CompareWithASCIIString(odbcversion, "3.8") == 0)
@@ -311,7 +312,7 @@ static bool AllocateEnv()
         }
     }
     Py_DECREF(odbcversion);
-
+    #endif
     if (!SQL_SUCCEEDED(SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, defaultVersion, sizeof(int))))
     {
         PyErr_SetString(PyExc_RuntimeError, "Unable to set SQL_ATTR_ODBC_VERSION attribute.");