Build extension suffix from SOABI_PLATFORM

Author: stefanor

Makefile.pre.in

@@ -1958,7 +1958,6 @@ Python/interpconfig.o: $(srcdir)/Python/interpconfig.c $(srcdir)/Python/config_c
 Python/dynload_shlib.o: $(srcdir)/Python/dynload_shlib.c Makefile
 	$(CC) -c $(PY_CORE_CFLAGS) \
 		-DSOABI='"$(SOABI)"' \
-		$(MULTIARCH_CPPFLAGS) \
 		-o $@ $(srcdir)/Python/dynload_shlib.c
 
 Python/dynload_hpux.o: $(srcdir)/Python/dynload_hpux.c Makefile

Python/dynload_shlib.c

@@ -45,8 +45,8 @@ const char *_PyImport_DynLoadFiletab[] = {
     "." ALT_SOABI ".so",
 #endif
     ".abi" PYTHON_ABI_STRING ".so",
-#ifdef MULTIARCH
-    ".abi" PYTHON_ABI_STRING "-" MULTIARCH ".so",
+#ifdef SOABI_PLATFORM
+    ".abi" PYTHON_ABI_STRING "-" SOABI_PLATFORM ".so",
 #endif
     ".so",
 #endif  /* __CYGWIN__ */

configure

@@ -1197,6 +1197,8 @@ AS_CASE([$ac_sys_system],
   [SOABI_PLATFORM=$PLATFORM_TRIPLET]
 )
 
+AC_DEFINE_UNQUOTED([SOABI_PLATFORM], ["${SOABI_PLATFORM}"], [Platform tag, used in binary module extension filenames.])
+
 if test x$MULTIARCH != x; then
   MULTIARCH_CPPFLAGS="-DMULTIARCH=\\\"$MULTIARCH\\\""
 fi

configure.ac

@@ -1818,6 +1818,9 @@
 /* The size of '_Bool', as computed by sizeof. */
 #undef SIZEOF__BOOL
 
+/* Platform tag, used in binary module extension filenames. */
+#undef SOABI_PLATFORM
+
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS