bpo-40521: Make bytes singletons per interpreter (GH-21074)
Each interpreter now has its own empty bytes string and single byte
character singletons.
Replace STRINGLIB_EMPTY macro with STRINGLIB_GET_EMPTY() macro.
diff --git a/Objects/stringlib/stringdefs.h b/Objects/stringlib/stringdefs.h
index ce27f3e..c12ecc5 100644
--- a/Objects/stringlib/stringdefs.h
+++ b/Objects/stringlib/stringdefs.h
@@ -1,6 +1,10 @@
#ifndef STRINGLIB_STRINGDEFS_H
#define STRINGLIB_STRINGDEFS_H
+#ifndef STRINGLIB_GET_EMPTY
+# error "STRINGLIB_GET_EMPTY macro must be defined"
+#endif
+
/* this is sort of a hack. there's at least one place (formatting
floats) where some stringlib code takes a different path if it's
compiled as unicode. */
@@ -13,7 +17,6 @@
#define STRINGLIB_CHAR char
#define STRINGLIB_TYPE_NAME "string"
#define STRINGLIB_PARSE_CODE "S"
-#define STRINGLIB_EMPTY nullstring
#define STRINGLIB_ISSPACE Py_ISSPACE
#define STRINGLIB_ISLINEBREAK(x) ((x == '\n') || (x == '\r'))
#define STRINGLIB_ISDECIMAL(x) ((x >= '0') && (x <= '9'))