closes bpo-39605: Fix some casts to not cast away const. (GH-18453)

gcc -Wcast-qual turns up a number of instances of casting away constness of pointers. Some of these can be safely modified, by either:

Adding the const to the type cast, as in:

-    return _PyUnicode_FromUCS1((unsigned char*)s, size);
+    return _PyUnicode_FromUCS1((const unsigned char*)s, size);

or, Removing the cast entirely, because it's not necessary (but probably was at one time), as in:

-    PyDTrace_FUNCTION_ENTRY((char *)filename, (char *)funcname, lineno);
+    PyDTrace_FUNCTION_ENTRY(filename, funcname, lineno);

These changes will not change code, but they will make it much easier to check for errors in consts

1 files changed, 3 insertions, 3 deletions

diff --git a/Python/ceval.c b/Python/ceval.c
index eb0f131..426d0bb 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -5440,7 +5440,7 @@ dtrace_function_entry(PyFrameObject *f)
     funcname = PyUnicode_AsUTF8(f->f_code->co_name);
     lineno = PyCode_Addr2Line(f->f_code, f->f_lasti);
 
-    PyDTrace_FUNCTION_ENTRY((char *)filename, (char *)funcname, lineno);
+    PyDTrace_FUNCTION_ENTRY(filename, funcname, lineno);
 }
 
 static void
@@ -5454,7 +5454,7 @@ dtrace_function_return(PyFrameObject *f)
     funcname = PyUnicode_AsUTF8(f->f_code->co_name);
     lineno = PyCode_Addr2Line(f->f_code, f->f_lasti);
 
-    PyDTrace_FUNCTION_RETURN((char *)filename, (char *)funcname, lineno);
+    PyDTrace_FUNCTION_RETURN(filename, funcname, lineno);
 }
 
 /* DTrace equivalent of maybe_call_line_trace. */
@@ -5486,7 +5486,7 @@ maybe_dtrace_line(PyFrameObject *frame,
         co_name = PyUnicode_AsUTF8(frame->f_code->co_name);
         if (!co_name)
             co_name = "?";
-        PyDTrace_LINE((char *)co_filename, (char *)co_name, line);
+        PyDTrace_LINE(co_filename, co_name, line);
     }
     *instr_prev = frame->f_lasti;
 }