Fixed a couple more C99 comments and one occurence of inline.

Modules/_ctypes/libffi/src/x86/ffi.c

@@ -388,10 +388,10 @@ ffi_prep_raw_closure_loc (ffi_raw_closure* closure,
     return FFI_BAD_ABI;
   }
 
-  // we currently don't support certain kinds of arguments for raw
+  /* we currently don't support certain kinds of arguments for raw
   // closures.  This should be implemented by a separate assembly language
   // routine, since it would require argument processing, something we
-  // don't do now for performance.
+  // don't do now for performance. */
 
   for (i = cif->nargs-1; i >= 0; i--)
     {

Modules/signalmodule.c

@@ -107,7 +107,7 @@ timeval_from_double(double d, struct timeval *tv)
     tv->tv_usec = fmod(d, 1.0) * 1000000.0;
 }
 
-static inline double
+Py_LOCAL_INLINE(double)
 double_from_timeval(struct timeval *tv)
 {
     return tv->tv_sec + (double)(tv->tv_usec / 1000000.0);

Modules/tkappinit.c

@@ -71,7 +71,7 @@ Tcl_AppInit(Tcl_Interp *interp)
 #endif
 
 #ifdef WITH_XXX
-		// Initialize modules that don't require Tk
+		/* Initialize modules that don't require Tk */
 #endif
 
 	_tkinter_skip_tk_init =	Tcl_GetVar(interp, "_tkinter_skip_tk_init", TCL_GLOBAL_ONLY);

Objects/unicodeobject.c

@@ -115,19 +115,19 @@ static char unicode_default_encoding[100];
 /* Fast detection of the most frequent whitespace characters */
 const unsigned char _Py_ascii_whitespace[] = {
 	0, 0, 0, 0, 0, 0, 0, 0,
-//     case 0x0009: /* HORIZONTAL TABULATION */
-//     case 0x000A: /* LINE FEED */
-//     case 0x000B: /* VERTICAL TABULATION */
-//     case 0x000C: /* FORM FEED */
-//     case 0x000D: /* CARRIAGE RETURN */
+/*     case 0x0009: * HORIZONTAL TABULATION */
+/*     case 0x000A: * LINE FEED */
+/*     case 0x000B: * VERTICAL TABULATION */
+/*     case 0x000C: * FORM FEED */
+/*     case 0x000D: * CARRIAGE RETURN */
 	0, 1, 1, 1, 1, 1, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
-//     case 0x001C: /* FILE SEPARATOR */
-//     case 0x001D: /* GROUP SEPARATOR */
-//     case 0x001E: /* RECORD SEPARATOR */
-//     case 0x001F: /* UNIT SEPARATOR */
+/*     case 0x001C: * FILE SEPARATOR */
+/*     case 0x001D: * GROUP SEPARATOR */
+/*     case 0x001E: * RECORD SEPARATOR */
+/*     case 0x001F: * UNIT SEPARATOR */
 	0, 0, 0, 0, 1, 1, 1, 1,
-//     case 0x0020: /* SPACE */
+/*     case 0x0020: * SPACE */
 	1, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
@@ -146,13 +146,13 @@ const unsigned char _Py_ascii_whitespace[] = {
 /* Same for linebreaks */
 static unsigned char ascii_linebreak[] = {
 	0, 0, 0, 0, 0, 0, 0, 0,
-//         0x000A, /* LINE FEED */
-//         0x000D, /* CARRIAGE RETURN */
+/*         0x000A, * LINE FEED */
+/*         0x000D, * CARRIAGE RETURN */
 	0, 0, 1, 0, 0, 1, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
-//         0x001C, /* FILE SEPARATOR */
-//         0x001D, /* GROUP SEPARATOR */
-//         0x001E, /* RECORD SEPARATOR */
+/*         0x001C, * FILE SEPARATOR */
+/*         0x001D, * GROUP SEPARATOR */
+/*         0x001E, * RECORD SEPARATOR */
 	0, 0, 0, 0, 1, 1, 1, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0,

Python/_warnings.c

@@ -377,7 +377,7 @@ warn_explicit(PyObject *category, PyObject *message,
         }
     }
 
-    if (rc == 1)  // Already warned for this module. */
+    if (rc == 1)  /* Already warned for this module. */
         goto return_none;
     if (rc == 0) {
         PyObject *show_fxn = get_warnings_attr("showwarning");
@@ -800,8 +800,8 @@ static PyMethodDef warnings_functions[] = {
         warn_doc},
     {"warn_explicit", (PyCFunction)warnings_warn_explicit,
         METH_VARARGS | METH_KEYWORDS, warn_explicit_doc},
-    // XXX(brett.cannon): add showwarning?
-    // XXX(brett.cannon): Reasonable to add formatwarning?
+    /* XXX(brett.cannon): add showwarning? */
+    /* XXX(brett.cannon): Reasonable to add formatwarning? */
     {NULL, NULL}	        /* sentinel */
 };