After switching to F31 beta I came across a GCC warning that looks like
it is useful, trying to warn about misguided uses of the G_CONST_RETURN
macro from glib-2.0. However, it leaves me puzzled:
$ cat test.c
#include "glib.h"
G_CONST_RETURN char * f();
On F30:
~ gcc --version
gcc (GCC) 9.2.1 20190827 (Red Hat 9.2.1-1)
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
~ gcc $(pkg-config -cflags glib-2.0) -c test.c
works fine. On F31 beta,
~ gcc --version
gcc (GCC) 9.2.1 20190827 (Red Hat 9.2.1-1)
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
~ gcc $(pkg-config -cflags glib-2.0) -c test.c
test.c:2:13: warning: const
2 | G_CONST_RETURN char * f();
| ^~~~~~~
emits a cryptic warning (and gets the positioning of the squiggly
underline wrong).
On both F30 and F31, /usr/include/glib-2.0/glib/gmacros.h contains
/* Deprecated -- do not use. */
#ifndef G_DISABLE_DEPRECATED
#ifdef G_DISABLE_CONST_RETURNS
#define G_CONST_RETURN
#else
#define G_CONST_RETURN const
#endif
#endif
so I'm not sure what causes the warning to be emitted on F31 but not on F30.
(<https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#G-CONST-RETURN:CAPS>
states: "The macro can be used in place of const for functions that
return a value that should not be modified." So the intent of the
warning appears to be to warn about uses of G_CONST_RETURN that don't
make the return type const, but rather make the return type be e.g.
pointer-to-const as in my example.)
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