On 25/09/2019 17:16, Stephan Bergmann wrote:
~ 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.
So Clang gives it away:
test.c:2:1: warning: const [-W#pragma-messages]
G_CONST_RETURN char * f();
^
/usr/include/glib-2.0/glib/gmacros.h:913:30: note: expanded from macro
'G_CONST_RETURN'
#define G_CONST_RETURN const GLIB_DEPRECATED_MACRO_IN_2_30_FOR(const)
^
/usr/include/glib-2.0/glib/gversionmacros.h:387:49: note: expanded from macro
'GLIB_DEPRECATED_MACRO_IN_2_30_FOR'
# define GLIB_DEPRECATED_MACRO_IN_2_30_FOR(f) GLIB_DEPRECATED_MACRO_FOR(f)
^
/usr/include/glib-2.0/glib/gmacros.h:990:38: note: expanded from macro
'GLIB_DEPRECATED_MACRO_FOR'
#define GLIB_DEPRECATED_MACRO_FOR(f) _GLIB_GNUC_DO_PRAGMA(GCC warning #f)
^
/usr/include/glib-2.0/glib/gmacros.h:988:33: note: expanded from macro
'_GLIB_GNUC_DO_PRAGMA'
#define _GLIB_GNUC_DO_PRAGMA(x) _Pragma(G_STRINGIFY (x))
^
<scratch space>:110:6: note: expanded from here
GCC warning "const"
^
1 warning generated.
(At least partly; /usr/include/glib-2.0/glib/gmacros.h has only 540
lines, there's no line 913; so whatever #line tricks get played there...)
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