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system: Add WARN_UNUSED_RESULT

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I'd like to have the option of marking functions with
__attribute__ ((__warn_unused_result__)), so this patch adds a macro.
And use it for maybe_wrap_with_location, it's always a bug if the
return value is not used, which happened to me and got me confused.

gcc/ChangeLog:

	* system.h (WARN_UNUSED_RESULT): Define for GCC >= 3.4.
	* tree.h (maybe_wrap_with_location): Add WARN_UNUSED_RESULT.
This commit is contained in:
Marek Polacek 2020-11-11 20:18:06 -05:00
parent f8f575d759
commit 876b45db81
2 changed files with 7 additions and 1 deletions
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6
gcc/system.h
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@ -789,6 +789,12 @@ extern void fancy_abort (const char *, int, const char *)
#define ALWAYS_INLINE inline
#endif
#if GCC_VERSION >= 3004
#define WARN_UNUSED_RESULT __attribute__ ((__warn_unused_result__))
#else
#define WARN_UNUSED_RESULT
#endif
/* Use gcc_unreachable() to mark unreachable locations (like an
unreachable default case of a switch. Do not use gcc_assert(0). */
#if (GCC_VERSION >= 4005) && !ENABLE_ASSERT_CHECKING

2
gcc/tree.h
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@ -1214,7 +1214,7 @@ get_expr_source_range (tree expr)
extern void protected_set_expr_location (tree, location_t);
extern void protected_set_expr_location_if_unset (tree, location_t);
extern tree maybe_wrap_with_location (tree, location_t);
WARN_UNUSED_RESULT extern tree maybe_wrap_with_location (tree, location_t);
extern int suppress_location_wrappers;