diff options
Diffstat (limited to 'include/libc-symbols.h')
| -rw-r--r-- | include/libc-symbols.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/libc-symbols.h b/include/libc-symbols.h index 4548e097dc..8245885c9f 100644 --- a/include/libc-symbols.h +++ b/include/libc-symbols.h @@ -121,6 +121,21 @@ # define weak_extern(symbol) _weak_extern (weak symbol) # define _weak_extern(expr) _Pragma (#expr) +/* In shared builds, the expression call_function_static_weak + (FUNCTION-SYMBOL, ARGUMENTS) invokes FUNCTION-SYMBOL (an + identifier) unconditionally, with the (potentially empty) argument + list ARGUMENTS. In static builds, if FUNCTION-SYMBOL has a + definition, the function is invoked as before; if FUNCTION-SYMBOL + is NULL, no call is performed. */ +# ifdef SHARED +# define call_function_static_weak(func, ...) func (__VA_ARGS__) +# else /* !SHARED */ +# define call_function_static_weak(func, ...) \ + ({ \ + extern __typeof__ (func) func weak_function; \ + (func != NULL ? func (__VA_ARGS__) : (void)0); \ + }) +# endif #else /* __ASSEMBLER__ */ |