[PATCH 39/59] elf: Suppress unused function clang warning for __ifunc_resolver

[Adhemerval Zanella]

The __ifunc_resolver macro expands to:

   extern __typeof (__redirect_name) name __attribute__ ((ifunc ("iname_ifunc")));
   static __typeof (__redirect_name) *name_ifunc (void) { [...] };

And although NAME_IFUNC is and alias for NAME, clang still emits
an 'unused function 'name_ifunc' [-Werror,-Wunused-function]'
warning.  The static is used to avoid name pollution on static
linkage.
---
 include/libc-symbols.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/libc-symbols.h b/include/libc-symbols.h
index b407fa8f7d..2f9453e0d7 100644
--- a/include/libc-symbols.h
+++ b/include/libc-symbols.h
@@ -86,6 +86,7 @@
 
 /* Obtain the definition of symbol_version_reference.  */
 #include <libc-symver.h>
+#include <libc-diag.h>
 
 /* When PIC is defined and SHARED isn't defined, we are building PIE
    by default.  */
@@ -671,7 +672,10 @@ for linking")
 # define __ifunc_args(type_name, name, expr, init, ...)			\
   extern __typeof (type_name) name __attribute__			\
 			      ((ifunc (#name "_ifunc")));		\
-  __ifunc_resolver (type_name, name, expr, init, static, __VA_ARGS__)
+  DIAG_PUSH_NEEDS_COMMENT_CLANG;					\
+  DIAG_IGNORE_NEEDS_COMMENT_CLANG (13, "-Wunused-function");		\
+  __ifunc_resolver (type_name, name, expr, init, static, __VA_ARGS__);	\
+  DIAG_POP_NEEDS_COMMENT_CLANG;
 
 # define __ifunc_args_hidden(type_name, name, expr, init, ...)		\
   __ifunc_args (type_name, name, expr, init, __VA_ARGS__)
-- 
2.43.0