silence some clang warnings

principally, proto.h was sometimes being included twice - once before
a fn decl, and once after - giving rise to a 'decl after def' warning.

Also, S_croak_memory_wrap was declared static in every source file, but
not used in some. So selectively disable the unused-function warning.

1 files changed, 3 insertions, 0 deletions

diff --git a/inline.h b/inline.h
index 776a30499e..072d1b203d 100644
--- a/inline.h
+++ b/inline.h
@@ -126,8 +126,11 @@ S_sv_or_pv_pos_u2b(pTHX_ SV *sv, const char *pv, STRLEN pos, STRLEN *lenp)
 /* ------------------------------- handy.h ------------------------------- */
 
 /* saves machine code for a common noreturn idiom typically used in Newx*() */
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
 static void
 S_croak_memory_wrap(void)
 {
     Perl_croak_nocontext("%s",PL_memory_wrap);
 }
+#pragma clang diagnostic pop