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From: Fangrui Song <maskray@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/google/grte/v5-2.27/master] Skip undefined va_arg_pack
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1f3a3e1742c91746216708e95814b9aa0b9b4b45

commit 1f3a3e1742c91746216708e95814b9aa0b9b4b45
Author: Stan Shebs <stanshebs@google.com>
Date:   Fri Jan 19 09:31:04 2018 -0800

    Skip undefined va_arg_pack

Diff:
---
 sysdeps/generic/ldsodefs.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 0ea27865c0..a9c2b0835a 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -710,7 +710,11 @@ _dl_dprintf (int fd, const char *fmt, ...)
 {
   /* Use local declaration to avoid includign <stdio.h>.  */
   extern int __dprintf(int fd, const char *format, ...) attribute_hidden;
+#if defined(__clang__)
+  __dprintf (fd, fmt);
+#else
   __dprintf (fd, fmt, __builtin_va_arg_pack ());
+#endif
 }
 #endif