[PATCH v3 12/16] misc/bits/syslog.h: Clearly separate declaration from definition

["Frédéric Bérat" <fberat@redhat.com>]

This allows to include bits/syslog-decl.h in include/sys/syslog.h and
therefore be able to create the libc_hidden_builtin_proto (__syslog_chk)
prototype.
---
 include/bits/syslog-decl.h                    |  1 +
 include/sys/syslog.h                          |  4 +++
 misc/Makefile                                 |  1 +
 misc/bits/syslog-decl.h                       | 35 +++++++++++++++++++
 misc/bits/syslog.h                            | 10 +-----
 misc/syslog.c                                 |  4 ++-
 .../ldbl-128ibm-compat/ieee128-syslog.c       |  1 +
 7 files changed, 46 insertions(+), 10 deletions(-)
 create mode 100644 include/bits/syslog-decl.h
 create mode 100644 misc/bits/syslog-decl.h

diff --git a/include/bits/syslog-decl.h b/include/bits/syslog-decl.h
new file mode 100644
index 0000000000..491a263777
--- /dev/null
+++ b/include/bits/syslog-decl.h
@@ -0,0 +1 @@
+#include <misc/bits/syslog-decl.h>
diff --git a/include/sys/syslog.h b/include/sys/syslog.h
index 44422eab13..1566228860 100644
--- a/include/sys/syslog.h
+++ b/include/sys/syslog.h
@@ -3,6 +3,8 @@
 #include <misc/sys/syslog.h>
 #ifndef _ISOMAC
 
+#include <bits/syslog-decl.h>
+
 libc_hidden_ldbl_proto (syslog)
 
 /* __vsyslog_internal uses the same mode_flags bits as
@@ -12,5 +14,7 @@ extern void __vsyslog_internal (int pri, const char *fmt, __gnuc_va_list ap,
      attribute_hidden
      __attribute__ ((__format__ (__printf__, 2, 0)));
 
+libc_hidden_ldbl_proto (__syslog_chk)
+
 #endif /* _ISOMAC */
 #endif /* syslog.h */
diff --git a/misc/Makefile b/misc/Makefile
index 3497d30f3b..fe0d49c1de 100644
--- a/misc/Makefile
+++ b/misc/Makefile
@@ -64,6 +64,7 @@ headers	:= \
   sys/xattr.h \
   syslog.h \
   sys/syslog.h \
+  bits/syslog-decl.h \
   bits/syslog.h \
   bits/syslog-ldbl.h \
   bits/syslog-path.h \
diff --git a/misc/bits/syslog-decl.h b/misc/bits/syslog-decl.h
new file mode 100644
index 0000000000..a9349feee0
--- /dev/null
+++ b/misc/bits/syslog-decl.h
@@ -0,0 +1,35 @@
+/* Checking routines for syslog functions. Declaration only.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_SYSLOG_DECL_H
+#define _BITS_SYSLOG_DECL_H 1
+
+#ifndef _SYS_SYSLOG_H
+# error "Never include <bits/syslog-decl.h> directly; use <sys/syslog.h> instead."
+#endif
+
+extern void __syslog_chk (int __pri, int __flag, const char *__fmt, ...)
+     __attribute__ ((__format__ (__printf__, 3, 4)));
+
+#ifdef __USE_MISC
+extern void __vsyslog_chk (int __pri, int __flag, const char *__fmt,
+			   __gnuc_va_list __ap)
+     __attribute__ ((__format__ (__printf__, 3, 0)));
+#endif
+
+#endif
diff --git a/misc/bits/syslog.h b/misc/bits/syslog.h
index 305cac4ba0..d7de90ed14 100644
--- a/misc/bits/syslog.h
+++ b/misc/bits/syslog.h
@@ -20,15 +20,7 @@
 # error "Never include <bits/syslog.h> directly; use <sys/syslog.h> instead."
 #endif
 
-
-extern void __syslog_chk (int __pri, int __flag, const char *__fmt, ...)
-     __attribute__ ((__format__ (__printf__, 3, 4)));
-
-#ifdef __USE_MISC
-extern void __vsyslog_chk (int __pri, int __flag, const char *__fmt,
-			   __gnuc_va_list __ap)
-     __attribute__ ((__format__ (__printf__, 3, 0)));
-#endif
+#include <bits/syslog-decl.h>
 
 #include <bits/floatn.h>
 #if defined __LDBL_COMPAT || __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
diff --git a/misc/syslog.c b/misc/syslog.c
index f67d4b58a4..1b8cb722c5 100644
--- a/misc/syslog.c
+++ b/misc/syslog.c
@@ -101,7 +101,7 @@ __vsyslog (int pri, const char *fmt, va_list ap)
 ldbl_weak_alias (__vsyslog, vsyslog)
 
 void
-__syslog_chk (int pri, int flag, const char *fmt, ...)
+___syslog_chk (int pri, int flag, const char *fmt, ...)
 {
   va_list ap;
 
@@ -109,6 +109,8 @@ __syslog_chk (int pri, int flag, const char *fmt, ...)
   __vsyslog_internal (pri, fmt, ap, (flag > 0) ? PRINTF_FORTIFY : 0);
   va_end (ap);
 }
+ldbl_hidden_def (___syslog_chk, __syslog_chk)
+ldbl_strong_alias (___syslog_chk, __syslog_chk)
 
 void
 __vsyslog_chk (int pri, int flag, const char *fmt, va_list ap)
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-syslog.c b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-syslog.c
index 18aa7f707f..97810a7bbd 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-syslog.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/ieee128-syslog.c
@@ -52,6 +52,7 @@ ___ieee128___syslog_chk (int pri, int flag, const char *fmt, ...)
   __vsyslog_internal (pri, fmt, ap, mode);
   va_end (ap);
 }
+hidden_def (___ieee128___syslog_chk)
 strong_alias (___ieee128___syslog_chk, __syslog_chkieee128)
 
 void
-- 
2.41.0