Centralize glibc/gcc attributes

Make a common header file that collects up all used attributes.
Switch a couple places to use it. NOTE: the ones that are in the
shipped API cannot use gcc-attributes or we have to ship it, too.

Author: stevegrubb

Makefile.am

@@ -33,6 +33,7 @@ EXTRA_DIST = ChangeLog AUTHORS NEWS README.md INSTALL \
 	contrib/libauplugin/Makefile \
 	contrib/libauplugin/auplugin-example.c \
 	contrib/libauplugin/auplugin-example.conf
+noinst_HEADERS = gcc-attributes.h
 
 CONFIG_CLEAN_FILES = debug*.list config/*
 

auparse/interpret.h

@@ -28,6 +28,7 @@
 #include "dso.h"
 #include "rnode.h"
 #include <time.h>
+#include "gcc-attributes.h"
 
 #define NEVER_LOADED 0xFFFF
 

common/common.h

@@ -29,31 +29,7 @@
 #endif
 #include <sys/types.h>
 #include "dso.h"
-// These macros originate in sys/cdefs.h
-#ifndef __attr_access
-#  define __attr_access(x)
-#endif
-#ifndef __attribute_malloc__
-#  define __attribute_malloc__
-#endif
-#ifndef __attr_dealloc
-#  define __attr_dealloc(dealloc, argno)
-#endif
-#ifndef __wur
-# define __wur
-#endif
-#ifndef __has_attribute
-# define __has_attribute(x) 0
-#endif
-#ifndef __attribute_const__
-# define __attribute_const__
-#endif
-#ifndef __attribute_pure__
-# define __attribute_pure__
-#endif
-#ifndef __nonnull
-# define __nonnull(params)
-#endif
+#include "gcc-attributes.h"
 
 /* Wrapper macros for optional atomics
  * Note: ATOMIC_INT and ATOMIC_UNSIGNED are defined in config.h */

gcc-attributes.h

@@ -0,0 +1,50 @@
+/* gcc-attributes.h -- compatibility wrappers for GCC function attributes
+ * Copyright 2025 Red Hat Inc.
+ * All Rights Reserved.
+ *
+ * This 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.
+ *
+ * This 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef AUDIT_GCC_ATTRIBUTES_H
+#define AUDIT_GCC_ATTRIBUTES_H
+
+/* These macros originate in sys/cdefs.h but may be missing on some libc
+ * implementations (e.g. musl). Provide fallbacks when they are undefined.
+ */
+#ifndef __has_attribute
+# define __has_attribute(x) 0
+#endif
+
+#ifndef __attr_access
+# define __attr_access(x)
+#endif
+
+#ifndef __attribute_malloc__
+# define __attribute_malloc__
+#endif
+
+#ifndef __attr_dealloc
+# define __attr_dealloc(dealloc, argno)
+#endif
+
+#ifndef __attr_dealloc_free
+# define __attr_dealloc_free
+#endif
+
+#ifndef __wur
+# define __wur
+#endif
+
+#endif /* AUDIT_GCC_ATTRIBUTES_H */