lib: split off compiler magic into its own file

Also make timed notices available via CONFDATE.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

1 files changed, 81 insertions, 0 deletions

diff --git a/lib/compiler.h b/lib/compiler.h
new file mode 100644
index 0000000000..49a2f2a422
--- /dev/null
+++ b/lib/compiler.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2015-2017  David Lamparter, for NetDEF, Inc.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _FRR_COMPILER_H
+#define _FRR_COMPILER_H
+
+/* function attributes, use like
+ *   void prototype(void) __attribute__((_CONSTRUCTOR(100)));
+ */
+#if defined(__clang__)
+# if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 5)
+#  define _RET_NONNULL    , returns_nonnull
+# endif
+# define _CONSTRUCTOR(x)  constructor(x)
+#elif defined(__GNUC__)
+# if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)
+#  define _RET_NONNULL    , returns_nonnull
+# endif
+# if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
+#  define _CONSTRUCTOR(x) constructor(x)
+#  define _DESTRUCTOR(x)  destructor(x)
+#  define _ALLOC_SIZE(x)  alloc_size(x)
+# endif
+#endif
+
+#ifdef __sun
+/* Solaris doesn't do constructor priorities due to linker restrictions */
+# undef _CONSTRUCTOR
+# undef _DESTRUCTOR
+#endif
+
+/* fallback versions */
+#ifndef _RET_NONNULL
+# define _RET_NONNULL
+#endif
+#ifndef _CONSTRUCTOR
+# define _CONSTRUCTOR(x) constructor
+#endif
+#ifndef _DESTRUCTOR
+# define _DESTRUCTOR(x) destructor
+#endif
+#ifndef _ALLOC_SIZE
+# define _ALLOC_SIZE(x)
+#endif
+
+/*
+ * for warnings on macros, put in the macro content like this:
+ *   #define MACRO BLA CPP_WARN("MACRO has been deprecated")
+ */
+#define CPP_STR(X) #X
+
+#if defined(__ICC)
+#define CPP_NOTICE(text) _Pragma(CPP_STR(message __FILE__ ": " text))
+#define CPP_WARN(text) CPP_NOTICE(text)
+
+#elif (defined(__GNUC__)                                                       \
+       && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))           \
+	|| (defined(__clang__)                                                 \
+	    && (__clang_major__ >= 4                                           \
+		|| (__clang_major__ == 3 && __clang_minor__ >= 5)))
+#define CPP_WARN(text) _Pragma(CPP_STR(GCC warning text))
+#define CPP_NOTICE(text) _Pragma(CPP_STR(message text))
+
+#else
+#define CPP_WARN(text)
+#endif
+
+#endif /* _FRR_COMPILER_H */