[src/trunk]: src/sys/sys While visibility "protected" is nominaly supported b...

[martin <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/6a3ff6179a58
branches:  trunk
changeset: 787018:6a3ff6179a58
user:      martin <martin%NetBSD.org@localhost>
date:      Wed May 29 19:02:30 2013 +0000

description:
While visibility "protected" is nominaly supported by gcc 4.0 and 4.1
it does not actually work - the compiler does not emmit ".protected"
asm statements for used references to protected symbols, which then
causes the linker to fail and/or produce unloadable libraries.
This recently happened to port vax by the locale changes.

Backporting a fix (ASM_OUTPUT_EXTERNAL in gcc target config) is not
feasible.

So: define __dso_protected only starting with gcc 4.2.

diffstat:

 sys/sys/cdefs.h |  9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diffs (36 lines):

diff -r fa45e9ace971 -r 6a3ff6179a58 sys/sys/cdefs.h
--- a/sys/sys/cdefs.h   Wed May 29 15:22:19 2013 +0000
+++ b/sys/sys/cdefs.h   Wed May 29 19:02:30 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cdefs.h,v 1.106 2013/04/30 14:45:15 joerg Exp $        */
+/*     $NetBSD: cdefs.h,v 1.107 2013/05/29 19:02:30 martin Exp $       */
 
 /*
  * Copyright (c) 1991, 1993
@@ -281,7 +281,6 @@
 #if __GNUC_PREREQ__(4, 0)
 #  define __dso_public __attribute__((__visibility__("default")))
 #  define __dso_hidden __attribute__((__visibility__("hidden")))
-#  define __dso_protected      __attribute__((__visibility__("protected")))
 #  define __BEGIN_PUBLIC_DECLS \
        _Pragma("GCC visibility push(default)") __BEGIN_EXTERN_C
 #  define __END_PUBLIC_DECLS   __END_EXTERN_C _Pragma("GCC visibility pop")
@@ -290,13 +289,17 @@
 #  define __END_HIDDEN_DECLS   __END_EXTERN_C _Pragma("GCC visibility pop")
 #else
 #  define __dso_public
-#  define __dso_protected
 #  define __dso_hidden
 #  define __BEGIN_PUBLIC_DECLS __BEGIN_EXTERN_C
 #  define __END_PUBLIC_DECLS   __END_EXTERN_C
 #  define __BEGIN_HIDDEN_DECLS __BEGIN_EXTERN_C
 #  define __END_HIDDEN_DECLS   __END_EXTERN_C
 #endif
+#if __GNUC_PREREQ__(4, 2)
+#  define __dso_protected      __attribute__((__visibility__("protected")))
+#else
+#  define __dso_protected
+#endif
 
 #define        __BEGIN_DECLS           __BEGIN_PUBLIC_DECLS
 #define        __END_DECLS             __END_PUBLIC_DECLS