Index: src/m3core.h
===================================================================
RCS file: /usr/cvs/cm3/m3-libs/m3core/src/m3core.h,v
retrieving revision 1.42
diff -u -r1.42 m3core.h
--- src/m3core.h	9 May 2010 12:35:36 -0000	1.42
+++ src/m3core.h	20 May 2010 14:48:21 -0000
@@ -2,6 +2,28 @@
 #pragma once
 #endif
 
+/* http://gcc.gnu.org/wiki/Visibility */
+/* Generic helper definitions for shared library support */
+#if defined _WIN32 || defined __CYGWIN__
+  #define M3_DLL_IMPORT __declspec(dllimport)
+  #define M3_DLL_EXPORT __declspec(dllexport)
+  #define M3_DLL_LOCAL
+#else
+  #if __GNUC__ >= 4
+    #define M3_DLL_IMPORT __attribute__ ((visibility("default")))
+    #ifdef __APPLE__
+      #define M3_DLL_EXPORT __attribute__ ((visibility("default")))
+    #else
+      #define M3_DLL_EXPORT __attribute__ ((visibility("protected")))
+    #endif
+    #define M3_DLL_LOCAL  __attribute__ ((visibility("hidden")))
+  #else
+    #define M3_DLL_IMPORT
+    #define M3_DLL_EXPORT
+    #define M3_DLL_LOCAL
+  #endif
+#endif
+
 #ifndef INCLUDED_M3CORE_H
 #define INCLUDED_M3CORE_H
 
@@ -101,9 +123,9 @@
 
 #define M3WRAPNAMEx(a, b) a##__##b
 #define M3WRAPNAME(a, b) M3WRAPNAMEx(a, b)
-#define M3WRAP(ret, name, in, out)     M3EXTERNC_BEGIN ret __cdecl M3WRAPNAME(M3MODULE, name) in { return name out; } M3EXTERNC_END
+#define M3WRAP(ret, name, in, out)     M3EXTERNC_BEGIN M3_DLL_EXPORT ret __cdecl M3WRAPNAME(M3MODULE, name) in { return name out; } M3EXTERNC_END
 #ifdef _WIN32
-#define M3WRAP_(ret, name, in, out)    M3EXTERNC_BEGIN ret __cdecl M3WRAPNAME(M3MODULE, name) in { return _##name out; } M3EXTERNC_END
+#define M3WRAP_(ret, name, in, out)    M3EXTERNC_BEGIN M3_DLL_EXPORT ret __cdecl M3WRAPNAME(M3MODULE, name) in { return _##name out; } M3EXTERNC_END
 #else
 #define M3WRAP_(ret, name, in, out)    M3WRAP(ret, name, in, out)
 #endif
Index: src/Csupport/Common/dtoa.h
===================================================================
RCS file: /usr/cvs/cm3/m3-libs/m3core/src/Csupport/Common/dtoa.h,v
retrieving revision 1.12
diff -u -r1.12 dtoa.h
--- src/Csupport/Common/dtoa.h	25 Apr 2010 23:13:31 -0000	1.12
+++ src/Csupport/Common/dtoa.h	20 May 2010 14:48:21 -0000
@@ -279,6 +279,14 @@
 #include <math.h>
 #endif
 
+#if __GNUC__ >= 4
+#ifdef __APPLE__
+#pragma GCC visibility push(default)
+#else
+#pragma GCC visibility push(protected)
+#endif
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
Index: src/Csupport/Common/hand.c
===================================================================
RCS file: /usr/cvs/cm3/m3-libs/m3core/src/Csupport/Common/hand.c,v
retrieving revision 1.122
diff -u -r1.122 hand.c
--- src/Csupport/Common/hand.c	12 Apr 2010 14:30:42 -0000	1.122
+++ src/Csupport/Common/hand.c	20 May 2010 14:48:21 -0000
@@ -23,6 +23,14 @@
 
 #include <stddef.h>
 
+#if __GNUC__ >= 4
+#ifdef __APPLE__
+#pragma GCC visibility push(default)
+#else
+#pragma GCC visibility push(protected)
+#endif
+#endif
+
 #ifdef __cplusplus
 extern "C"
 {
Index: src/thread/PTHREAD/ThreadApple.c
===================================================================
RCS file: /usr/cvs/cm3/m3-libs/m3core/src/thread/PTHREAD/ThreadApple.c,v
retrieving revision 1.8
diff -u -r1.8 ThreadApple.c
--- src/thread/PTHREAD/ThreadApple.c	5 Mar 2010 12:54:44 -0000	1.8
+++ src/thread/PTHREAD/ThreadApple.c	20 May 2010 14:48:21 -0000
@@ -4,6 +4,10 @@
 
 #ifndef __APPLE__
 
+#if __GNUC__ >= 4
+#pragma GCC visibility push(hidden)
+#endif
+
 /* avoid empty file */
 
 void ThreadApple__Dummy(void)
@@ -32,6 +36,10 @@
 #include <architecture/ppc/cframe.h>
 #endif
 
+#if __GNUC__ >= 4
+#pragma GCC visibility push(hidden)
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
Index: src/thread/PTHREAD/ThreadFreeBSD.c
===================================================================
RCS file: /usr/cvs/cm3/m3-libs/m3core/src/thread/PTHREAD/ThreadFreeBSD.c,v
retrieving revision 1.8
diff -u -r1.8 ThreadFreeBSD.c
--- src/thread/PTHREAD/ThreadFreeBSD.c	25 Feb 2010 08:31:33 -0000	1.8
+++ src/thread/PTHREAD/ThreadFreeBSD.c	20 May 2010 14:48:21 -0000
@@ -4,6 +4,10 @@
 
 #ifndef __FreeBSD__
 
+#if __GNUC__ >= 4
+#pragma GCC visibility push(hidden)
+#endif
+
 /* avoid empty file */
 
 void ThreadFreeBSD__Dummy(void)
@@ -17,6 +21,10 @@
 #include <assert.h>
 #include <stdlib.h>
 
+#if __GNUC__ >= 4
+#pragma GCC visibility push(hidden)
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
Index: src/thread/PTHREAD/ThreadPThreadC.c
===================================================================
RCS file: /usr/cvs/cm3/m3-libs/m3core/src/thread/PTHREAD/ThreadPThreadC.c,v
retrieving revision 1.134
diff -u -r1.134 ThreadPThreadC.c
--- src/thread/PTHREAD/ThreadPThreadC.c	9 May 2010 09:21:29 -0000	1.134
+++ src/thread/PTHREAD/ThreadPThreadC.c	20 May 2010 14:48:21 -0000
@@ -24,6 +24,10 @@
 #include <semaphore.h>
 #endif
 
+#if __GNUC__ >= 4
+#pragma GCC visibility push(hidden)
+#endif
+
 #define M3MODULE ThreadPThread
 
 #if defined(__sparc) || defined(__ia64__)
Index: src/unix/Common/Uconstants.c
===================================================================
RCS file: /usr/cvs/cm3/m3-libs/m3core/src/unix/Common/Uconstants.c,v
retrieving revision 1.46
diff -u -r1.46 Uconstants.c
--- src/unix/Common/Uconstants.c	12 Apr 2010 12:15:31 -0000	1.46
+++ src/unix/Common/Uconstants.c	20 May 2010 14:48:21 -0000
@@ -34,6 +34,14 @@
 /* check that Uerror.Max=248 is enough; if you get an error here, raise it in Uerror.i3 and here */
 typedef int CheckMax[248 - sizeof(CheckMax_t)];
 
+#if __GNUC__ >= 4
+#ifdef __APPLE__
+#pragma GCC visibility push(default)
+#else
+#pragma GCC visibility push(protected)
+#endif
+#endif
+
 #undef X
 #define X(x) const int Uerror__##x = x;
 #include "UerrorX.h"
Index: src/unix/Common/UnixC.c
===================================================================
RCS file: /usr/cvs/cm3/m3-libs/m3core/src/unix/Common/UnixC.c,v
retrieving revision 1.59
diff -u -r1.59 UnixC.c
--- src/unix/Common/UnixC.c	9 May 2010 09:28:18 -0000	1.59
+++ src/unix/Common/UnixC.c	20 May 2010 14:48:21 -0000
@@ -48,7 +48,7 @@
 {
 #endif
 
-void __cdecl Unix__Assertions(void)
+M3_DLL_LOCAL void __cdecl Unix__Assertions(void)
 {
     /* make sure things are normal */
     M3_STATIC_ASSERT(CHAR_BIT == 8);
Index: src/unix/Common/UnixLink.c
===================================================================
RCS file: /usr/cvs/cm3/m3-libs/m3core/src/unix/Common/UnixLink.c,v
retrieving revision 1.10
diff -u -r1.10 UnixLink.c
--- src/unix/Common/UnixLink.c	16 Jan 2010 20:26:32 -0000	1.10
+++ src/unix/Common/UnixLink.c	20 May 2010 14:48:21 -0000
@@ -14,6 +14,14 @@
 #include <windows.h>
 #endif
 
+#if __GNUC__ >= 4
+#ifdef __APPLE__
+#pragma GCC visibility push(default)
+#else
+#pragma GCC visibility push(protected)
+#endif
+#endif
+
 #ifdef __cplusplus
 extern "C"
 {
Index: src/unix/Common/UstatC.c
===================================================================
RCS file: /usr/cvs/cm3/m3-libs/m3core/src/unix/Common/UstatC.c,v
retrieving revision 1.27
diff -u -r1.27 UstatC.c
--- src/unix/Common/UstatC.c	1 May 2010 07:20:52 -0000	1.27
+++ src/unix/Common/UstatC.c	20 May 2010 14:48:21 -0000
@@ -1,5 +1,13 @@
 #include "m3core.h"
 
+#if __GNUC__ >= 4
+#ifdef __APPLE__
+#pragma GCC visibility push(default)
+#else
+#pragma GCC visibility push(protected)
+#endif
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif