* macosx/tclMacOSXNotify.c (Tcl_InitNotifier, Tcl_WaitForEvent): create

	notifier thread lazily upon first call to Tcl_WaitForEvent() rather than
	in Tcl_InitNotifier(). Allows calling exeve() in processes where the
	event loop has not yet been run (Darwin's execve() fails in processes
	with more than one thread), in particular allows embedders to call
	fork() followed by execve(), previously the pthread_atfork() child
	handler's call to Tcl_InitNotifier() would immediately recreate the
	notifier thread in the child after a fork.

	* macosx/tclMacOSXFCmd.c (TclMacOSXCopyFileAttributes):    add support
	* macosx/tclMacOSXNotify.c (Tcl_InitNotifier):             for weakly
	* unix/tclUnixInit.c (Tcl_GetEncodingNameFromEnvironment): importing
	symbols not available on OSX 10.2 or 10.3, enables binaires built on
	later OSX versions to run on earlier ones.
	* macosx/Tcl.xcodeproj/project.pbxproj: enable weak-linking; turn on
	                                        extra warnings.
	* macosx/README: document how to enable weak-linking; cleanup.
	* unix/tclUnixPort.h: add support for weak-linking; conditionalize
	AvailabilityMacros.h inclusion; only disable realpath on 10.2 or earlier
	when threads are enabled.
	* unix/tclLoadDyld.c (TclpLoadMemoryGetBuffer): change runtime Darwin
	* unix/tclUnixInit.c (TclpInitPlatform):        release check to use
	                                                global initialized once.
	* unix/tclUnixFCmd.c (DoRenameFile, TclpObjNormalizePath): add runtime
	Darwin release check to determine if realpath is threadsafe.
	* unix/configure.in: add check on Darwin for compiler support of weak
	* unix/tcl.m4:       import and for AvailabilityMacros.h header;
	move Darwin specific checks & defines that are only relevant to the tcl
	build out of tcl.m4; restrict framework option to Darwin; cleanup
	quoting and help messages.
	* unix/configure: autoconf-2.59
	* unix/tclConfig.h.in: autoheader-2.59

	* unix/tclLoadDyld.c (TclpLoadMemory): fix signed-with-unsigned
	comparison and other warnings from gcc4 -Wextra.

1 files changed, 24 insertions, 6 deletions

diff --git a/macosx/tclMacOSXFCmd.c b/macosx/tclMacOSXFCmd.c
index 80e9785..51fe222 100644
--- a/macosx/tclMacOSXFCmd.c
+++ b/macosx/tclMacOSXFCmd.c
@@ -10,7 +10,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclMacOSXFCmd.c,v 1.8 2006/03/21 11:06:23 das Exp $
+ * RCS: @(#) $Id: tclMacOSXFCmd.c,v 1.9 2006/07/20 06:18:37 das Exp $
  */
 
 #include "tclInt.h"
@@ -21,7 +21,7 @@
 #include <libkern/OSByteOrder.h>
 #endif
 
-/* Darwin 8 copyfile API */
+/* Darwin 8 copyfile API. */
 #ifdef HAVE_COPYFILE
 #ifdef HAVE_COPYFILE_H
 #include <copyfile.h>
@@ -30,8 +30,14 @@ int copyfile(const char *from, const char *to, void *state, uint32_t flags);
 #define COPYFILE_ACL            (1<<0)
 #define COPYFILE_XATTR          (1<<2)
 #define COPYFILE_NOFOLLOW_SRC   (1<<18)
-#endif
-#endif
+#endif /* HAVE_COPYFILE_H */
+#if defined(HAVE_WEAK_IMPORT) && MAC_OS_X_VERSION_MIN_REQUIRED < 1040
+/* Support for weakly importing copyfile. */
+#define WEAK_IMPORT_COPYFILE
+extern int copyfile(const char *from, const char *to, void *state,
+                    uint32_t flags) WEAK_IMPORT_ATTRIBUTE;
+#endif /* HAVE_WEAK_IMPORT */
+#endif /* HAVE_COPYFILE */
 
 #include <libkern/OSByteOrder.h>
 
@@ -365,14 +371,22 @@ TclMacOSXCopyFileAttributes(
     CONST Tcl_StatBuf *statBufPtr)
 				/* Stat info for source file */
 {
-#if defined(HAVE_COPYFILE)
+#ifdef WEAK_IMPORT_COPYFILE
+    if (copyfile != NULL) {
+#endif
+#ifdef HAVE_COPYFILE
     if (copyfile(src, dst, NULL, COPYFILE_XATTR |
 	    (S_ISLNK(statBufPtr->st_mode) ? COPYFILE_NOFOLLOW_SRC :
 		                            COPYFILE_ACL)) < 0) {
 	return TCL_ERROR;
     }
     return TCL_OK;
-#elif defined(HAVE_GETATTRLIST)
+#endif /* HAVE_COPYFILE */
+#ifdef WEAK_IMPORT_COPYFILE
+    } else {
+#endif
+#if !defined(HAVE_COPYFILE) || defined(WEAK_IMPORT_COPYFILE)
+#ifdef HAVE_GETATTRLIST
     struct attrlist alist;
     fileinfobuf finfo;
     off_t *rsrcForkSize = (off_t*)(&finfo.data);
@@ -430,6 +444,10 @@ TclMacOSXCopyFileAttributes(
     return TCL_OK;
 #else
     return TCL_ERROR;
+#endif /* HAVE_GETATTRLIST */
+#endif /* !defined(HAVE_COPYFILE) || defined(WEAK_IMPORT_COPYFILE) */
+#ifdef WEAK_IMPORT_COPYFILE
+    }
 #endif
 }