* 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, 9 insertions, 23 deletions

diff --git a/unix/tclLoadDyld.c b/unix/tclLoadDyld.c
index 81f59be..332c6c1 100644
--- a/unix/tclLoadDyld.c
+++ b/unix/tclLoadDyld.c
@@ -12,7 +12,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclLoadDyld.c,v 1.23 2006/03/16 09:15:43 das Exp $
+ * RCS: @(#) $Id: tclLoadDyld.c,v 1.24 2006/07/20 06:18:38 das Exp $
  */
 
 #include "tclInt.h"
@@ -34,11 +34,7 @@ typedef struct Tcl_DyldLoadHandle {
 } Tcl_DyldLoadHandle;
 
 #ifdef TCL_LOAD_FROM_MEMORY
-typedef struct ThreadSpecificData {
-    int haveLoadMemory;
-} ThreadSpecificData;
-
-static Tcl_ThreadDataKey dataKey;
+MODULE_SCOPE long tclMacOSXDarwinRelease;
 #endif
 
 /*
@@ -389,23 +385,13 @@ TclpLoadMemoryGetBuffer(
     Tcl_Interp *interp,		/* Used for error reporting. */
     int size)			/* Size of desired buffer. */
 {
-    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
     void *buffer = NULL;
 
-    if (!tsdPtr->haveLoadMemory) {
-	/*
-	 * NSCreateObjectFileImageFromMemory is available but always fails
-	 * prior to Darwin 7.
-	 */
-
-	struct utsname name;
-
-	if (!uname(&name)) {
-	    long release = strtol(name.release, NULL, 10);
-	    tsdPtr->haveLoadMemory = (release >= 7) ? 1 : -1;
-	}
-    }
-    if (tsdPtr->haveLoadMemory > 0) {
+    /*
+     * NSCreateObjectFileImageFromMemory is available but always fails
+     * prior to Darwin 7.
+     */
+    if (tclMacOSXDarwinRelease >= 7) {
 	/*
 	 * We must allocate the buffer using vm_allocate, because
 	 * NSCreateObjectFileImageFromMemory will dispose of it using
@@ -478,14 +464,14 @@ TclpLoadMemory(
 	#define mh_size  sizeof(struct mach_header_64)
 #endif
 	
-	if (codeSize >= sizeof(struct fat_header)
+	if ((size_t) codeSize >= sizeof(struct fat_header)
 		&& fh->magic == OSSwapHostToBigInt32(FAT_MAGIC)) {
 	    /*
 	     * Fat binary, try to find mach_header for our architecture
 	     */
 	    uint32_t fh_nfat_arch = OSSwapBigToHostInt32(fh->nfat_arch);
 	    
-	    if (codeSize >= sizeof(struct fat_header) + 
+	    if ((size_t) codeSize >= sizeof(struct fat_header) + 
 		    fh_nfat_arch * sizeof(struct fat_arch)) {
 		void *fatarchs = buffer + sizeof(struct fat_header);
 		CONST NXArchInfo *arch = NXGetLocalArchInfo();