* 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/tclMacOSXNotify.c (Tcl_InitNotifier):     add support for
	* unix/tclUnixFCmd.c (DoRenameFile, CopyFileAtts): weakly importing
	* unix/tclUnixInit.c (TclpSetInitialEncodings):    symbols not available
	on OSX 10.2 or 10.3, enables binaires built on later OSX versions to run
	on earlier ones.
	* 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.
	* unix/configure: autoconf-2.13

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

1 files changed, 69 insertions, 24 deletions

diff --git a/unix/configure.in b/unix/configure.in
index 13bc03e..c4dc1b3 100644
--- a/unix/configure.in
+++ b/unix/configure.in
@@ -3,7 +3,7 @@ dnl	This file is an input file used by the GNU "autoconf" program to
 dnl	generate the file "configure", which is run during Tcl installation
 dnl	to configure the system for the local environment.
 #
-# RCS: @(#) $Id: configure.in,v 1.106.2.27 2006/05/04 13:09:19 dgp Exp $
+# RCS: @(#) $Id: configure.in,v 1.106.2.28 2006/07/20 06:21:45 das Exp $
 
 AC_INIT(../generic/tcl.h)
 AC_PREREQ(2.13)
@@ -133,6 +133,13 @@ AC_CHECK_FUNC(strerror, , [AC_DEFINE(NO_STRERROR)])
 AC_CHECK_FUNC(getwd, , [AC_DEFINE(NO_GETWD)])
 AC_CHECK_FUNC(wait3, , [AC_DEFINE(NO_WAIT3)])
 AC_CHECK_FUNC(uname, , [AC_DEFINE(NO_UNAME)])
+
+if test "`uname -s`" = "Darwin" && test "${TCL_THREADS}" = 1 && \
+	test "`uname -r | awk -F. '{print [$]1}'`" -lt 7; then
+    # prior to Darwin 7, realpath is not threadsafe, so don't
+    # use it when threads are enabled, c.f. bug # 711232
+    ac_cv_func_realpath=no
+fi
 AC_CHECK_FUNC(realpath, , [AC_DEFINE(NO_REALPATH)])
 
 #---------------------------------------------------------------------------
@@ -153,14 +160,14 @@ SC_SERIAL_PORT
 #	special flag.
 #--------------------------------------------------------------------
 
-AC_CACHE_CHECK([for fd_set in sys/types], tcl_cv_type_fd_set,
+AC_CACHE_CHECK([for fd_set in sys/types], tcl_cv_type_fd_set, [
     AC_TRY_COMPILE([#include <sys/types.h>],[fd_set readMask, writeMask;],
-	tcl_cv_type_fd_set=yes, tcl_cv_type_fd_set=no))
+	tcl_cv_type_fd_set=yes, tcl_cv_type_fd_set=no)])
 tcl_ok=$tcl_cv_type_fd_set
 if test $tcl_ok = no; then
-    AC_CACHE_CHECK([for fd_mask in sys/select], tcl_cv_grep_fd_mask,
+    AC_CACHE_CHECK([for fd_mask in sys/select], tcl_cv_grep_fd_mask, [
 	AC_EGREP_HEADER(fd_mask, sys/select.h,
-	     tcl_cv_grep_fd_mask=present, tcl_cv_grep_fd_mask=missing))
+	     tcl_cv_grep_fd_mask=present, tcl_cv_grep_fd_mask=missing)])
     if test $tcl_cv_grep_fd_mask = present; then
 	AC_DEFINE(HAVE_SYS_SELECT_H)
 	tcl_ok=yes
@@ -295,8 +302,8 @@ AC_TYPE_PID_T
 AC_TYPE_SIZE_T
 AC_TYPE_UID_T
 
-AC_CACHE_CHECK([for socklen_t], ac_cv_type_socklen_t,
-    [AC_EGREP_CPP(changequote(<<,>>)dnl
+AC_CACHE_CHECK([for socklen_t], ac_cv_type_socklen_t, [
+    AC_EGREP_CPP(changequote(<<,>>)dnl
 <<(^|[^a-zA-Z_0-9])socklen_t[^a-zA-Z_0-9]>>dnl
 changequote([,]),[
     #include <sys/types.h>
@@ -327,13 +334,13 @@ AC_CHECK_FUNC(opendir, , [AC_DEFINE(USE_DIRENT2_H)])
 #	the trick.
 #--------------------------------------------------------------------
 
-AC_CACHE_CHECK([union wait], tcl_cv_union_wait,
+AC_CACHE_CHECK([union wait], tcl_cv_union_wait, [
     AC_TRY_LINK([#include <sys/types.h> 
 #include <sys/wait.h>], [
 union wait x;
 WIFEXITED(x);		/* Generates compiler error if WIFEXITED
 			 * uses an int. */
-    ], tcl_cv_union_wait=yes, tcl_cv_union_wait=no))
+    ], tcl_cv_union_wait=yes, tcl_cv_union_wait=no)])
 if test $tcl_cv_union_wait = no; then
     AC_DEFINE(NO_UNION_WAIT)
 fi
@@ -370,9 +377,9 @@ AC_CHECK_FUNC(BSDgettimeofday,
     [AC_DEFINE(HAVE_BSDGETTIMEOFDAY)], [
     AC_CHECK_FUNC(gettimeofday, , [AC_DEFINE(NO_GETTOD)])
 ])
-AC_CACHE_CHECK([for gettimeofday declaration], tcl_cv_grep_gettimeofday,
+AC_CACHE_CHECK([for gettimeofday declaration], tcl_cv_grep_gettimeofday, [
     AC_EGREP_HEADER(gettimeofday, sys/time.h,
-	tcl_cv_grep_gettimeofday=present, tcl_cv_grep_gettimeofday=missing))
+	tcl_cv_grep_gettimeofday=present, tcl_cv_grep_gettimeofday=missing)])
 if test $tcl_cv_grep_gettimeofday = missing ; then
     AC_DEFINE(GETTOD_NOT_DECLARED)
 fi
@@ -384,11 +391,11 @@ fi
 #--------------------------------------------------------------------
 
 AC_C_CHAR_UNSIGNED
-AC_CACHE_CHECK([signed char declarations], tcl_cv_char_signed,
+AC_CACHE_CHECK([signed char declarations], tcl_cv_char_signed, [
     AC_TRY_COMPILE(, [
 	signed char *p;
 	p = 0;
-	], tcl_cv_char_signed=yes, tcl_cv_char_signed=no))
+	], tcl_cv_char_signed=yes, tcl_cv_char_signed=no)])
 if test $tcl_cv_char_signed = yes; then
     AC_DEFINE(HAVE_SIGNED_CHAR)
 fi
@@ -397,7 +404,7 @@ fi
 #  Does putenv() copy or not?  We need to know to avoid memory leaks.
 #--------------------------------------------------------------------
 
-AC_CACHE_CHECK([for a putenv() that copies the buffer], tcl_cv_putenv_copy,
+AC_CACHE_CHECK([for a putenv() that copies the buffer], tcl_cv_putenv_copy, [
     AC_TRY_RUN([
 	#include <stdlib.h>
 	#define OURVAR "havecopy=yes"
@@ -419,8 +426,7 @@ AC_CACHE_CHECK([for a putenv() that copies the buffer], tcl_cv_putenv_copy,
     ],
     tcl_cv_putenv_copy=no,
     tcl_cv_putenv_copy=yes,
-    tcl_cv_putenv_copy=no)
-)
+    tcl_cv_putenv_copy=no)])
 if test $tcl_cv_putenv_copy = yes; then
     AC_DEFINE(HAVE_PUTENV_THAT_COPIES)
 fi
@@ -432,19 +438,58 @@ fi
 SC_ENABLE_LANGINFO
 
 #--------------------------------------------------------------------
+# Darwin specific API checks and defines
+#--------------------------------------------------------------------
+
+if test "`uname -s`" = "Darwin" ; then
+    AC_CHECK_HEADERS(copyfile.h)
+    AC_CHECK_FUNCS(copyfile)
+    if test $tcl_corefoundation = yes; then
+	AC_CHECK_HEADERS(libkern/OSAtomic.h)
+	AC_CHECK_FUNCS(OSSpinLockLock)
+	AC_CHECK_FUNCS(pthread_atfork)
+    fi
+    AC_DEFINE(USE_VFORK)
+    AC_DEFINE(TCL_DEFAULT_ENCODING, "utf-8")
+    AC_DEFINE(TCL_LOAD_FROM_MEMORY)
+    AC_CHECK_HEADERS(AvailabilityMacros.h)
+    if test "$ac_cv_header_AvailabilityMacros_h" = yes; then
+	AC_CACHE_CHECK([if weak import is available], tcl_cv_cc_weak_import, [
+	    hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror"
+	    AC_TRY_LINK([
+		    #ifdef __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
+		    #if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1020
+		    #error __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1020
+		    #endif
+		    #elif MAC_OS_X_VERSION_MIN_REQUIRED < 1020
+		    #error MAC_OS_X_VERSION_MIN_REQUIRED < 1020
+		    #endif
+		    int rand(void) __attribute__((weak_import));
+		], [rand();],
+		tcl_cv_cc_weak_import=yes, tcl_cv_cc_weak_import=no)
+	    CFLAGS=$hold_cflags])
+	if test $tcl_cv_cc_weak_import = yes; then
+	    AC_DEFINE(HAVE_WEAK_IMPORT)
+	fi
+    fi
+fi
+
+#--------------------------------------------------------------------
 # Check for support of fts functions (readdir replacement)
 #--------------------------------------------------------------------
 
 AC_CACHE_CHECK([for fts], tcl_cv_api_fts, [
-    AC_TRY_LINK([#include <sys/param.h>
-            #include <sys/stat.h>
-            #include <fts.h>], 
-        [char*const p[2] = {"/", NULL};
-            FTS *f = fts_open(p, FTS_PHYSICAL|FTS_NOCHDIR|FTS_NOSTAT, NULL);
-            FTSENT *e = fts_read(f); fts_close(f);], 
-        tcl_cv_api_fts=yes, tcl_cv_api_fts=no)])
+    AC_TRY_LINK([
+	    #include <sys/param.h>
+	    #include <sys/stat.h>
+	    #include <fts.h>
+	], [
+	    char*const p[2] = {"/", NULL};
+	    FTS *f = fts_open(p, FTS_PHYSICAL|FTS_NOCHDIR|FTS_NOSTAT, NULL);
+	    FTSENT *e = fts_read(f); fts_close(f);
+	], tcl_cv_api_fts=yes, tcl_cv_api_fts=no)])
 if test $tcl_cv_api_fts = yes; then
-    AC_DEFINE(HAVE_FTS, 1, [Do we have fts functions?])
+    AC_DEFINE(HAVE_FTS)
 fi
 
 #--------------------------------------------------------------------