Patch 976520 reworks several of the details involved with

        startup/initialization of the Tcl library, focused on the
        activities of Tcl_FindExecutable().

        * generic/tclIO.c:      Removed bogus claim in comment that
        encoding "iso8859-1" is "built-in" to Tcl.

        * generic/tclInt.h:     Created a new struct ProcessGlobalValue,
        * generic/tclUtil.c:    routines Tcl(Get|Set)ProcessGlobalValue,
        and function type TclInitProcessGlobalValueProc.  Together, these
        take care of the housekeeping for "values" (things that can be
        held in a Tcl_Obj) that are global across a whole process.  That is,
        they are shared among multiple threads, and epoch and mutex
        protection must govern the validity of cached copies maintained
        in each thread.

        * generic/tclNotify.c:  Modified TclInitNotifier() to tolerate
        being called multiple times in the same thread.

        * generic/tclEvent.c:   Dropped the unused argv0 argument to
        TclInitSubsystems().  Removed machinery to unsure only one
        TclInitNotifier() call per thread, now that that is safe.
        Converted Tcl(Get|Set)LibraryPath to use a ProcessGlobalValue,
        and moved them to tclEncoding.c.
        * generic/tclBasic.c:   Updated caller.

        * generic/tclInt.h:     TclpFindExecutable now returns void.
        * unix/tclUnixFile.c:
        * win/tclWinFile.c:
        * win/tclWinPipe.c:

        * generic/tclEncoding.c: Built new encoding search initialization
        on a foundation of ProcessGlobalValues, exposing new routines
        Tcl(Get|Set)EncodingSearchPath.  A cache of a map from encoding name
        to directory pathname keeps track of where encodings are available
        for loading.  Tcl_FindExecutable greatly simplified into just
        three function calls.  The "library path" is now misnamed, as its
        only remaining purpose is as a foundation for the default encoding
        search path.

        * generic/tclInterp.c:  Inlined the initScript that is evaluated
        by Tcl_Init().  Added verification after initScript evaluation
        that Tcl can find its installed *.enc files, and that it has
        initialized [encoding system] in agreement with what the environment
        expects.  [tclInit] no longer driven by the value of $::tcl_libPath;
        it largely constructs its own search path now, rather than attempt
        to share one with the encoding system.

        * unix/tclUnixInit.c:   TclpSetInitialEncodings factored so that a new
        * win/tclWinInit.c:     routine TclpGetEncodingNameFromEnvironment
        can reveal that Tcl thinks the [encoding system] should be, even
        when an incomplete encoding search path, or a missing *.enc file
        won't allow that initialization to succeed.  TclpInitLibraryPath
        reworked as an initializer of a ProcessGlobalValue.

        * unix/tclUnixTest.c:   Update implementations of [testfindexecutable],
        [testgetdefenc], and [testsetdefenc].

        * tests/unixInit.test:  Corrected tests to operate properly even
        when a value of TCL_LIBRARY is required to find encodings.

        * generic/tclInt.decls: New internal stubs: TclGetEncodingSearchPath,
        TclSetEncodingSearchPath, TclpGetEncodingNameFromEnvironment.  These
        are candidates for public exposure by future TIPs.

        * generic/tclIntDecls.h:        make genstubs
        * generic/tclStubInit.c:

        * generic/tclTest.c:    Updated [testencoding] to use
        * tests/encoding.test:  Tcl(Get|Set)EncodingSearchPath.  Updated tests.

2 files changed, 88 insertions, 27 deletions

diff --git a/tests/encoding.test b/tests/encoding.test
index 97ae787..897bebf 100644
--- a/tests/encoding.test
+++ b/tests/encoding.test
@@ -8,7 +8,7 @@
 # See the file "license.terms" for information on usage and redistribution
 # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 #
-# RCS: @(#) $Id: encoding.test,v 1.20 2004/05/07 20:01:23 rmax Exp $
+# RCS: @(#) $Id: encoding.test,v 1.21 2004/11/30 19:34:51 dgp Exp $
 
 package require tcltest 2
 namespace import -force ::tcltest::*
@@ -95,7 +95,7 @@ test encoding-4.1 {Tcl_GetEncodingNames} {testencoding} {
     foreach encoding [encoding names] {
 	set encodings($encoding) 1
     }
-    testencoding path [list [pwd]]
+    testencoding path [list [file join [pwd] encoding]]
     foreach encoding [encoding names] {
 	if {![info exists encodings($encoding)]} {
 	    lappend x $encoding
@@ -237,7 +237,7 @@ test encoding-11.6 {LoadEncodingFile: invalid file} {testencoding} {
     set path [testencoding path]
     encoding system identity
     cd [temporaryDirectory]
-    testencoding path tmp
+    testencoding path [file join tmp encoding]
     makeDirectory tmp
     makeDirectory [file join tmp encoding]
     set f [open [file join tmp encoding splat.enc] w]
diff --git a/tests/unixInit.test b/tests/unixInit.test
index 22840fb..f42c868 100644
--- a/tests/unixInit.test
+++ b/tests/unixInit.test
@@ -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: unixInit.test,v 1.43 2004/11/22 21:24:31 dgp Exp $
+# RCS: @(#) $Id: unixInit.test,v 1.44 2004/11/30 19:34:51 dgp Exp $
 
 package require tcltest 2
 namespace import -force ::tcltest::*
@@ -113,8 +113,15 @@ test unixInit-2.0 {TclpInitLibraryPath: setting tclDefaultEncodingDir} \
     testsetdefenc $origDir
     set path
 } {slappy}
-test unixInit-2.1 {TclpInitLibraryPath: value of installLib, developLib} \
-	{unix stdio } {
+test unixInit-2.1 {TclpInitLibraryPath: value of installLib, developLib} -constraints {
+    unix stdio
+} -setup {
+    unset -nocomplain oldlibrary
+    if {[info exists env(TCL_LIBRARY)]} {
+	set oldlibrary $env(TCL_LIBRARY)
+	unset env(TCL_LIBRARY)
+    }
+} -body {
     set path [getlibpath]
 
     set installLib lib/tcl[info tclversion]
@@ -122,13 +129,19 @@ test unixInit-2.1 {TclpInitLibraryPath: value of installLib, developLib} \
     set prefix [file dirname [file dirname [interpreter]]]
 
     set x {}
-    lappend x [string compare [lindex $path 2] $prefix/$installLib]
-    lappend x [string compare [lindex $path 6] [file dirname $prefix]/$developLib]
+    lappend x [string compare [lindex $path 0] $prefix/$installLib]
+    lappend x [string compare [lindex $path 4] [file dirname $prefix]/$developLib]
     set x
-} {0 0}
+} -cleanup {
+    if {[info exists oldlibrary]} {
+	set env(TCL_LIBRARY) $oldlibrary
+	unset oldlibrary
+    }
+} -result {0 0}
 test unixInit-2.2 {TclpInitLibraryPath: TCL_LIBRARY} -constraints {
     unix stdio 
 } -setup {
+    unset -nocomplain oldlibrary
     if {[info exists env(TCL_LIBRARY)]} {
 	set oldlibrary $env(TCL_LIBRARY)
     }
@@ -149,6 +162,7 @@ test unixInit-2.2 {TclpInitLibraryPath: TCL_LIBRARY} -constraints {
 test unixInit-2.3 {TclpInitLibraryPath: TCL_LIBRARY wrong version} -constraints {
     unix stdio 
 } -setup {
+    unset -nocomplain oldlibrary
     if {[info exists env(TCL_LIBRARY)]} {
 	set oldlibrary $env(TCL_LIBRARY)
     }
@@ -167,7 +181,7 @@ test unixInit-2.3 {TclpInitLibraryPath: TCL_LIBRARY wrong version} -constraints
     }
 } -result [list /a/b/tcl1.7 /a/b/tcl[info tclversion]]
 test unixInit-2.4 {TclpInitLibraryPath: TCL_LIBRARY: INTL} -constraints {
-    unix stdio 
+    unix stdio knownBug
 } -setup {
     if {[info exists env(TCL_LIBRARY)]} {
 	set oldlibrary $env(TCL_LIBRARY)
@@ -191,8 +205,14 @@ test unixInit-2.5 {TclpInitLibraryPath: compiled-in library path} \
 	{emptyTest unix} {
     # cannot test
 } {}
-test unixInit-2.6 {TclpInitLibraryPath: executable relative} \
-	{unix stdio } {
+test unixInit-2.6 {TclpInitLibraryPath: executable relative} -constraints {
+    unix stdio
+} -setup {
+    unset -nocomplain oldlibrary
+    if {[info exists env(TCL_LIBRARY)]} {
+	set oldlibrary $env(TCL_LIBRARY)
+    }
+    set env(TCL_LIBRARY) [info library]
     makeDirectory tmp
     makeDirectory [file join tmp sparkly]
     makeDirectory [file join tmp sparkly bin]
@@ -201,17 +221,23 @@ test unixInit-2.6 {TclpInitLibraryPath: executable relative} \
     makeDirectory [file join tmp sparkly lib]
     makeDirectory [file join tmp sparkly lib tcl[info tclversion]]
     makeFile {} [file join tmp sparkly lib tcl[info tclversion] init.tcl]
-
-    set x [lrange [getlibpath [file join [temporaryDirectory] tmp sparkly \
-	    bin tcltest]] 2 3]
+} -body {
+    lrange [getlibpath [file join [temporaryDirectory] tmp sparkly \
+	    bin tcltest]] 1 2
+} -cleanup {
     removeFile [file join tmp sparkly lib tcl[info tclversion] init.tcl]
     removeDirectory [file join tmp sparkly lib tcl[info tclversion]]
     removeDirectory [file join tmp sparkly lib]
     removeDirectory [file join tmp sparkly bin]
     removeDirectory [file join tmp sparkly]
     removeDirectory tmp
-    set x
-} [list [temporaryDirectory]/tmp/sparkly/lib/tcl[info tclversion] [temporaryDirectory]/tmp/lib/tcl[info tclversion]]
+    unset env(TCL_LIBRARY)
+    if {[info exists oldlibrary]} {
+	set env(TCL_LIBRARY) $oldlibrary
+	unset oldlibrary
+    }
+} -result [list [temporaryDirectory]/tmp/sparkly/lib/tcl[info tclversion] [temporaryDirectory]/tmp/lib/tcl[info tclversion]]
+
 test unixInit-2.7 {TclpInitLibraryPath: compiled-in library path} \
 	{emptyTest unix} {
     # would need test command to get defaultLibDir and compare it to
@@ -226,7 +252,14 @@ test unixInit-2.7 {TclpInitLibraryPath: compiled-in library path} \
 testConstraint noSparkly [expr {![file exists [file join /tmp sparkly]]}]
 testConstraint noTmpInstall [expr {![file exists \
 				[file join /tmp lib tcl[info tclversion]]]}]
-test unixInit-2.8 {TclpInitLibraryPath: all absolute pathtype} {unix noSparkly noTmpInstall } {
+test unixInit-2.8 {TclpInitLibraryPath: all absolute pathtype} -constraints {
+    unix noSparkly noTmpInstall
+} -setup {
+    unset -nocomplain oldlibrary
+    if {[info exists env(TCL_LIBRARY)]} {
+	set oldlibrary $env(TCL_LIBRARY)
+    }
+    set env(TCL_LIBRARY) [info library]
     # Checking for Bug 219416
     # When a program that embeds the Tcl library, like tcltest, is
     # installed near the "root" of the file system, there was a problem
@@ -261,6 +294,7 @@ test unixInit-2.8 {TclpInitLibraryPath: all absolute pathtype} {unix noSparkly n
     # ../lib/tcl$version relative to the executable.
     file mkdir /tmp/lib/tcl[info tclversion]
     close [open /tmp/lib/tcl[info tclversion]/init.tcl w]
+} -body {
 
     # Check that all directories in the library path are absolute pathnames
     set allAbsolute 1
@@ -268,16 +302,29 @@ test unixInit-2.8 {TclpInitLibraryPath: all absolute pathtype} {unix noSparkly n
 	set allAbsolute [expr {$allAbsolute \
 		&& [string equal absolute [file pathtype $dir]]}]
     }
+    set allAbsolute
+} -cleanup {
 
     # Clean up temporary installation
     file delete -force /tmp/sparkly
     file delete -force /tmp/lib/tcl[info tclversion]
     if {$deletelib} {file delete -force /tmp/lib}
-    set allAbsolute
-} 1
+    unset env(TCL_LIBRARY)
+    if {[info exists oldlibrary]} {
+	set env(TCL_LIBRARY) $oldlibrary
+	unset oldlibrary
+    }
+} -result 1
 testConstraint noTmpBuild [expr {![file exists [file join /tmp library]]}]
-test unixInit-2.9 {TclpInitLibraryPath: paths relative to executable} {unix noSparkly noTmpBuild } {
+test unixInit-2.9 {TclpInitLibraryPath: paths relative to executable} -constraints {
+    unix noSparkly noTmpBuild
+} -setup {
     # Checking for Bug 438014
+    unset -nocomplain oldlibrary
+    if {[info exists env(TCL_LIBRARY)]} {
+	set oldlibrary $env(TCL_LIBRARY)
+    }
+    set env(TCL_LIBRARY) [info library]
     file delete -force /tmp/sparkly
     file delete -force /tmp/library
     file mkdir /tmp/sparkly
@@ -285,18 +332,27 @@ test unixInit-2.9 {TclpInitLibraryPath: paths relative to executable} {unix noSp
 
     file mkdir /tmp/library/
     close [open /tmp/library/init.tcl w]
-
-    set x [lrange [getlibpath /tmp/sparkly/tcltest] 2 6]
-
+} -body {
+    lrange [getlibpath /tmp/sparkly/tcltest] 1 5
+} -cleanup {
     file delete -force /tmp/sparkly
     file delete -force /tmp/library
-    set x
-} [list /tmp/lib/tcl[info tclversion] /lib/tcl[info tclversion] \
+    unset env(TCL_LIBRARY)
+    if {[info exists oldlibrary]} {
+	set env(TCL_LIBRARY) $oldlibrary
+	unset oldlibrary
+    }
+} -result [list /tmp/lib/tcl[info tclversion] /lib/tcl[info tclversion] \
         /tmp/library /library /tcl[info patchlevel]/library]
 
 test unixInit-2.10 {TclpInitLibraryPath: executable relative} -constraints {
 	unix stdio 
 } -setup {
+    unset -nocomplain oldlibrary
+    if {[info exists env(TCL_LIBRARY)]} {
+	set oldlibrary $env(TCL_LIBRARY)
+    }
+    set env(TCL_LIBRARY) [info library]
     set tmpDir [makeDirectory tmp]
     set sparklyDir [makeDirectory sparkly $tmpDir]
     set execPath [file join [makeDirectory bin $sparklyDir] tcltest]
@@ -308,7 +364,7 @@ test unixInit-2.10 {TclpInitLibraryPath: executable relative} -constraints {
     cd $libDir
 } -body {
     # Checking for Bug 832657
-    set x [lrange [getlibpath [file join .. bin tcltest]] 4 5]
+    set x [lrange [getlibpath [file join .. bin tcltest]] 3 4]
     foreach p $x {
 	lappend y [file normalize $p]
     }
@@ -329,6 +385,11 @@ test unixInit-2.10 {TclpInitLibraryPath: executable relative} -constraints {
     unset tmpDir
     removeDirectory tmp
     unset x p y
+    unset env(TCL_LIBRARY)
+    if {[info exists oldlibrary]} {
+	set env(TCL_LIBRARY) $oldlibrary
+	unset oldlibrary
+    }
 } -result [list [file join [temporaryDirectory] tmp sparkly library] \
 	[file join [temporaryDirectory] tmp library] ]