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Tcl/Tk 8.5.16

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Tcl/Tk 8.5.16 Release Announcement
August 25, 2014

The Tcl Core Team is pleased to announce the 8.5.16 releases of the Tcl
dynamic language and the Tk toolkit. This is the sixteenth patch release
of Tcl/Tk 8.5. More details can be found below. We would like to
express our gratitude to all those who submit bug reports and patches.
This information is invaluable in enabling us to identify and eliminate
problems in the core.

Where to get the new releases:

Tcl/Tk 8.5.16 sources are freely available as open source from the
Tcl Developer Xchange web site at:

This web page also contains additional information about the releases,
including new features and notes about installing and compiling the
releases. Sources are always available from the Tcl SourceForge
project's file distribution area:

Binaries for most major platforms will be available from:

For additional information:

Please visit the Tcl Developer Xchange web site:

This site contains a variety of information about Tcl/Tk in general, the
core Tcl and Tk distributions, Tcl development tools, and much more.

Summary of Changes since Tcl/Tk 8.5.15:

The following were the main changes in Tcl/Tk 8.5.15. A complete list
can be found in the changes file at the root of the source tree. The
more complete Timelines of all changes are online

This is a patch release, so it primarily includes bug fixes and corrections
to erratic behavior. Below are only the most notable changes.

* Many fixes and improvements to Tk on OSX Cocoa and Retina displays.
Build support for Xcode 5.1+.

* Update to Unicode 7.0.

* Enhancement: %E%G%X support in [scan].

* Enhancement: PPM [$image write] now permits max value of 65535.

* Fix: bad components in [$image write] files with transparency.

* Fix: [menu] event race that made popup vanish immediately.

* Fix: Win: avoid stall in async socket connect.

* Fix: Win: readable event on async connect failure.

* Fix: combobox invalid state from interactive selection.

* Fix: Maintain validity in use of bytearray optimizations.

* Workaround: TCL_TEMPLOAD_NO_UNLINK for [load] from kit troubles.

* Fixed crashes in...
- [dict] bytecode compilers
- trace-induced race deleting a command and its import
- recursive reflected channel operations
- suicidal [close] or [interp delete] in reflected channel ops
- unstacking stacked channels in mid-operation.
- multi-threaded reflected channel map teardown

* Revised refcount usage for Tcl_SetVar*(..,TCL_APPEND_VALUE)

* Stop eof & blocked state leakage through stacked channels
*** POTENTIAL INCOMPATIBILITY for channel drivers ***

* Tcl_Channel is no longer Tcl_Preserve()-able.

* Fix: channel background flush workaround broken select() syscalls.

* Fix: Tcl_CreateNamespace(..., "foo::", ...) deletion failures.

* Fix: many [info frame] line number reports.

* Fix: Win: avoid serial channel double open; Bluetooth woes.

* Fix: Win: no \ in normalized extended paths.

* Significant refactoring in I/O core functions.

* Win: update sockets implementation to use Winsock 2.2 .

* Platform support improvements: Win 8.1, FreeBSD 10.0, HP-UX.

* Fix: X: handling of fontconfig dependency in Tk builds.

* New package releases:
http 2.7.13: Accept upper case schemes in URLs
tcltest 2.3.7: cleanup runs before output comparisons
platform 1.0.13: Update macosx-* variant compatibilities