Release Notes

Tcl/Tk 8.6.8 Release Announcement December 22, 2017

The Tcl Core Team is pleased to announce the 8.6.8 releases of the Tcl dynamic language and the Tk toolkit. This is the eighth patch release of Tcl/Tk 8.6. 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 8.6.8 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 are 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 8.6.7:

This is a patch release, so it primarily includes bug fixes and corrections to erratic behavior. Highlighted changes are noted below. The changes file at the root of the source tree contains a more complete list. The Timelines of all changes are online.

  • [TIP 477] nmake build system reform

  • Support for backrefs in [array names -regexp]

  • [info * methods] includes mixins (fellows)

  • [package prefer stable] failing case

  • More robust [load] for ReactOS

  • Fix crashes or hangs in…

    • traced namespace teardown
    • method cloning, oo-15.15
    • hash table overflow 32 bits
    • enemble configure -map $x -subcommands $x
    • memory exhaustion, imgPhoto-18.*
    • photo image copy to self
    • [scale] set with a bignum value
  • Fix memory leaks in…

    • [text] B-tree operations
    • photo image operations
    • Tk platform code for macOS 10.13
  • Canvas closed polylines fully honor -joinstyle

  • Fix coords rounding when drawing canvas items

  • Linux fontchooser sync with available fonts

  • Canvas rotated text overlap detection

  • Display of Long non-wrapped lines in text

  • Drop support for macOS 10.5

  • Tk improvements on macOS…

    • Implement [wm_iconphoto]
    • colorspace improvement
    • scrolling issues
    • clipping regions in scrolling and drawing
    • redraw artifacts
    • responsive menu bar for command line apps
    • support png from mac screenshots
    • file selector “all types” setting
    • fixes for [raise]
    • support of menu -postcommand
    • enable custom icon display
    • fix bind failures
    • make [tk busy -cursor] a silent no-op
    • [wm withdraw] on Window and Dock menus
  • Updated bundled packages

    • Itcl 4.1.1 (incompatible with Itk 4.0, get Itk 4.1)
    • sqlite3 3.21.0
    • Thread 2.8.2
    • tdbc* 1.0.6
    • http 2.8.12

Tcl Core Team and Maintainers Don Porter, Tcl Core Release Manager