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Comment:New TIP #549: Make configure --enable-64bit the default
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SHA3-256: 342fda5d8507fb5cd152d804869f7a6209a2c3a70355b2060b1f99527b787517
User & Date: jan.nijtmans 2019-06-07 16:53:09
Context
2019-06-07
17:04
Fix branch link check-in: cd6077e1ce user: jan.nijtmans tags: trunk
16:53
New TIP #549: Make configure --enable-64bit the default check-in: 342fda5d85 user: jan.nijtmans tags: trunk
2019-06-05
19:51
Formatting cleanup for TIP 461 check-in: 53528a425f user: dkf tags: trunk
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{"tip": {
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	"548":{"url":"./tip/548.md","keywords":"Tcl","created":"3-June-2019","post-history":"","state":"Draft","tcl-branch":"tip-548","tcl-version":"8.7","vote":"Pending","type":"Project","title":"# TIP 548:Deprecate Tcl\\_WinUtfToTChar() and Tcl\\_WinTCharToUtf() and provide more flexible replacement functions.","discussions-to":"Tcl Core list","author":["Jan Nijtmans <[email protected]>","Jan Nijtmans <[email protected]>"],"is-jest":false},
	"547":{"url":"./tip/547.md","keywords":"Tcl","created":"31-May-2019","post-history":"","state":"Draft","tcl-branch":"tip-547","tcl-version":"8.7","vote":"Pending","type":"Project","title":"# TIP 547: New encodings: UTF-16, UCS-2.","discussions-to":"Tcl Core list","author":["Jan Nijtmans <[email protected]>","Jan Nijtmans <[email protected]>"],"is-jest":false},
	"546":{"url":"./tip/546.md","keywords":"Tcl, traces","created":"20-May-2019","post-history":"","state":"Draft","vote":"Pending","tcl-version":"8.7","type":"Project","title":"# TIP 546: Typedefs to Support Source-Compatible Migration","author":["Don Porter <[email protected]>"],"is-jest":false},
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	"544":{"url":"./tip/544.md","keywords":"Tcl","created":"15-May-2019","post-history":"","state":"Final","tcl-branch":"tip-544","vote":"Done","tcl-version":"8.7","type":"Project","title":"# TIP 544: Export TclGetIntForIndex()","discussions-to":"Tcl Core list","author":["Jan Nijtmans <[email protected]>","Fran├žois Vogel <[email protected]>"],"is-jest":false},
	"543":{"url":"./tip/543.md","keywords":"Tcl, traces","created":"10-May-2019","post-history":"","state":"Draft","vote":"Pending","tcl-version":"9.0","type":"Project","title":"# TIP 543: Eliminate TCL\\_INTERP\\_DESTROYED flag value","author":["Don Porter <[email protected]>"],"is-jest":false},
	"542":{"url":"./tip/542.md","keywords":"Tcl","created":"10-May-2019","post-history":"","state":"Draft","tcl-branch":"utf-max","tcl-version":"8.7","vote":"Pending","type":"Project","title":"# TIP 542:Support for switchable (Androwish-compatible) Full Unicode support.","discussions-to":"Tcl Core list","author":["Jan Nijtmans <[email protected]>","Jan Nijtmans <[email protected]>"],"is-jest":false},
................................................................................
	"5":{"url":"./tip/5.md","created":"17-Oct-2000","post-history":"","state":"Final","vote":"Done","tcl-version":"8.4","type":"Project","title":"# TIP 5: Make TkClassProcs and TkSetClassProcs Public and Extensible","author":["Eric Melski <[email protected]>"],"is-jest":false},
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	"@min": 0,
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<th>Type</th>
<th>Tcl Version</th>
<th>Status</th>
<th>Title</th>
<th>Impl.</th>
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<tr class='state-draft type-project version-87'>
<td valign='top'><a href='./tip/548.md'>548</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.7</td>
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<td valign='top' ><a href='./tip/548.md'>Deprecate Tcl\_WinUtfToTChar() and Tcl\_WinTCharToUtf() and provide more flexible replacement functions.</a></td>
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<td valign='top'><a href='./tip/549.md'>549</a></td>
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<td valign='top' ><a href='./tip/549.md'>Make configure --enable-64bit the default</a></td>
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<td valign='top' ><a href='./tip/548.md'>Deprecate Tcl\_WinUtfToTChar() and Tcl\_WinTCharToUtf() and provide more flexible replacement functions.</a></td>
<td valign='top'><a href='/tcl/timeline?r=tip-548'>Link</a></td>

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# TIP 549: Make configure --enable-64bit the default
	Author:         Jan Nijtmans <[email protected]>
	Author:         Jan Nijtmans <[email protected]>
	State:          Draft
	Type:           Project
	Vote:           Pending
	Created:        7-June-2019
	Post-History:   
	Discussions-To: Tcl Core list
	Keywords:       Tcl
	Tcl-Version:    8.7
	Tcl-Branch:     tip-548
-----

# Abstract

This TIP proposes to make `--enable-64bit` the default

# Rationale

Since 64-bit systems are gradually taking over 32-bit systems, it makes sense to change the default from 32-bit to 64-bit.

# Specification

This document proposes:

 * If `configure` is run without `--enable-64bit` or `--disable-64bit`, then the script behaves
   as if --enable-64bit is given.

# Compatibility

If you want a 32-bit build, you should explicitly specify `--disable-64bit` with `configure`.
That will work with any Tcl version, older ones too.

# Reference Implementation

A reference implementation is available in  the **tip-549** branch.
<https://core.tcl.tk/tcl/timeline?r=tip-549>

# Copyright

This document has been placed in the public domain.