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author MrJuneJune <me@mrjunejune.com>
date Mon, 19 Jan 2026 18:56:54 -0800
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1 Maintaining Autosetup in the SQLite Tree
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2 ========================================================================
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3
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4 This document provides some tips and reminders for the SQLite
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5 developers regarding using and maintaining the [Autosetup][]-based
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6 build infrastructure. It is not an [Autosetup][] reference.
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7
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8 **Table of Contents**:
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9
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10 - [Autosetup API Reference](#apiref)
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11 - [API Tips](#apitips)
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12 - [Ensuring TCL Compatibility](#tclcompat)
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13 - [Design Conventions](#conventions)
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14 - Symbolic Names of Feature Flags
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15 - Do Not Update Global Shared State
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16 - [Updating Autosetup](#updating)
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17 - ***[Patching Autosetup for Project-local changes](#patching)***
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18 - [Branch-specific Customization](#branch-customization)
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19
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20
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21 ------------------------------------------------------------------------
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22
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23 <a name="apiref"></a>
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24 Autosetup API Reference
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25 ========================================================================
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26
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27 The Autosetup API is quite extensive and can be read either in
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28 the [files in the `autosetup` dir](/dir/autosetup) or using:
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29
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30 >
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31 ```
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32 $ ./configure --reference | less
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33 ```
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34
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35 That will include any docs from any TCL files in the `./autosetup` dir
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36 which contain certain (simple) markup defined by autosetup.
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37
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38 This project's own configuration-related TCL code is spread across the
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39 following files:
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40
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41 - [proj.tcl][]: project-agnostic utility code for autosetup-driven
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42 projects. This file is designed to be shared between this project,
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43 other projects managed under the SQLite/Hwaci umbrella
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44 (e.g. Fossil), and personal projects of SQLite's developers. It is
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45 essentially an amalgamation of a decade's worth of autosetup-related
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46 utility code.
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47 - [sqlite-config.tcl][]: utility code which is too project-specific
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48 for `proj.tcl`. We split this out of `auto.def` so that it can be
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49 used by both `auto.def` and...
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50 - [auto.def][]: the primary driver for the `./configure` process.
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51 When we talk about "the configure script," we're technically
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52 referring to this file, though it actually contains very little
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53 of the TCL code.
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54 - [autoconf/auto.def][]: the main driver script for the "autoconf"
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55 bundle's configure script. It is essentially a slightly trimmed-down
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56 version of the main `auto.def` file. The `autoconf` dir was ported
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57 from the Autotools to Autosetup in the 3.49.0 dev cycle but retains
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58 the "autoconf" name to minimize downstream disruption.
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59
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60
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61 <a name="apitips"></a>
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62 Autosetup API Tips
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63 ========================================================================
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64
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65 This section briefly covers only APIs which are frequently useful in
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66 day-to-day maintenance and might not be immediately recognized as such
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67 from a casual perusal of the relevant TCL files. The complete docs of
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68 those with `proj-` prefix can be found in [proj.tcl][] and those with
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69 an `sqlite-` prefix are in [sqlite-config.tcl][]. The others are part
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70 of Autosetup's core packages and are scattered around [the TCL files
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71 in ./autosetup](/dir/autosetup).
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72
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73 In (mostly) alphabetical order:
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74
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75 - **`file-isexec filename`**\
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76 Should be used in place of `[file executable]`, as it will also
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77 check for `${filename}.exe` on Windows platforms. However, on such
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78 platforms it also assumes that _any_ existing file is executable.
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79
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80 - **`get-env VAR ?default?`**\
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81 Will fetch an "environment variable" from the first of either: (1) a
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82 KEY=VALUE passed to the configure script or (2) the system's
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83 environment variables. Not to be confused with `getenv`, which only
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84 does the latter and is rarely, if ever, useful in this tree.
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85 - **`proj-get-env VAR ?default?`**\
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86 Works like `get-env` but will, if that function finds no match,
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87 look for a file named `./.env-$VAR` and, if found, return its
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88 trimmed contents. This can be used, e.g., to set a developer's
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89 local preferences for the default `CFLAGS`.\
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90 Tip: adding `-O0` to `.env-CFLAGS` reduces rebuild times
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91 considerably at the cost of performance in `make devtest` and the
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92 like.
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93
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94 - **`proj-fatal msg`**\
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95 Emits `$msg` to stderr and exits with non-zero. Its differences from
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96 autosetup's `user-error` are purely cosmetic.
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97
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98 - **`proj-if-opt-truthy flag thenScript ?elseScript?`**\
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99 Evals `thenScript` if the given `--flag` is truthy, else it
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100 evals the optional `elseScript`.
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101
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102 - **`proj-indented-notice ?-error? ?-notice? msg`**\
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103 Breaks its `msg` argument into lines, trims them, and emits them
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104 with consistent indentation. Exactly how it emits depends on the
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105 flags passed to it (or not), as covered in its docs. This will stick
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106 out starkly from normal output and is intended to be used only for
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107 important notices.
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108
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109 - **`proj-opt-truthy flag`**\
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110 Returns 1 if `--flag`'s value is "truthy," i.e. one of (1, on,
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111 enabled, yes, true).
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112
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113 - **`proj-opt-was-provided FLAG`**\
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114 Returns 1 if `--FLAG` was explicitly provided to configure,
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115 else 0. This distinction can be used to determine, e.g., whether
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116 `--with-readline` was provided or whether we're searching for
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117 readline by default. In the former case, failure to find it should
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118 be treated as fatal, where in the latter case it's not.\
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119 Unlike most functions which deal with `--flags`, this one does not
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120 validate that `$FLAG` is a registered flag so will not fail fatally
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121 if `$FLAG` is not registered as an Autosetup option.
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122
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123 - **`proj-val-truthy value`**\
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124 Returns 1 if `$value` is "truthy," See `proj-opt-truthy` for the definition
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125 of "truthy."
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126
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127 - **`proj-warn msg`**\
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128 Emits `$msg` to stderr. Closely-related is autosetup's `user-notice`
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129 (described below).
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130
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131 - **`sqlite-add-feature-flag ?-shell? FLAG...`**\
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132 Adds the given feature flag to the CFLAGS which are specific to
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133 building libsqlite3. It's intended to be passed one or more
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134 `-DSQLITE_ENABLE_...`, or similar, flags. If the `-shell` flag is
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135 used then it also passes its arguments to
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136 `sqlite-add-shell-opt`. This is a no-op if `FLAG` is not provided or
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137 is empty.
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138
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139 - **`sqlite-add-shell-opt FLAG...`**\
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140 The shell-specific counterpart of `sqlite-add-feature-flag` which
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141 only adds the given flag(s) to the CLI-shell-specific CFLAGS.
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142
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143 - **`sqlite-configure BUILD-NAME {script}`**\
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144 This is where all configure `--flags` are defined for all known
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145 build modes ("canonical" or "autoconf"). After processing all flags,
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146 this function runs `$script`, which contains the build-mode-specific
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147 configuration bits, and then runs any finalization bits which are
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148 common to all build modes. The `auto.def` files are intended to contain
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149 exactly two commands:
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150 `use sqlite-config; sqlite-configure BUILD-NAME {script}`
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151
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152 - **`user-notice msg`**\
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153 Queues `$msg` to be sent to stderr, but does not emit it until
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154 either `show-notices` is called or the next time autosetup would
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155 output something (it internally calls `show-notices`). This can be
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156 used to generate warnings between a "checking for..." message and
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157 its resulting "yes/no/whatever" message in such a way as to not
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158 spoil the layout of such messages.
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159
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160
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161 <a name="tclcompat"></a>
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162 Ensuring TCL Compatibility
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163 ========================================================================
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164
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165 One of the significant benefits of using Autosetup is that (A) this
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166 project uses many TCL scripts in the build process and (B) Autosetup
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167 comes with a TCL interpreter named [JimTCL][].
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168
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169 It is important that any TCL files used by the configure process and
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170 makefiles remain compatible with both [JimTCL][] and the canonical
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171 TCL. Though JimTCL has outstanding compatibility with canonical TCL,
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172 it does have a few corners with incompatibilities, e.g. regular
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173 expressions. If a script runs in JimTCL without using any
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174 JimTCL-specific features, then it's a certainty that it will run in
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175 canonical TCL as well. The opposite, however, is not _always_ the
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176 case.
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177
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178 When [`./configure`](/file/configure) is run, it goes through a
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179 bootstrapping process to find a suitable TCL with which to run the
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180 autosetup framework. The first step involves [finding or building a
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181 TCL shell](/file/autosetup/autosetup-find-tclsh). That will first
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182 search for an available `tclsh` (under several common names,
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183 e.g. `tclsh8.6`) before falling back to compiling the copy of
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184 `jimsh0.c` included in the source tree. i.e. it will prefer to use a
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185 system-installed TCL for running the configure script. Once it finds
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186 (or builds) a TCL shell, it then runs [a sanity test to ensure that
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187 the shell is suitable](/file/autosetup/autosetup-test-tclsh) before
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188 using it to run the main autosetup app.
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189
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190 There are two simple ways to ensure that running of the configure
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191 process uses JimTCL instead of the canonical `tclsh`, and either
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192 approach provides equally high assurances about configure script
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193 compatibility across TCL implementations:
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194
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195 1. Build on a system with no `tclsh` installed in the `$PATH`. In that
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196 case, the configure process will fall back to building the in-tree
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197 copy of JimTCL.
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198
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199 2. Manually build `./jimsh0` in the top of the checkout with:\
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200 `cc -o jimsh0 autosetup/jimsh0.c`\
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201 With that in place, the configure script will prefer to use that
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202 before looking for a system-level `tclsh`. Be aware, though, that
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203 `make distclean` will remove that file.
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204
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205 **Note that `./jimsh0` is distinctly different from the `./jimsh`**
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206 which gets built for code-generation purposes. The latter requires
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207 non-default build flags to enable features which are
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208 platform-dependent, most notably to make its `[file normalize]` work.
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209 This means, for example, that the configure script and its utility
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210 APIs must not use `[file normalize]`, but autosetup provides a
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211 TCL-only implementation of `[file-normalize]` (note the dash) for
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212 portable use in the configure script. Contrariwise, code-generation
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213 scripts invoked via `make` may use `[file normalize]`, as they'll use
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214 `./jimsh` or `tclsh` instead of `./jimsh0`.
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215
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216
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217 Known TCL Incompatibilities
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218 ------------------------------------------------------------------------
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219
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220 A summary of known incompatibilities in JimTCL
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221
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222 - **CRNL line endings**: prior to 2025-02-05 `fconfigure -translation ...`
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223 was a no-op in JimTCL, and it emits CRNL line endings by default on
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224 Windows. Since then, it supports `-translation binary`, which is
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225 close enough to `-translation lf` for our purposes. When working
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226 with files using the `open` command, it is important to use mode
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227 `"rb"` or `"wb"`, as appropriate, so that the output does not get
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228 CRNL-mangled on Windows.
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229
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230 - **`file copy`** does not support multiple source files. See
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231 [](/info/61f18c96183867fe) for a workaround.
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232
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233 - **Regular expressions**:
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234
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235 - Patterns treat `\nnn` octal values as back-references (which it
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236 does not support). Those can be reformulated as demonstrated in
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237 [](/info/aeac23359bb681c0).
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238
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239 - `regsub` does not support the `\y` flag. A workaround is demonstrated
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240 in [](/info/c2e5dd791cce3ec4).
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241
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242
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243 <a name="conventions"></a>
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244 Design Conventions
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245 ========================================================================
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246
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247 This section describes the motivations for the most glaring of the
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248 build's design decisions, in particular how they deviate from
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249 historical, or even widely-conventional, practices.
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250
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251 Symbolic Names of Feature Flags
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252 ------------------------------------------------------------------------
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253
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254 Historically, the project's makefile has exclusively used
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255 `UPPER_UNDERSCORE` form for makefile variables. This build, however,
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256 primarily uses `X.y` format, where `X` is often a category label,
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257 e.g. `CFLAGS`, and `y` is the specific instance of that category,
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258 e.g. `CFLAGS.readline`.
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259
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260 When the configure script exports flags for consumption by filtered
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261 files, e.g. [Makefile.in][] and the generated
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262 `sqlite_cfg.h`, it does so in the more conventional `X_Y` form because
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263 those flags get exported as as C `#define`s to `sqlite_cfg.h`, where
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264 dots are not permitted.
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265
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266 The `X.y` convention is used in the makefiles primarily because the
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267 person who did the initial port finds that considerably easier on the
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268 eyes and fingers. In practice, the `X_Y` form of such exports is used
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269 exactly once in [Makefile.in][], where it's translated from `@X_Y@`
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270 into into `X.y` form for consumption by [Makefile.in][] and
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271 [main.mk][]. For example:
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272
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273 >
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274 ```
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275 LDFLAGS.shobj = @SHOBJ_LDFLAGS@
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276 LDFLAGS.zlib = @LDFLAGS_ZLIB@
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277 LDFLAGS.math = @LDFLAGS_MATH@
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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278 ```
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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279
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280 (That first one is defined by autosetup, and thus applies "LDFLAGS" as
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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diff changeset
281 the suffix rather than the prefix. Which is more legible is a matter
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
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diff changeset
282 of taste, for which there is no accounting.)
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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283
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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284
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285 Do Not Update Global Shared State
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286 ------------------------------------------------------------------------
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287
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288 In both the legacy Autotools-driven build and common Autosetup usage,
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289 feature tests performed by the configure script may amend global flags
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290 such as `LIBS`, `LDFLAGS`, and `CFLAGS`[^as-cflags]. That's
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291 appropriate for a makefile which builds a single deliverable, but less
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292 so for makefiles which produce multiple deliverables. Drawbacks of
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
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293 that approach include:
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294
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295 - It's unlikely that every single deliverable will require the same
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296 core set of those flags.
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297 - It can be difficult to determine the origin of any given change to
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298 that global state because those changes are hidden behind voodoo
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299 performed outside the immediate visibility of the configure script's
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300 maintainer.
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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301 - It can force the maintainers of the configure script to place tests
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302 in a specific order so that the resulting flags get applied at
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303 the correct time and/or in the correct order.\
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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304 (A real-life example: before the approach described below was taken
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305 to collecting build-time flags, the test for `-rpath` had to come
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306 _after_ the test for zlib because the results of the `-rpath` test
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307 implicitly modified global state which broke the zlib feature
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308 test. Because the feature tests no longer (intentionally) modify
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309 shared global state, that is not an issue.)
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310
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311 In this build, cases where feature tests modify global state in such a
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312 way that it may impact later feature tests are either (A) very
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313 intentionally defined to do so (e.g. the `--with-wasi-sdk` flag has
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314 invasive side-effects) or (B) are oversights (i.e. bugs).
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315
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316 This tree's [configure script][auto.def], [utility APIs][proj.tcl],
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317 [Makefile.in][], and [main.mk][] therefore strive to separate the
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318 results of any given feature test into its own well-defined
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319 variables. For example:
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320
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321 - The linker flags for zlib are exported from the configure script as
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322 `LDFLAGS_ZLIB`, which [Makefile.in][] and [main.mk][] then expose as
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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323 `LDFLAGS.zlib`.
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324 - `CFLAGS_READLINE` (a.k.a. `CFLAGS.readline`) contains the `CFLAGS`
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325 needed for including `libreadline`, `libedit`, or `linenoise`, and
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326 `LDFLAGS_READLINE` (a.k.a. `LDFLAGS.readline`) is its link-time
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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327 counterpart.
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328
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329 It is then up to the Makefile to apply and order the flags however is
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330 appropriate.
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331
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332 At the end of the configure script, the global `CFLAGS` _ideally_
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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diff changeset
333 holds only flags which are either relevant to all targets or, failing
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
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diff changeset
334 that, will have no unintended side-effects on any targets. That said:
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
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335 clients frequently pass custom `CFLAGS` to `./configure` or `make` to
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336 set library-level feature toggles, e.g. `-DSQLITE_OMIT_FOO`, in which
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parents:
diff changeset
337 case there is no practical way to avoid "polluting" the builds of
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MrJuneJune <me@mrjunejune.com>
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diff changeset
338 arbitrary makefile targets with those. _C'est la vie._
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339
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340
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341 [^as-cflags]: But see this article for a detailed discussion of how
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342 autosetup currently deals specifically with CFLAGS:
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343 <https://msteveb.github.io/autosetup/articles/handling-cflags/>
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344
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345
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diff changeset
346 <a name="updating"></a>
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347 Updating Autosetup
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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diff changeset
348 ========================================================================
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349
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parents:
diff changeset
350 Updating autosetup is, more often than not, painless. It requires having
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diff changeset
351 a checked-out copy of [the autosetup git repository][autosetup-git]:
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352
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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353 >
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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diff changeset
354 ```
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355 $ git clone https://github.com/msteveb/autosetup
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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diff changeset
356 $ cd autosetup
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357 # Or, if it's already checked out:
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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358 $ git pull
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
359 ```
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
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diff changeset
360
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
361 Then, from the top-most directory of an SQLite checkout:
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
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diff changeset
362
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
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diff changeset
363 >
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
364 ```
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
365 $ /path/to/autosetup-checkout/autosetup --install .
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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diff changeset
366 $ fossil status # show the modified files
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
367 ```
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
368
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
369 Unless the upgrade made any incompatible changes (which is exceedingly
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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diff changeset
370 rare), that's all there is to it. After that's done, **apply a patch
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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diff changeset
371 for the change described in the following section**, test the
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
372 configure process, and check it in.
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
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diff changeset
373
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
374 <a name="patching"></a>
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diff changeset
375 Patching Autosetup for Project-local Changes
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
376 ------------------------------------------------------------------------
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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diff changeset
377
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
378 Autosetup reserves the flag name **`--debug`** for its own purposes,
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
379 and its own special handling of `--enable-...` flags makes `--debug`
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
380 an alias for `--enable-debug`. As this project has a long history of
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
381 using `--enable-debug`, we patch autosetup to use the name
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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diff changeset
382 `--autosetup-debug` in place of `--debug`. That requires (as of this
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
383 writing) four small edits in
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
384 [/autosetup/autosetup](/file/autosetup/autosetup), as demonstrated in
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
385 [check-in 3296c8d3](/info/3296c8d3).
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
386
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
387 If autosetup is upgraded and this patch is _not_ applied the invoking
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
388 `./configure` will fail loudly because of the declaration of the
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
389 `debug` flag in `auto.def` - duplicated flags are not permitted.
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
390
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
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parents:
diff changeset
391 <a name="branch-customization"></a>
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
392 Branch-specific Customization
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
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diff changeset
393 ========================================================================
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diff changeset
394
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diff changeset
395 Certain vendor-specific branches require slight configure script
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
396 customization. Rather than editing `sqlite-config.tcl` for this,
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
397 which frequently leads to merge conflicts, the following approach
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
398 is recommended:
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
399
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
400 In the vendor-specific branch, create a file named
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
401 `autosetup/sqlite-custom.tcl`.
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
402
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
403 That file should contain the following content...
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
404
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
405 If flag customization is required, add:
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
406
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
407 >
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
408 ```
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
409 proc sqlite-custom-flags {} {
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
410 # If any existing --flags require different default values
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
411 # then call:
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
412 options-defaults {
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
413 flag-name new-default-value
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
414 ...
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
415 }
589bab390fb4 [ThirdParty] Added sqlite3 to the third_party.
MrJuneJune <me@mrjunejune.com>
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416 # ^^^ That will replace the default value but will not update
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417 # the --help text, which may lead to some confusion:
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418 # https://github.com/msteveb/autosetup/issues/77
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419
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420 return {
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421 {*} {
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422 new-flag-name => {Help text}
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423 ...
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424 }
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425 }; #see below
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426 }
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427 ```
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428
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429 That function must return either an empty string or a list in the form
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430 used internally by [sqlite-config.tcl][]'s `sqlite-configure`.
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431
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432 Next, define:
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433
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434 >
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435 ```
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436 proc sqlite-custom-handle-flags {} {
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437 ... do any custom flag handling here ...
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438 }
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439 ```
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440
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441 That function, if defined, will be called relatively late in the
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442 configure process, before any filtered files are generated but after
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443 all other significant processing.
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444
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445
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446 [Autosetup]: https://msteveb.github.io/autosetup/
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447 [auto.def]: /file/auto.def
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448 [autoconf/auto.def]: /file/autoconf/auto.def
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449 [autosetup-git]: https://github.com/msteveb/autosetup
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450 [proj.tcl]: /file/autosetup/proj.tcl
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451 [sqlite-config.tcl]: /file/autosetup/sqlite-config.tcl
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452 [Makefile.in]: /file/Makefile.in
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453 [main.mk]: /file/main.mk
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454 [JimTCL]: https://jim.tcl.tk