1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright (c) 2001 - 2016 The SCons Foundation
This file is processed by the bin/SConsDoc.py module.
See its __doc__ string for a discussion of the format.
-->
<!DOCTYPE sconsdoc [
<!ENTITY % scons SYSTEM '../../../doc/scons.mod'>
%scons;
<!ENTITY % builders-mod SYSTEM '../../../doc/generated/builders.mod'>
%builders-mod;
<!ENTITY % functions-mod SYSTEM '../../../doc/generated/functions.mod'>
%functions-mod;
<!ENTITY % tools-mod SYSTEM '../../../doc/generated/tools.mod'>
%tools-mod;
<!ENTITY % variables-mod SYSTEM '../../../doc/generated/variables.mod'>
%variables-mod;
]>
<sconsdoc xmlns="http://www.scons.org/dbxsd/v1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.scons.org/dbxsd/v1.0 http://www.scons.org/dbxsd/v1.0/scons.xsd">
<cvar name="IMPLICIT_COMMAND_DEPENDENCIES">
<summary>
<para>
Controls whether or not SCons will
add implicit dependencies for the commands
executed to build targets.
</para>
<para>
By default, SCons will add
to each target
an implicit dependency on the command
represented by the first argument on any
command line it executes.
The specific file for the dependency is
found by searching the
<varname>PATH</varname>
variable in the
<varname>ENV</varname>
environment used to execute the command.
</para>
<para>
If the construction variable
&cv-IMPLICIT_COMMAND_DEPENDENCIES;
is set to a false value
(<literal>None</literal>,
<literal>False</literal>,
<literal>0</literal>,
etc.),
then the implicit dependency will
not be added to the targets
built with that construction environment.
</para>
<example_commands>
env = Environment(IMPLICIT_COMMAND_DEPENDENCIES = 0)
</example_commands>
</summary>
</cvar>
<cvar name="PRINT_CMD_LINE_FUNC">
<summary>
<para>
A Python function used to print the command lines as they are executed
(assuming command printing is not disabled by the
<option>-q</option>
or
<option>-s</option>
options or their equivalents).
The function should take four arguments:
<varname>s</varname>,
the command being executed (a string),
<varname>target</varname>,
the target being built (file node, list, or string name(s)),
<varname>source</varname>,
the source(s) used (file node, list, or string name(s)), and
<varname>env</varname>,
the environment being used.
</para>
<para>
The function must do the printing itself. The default implementation,
used if this variable is not set or is None, is:
</para>
<example_commands>
def print_cmd_line(s, target, source, env):
sys.stdout.write(s + "\n")
</example_commands>
<para>
Here's an example of a more interesting function:
</para>
<example_commands>
def print_cmd_line(s, target, source, env):
sys.stdout.write("Building %s -> %s...\n" %
(' and '.join([str(x) for x in source]),
' and '.join([str(x) for x in target])))
env=Environment(PRINT_CMD_LINE_FUNC=print_cmd_line)
env.Program('foo', 'foo.c')
</example_commands>
<para>
This just prints "Building <varname>targetname</varname> from <varname>sourcename</varname>..." instead
of the actual commands.
Such a function could also log the actual commands to a log file,
for example.
</para>
</summary>
</cvar>
<cvar name="SPAWN">
<summary>
<para>
A command interpreter function that will be called to execute command line
strings. The function must expect the following arguments:
</para>
<example_commands>
def spawn(shell, escape, cmd, args, env):
</example_commands>
<para>
<varname>sh</varname>
is a string naming the shell program to use.
<varname>escape</varname>
is a function that can be called to escape shell special characters in
the command line.
<varname>cmd</varname>
is the path to the command to be executed.
<varname>args</varname>
is the arguments to the command.
<varname>env</varname>
is a dictionary of the environment variables
in which the command should be executed.
</para>
</summary>
</cvar>
</sconsdoc>
|
