SCons User Guide 1.2.0.d20100117 | ||
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If you need to delete a file, then the Delete factory can be used in much the same way as the Copy factory. For example, if we want to make sure that the temporary file in our last example doesn't exist before we copy to it, we could add Delete to the beginning of the command list:
Command("file.out", "file.in", [ Delete("tempfile"), Copy("tempfile", "$SOURCE"), "modify tempfile", Copy("$TARGET", "tempfile"), ]) |
Which then executes as follows:
% scons -Q Delete("tempfile") Copy("tempfile", "file.in") modify tempfile Copy("file.out", "tempfile") |
Of course, like all of these Action
factories,
the Delete factory also expands
$TARGET
and $SOURCE
variables appropriately.
For example:
Command("file.out", "file.in", [ Delete("$TARGET"), Copy("$TARGET", "$SOURCE") ]) |
Executes as:
% scons -Q Delete("file.out") Copy("file.out", "file.in") |
Note, however, that you typically don't need to call the Delete factory explicitly in this way; by default, SCons deletes its target(s) for you before executing any action.
One word of caution about using the Delete factory:
it has the same variable expansions available
as any other factory, including the $SOURCE
variable.
Specifying Delete("$SOURCE")
is not something you usually want to do!
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