mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-23 12:48:40 -05:00
78 lines
3.0 KiB
Plaintext
78 lines
3.0 KiB
Plaintext
|
Copyright 2005 Vladimir Prus
|
||
|
|
Distributed under the Boost Software License, Version 1.0.
|
||
|
|
(See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
|
||
|
|
|
||
|
|
|
||
|
|
Summary
|
||
|
|
-------
|
||
|
|
|
||
|
|
We need a --build-dir option that users building from read-only
|
||
|
|
medium can use to force building to some other location. Pretty much
|
||
|
|
every project need this functionality, so it's desirable to have it
|
||
|
|
out-of-the box, without explicit setup.
|
||
|
|
|
||
|
|
Design
|
||
|
|
------
|
||
|
|
|
||
|
|
We can achieve the desired effect manually by adding something like this
|
||
|
|
to Jamroot:
|
||
|
|
|
||
|
|
project .... : build-dir [ my-rule-to-compute-build-dir ] ;
|
||
|
|
|
||
|
|
Where 'my-rule-to-compute-build-dir' would look at the --build-dir option.
|
||
|
|
|
||
|
|
We need to automate this, but essentially, --build-dir will only affect
|
||
|
|
the 'build-dir' attribute of Jamroots.
|
||
|
|
|
||
|
|
If Jamroot contains:
|
||
|
|
|
||
|
|
project foo ;
|
||
|
|
|
||
|
|
and --build-dir options' value if /tmp/build, then we'll act as if Jamroot
|
||
|
|
contained:
|
||
|
|
|
||
|
|
project foo : build-dir /tmp/build/foo ;
|
||
|
|
|
||
|
|
If the 'project' rule has explicit 'build-dir':
|
||
|
|
|
||
|
|
project foo : build-dir bin.v2 ;
|
||
|
|
|
||
|
|
then with the same value of --build-dir we'd act as if Jamroot contained:
|
||
|
|
|
||
|
|
project foo : build-dir /tmp/build/foo/bin.v2 ;
|
||
|
|
|
||
|
|
We can't drop "bin.v2" because it's quite possible that the name of build dir
|
||
|
|
have specific meaning. For example, it can be used to separate Boost.Build V1
|
||
|
|
and V2 build results.
|
||
|
|
|
||
|
|
The --build-dir option has no effect if Jamroot does not define any project id.
|
||
|
|
Doing otherwise can lead to nasty problems if we're building two distinct
|
||
|
|
projects (that is with two different Jamroot). They'll get the same build
|
||
|
|
directory. Most likely, user will see the "duplicate target" error, which is
|
||
|
|
generally confusing.
|
||
|
|
|
||
|
|
It is expected that any non-trivial project will have top-level "project"
|
||
|
|
invocation with non empty id, so the above limitation is not so drastic.
|
||
|
|
We'll emit a warning if Jamroot does not define project id, and --build-dir
|
||
|
|
is specified.
|
||
|
|
|
||
|
|
Here's the exact behavior of the --build-dir option. If we're loading a
|
||
|
|
Jamfile (either root or non-root), that declare some project id and some
|
||
|
|
build-dir attribute, the following table gives the value of build-dir
|
||
|
|
that will actually be used.
|
||
|
|
|
||
|
|
-------------------------------------------------------------------------------
|
||
|
|
Root? Id Build-dir attribute Resulting build dir
|
||
|
|
-------------------------------------------------------------------------------
|
||
|
|
yes none * --build-dir is ignored, with warning
|
||
|
|
yes 'foo' none /tmp/build/foo
|
||
|
|
yes 'foo' 'bin.v2' /tmp/build/foo/bin.v2
|
||
|
|
yes 'foo' '/tmp/bar' Error [1]
|
||
|
|
no * none --build-dir has no effect, inherited
|
||
|
|
build dir is used
|
||
|
|
no * non-empty Error [2]
|
||
|
|
-------------------------------------------------------------------------------
|
||
|
|
[1] -- not clear what to do
|
||
|
|
[2] -- can be made to work, but non-empty build-dir
|
||
|
|
attribute in non-root Jamfile does not make much sense even without --build-dir
|