77 lines
2.3 KiB
Plaintext
77 lines
2.3 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)
|
|
|
|
|
|
Hi,
|
|
recently, we had a couple of problems caused by using relative file paths, and
|
|
I'd like to discuss what to do.
|
|
|
|
Let's use the case from CÊdric. Simplified version is:
|
|
|
|
exe a : a.cpp dir1/qt_file.h ;
|
|
exe b : a.cpp dir2/qt_file.h ;
|
|
|
|
Both exes have the same source cpp file but different *.h files -- which are
|
|
processed by Qt tools. V2 currently strips directory name from all targets,
|
|
so it tries to
|
|
|
|
- create "bin/mvsc/debug/moc_qt_file.cpp" from dir1/qt_file.h
|
|
- create "bin/msvc/debug/moc_qt_file.cpp" from dir2/qt_file.h
|
|
|
|
There are two solutions that I see:
|
|
|
|
1. Rewrite the code like:
|
|
|
|
lib aux : a.cpp
|
|
exe a : aux dir1/qt_file.h : <location-prefix>a ;
|
|
exe b : aux dir2/qt_file.h : <location-prefix>b ;
|
|
|
|
This way, two version of moc_qt_file.cpp will be generated to different
|
|
places.
|
|
|
|
2. Rewrite the code like:
|
|
|
|
obj a_moc : dir1/qt_file.h : <library>/qt//qt ;
|
|
exe a : a.cpp a_moc ;
|
|
obj b_moc : dir2/qt_file.h : <library>/qt//qt ;
|
|
exe b : a.cpp b_moc ;
|
|
|
|
Explicitly changing name for the problematic files.
|
|
|
|
3. Generally change V2 so that directory part of source is preserved. This
|
|
will generate targets:
|
|
"bin/msvc/debug/dir1/moc_qt_file.cpp" and
|
|
"bin/msvc/debug/dir2/moc_qt_file.cpp". No problems.
|
|
|
|
However, there are some additional questions:
|
|
|
|
- What if source has absolute file name?
|
|
- What if source is "../../include/qt_file.h"?
|
|
|
|
We can ignore directory names in those cases (i.e. use the current
|
|
behaviour) but that would be a bit inconsistent.
|
|
|
|
Any opinions?
|
|
|
|
Pedro Ferreira:
|
|
|
|
I think this is a corner case and BB should not try to solve everything
|
|
automatically - otherwise it will become really complex.
|
|
I don't see a problem in requiring the user to help the build system by
|
|
using solutions 1 or 2.
|
|
Of course, the better the error reporting, the easier it will be to
|
|
find the cause and the cure of the problem.
|
|
|
|
TEMPLIE Cedric:
|
|
|
|
I agree with Pedro. Solution 1 or 2 is the best way to deal with this
|
|
problem. Of course I have a preference for the solution 1, but the
|
|
solution 2 has the advantage to work without any modification...
|
|
|
|
Toon Knapen:
|
|
|
|
I agree.
|
|
|
|
|