Subject: Re: [Boost-build] Is it possible to remove dependencies?
From: Börje Granberg (borje.granberg_at_[hidden])
Date: 2010-04-13 11:39:02
Log.h is created though input from several source and header files in
the project and the output is put in a single file so that is why it
is big. But since the Log.h in recreated every time the build system
should not rebuild every other file in the project.
If it is impossible as you say I think I can solve it by using letting
the log framework go though the files before gcc does, some kind of
preprocessor so to say and become a 1-to-1 generator, but no sure how
>From every .cc or .hh the "log compiler" can create a header file with
some class definitions and implementation. There is a 1 to 1 relation
between these. (CC/HH -> log.HH) Other files in the project include
these log.HH files.
>From foo.cc there should first a foo.cc.log.hh and after that gcc
should go in and create the object file. Since bar.cc that includes
"foo.cc.log.hh" boost should also recompile this file.
This question is related to http://lists.boost.org/boost-build/2010/04/23344.php
2010/4/13 Konstantin Litvinenko <to.darkangel_at_[hidden]>:
> BÃ¶rje Granberg Ð¿Ð¸ÑÐµÑ:
>> The log framework in my project creates a quite big header file
>> (Log.h) that is included in every file in the project that uses
>> creates logs.
>> The tool that creates this header file parses every source file and
>> puts its output in log.h. If the log.h gets updated because foo.cc is
>> updated I don't want bar.cc to be recompiled.
>> The old make based build system uses a macro around the #include line
>> so that when makedep created the dependency files, an update of Log.h
>> does not create any dependencies at all. Note that all files that
>> needs to be rebuild will be rebuild anyway.
>> Does anyone know any way so solve this with boost build? Or do you
>> have any ideas to improve the creatation of Log.h?
> Â As I know it is impossible to do...
> Â Why log.h is big? I have never saw that logging can make any bloat...
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