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Postsdbo
PO
 

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    <p>As I understand it, your config library is shared over different projects and uses different defines for each project.</p> <p>It's not possible to overcome recompilation in that case, irrespective of boost build.or any other build system. In between compiles of the cpp files the preprocessed files <em>have</em> changed.</p> <p>If you want to avoid recompilation one option is to split of the config library into different libraries for each project, but depending on what <code>config</code> looks like, having a lot of code duplication is rarely desireable either...</p> <p>The only other option I can think of is reducing the amount of code that needs to be recompiled every time.</p> <p>e.g. you have a sourcefile <code>LargeFunction.cpp</code> with</p> <pre><code> #if CONFIG_DEFINE_1 void VeryLargeFunction() { ... } #elif CONFIG_DEFINE_2 void VeryLargeFunction() { ... } #endif </code></pre> <p>Split it into three files, one containing the VeryLargeFunction as defined for DEFINE_1, one as defined for DEFINE_2, and one which simply includes these two based on the values of the defines.</p> <pre><code> #if CONFIG_DEFINE_1 #include "definitionFileFor1" #elif CONFIG_DEFINE_2 #include "definitionFileFor2" #endif </code></pre> <p>This file still needs to be recompiled every time, but the object files which contain the 'real' code, will not.</p> <p>You'll effectively only relink existing object files on every compile, i.s.o. recompiling everything. </p> <p>The disadvantage is more maintenance though, and the different function definitions reside in different files, so the code becomes a bit harder to read.</p>
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    1. POBoost.Build conditional library compilation per-project
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    1. USPieter
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      1. VTUpMod
    1. COI suppose that a target (I assume target = .cpp + dependent .h + defines) should not be rebuilt if nothing of the dependency list is changed. Moreover there is a separate resulting object file per project built. Also I am using MS Visual Studio as an IDE with correcponding solution and it does not do redundant rebuilding.
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    2. COno, if .cpp + dependent.h + defines doesn't change, nothing should be rebuilt, from your "there's a separate version of config library per project." I got that the defines are different for each project...
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    3. COfor the record, I use Boost.Build too for various projects, but never had problems like that
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