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POBoost.Build conditional library compilation per-project
 

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    <p>I have C++ project that are built using Boost.Build. The project consists of 3 subprojects.</p> <pre> . [root] \-- source \-- common \-- config \-- config.cpp \-- project_1 \-- Jamfile.jam \-- project_2 \-- Jamfile.jam \-- project_3 \-- Jamfile.jam \-- Jamroot.jam </pre> <p>Jamroot.jam:</p> <pre> project my_project : requirements multi debug:DEBUG : default-build static : build-dir bin ; alias project_1 : source/project_1 ; alias project_2 : source/project_2 ; alias project_3 : source/project_3 ; install dist : project_1 project_2 project_3 : on EXE ; </pre> <p>Each project has Jamfile.jam according to this template:</p> <pre> project project_N : requirements CONFIG_DEFINE_1= CONFIG_DEFINE_2= ; lib config : [ glob ../common/config/*.cpp ] ; exe project_N : [ glob *.cpp ] config : ; </pre> <p><code>config.cpp</code> uses defines <code>CONFIG_DEFINE_1</code> and <code>CONFIG_DEFINE_2</code> for conditional compilation (actually they are simply constants), so there's a separate version of <code>config</code> library per project.</p> <p>The problem is that such approach causes the <code>config</code> library to be rebuilt each time the whole project is built regardless of were the files changed or not. I.e. building the first time everything is compiled and linked, building the second time without doing any modifications - only the <code>config</code> library is built for each <code>project_N</code>. How should I properly setup the building so no redundand compilation occur?</p>
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    1. COI'm sorry to say I can't help you with Boost.Build. But have you seen that boost is in the state of switching to CMake?
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    2. COThank you for your reply. I've chosen Boost.Build for it's out of the box readiness to built on both Windows and Linux. Now I certainly should look to CMake.
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    3. COI don't think Boost is switching to CMake, just adding CMake support in addition to Boost.Build support.
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