Commit 0732b8cc authored by Peter Korsgaard's avatar Peter Korsgaard
Browse files

buildroot: support out-of-tree builds 

Add support and documentation for out-of-tree builds with syntax
like the Linux kernel (make O=<dir>).
parent d5007ac6

docs/buildroot.html

+14 −0
Original line number Diff line number Diff line
@@ -217,6 +217,20 @@ 
    <p>You can now disconnect or copy the content of your <code>dl</code> 

    directory to the build-host. </p>



    <h3><a name="building_out_of_tree" id="building_out_of_tree"></a>

    Building out-of-tree</h3>



    <p>Buildroot supports building out of tree with a syntax similar

    to the Linux kernel. To use it, add O=&lt;directory&gt; to the

    make command line, E.G.:</p>



<pre>

 $ make O=/tmp/build

</pre>



    <p>And all the output files will be located under

    <code>/tmp/build</code>.</p>



    <h3><a name="environment_variables" id="environment_variables"></a>

    Environment variables</h3>

project/Makefile.in

+7 −0
Original line number Diff line number Diff line
@@ -25,7 +25,14 @@ TAR_OPTIONS=$(subst ",, $(BR2_TAR_OPTIONS)) -xf 
#")





# Buildroot supports building out of tree similarly to the Linux kernel.

# To use, add O= to the make command line (make O=/tmp/build)

BASE_DIR:=$(shell pwd)

ifdef O

ifeq ("$(origin O)", "command line")

BASE_DIR := $(O)

endif

endif



TOPDIR_PREFIX:=$(strip $(subst ",, $(BR2_TOPDIR_PREFIX)))_

#"))