Automake to compile objects in a specific directory

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What I found so far is the Parallel Build Trees (a.k.a. VPATH Builds).

We just have to run our default configure script in a subdirectory, that will create a new tree. We would then have the sources tree and the build tree.

If configure is executed in its own directory, the source and build trees are combined: derived files are constructed in the same directories as their sources.

I new where to create object files in my own makefile, now it is more convenient to create the build tree.

My tree is like above, with the empied obj dir (we should not create it obj as BSD don't like that)

cd obj
../configure
make

That's it, I now have a clean source tree and a build tree completly out of my repo.

.
|-- configure.ac
|-- include
|   |-- header1.h
|   |-- header2.h
|   `-- Makefile.am
|-- Makefile.am
|-- obj
|   `-- config.log
|   |-- config.status
|   |-- include
|   |   `-- Makefile
|   |-- Makefile
|   `-- src
|       |-- main.o
|       |-- snd.o
|       `-- Makefile
`-- src
    |-- Makefile.am
    |-- main.cc
    |-- snd.cc
    |-- Makefile.am
    `-- USBdiscovery.cc