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readme: add a section about CONFIG

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Change-Id: I5a6cd28ee9a3b37921355af46dafdd0f4b606c1a
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
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Daniel Verkamp 2017-01-13 13:46:37 -07:00 committed by Jim Harris
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@ -69,6 +69,27 @@ FreeBSD:
4) (cd dpdk-16.11 && gmake install T=x86_64-native-bsdapp-clang DESTDIR=.)
Build Configuration
===================
Optional components and other build-time configuration are controlled by the `CONFIG` file
in the root SPDK directory. `CONFIG` is a Makefile fragment that may be edited before building to
control which options are enabled.
Boolean (on/off) options are configured with a 'y' (yes) or 'n' (no). For example, this line of
`CONFIG` controls whether the optional RDMA (libibverbs) support is enabled:
CONFIG_RDMA?=n
To enable RDMA, this line of CONFIG may be modified to contain 'y' instead of 'n'.
Alternatively, `CONFIG` options may also be overrriden on the `make` command line:
make CONFIG_RDMA=y
The options specified on the `make` command line take precedence over the default values in
`CONFIG`.
Building
========