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Makefile: add REBAR_BASE_DIR variable

This allows building and running osmo-s1gw out-of-tree.

Change-Id: I7b6984c22253da69c0bda79ea8bef9608b2509cd
Related: SYS#7332
---
M Makefile
1 file changed, 6 insertions(+), 4 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/erlang/osmo-s1gw refs/changes/76/40776/1

diff --git a/Makefile b/Makefile
index ad7b531..1f37da5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+# where rebar3 stores build output
+REBAR_BASE_DIR ?= _build
 # config file used by 'run' and 'shell'
 CONFIG ?= config/sys.config
 # arguments passed to eunit, used by 'check'
@@ -19,7 +21,7 @@
 	rebar3 escriptize
 
 run: build
-	ERL_FLAGS='-config $(CONFIG)' _build/default/bin/osmo-s1gw
+	ERL_FLAGS='-config $(CONFIG)' $(REBAR_BASE_DIR)/default/bin/osmo-s1gw
 
 shell: build
 	rebar3 shell --config $(CONFIG)
@@ -39,13 +41,13 @@
 		$(DESTDIR)$(SYSTEMDUNITDIR)/osmo-s1gw.service
 
 clean:
-# Avoid running rebar3 clean if _build doesn't exist, since it would try
+# Avoid running rebar3 clean if $(REBAR_BASE_DIR) doesn't exist, since it would try
 # to fetch deps from the Internet and that may not be avaialble when in
 # OBS build.
-ifneq ("$(wildcard _build/.*)", "")
+ifneq ("$(wildcard $(REBAR_BASE_DIR)/.*)", "")
 	rebar3 asn clean
 	rebar3 clean
-	rm -rf _build/
+	rm -rf $(REBAR_BASE_DIR)
 else
 	rm -f $(GEN_FILES)
 endif

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