Issue 420 (go-spatial#471)

* use xgo for cross compiling. closes go-spatial#420
* bump postgres version in CI
* update postgis datafile URL

.travis.yml

@@ -41,10 +41,10 @@ services:
   - redis-server
 
 addons:
-  postgresql: "9.4"
+  postgresql: "9.6"
   apt:
     packages:
-    - postgresql-9.4-postgis-2.3
+    - postgresql-9.6-postgis-2.3
 
 install:
   - echo $TRAVIS_GO_VERSION

ci/build_binary.sh

@@ -3,6 +3,11 @@
 # This script will build the necessary binaries for tegola.
 ################################################################################
 
+# xgo is used for cross compiling cgo. use the docker container and xgo wrapper tool
+docker pull karalabe/xgo-latest
+source $CI_DIR/install_go_bin.sh
+go_install github.com/karalabe/xgo
+
 OLDDIR=$(pwd)
 VERSION_TAG=$TRAVIS_TAG
 if [ -z "$VERSION_TAG" ]; then 
@@ -35,7 +40,7 @@ do
 			FILENAME="${FILENAME}.exe"
 		fi
 
-		GOOS=${GOOS} GOARCH=${GOARCH} go build -ldflags "${LDFLAGS}" -o ${FILENAME} github.com/go-spatial/tegola/cmd/tegola
+		GOOS=${GOOS} GOARCH=${GOARCH} xgo build -ldflags "${LDFLAGS}" -o ${FILENAME} github.com/go-spatial/tegola/cmd/tegola
 		chmod a+x ${FILENAME}
 		dir=$(dirname $FILENAME)
 		fn=$(basename $FILENAME)
@@ -47,7 +52,3 @@ do
 	done
 done
 cd $OLDDIR
-
-
-
-

ci/config_postgis.sh

@@ -6,7 +6,7 @@ set -ex
 #	this command uses pg_restore and therefore leverages the environment variables document at https://www.postgresql.org/docs/9.2/static/libpq-envars.html
 configure_postgis() {
     local test_data="tegola.backup"
-    local test_data_url="https://s3-us-west-1.amazonaws.com/tegola-test-data/tegola-postgis-test-data.backup"
+    local test_data_url="https://raw.githubusercontent.com/go-spatial/tegola-testdata/master/tegola.backup"
 
     #   fetch our test data
     curl $test_data_url > $test_data