Add clang static analyzer to continuous integration checks. (#162)

.travis.yml

@@ -41,6 +41,9 @@ matrix:
     - env: BUILD_TARGET="pretty-check"
       compiler: clang
       os: linux
+    - env: BUILD_TARGET="scan-build"
+      compiler: clang
+      os: linux
     - env: BUILD_TARGET="posix"
       compiler: clang
       os: linux

.travis/before_install.sh

@@ -46,6 +46,10 @@ cd /tmp || die
         export PATH=/tmp/gcc-arm-none-eabi-4_9-2015q3/bin:$PATH || die
         arm-none-eabi-gcc --version || die
     }
+
+    [ $BUILD_TARGET != scan-build ] || {
+        sudo apt-get install clang || die
+    }
 }
 
 [ $TRAVIS_OS_NAME != osx ] || {

.travis/script.sh

@@ -50,3 +50,8 @@ set -x
     export PATH=/tmp/gcc-arm-none-eabi-4_9-2015q3/bin:$PATH || die
     make -f examples/cc2538/Makefile-cc2538 || die
 }
+
+[ $BUILD_TARGET != scan-build ] || {
+    ./configure --with-examples=posix --enable-cli
+    scan-build --status-bugs -v make
+}