travis: use gcc-7 on cocci build

Catches more errors, like switch statements fall throughs
that are caught in private QA.

.travis.yml

@@ -57,17 +57,21 @@ matrix:
   include:
     # Linux, gcc, coccinelle.
     - os: linux
-      compiler: gcc
+      compiler: gcc-7
       env:
-        - NAME="linux,gcc,cocci"
+        - NAME="linux,gcc-7,cocci"
         - *default-cflags
+        - NO_UNITTESTS=yes
       addons:
         apt:
           sources:
             - sourceline: ppa:npalix/coccinelle
+            # For gcc-7.
+            - sourceline: ppa:ubuntu-toolchain-r/test
           packages:
             - *packages
             - coccinelle
+            - gcc-7
     # Linux, gcc, Rust (latest stable).
     # This is allowed to fail, update allow_failures if the env changes.
     - os: linux
@@ -152,21 +156,22 @@ matrix:
 script:
   - sh ./autogen.sh
   - |
+    if [[ "${NO_UNITTESTS}" != "yes" ]]; then
+        ARGS="${ARGS} --enable-unittests"
+    fi
     if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
         export CFLAGS="${CFLAGS} ${EXTRA_CFLAGS}"
-        ./configure --enable-nfqueue --enable-unittests --enable-hiredis ${ARGS}
-    fi
-  - |
-    if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+        ./configure --enable-nfqueue --enable-hiredis ${ARGS}
+    elif [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
         export CFLAGS="${CFLAGS} ${EXTRA_CFLAGS}"
-        ./configure --enable-unittests --enable-hiredis --enable-ipfw \
+        ./configure --enable-hiredis --enable-ipfw \
             --enable-lua --with-libpcre-includes=/usr/local/include \
             --with-libpcre-includes=/usr/local/include \
             --with-libpcre-libraries=/usr/local/lib \
             --with-libnss-includes=/usr/local/opt/nss/include/nss \
             --with-libnss-libraries=/usr/local/opt/nss/lib \
             --with-libnspr-includes=/usr/local/opt/nspr/include/nspr \
-            --with-libnspr-libraries=/usr/local/opt/nspr/lib
+            --with-libnspr-libraries=/usr/local/opt/nspr/lib ${ARGS}
     fi
   - |
     # Linux container builds have 2 cores, make use of them.
@@ -177,6 +182,7 @@ script:
   - |
     # Like "make check", but fail on first error. We redirect the output
     # so Travis doesn't fail the build with a too much output error.
+    if [[ "${NO_UNITTESTS}" != "yes" ]]; then
         mkdir -p ./qa/log
         ./src/suricata -u -l ./qa/log --fatal-unittests > unittests.log 2>&1
         if [[ $? -ne 0 ]]; then
@@ -184,6 +190,7 @@ script:
             tail -n 500 unittests.log
             exit 1
         fi
+    fi
   - |
     if [[ "$DO_DISTCHECK" == "yes" ]]; then
         make distcheck DISTCHECK_CONFIGURE_FLAGS="${ARGS}"