Updates to Travis CI configuration, serialize testing (TCP).

For now we have problems with TCP tests racing against each
other and this can lead to failures due to port use.  In the
old nanomsg repo we assigned several different port numbers on
the command line, but we lack that here generally.  However, we
feel that parallel testing is of little merit; its better to
build dedicated stress tests if that is what is desired.

We also use the matrix stuff a bit more sensibly, only installing
packages we actually use. This will likely lead to shorter startup
times.

Finally we cleaned up the environment so that we have sane defaults
for most environment variables.

1 files changed, 74 insertions, 59 deletions

diff --git a/.travis.yml b/.travis.yml
index e5aa1843..1cd539e5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,73 +1,88 @@
+# We use generic to avoid Travis from overriding our compiler choices.
+# Variables that can be set:
+#
+# CC - compiler name to use, e.g. clang-4.0
+# BUILD_TYPE - defaults to Debug, can be Release
+# CLANG_FORMAT - defaults to "no", set to name of clang-format-4.0 or better
+# COVERAGE - defaults to OFF, set to ON to enable code coverage
+# 
 language: generic
-dist: trusty
 sudo: false
-addons:
-  apt:
-    sources:
-      - ubuntu-toolchain-r-test
-      - llvm-toolchain-trusty-4.0
-    packages:
-      - cmake
-      - colordiff
-      - g++-4.9
-      - g++-7
-      - clang-4.0
-      - clang-format-4.0
 matrix:
   include:
+    # stock build (4.8 probably) - we also do a clang-format check here.
+    - os: linux
+      dist: trusty
+      addons:
+        apt:
+          sources:
+            - llvm-toolchain-trusty-4.0
+          packages:
+            - colordiff
+            - clang-format-4.0
+      env: CLANG_FORMAT=clang-format-4.0
+  
     # default gcc 4.9 build - we also do a clang-format check here.
     - os: linux
-      env: >-
-        CC=gcc-4.9
-        CXX=g++-4.9
-        COVERAGE=OFF
-        BUILD_TYPE=Debug
-        TEST_PARALLEL=-j4
-        CLANG_FORMAT=clang-format-4.0
+      dist: trusty
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-trusty-4.0
+          packages:
+            - colordiff
+            - gcc-4.9
+            - clang-format-4.0
+      env: CC=gcc-4.9
+
+    # gcc 7 (latest version) build
     - os: linux
-      env: >-
-        CC=gcc-7
-        CXX=g++-7
-        COVERAGE=OFF
-        BUILD_TYPE=Debug
-        TEST_PARALLEL=-j4
-        CLANG_FORMAT=no
+      dist: trusty
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - gcc-7
+      env: CC=gcc-7
+
     # clang v4 build
     - os: linux
-      env: >-
-        CC=clang-4.0
-        CXX=clang++-4.0
-        COVERAGE=OFF
-        BUILD_TYPE=Debug
-        TEST_PARALLEL=-j4
-        CLANG_FORMAT=no
-    # one release build
+      dist: trusty
+      addons:
+        apt:
+          sources:
+            - llvm-toolchain-trusty-4.0
+          packages:
+            - clang-4.0
+      env: CC=clang-4.0
+
+    # release build using clang 4
     - os: linux
-      env: >-
-        CC=clang-4.0
-        CXX=clang++-4.0
-        COVERAGE=OFF
-        BUILD_TYPE=Release
-        TEST_PARALLEL=-j4
-        CLANG_FORMAT=no
+      dist: trusty
+      addons:
+        apt:
+          sources:
+            - llvm-toolchain-trusty-4.0
+          packages:
+            - clang-4.0
+      env: CC=clang-4.0 BUILD_TYPE=Release
+
     # code coverage build
     - os: linux
-      env: >-
-        CC=gcc-7
-        CXX=g++-7
-        COVERAGE=ON
-        BUILD_TYPE=Debug
-        TEST_PARALLEL=-j1
-        CLANG_FORMAT=no
+      dist: trusty
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - gcc-7
+      env: CC=gcc-7 COVERAGE=ON
+
     # One MacOS X build
     - os: osx
-      env: >-
-        CC=clang
-        CXX=clang++
-        COVERAGE=OFF
-        TEST_PARALLEL=-j4
-        BUILD_TYPE=Debug
-        CLANG_FORMAT=no
+      env: CC=clang
 
 before_script:
   - uname -a
@@ -79,10 +94,10 @@ script:
   - mkdir build
   - cd build
   # Perform CMake backend generation, build, and test
-  - cmake -DCMAKE_BUILD_TYPE=${BUILD_TYPE} -DNNG_ENABLE_COVERAGE=${COVERAGE} ..
+  - cmake -DCMAKE_BUILD_TYPE=${BUILD_TYPE} -DNNG_ENABLE_COVERAGE=${COVERAGE:-OFF} ..
   - cmake --build . -- -j4
-  - ctest --output-on-failure -C ${BUILD_TYPE} ${TEST_PARALLEL}
-  - ../etc/format-check.sh
+  - ctest --output-on-failure -C ${BUILD_TYPE:-Debug}
+  - env CLANG_FORMAT=${CLANG_FORMAT:-no} ../etc/format-check.sh
 
 after_success:
   - ../etc/codecov.sh