test for more compilers

.travis.yml

@@ -1,26 +1,87 @@
-language: cpp
+language: c
+cache: ccache
+matrix:
+# gcc
+  include:
+    - os: linux
+      dist: xenial
+      compiler: gcc
+      addons:
+        apt:
+          packages:
+            - valgrind
+            - cppcheck
+      env: CHECK="true"
+    - os: linux
+      dist: xenial
+      compiler: gcc
+    - os: linux
+      dist: xenial
+      compiler: gcc
+      env: MATRIX_EVAL="CC=gcc-6 && CXX=g++-6"
+    - os: linux
+      dist: xenial
+      compiler: gcc
+      env: MATRIX_EVAL="CC=gcc-7 && CXX=g++-7"
+    - os: linux
+      dist: xenial
+      compiler: gcc
+      env: MATRIX_EVAL="CC=gcc-8 && CXX=g++-8"
 
-compiler:
-  - gcc
-  - clang
+# clang
+    - os: linux
+      dist: xenial
+      compiler: clang
+      addons:
+        apt:
+          sources:
+            - llvm-toolchain-xenial-5.0
+          packages:
+            - clang-5.0
+      env: MATRIX_EVAL="CC=clang-5.0 && CXX=clang++-5.0"
+    - os: linux
+      dist: xenial
+      compiler: clang
+      addons:
+        apt:
+          sources:
+            - llvm-toolchain-xenial-6.0
+          packages:
+            - clang-6.0
+            - cppcheck
+      env: MATRIX_EVAL="CC=clang-6.0 && CXX=clang++-6.0"
+    # The default clang on xenial is clang 7.0
+    - os: linux
+      dist: xenial
+      compiler: clang
+# osx
+    - os: osx
+      osx_image: xcode9.4
+      env: XCODE="true"
+    - os: osx
+      osx_image: xcode10.1
+      env: XCODE="true" CHECK="true"
 
-addons:
-  apt:
-    packages:
-      - cppcheck
-      - valgrind
+#  allow_failures:
+#    - os: osx
 
-os:
-  - linux
-  - osx
+install:
+  - sh autogen.sh
 
 before_install:
+  - echo $CC
   - echo $LANG
   - echo $LC_ALL
   - set -e
-
-install:
-  - sh autogen.sh
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then
+      eval "${MATRIX_EVAL}";
+      if [ -n "$MATRIX_EVAL" ] && [ "$TRAVIS_COMPILER" != "clang" ]; then
+        sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6B05F25D762E3157;
+        sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test;
+        sudo apt-get update -qq;
+        sudo apt-get install -y $CC;
+      fi;
+    fi
 
 before_script:
   - ./configure
@@ -29,9 +90,13 @@ script:
   - make
 
 after_success:
-  - make check ; result=$?
-  - if [ $result != 0 ]; then
-      cat tests/*.log;
+  - if [ -n "$CHECK" ]; then
+      make distcheck;
+      result=$?;
+      if [ $result != 0 ]; then
+        cat tests/*.log;
+        exit $result;
+      fi;
+      if type cppcheck &> /dev/null ; then cppcheck --error-exitcode=1 --quiet *.h *.c tests/ ; fi;
     fi
-  - if type cppcheck &> /dev/null ; then cppcheck --error-exitcode=1 --quiet *.h *.c tests/ ; fi
-  - exit $result
+