Add GCC 8 and GCC 9 in the Travis CI build matrix

Author: SRombauts

.travis.yml

@@ -102,7 +102,7 @@ matrix:
         - CC=gcc-5
         - CXX=g++-5
         - CXXFLAGS="-std=c++1z -Wall -Wextra -pedantic"
-    # gcc 6 std=c++14
+    # gcc 6.5 std=c++14 (default standard)
     - compiler: gcc
       addons:
         apt:
@@ -114,7 +114,7 @@ matrix:
         - CC=gcc-6
         - CXX=g++-6
         - CXXFLAGS="-std=c++14 -Wall -Wextra -pedantic"
-    # gcc 6 std=c++1z
+    # gcc 6.5 std=c++1z
     - compiler: gcc
       addons:
         apt:
@@ -126,7 +126,7 @@ matrix:
         - CC=gcc-6
         - CXX=g++-6
         - CXXFLAGS="-std=c++1z -Wall -Wextra -pedantic"
-    # gcc 7 std=c++14
+    # gcc 7.4 std=c++14 (default standard)
     - compiler: gcc
       addons:
         apt:
@@ -138,7 +138,7 @@ matrix:
         - CC=gcc-7
         - CXX=g++-7
         - CXXFLAGS="-std=c++14 -Wall -Wextra -pedantic"
-    # gcc 7 std=c++1z
+    # gcc 7.4 std=c++17
     - compiler: gcc
       addons:
         apt:
@@ -149,7 +149,80 @@ matrix:
       env:
         - CC=gcc-7
         - CXX=g++-7
-        - CXXFLAGS="-std=c++1z -Wall -Wextra -pedantic"
+        - CXXFLAGS="-std=c++17 -Wall -Wextra -pedantic"
+    # gcc 8 std=c++14 (default standard)
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-8
+      env:
+        - CC=gcc-8
+        - CXX=g++-8
+        - CXXFLAGS="-std=c++14 -Wall -Wextra -pedantic"
+    # gcc 8 std=c++17
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-8
+      env:
+        - CC=gcc-8
+        - CXX=g++-8
+        - CXXFLAGS="-std=c++17 -Wall -Wextra -pedantic"
+    # gcc 8 std=c++2a
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-8
+      env:
+        - CC=gcc-8
+        - CXX=g++-8
+        - CXXFLAGS="-std=c++2a -Wall -Wextra -pedantic"
+    # gcc 9 std=c++14 (default standard)
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-9
+      env:
+        - CC=gcc-9
+        - CXX=g++-9
+        - CXXFLAGS="-std=c++14 -Wall -Wextra -pedantic"
+# TODO: issue with ExecuteMany and Bind helper function
+#    # gcc 9 std=c++17
+#    - compiler: gcc
+#      addons:
+#        apt:
+#          sources:
+#            - ubuntu-toolchain-r-test
+#          packages:
+#            - g++-9
+#      env:
+#        - CC=gcc-9
+#        - CXX=g++-9
+#        - CXXFLAGS="-std=c++17 -Wall -Wextra -pedantic"
+#    # gcc 9 std=c++2a
+#    - compiler: gcc
+#      addons:
+#        apt:
+#          sources:
+#            - ubuntu-toolchain-r-test
+#          packages:
+#            - g++-9
+#      env:
+#        - CC=gcc-9
+#        - CXX=g++-9
+#        - CXXFLAGS="-std=c++2a -Wall -Wextra -pedantic"
     # clang default
     - compiler: clang
       env: