Split Travis jobs to avoid timeout

.travis.yml

@@ -30,7 +30,17 @@ matrix:
 
     - os: linux
       compiler: g++-5
-      env: TOOLSET=gcc-5 CXXSTD=03,11,14,1z
+      env: TOOLSET=gcc-5 CXXSTD=03,11
+      addons:
+        apt:
+          packages:
+            - g++-5
+          sources:
+            - ubuntu-toolchain-r-test
+
+    - os: linux
+      compiler: g++-5
+      env: TOOLSET=gcc-5 CXXSTD=14,1z
       addons:
         apt:
           packages:
@@ -40,7 +50,17 @@ matrix:
 
     - os: linux
       compiler: g++-6
-      env: TOOLSET=gcc-6 CXXSTD=03,11,14,1z
+      env: TOOLSET=gcc-6 CXXSTD=03,11
+      addons:
+        apt:
+          packages:
+            - g++-6
+          sources:
+            - ubuntu-toolchain-r-test
+
+    - os: linux
+      compiler: g++-6
+      env: TOOLSET=gcc-6 CXXSTD=14,1z
       addons:
         apt:
           packages:
@@ -50,7 +70,17 @@ matrix:
 
     - os: linux
       compiler: g++-7
-      env: TOOLSET=gcc-7 CXXSTD=03,11,14,17
+      env: TOOLSET=gcc-7 CXXSTD=03,11
+      addons:
+        apt:
+          packages:
+            - g++-7
+          sources:
+            - ubuntu-toolchain-r-test
+
+    - os: linux
+      compiler: g++-7
+      env: TOOLSET=gcc-7 CXXSTD=14,17
       addons:
         apt:
           packages:
@@ -60,7 +90,11 @@ matrix:
 
     - os: linux
       compiler: clang++
-      env: TOOLSET=clang CXXSTD=03,11,14,1z
+      env: TOOLSET=clang CXXSTD=03,11
+
+    - os: linux
+      compiler: clang++
+      env: TOOLSET=clang CXXSTD=14,1z
       addons:
         apt:
           packages:
@@ -70,7 +104,11 @@ matrix:
 
     - os: osx
       compiler: clang++
-      env: TOOLSET=clang CXXSTD=03,11,14,1z
+      env: TOOLSET=clang CXXSTD=03,11
+
+    - os: osx
+      compiler: clang++
+      env: TOOLSET=clang CXXSTD=14,1z
 
 install:
   - BOOST_BRANCH=develop && [ "$TRAVIS_BRANCH" == "master" ] && BOOST_BRANCH=master || true