Added testing for c++17 to latest compilers with test with (#692)

* Added testing with std=c++17 for latest compilers

Added running latest compilers with -std=c++17 option to CI the test matrix,
Updated cmake configuration to allow passing c++ standard on the command line.

* attempt to fix appveyor break

* added clang6.0, removed c++17 tests for clang 5.0

* commented out tests for clang with c++17 die to issue #695

* Addresed comments

1 files changed, 54 insertions, 24 deletions

diff --git a/.travis.yml b/.travis.yml
index c373da2..bb32890 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,23 +23,23 @@ matrix:
     ##########################################################################
 
     # XCode 8.3
-    - env: COMPILER=clang++ BUILD_TYPE=Debug
+    - env: COMPILER=clang++ BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       os: osx
       osx_image: xcode8.3
       compiler: clang
 
-    - env: COMPILER=clang++ BUILD_TYPE=Release
+    - env: COMPILER=clang++ BUILD_TYPE=Release GSL_CXX_STANDARD=14
       os: osx
       osx_image: xcode8.3
       compiler: clang
 
     # XCode 9.1
-    - env: COMPILER=clang++ BUILD_TYPE=Debug
+    - env: COMPILER=clang++ BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       os: osx
       osx_image: xcode9.1
       compiler: clang
 
-    - env: COMPILER=clang++ BUILD_TYPE=Release
+    - env: COMPILER=clang++ BUILD_TYPE=Release GSL_CXX_STANDARD=14
       os: osx
       osx_image: xcode9.1
       compiler: clang
@@ -49,7 +49,7 @@ matrix:
     ##########################################################################
 
     # Clang 3.6
-    - env: COMPILER=clang++-3.6 BUILD_TYPE=Debug
+    - env: COMPILER=clang++-3.6 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       addons: &clang36
         apt:
           packages:
@@ -59,11 +59,11 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise-3.6
 
-    - env: COMPILER=clang++-3.6 BUILD_TYPE=Release
+    - env: COMPILER=clang++-3.6 BUILD_TYPE=Release GSL_CXX_STANDARD=14
       addons: *clang36
 
     # Clang 3.7
-    - env: COMPILER=clang++-3.7 BUILD_TYPE=Debug
+    - env: COMPILER=clang++-3.7 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       addons: &clang37
         apt:
           packages:
@@ -73,11 +73,11 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise-3.7
 
-    - env: COMPILER=clang++-3.7 BUILD_TYPE=Release
+    - env: COMPILER=clang++-3.7 BUILD_TYPE=Release GSL_CXX_STANDARD=14
       addons: *clang37
 
     # Clang 3.8
-    - env: COMPILER=clang++-3.8 BUILD_TYPE=Debug
+    - env: COMPILER=clang++-3.8 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       addons: &clang38
         apt:
           packages:
@@ -87,11 +87,11 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise-3.8
 
-    - env: COMPILER=clang++-3.8 BUILD_TYPE=Release
+    - env: COMPILER=clang++-3.8 BUILD_TYPE=Release GSL_CXX_STANDARD=14
       addons: *clang38
 
     # Clang 3.9
-    - env: COMPILER=clang++-3.9 BUILD_TYPE=Debug
+    - env: COMPILER=clang++-3.9 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       addons: &clang39
         apt:
           packages:
@@ -101,11 +101,11 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise-3.9
 
-    - env: COMPILER=clang++-3.9 BUILD_TYPE=Release
+    - env: COMPILER=clang++-3.9 BUILD_TYPE=Release GSL_CXX_STANDARD=14
       addons: *clang39
 
     # Clang 4.0
-    - env: COMPILER=clang++-4.0 BUILD_TYPE=Debug
+    - env: COMPILER=clang++-4.0 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       addons: &clang40
         apt:
           packages:
@@ -115,11 +115,11 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-trusty-4.0
 
-    - env: COMPILER=clang++-4.0 BUILD_TYPE=Release
+    - env: COMPILER=clang++-4.0 BUILD_TYPE=Release GSL_CXX_STANDARD=14
       addons: *clang40
 
     # Clang 5.0
-    - env: COMPILER=clang++-5.0 BUILD_TYPE=Debug
+    - env: COMPILER=clang++-5.0 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       addons: &clang50
         apt:
           packages:
@@ -131,46 +131,76 @@ matrix:
             - sourceline: 'deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-5.0 main'
               key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
 
-    - env: COMPILER=clang++-5.0 BUILD_TYPE=Release
-      addons: *clang50    
+    - env: COMPILER=clang++-5.0 BUILD_TYPE=Release GSL_CXX_STANDARD=14
+      addons: *clang50
+
+    # Clang 6.0
+    - env: COMPILER=clang++-6.0 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
+      addons: &clang60
+        apt:
+          packages:
+            - clang-6.0
+            - g++-6
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-trusty-6.0
+            - sourceline: 'deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-6.0 main'
+              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
+
+    - env: COMPILER=clang++-6.0 BUILD_TYPE=Release GSL_CXX_STANDARD=14
+      addons: *clang60
+
+    # Does not work due to #695
+    # Clang 6.0 c++17
+    #- env: COMPILER=clang++-6.0 BUILD_TYPE=Debug GSL_CXX_STANDARD=17
+    #  addons: *clang60
+
+    #- env: COMPILER=clang++-6.0 BUILD_TYPE=Release GSL_CXX_STANDARD=17
+    #  addons: *clang60
 
     ##########################################################################
     # GCC on Linux
     ##########################################################################
 
     # GCC 5
-    - env: COMPILER=g++-5 BUILD_TYPE=Debug
+    - env: COMPILER=g++-5 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       addons: &gcc5
         apt:
           packages: g++-5
           sources:
             - ubuntu-toolchain-r-test
 
-    - env: COMPILER=g++-5 BUILD_TYPE=Release
+    - env: COMPILER=g++-5 BUILD_TYPE=Release GSL_CXX_STANDARD=14
       addons: *gcc5
 
     # GCC 6
-    - env: COMPILER=g++-6 BUILD_TYPE=Debug
+    - env: COMPILER=g++-6 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       addons: &gcc6
         apt:
           packages: g++-6
           sources:
             - ubuntu-toolchain-r-test
 
-    - env: COMPILER=g++-6 BUILD_TYPE=Release
+    - env: COMPILER=g++-6 BUILD_TYPE=Release GSL_CXX_STANDARD=14
       addons: *gcc6
 
     # GCC 7
-    - env: COMPILER=g++-7 BUILD_TYPE=Debug
+    - env: COMPILER=g++-7 BUILD_TYPE=Debug GSL_CXX_STANDARD=14
       addons: &gcc7
         apt:
           packages: g++-7
           sources:
             - ubuntu-toolchain-r-test
 
-    - env: COMPILER=g++-7 BUILD_TYPE=Release
+    - env: COMPILER=g++-7 BUILD_TYPE=Release GSL_CXX_STANDARD=14
       addons: *gcc7
 
+    # GCC 7 c++17 
+    - env: COMPILER=g++-7 BUILD_TYPE=Debug GSL_CXX_STANDARD=17
+      addons: *gcc7
+
+    - env: COMPILER=g++-7 BUILD_TYPE=Release GSL_CXX_STANDARD=17
+      addons: *gcc7
 
 install:
   # Set the ${CXX} variable properly
@@ -230,7 +260,7 @@ before_script:
   # have CMake to generate build files
   - cd "${TRAVIS_BUILD_DIR}"
   - mkdir build && cd build
-  - cmake .. -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+  - cmake .. -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DGSL_CXX_STANDARD=$GSL_CXX_STANDARD
   
 script:
   # build and run tests