Add travis configuration.

.travis.yml

@@ -0,0 +1,33 @@
+sudo: false
+
+language:
+  - cpp
+
+script:
+  - mkdir build
+  - cd build
+  - cmake ..
+  - cmake --build .
+
+notifications:
+  email: false
+
+jobs:
+  include:
+    # ubuntu 16.04, gcc-9
+    - os: linux
+      compiler: gcc
+      addons: { apt: { packages: ["g++-9", "ninja-build"],
+                       sources: ["ubuntu-toolchain-r-test"] } }
+
+    # ubuntu 16.04, clang-8
+    - os: linux
+      compiler: clang
+      addons: { apt: { packages: ["clang-8", "ninja-build"],
+                       sources: ["llvm-toolchain-xenial-8"] } }
+
+    # OS X High Sierra 10.13
+    - os: osx
+
+    # Windows
+    - os: windows

CMakeLists.txt

@@ -74,7 +74,7 @@ foreach(lib screen dom component)
       $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
     PRIVATE src
   )
-  target_compile_features(${lib} PUBLIC cxx_std_17)
+  set_property(TARGET ${lib} PROPERTY CXX_STANDARD 17)
   target_compile_options(${lib} PRIVATE -Wall -Werror -pedantic -Wextra -Wno-sign-compare)
 endforeach()
 

examples/component/CMakeLists.txt

@@ -1,6 +1,7 @@
 function(example name)
   add_executable(${name} ${name}.cpp)
   target_link_libraries(${name} PUBLIC component)
+  set_property(TARGET ${name} PROPERTY CXX_STANDARD 17)
 endfunction(example)
 
 example(checkbox)

examples/dom/CMakeLists.txt

@@ -1,6 +1,7 @@
 function(example name)
   add_executable(${name} ${name}.cpp)
   target_link_libraries(${name} PUBLIC dom)
+  set_property(TARGET ${name} PROPERTY CXX_STANDARD 17)
 endfunction(example)
 
 example(dbox)

examples/util/CMakeLists.txt

@@ -1,6 +1,7 @@
 function(example name)
   add_executable(${name} ${name}.cpp)
   target_link_libraries(${name} PUBLIC component)
+  set_property(TARGET ${name} PROPERTY CXX_STANDARD 17)
 endfunction(example)
 
 example(print_key_press)