add travis testing (gcc5, clang36)

- also relaxed CMake version to 2.8.7, the version default in travis

.travis.yml

@@ -0,0 +1,67 @@
+# Based on https://github.com/ldionne/hana/blob/master/.travis.yml
+
+language: cpp
+sudo: false
+
+matrix:
+  include:
+    - env: COMPILER=clang++-3.6 BUILD_TYPE=Debug CLANG=1
+      compiler: clang
+      addons: &clang36
+        apt:
+          packages:
+            - clang-3.6
+            - cmake
+          sources: &sources
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise-3.6
+            - kalakris-cmake
+    - env: COMPILER=clang++-3.6 BUILD_TYPE=Release CLANG=1
+      compiler: clang
+      addons: *clang36
+    - env: COMPILER=g++-5 BUILD_TYPE=Debug
+      compiler: gcc
+      addons: &gcc5
+        apt:
+          packages: g++-5
+          sources: *sources
+    - env: COMPILER=g++-5 BUILD_TYPE=Release
+      compiler: gcc
+      addons: *gcc5
+
+install:
+  - which $COMPILER
+  - DEPS_DIR="${TRAVIS_BUILD_DIR}/deps"
+  - mkdir ${DEPS_DIR} && cd ${DEPS_DIR}
+  - |
+    if [[ "$CLANG" == 1 && "${TRAVIS_OS_NAME}" == "linux" && "${STDLIB}" != "libstdc++" ]]; then
+      if [[ "${COMPILER}" == "clang++-3.5" ]]; then LLVM_VERSION="3.5.2"; fi
+      if [[ "${COMPILER}" == "clang++-3.6" ]]; then LLVM_VERSION="3.6.2"; fi
+      if [[ "${COMPILER}" == "clang++-3.7" ]]; then LLVM_VERSION="3.7.0"; fi
+      LLVM_URL="http://llvm.org/releases/${LLVM_VERSION}/llvm-${LLVM_VERSION}.src.tar.xz"
+      LIBCXX_URL="http://llvm.org/releases/${LLVM_VERSION}/libcxx-${LLVM_VERSION}.src.tar.xz"
+      LIBCXXABI_URL="http://llvm.org/releases/${LLVM_VERSION}/libcxxabi-${LLVM_VERSION}.src.tar.xz"
+      mkdir -p llvm llvm/build llvm/projects/libcxx llvm/projects/libcxxabi
+      travis_retry wget --quiet -O - ${LLVM_URL} | tar --strip-components=1 -xJ -C llvm
+      travis_retry wget --quiet -O - ${LIBCXX_URL} | tar --strip-components=1 -xJ -C llvm/projects/libcxx
+      travis_retry wget --quiet -O - ${LIBCXXABI_URL} | tar --strip-components=1 -xJ -C llvm/projects/libcxxabi
+      (cd llvm/build && cmake .. -DCMAKE_INSTALL_PREFIX=${DEPS_DIR}/llvm/install -DCMAKE_CXX_COMPILER=clang++)
+      (cd llvm/build/projects/libcxx && make install -j2)
+      (cd llvm/build/projects/libcxxabi && make install -j2)
+      export CXXFLAGS="-I ${DEPS_DIR}/llvm/install/include/c++/v1"
+      export LDFLAGS="-L ${DEPS_DIR}/llvm/install/lib -l c++ -l c++abi"
+      export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:${DEPS_DIR}/llvm/install/lib"
+    fi
+
+before_script:
+  - cd ${TRAVIS_BUILD_DIR}
+  - git clone --depth 1 https://github.com/Microsoft/unittest-cpp tests/unittest-cpp
+  - cmake -H. -Bb -DCMAKE_CXX_COMPILER=$COMPILER -DCMAKE_INSTALL_PREFIX=$PWD/o -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+  - cmake --build b
+
+script:
+  - cd b
+  - ctest
+
+notifications:
+  email: false

CMakeLists.txt

@@ -1,11 +1,11 @@
-cmake_minimum_required(VERSION 3.2.2)
+cmake_minimum_required(VERSION 2.8.7)
 
-project(GSL)
+project(GSL CXX)
 
 include_directories(
     ${CMAKE_CURRENT_BINARY_DIR}
 )
 
 enable_testing()
 
-add_subdirectory(tests)
+add_subdirectory(tests)

README.md

@@ -1,7 +1,7 @@
-# GSL: Guidelines Support Library
+# GSL: Guidelines Support Library [![Build Status](https://travis-ci.org/Microsoft/GSL.svg?branch=master)](https://travis-ci.org/Microsoft/GSL)
 
 The Guidelines Support Library (GSL) contains functions and types that are suggested for use by the
-[C++ Core Guidelines](https://github.com/isocpp/CppCoreGuidelines) maintained by the [Standard C++ Foundation](https://isocpp.org). 
+[C++ Core Guidelines](https://github.com/isocpp/CppCoreGuidelines) maintained by the [Standard C++ Foundation](https://isocpp.org).
 This repo contains Microsoft's implementation of GSL.
 
 The library includes types like `array_view<>`, `string_view<>`, `owner<>` and others.
@@ -12,7 +12,7 @@ While some types have been broken out into their own headers (e.g. [include/arra
 it is simplest to just include [gsl.h](./include/gsl.h) and gain access to the entire library.
 
 > NOTE: We encourage contributions that improve or refine any of the types in this library as well as ports to
-other platforms. Please see [CONTRIBUTING.md](./CONTRIBUTING.md) for more information about contributing. 
+other platforms. Please see [CONTRIBUTING.md](./CONTRIBUTING.md) for more information about contributing.
 
 # Quick Start
 ## Supported Platforms
@@ -27,13 +27,13 @@ The test suite that exercises GSL has been built and passes successfully on the
 * Mac OS Yosemite using XCode with AppleClang 7.0.0.7000072
 * Mac OS Yosemite using GCC-5.2.0
 
-> If you successfully port GSL to another platform, we would love to hear from you. Please submit an issue to let us know. Also please consider 
-contributing any changes that were necessary back to this project to benefit the wider community. 
+> If you successfully port GSL to another platform, we would love to hear from you. Please submit an issue to let us know. Also please consider
+contributing any changes that were necessary back to this project to benefit the wider community.
 
 ## Building the tests
 To build the tests, you will require the following:
 
-* [CMake](http://cmake.org), version 3.3 or later to be installed and in your PATH.
+* [CMake](http://cmake.org), version 2.8.7 or later to be installed and in your PATH.
 * [UnitTest-cpp](https://github.com/Microsoft/unittest-cpp), to be cloned under the [tests/unittest-cpp](./tests/unittest-cpp) directory
 of your GSL source.
 
@@ -46,13 +46,13 @@ These steps assume the source code of this repository has been cloned into a dir
         cd build-x86
 
 2. Configure CMake to use the compiler of your choice (you can see a list by running `cmake --help`).
-    
+
         cmake -G "Visual Studio 14 2015" c:\GSL
-    
+
 3. Build the test suite (in this case, in the Debug configuration, Release is another good choice).    
 
         cmake --build . --config Debug
- 
+
 4. Run the test suite.    
 
         ctest -C Debug

tests/CMakeLists.txt

@@ -1,6 +1,6 @@
-cmake_minimum_required(VERSION 3.2.2)
+cmake_minimum_required(VERSION 2.8.7)
 
-project(GSLTests)
+project(GSLTests CXX)
 
 add_subdirectory(unittest-cpp)
 
@@ -23,7 +23,7 @@ else()
     elseif(COMPILER_SUPPORTS_CXX11)
     	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
     else()
-            message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
+      message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
     endif()
 endif()
 
@@ -38,8 +38,8 @@ function(add_gsl_test name)
         RUNTIME DESTINATION bin
     )
     add_test(
-        NAME ${name}
-        COMMAND ${name}
+      ${name}
+      ${name}
     )
 endfunction()