Modify Travis config to add Linux support

.travis.yml

@@ -1,7 +1,45 @@
 language: cpp
-dist: trusty
+
+matrix:
+  # Linux / GCC 5.0
+  include:
+    - compiler: g++-5
       sudo: required
-compiler: clang
+      dist: trusty
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-5
+            - lua5.2
+            - liblua5.2-dev
+      before_install:
+        - sudo apt-get autoremove lua lua5.1
+      install:
+        - sudo apt-get install -y gdb
+        - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-5 30
+      after_failure:
+        - COREFILE=$(find . -maxdepth 1 -name "core*" | head -n 1) # find core file
+        - if [[ -f "$COREFILE" ]]; then gdb -c "$COREFILE" ./tests -ex "thread apply all bt" -ex "set pagination 0" -batch; fi
+      before_script:
+        - ulimit -c unlimited -S
+      script:
+        - mkdir build_dir && cd build_dir
+        - cmake -DLUA_INCLUDE_DIR="/usr/include/lua5.2" -DLUA_LIBRARY="/usr/lib/x86_64-linux-gnu/liblua5.2.so" ..
+        - make -j4 all && make install
+        - ./tests
+        - cd ../lua-tests/ && ./run_tests.lua
+    # Mac OS X / Clang 3.8
+    - compiler: clang
       os: osx
       osx_image: xcode8.2
-script: ./ci.sh
+      before_install:
+        - brew update
+      install:
+        - brew install lua
+      script:
+        - mkdir build_dir && cd build_dir
+        - cmake .. && make -j4 all && make install
+        - ./tests
+        - cd ../lua-tests && ./run_tests.lua

CMakeLists.txt

@@ -1,11 +1,12 @@
 cmake_minimum_required(VERSION 2.8)
 project(effil)
 
+if (NOT LUA_INCLUDE_DIR OR NOT LUA_LIBRARY)
     find_package(Lua REQUIRED)
-
     if( "${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}" LESS "5.2")
         message(FATAL_ERROR "Wrong Lua version ${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}, use 5.2 or higher")
     endif()
+endif()
 
 include_directories(src src/sol/single/sol ${LUA_INCLUDE_DIR})
 

ci.sh

@@ -1,16 +0,0 @@
-#!/bin/sh -e
-
-brew update && true
-brew install lua cmake && true
-
-ROOT_DIR=$( cd $(dirname $0); pwd )
-WORK_DIR=$ROOT_DIR/build
-
-mkdir -p $WORK_DIR
-
-# build
-(cd $WORK_DIR && cmake $ROOT_DIR && make -j4 all && make install)
-
-# run tests
-(cd $WORK_DIR && ./tests)
-(cd $ROOT_DIR/lua-tests && ./run_tests.lua)