Enable OSX builds

.travis.yml

@@ -11,15 +11,25 @@ notifications:
 
 os:
 - linux
+- osx
 
 env:
 - LUA=5.1
 - LUA=5.2
 - LUA=5.3
 
+matrix:
+  exclude:
+  - os: osx
+    env: LUA=5.1
+  - os: osx
+    env: LUA=5.2
+  allow_failures:
+  - os: osx
+
 before_script:
-- sudo apt install -y liblua${LUA}-dev
-- git submodule update --init
+- if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt install -y liblua${LUA}-dev; fi
+- if [ "$TRAVIS_OS_NAME" == "osx" ] ; then brew link gettext --force; fi
 - mkdir build
 - cd build
 
@@ -39,3 +49,13 @@ addons:
     - qtbase5-dev
     - qtbase5-dev-tools
     - libqt5opengl5-dev
+  homebrew:
+    packages:
+    - cspice
+    - fmt
+    - freeglut
+    - gettext
+    - glew
+    - libpng
+    - lua
+    - qt5

CMakeLists.txt

@@ -260,6 +260,14 @@ add_definitions(
   -DGIT_COMMIT=${GIT_COMMIT}
 )
 
+if(APPLE)
+  # TARGET_OS_MAC should be replaced with __APPLE__
+  add_definitions(-DTARGET_OS_MAC)
+  # Dirty hack to prevent AIFF.h inclusion which provides `struct Marker`
+  # conflicting with out `class Marker`.
+  add_definitions(-D__AIFF__)
+endif()
+
 string(TOLOWER "${CMAKE_BUILD_TYPE}" build_type_lc)
 if(NOT "${build_type_lc}" STREQUAL "debug")
   add_definitions(-DNO_DEBUG -DEIGEN_NO_DEBUG)

src/celestia/qt/CMakeLists.txt

@@ -3,6 +3,13 @@ if(NOT ENABLE_QT)
   return()
 endif()
 
+if(APPLE AND EXISTS /usr/local/opt/qt5)
+  # Homebrew installs Qt5 (up to at least 5.9.1) in
+  # /usr/local/qt5, ensure it can be found by CMake since
+  # it is not in the default /usr/local prefix.
+  list(APPEND CMAKE_PREFIX_PATH "/usr/local/opt/qt5")
+endif()
+
 set(QT_LIBS Widgets OpenGL)
 find_package(Qt5 COMPONENTS ${QT_LIBS} CONFIG REQUIRED)
 
@@ -54,7 +61,7 @@ set(CMAKE_AUTOUIC ON)
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 qt5_add_resources(RC_SRC "icons.qrc")
 
-if (WIN32)
+if(WIN32)
   set (RES celestia.rc)
 endif()
 
@@ -62,4 +69,8 @@ add_executable(celestia-qt WIN32 ${QT_SOURCES} ${RC_SRC} ${RES})
 cotire(celestia-qt)
 qt5_use_modules(celestia-qt ${QT_LIBS})
 target_link_libraries(celestia-qt ${CELESTIA_LIBS})
+if(APPLE)
+  set_property(TARGET celestia-qt APPEND_STRING PROPERTY LINK_FLAGS " -framework CoreFoundation")
+  set_property(TARGET celestia-qt APPEND_STRING PROPERTY LINK_FLAGS " -framework CoreServices")
+endif()
 install(TARGETS celestia-qt RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})