Added GSL (#40)

* added environment file

* Added GSL

* Fixed travis.yml:

* Maybed actually fixed travis

* More travis fixes

.travis.yml

@@ -39,7 +39,8 @@ install:
     fi
   - bash miniconda.sh -b -p $HOME/miniconda
   - export PATH="$HOME/miniconda/bin:$PATH"
-  - conda install -y -c conda-forge cmake
+  - conda env create -f environment.yml -n eal
+  - source activate eal
 
 script:
   - mkdir build

CMakeLists.txt

@@ -17,6 +17,9 @@ include(CTest)
 
 set(CMAKE_CXX_STANDARD 11)
 
+# Third Party Dependencies
+find_package(GSL)
+
 # Library setup
 add_library(usgsephem SHARED
             src/eal.cpp
@@ -28,13 +31,18 @@ set_target_properties(usgsephem PROPERTIES
 set(EPHEM_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/include/"
                        "${CMAKE_CURRENT_SOURCE_DIR}/include/json")
 target_include_directories(usgsephem
+                           PRIVATE
+                           ${GSL_INCLUDE_DIRS}
                            PUBLIC
-                           "${EPHEM_INCLUDE_DIRS}"
+                           ${EPHEM_INCLUDE_DIRS}
 )
 
 # Setup for GoogleTest
 find_package (Threads)
-target_link_libraries(usgsephem PUBLIC
+target_link_libraries(usgsephem
+                      PRIVATE
+                      ${GSL_LIBRARIES}
+                      PUBLIC
                       gtest ${CMAKE_THREAD_LIBS_INIT})
 
 # Setup for ctest

environment.yml

+name: eal
+
+channels:
+  - conda-forge
+
+dependencies:
+  - cmake>=3.10
+  - gsl

src/eal.cpp

-
 #include "eal.h"
 
 #include <json.hpp>
+
+#include <gsl/gsl_spline.h>
+
 #include <string>
 
 using json = nlohmann::json;
 
-
 using namespace eal;