Add CMake build support and Windows compatibility

.gitignore

@@ -5,6 +5,7 @@ __init__.py
 *sublime*
 .cache
 .vscode
+.vs
 
 *.o
 *.d
@@ -23,3 +24,5 @@ main
 
 celerite
 boost
+
+build/

CMakeLists.txt

@@ -0,0 +1,60 @@
+project(kima)
+# Just for Cmake to stop complaining
+cmake_minimum_required(VERSION 3.5)
+# Both kima and Dnest4 need c++11 so might as well set it globally for now
+set(CMAKE_CXX_STANDARD 11)
+
+add_executable(kima)
+target_compile_definitions(kima PUBLIC EIGEN_MPL2_ONLY)
+# target_compile_options(kima PRIVATE -pthread)
+set(source_dir ${CMAKE_CURRENT_SOURCE_DIR}/src)
+file(GLOB sources
+    ${source_dir}/*.cpp
+    ${source_dir}/distributions/*.cpp)
+target_sources(kima PUBLIC ${sources})
+# Include .h from kima
+target_include_directories(kima PUBLIC ${source_dir})
+# Include Eigen
+target_include_directories(kima PUBLIC eigen)
+
+
+# ----------------------- DNEST4 --------------------------------
+# Compile Dnest4 lib - Building everything here to not mess with DNest4 files
+add_library(dnest4 STATIC)
+
+# Define DNest4 sources and add include dirs
+set(dnest4_dir ${CMAKE_CURRENT_SOURCE_DIR}/DNest4/code)
+file(GLOB dnest4_sources
+    ${dnest4_dir}/*.cpp
+    ${dnest4_dir}/Distributions/*.cpp
+    ${dnest4_dir}/RJObject/ConditionalPriors/*.cpp)
+target_sources(dnest4 PRIVATE ${dnest4_sources})
+target_include_directories(dnest4 PUBLIC ${dnest4_dir})
+
+# Link DNest4 lib. Pthread comes from the PUBLIC interface
+target_link_libraries(kima PUBLIC dnest4)
+
+
+
+# OS-specific definitions
+# ---------------------------------------------------------------
+# If we are on windows, handle the lack of unistd and getopt files from DNest4
+if (WIN32)
+    set(libs_dir ${CMAKE_CURRENT_SOURCE_DIR}/libs/unistd)
+    file(GLOB libs_sources
+        ${libs_dir}/*.c)
+    target_sources(dnest4 PRIVATE ${libs_sources})
+    target_include_directories(dnest4 PRIVATE ${libs_dir})
+endif()
+
+# Debug compile options and definitions (can't target release and debug specifically yet). 
+# UNIX: Add pthread for threading
+# WINDOWS: Define _USE_MATH_DEFINES to have M_PI and M_PI_2 definitions
+# Extra info: iostream includes cmath in MSVC so we need definition at compiler level
+if (WIN32)
+    # target_compile_options(dnest4 PUBLIC -Wall)
+    target_compile_definitions(kima PUBLIC _USE_MATH_DEFINES)
+else()
+    # target_compile_options(dnest4 PUBLIC -Wall -Wextra -Wpedantic -Wconversion)
+    target_link_libraries(dnest4 PUBLIC pthread)
+endif()