Build native extensions when installing

Author: isuruf

.gitignore

@@ -8,3 +8,4 @@ ext/symengine/extconf.h
 notebooks/.ipynb_checkpoints/
 notebooks/Gemfile.lock
 callgrind.out.*
+*~

CMakeLists.txt

@@ -12,7 +12,4 @@ include_directories(${SYMENGINE_INCLUDE_DIRS})
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake/")
 find_package(Ruby REQUIRED)
 
-message("Copying source of ruby wrappers into: ${CMAKE_CURRENT_BINARY_DIR}")
-file(COPY ${ruby_wrapper_SOURCE_DIR}/ DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
-
-add_subdirectory(ext/symengine)
+add_subdirectory(ext/symengine)

ext/symengine/CMakeLists.txt

@@ -16,3 +16,10 @@ set_target_properties(symengine_ruby PROPERTIES
                         OUTPUT_NAME "symengine"
                         LIBRARY_OUTPUT_DIRECTORY "${ruby_wrapper_BINARY_DIR}/lib/symengine"
                      )
+
+# Ruby gems require a install target.
+install(TARGETS symengine_ruby
+            RUNTIME DESTINATION lib/symengine
+            ARCHIVE DESTINATION lib/symengine
+            LIBRARY DESTINATION lib/symengine
+        )

ext/symengine/extconf.rb

@@ -0,0 +1 @@
+exec 'cmake -DCMAKE_INSTALL_PREFIX=../../ %s ../../ ' % [ARGV.join(" ")]

symengine.gemspec

@@ -6,8 +6,9 @@ Gem::Specification.new do |gem|
     gem.authors = ['Abinash Meher']
     gem.email = ["abinashdakshana999@gmail.com"]
     gem.homepage = 'https://github.com/sympy/symengine'
-    gem.files = Dir["lib/**/*", "bin/*", "LICENSE", "*.md"]
+    gem.files = Dir["lib/**/*", "bin/*", "LICENSE", "*.md", "ext/**/*", "CMakeLists.txt"]
     gem.require_paths = ["lib"]
+    gem.extensions = ["ext/symengine/extconf.rb"]
     gem.license = 'MIT'
 
     gem.add_development_dependency 'bundler', '~> 1.7'