add eigen

packages/e/eigen/xmake.lua

@@ -0,0 +1,32 @@
+package("eigen")
+
+    set_homepage("https://eigen.tuxfamily.org/")
+    set_description("C++ template library for linear algebra")
+
+    add_urls("https://gitlab.com/libeigen/eigen/-/archive/$(version)/eigen-$(version).tar.bz2",
+             "https://gitlab.com/libeigen/eigen")
+    add_versions("3.3.7", "685adf14bd8e9c015b78097c1dc22f2f01343756f196acdc76a678e1ae352e11")
+
+    add_deps("cmake")
+    add_includedirs("include/eigen3")
+
+    on_install("macosx", "linux", "windows", function (package)
+        import("package.tools.cmake").install(package)
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include <iostream>
+            #include <Eigen/Dense>
+            using Eigen::MatrixXd;
+            void test()
+            {
+                MatrixXd m(2,2);
+                m(0,0) = 3;
+                m(1,0) = 2.5;
+                m(0,1) = -1;
+                m(1,1) = m(1,0) + m(0,1);
+                std::cout << m << std::endl;
+            }
+        ]]}, {configs = {languages = "c++11"}}))
+    end)