add libsvm (#646)

packages/l/libsvm/xmake.lua

@@ -0,0 +1,30 @@
+package("libsvm")
+
+    set_homepage("https://github.com/cjlin1/libsvm")
+    set_description("A simple, easy-to-use, and efficient software for SVM classification and regression")
+
+    add_urls("https://github.com/cjlin1/libsvm/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/cjlin1/libsvm.git")
+    add_versions("v325",  "1f587ec0df6fd422dfe50f942f8836ac179b0723b768fe9d2fabdfd1601a0963")
+
+    on_install(function (package)
+        io.writefile("xmake.lua", [[
+            add_rules("mode.debug", "mode.release")
+            target("svm")
+                set_kind("$(kind)")
+                add_files("svm.cpp")
+                add_headerfiles("svm.h")
+                if is_kind("shared") then
+                    add_shflags("/DEF:svm.def")
+                end
+        ]])
+        local configs = {}
+        if package:config("shared") then
+            configs.kind = "shared"
+        end
+        import("package.tools.xmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("svm_train", {includes = "svm.h"}))
+    end)