fix longpaths for libtorch Windows (#357)

* add libtorch

* update to 1.8.1

* remove unused package stubs

* update for system package

* remove git.core.longpaths setting

* fix longpaths for libtorch

Co-authored-by: xq114 <1140735506@qq.com>

packages/c/cuda/xmake.lua

@@ -0,0 +1,29 @@
+package("cuda")
+
+    set_homepage("https://developer.nvidia.com/cuda-zone/")
+    set_description("CUDA® is a parallel computing platform and programming model developed by NVIDIA for general computing on graphical processing units (GPUs).")
+
+    add_configs("utils", {description = "enabled cuda utilities.", default = {}, type = "table"})
+
+    on_fetch(function (package, opt)
+        if opt.system then
+            import("detect.sdks.find_cuda")
+            import("lib.detect.find_library")
+
+            local cuda = find_cuda()
+            if cuda then
+                package:addenv("PATH", cuda.bindir)
+                local result = {includedirs = cuda.includedirs, linkdirs = cuda.linkdirs, links = {}}
+                local utils = package:config("utils")
+                table.insert(utils, package:config("shared") and "cudart" or "cudart_static")
+        
+                for _, util in ipairs(utils) do
+                    if not find_library(util, cuda.linkdirs) then
+                        return
+                    end
+                    table.insert(result.links, util)
+                end
+                return result
+            end
+        end
+    end)

packages/l/libtorch/xmake.lua

@@ -0,0 +1,127 @@
+package("libtorch")
+
+    set_homepage("https://pytorch.org/")
+    set_description("An open source machine learning framework that accelerates the path from research prototyping to production deployment.")
+    set_license("BSD-3-Clause")
+
+    add_urls("https://github.com/pytorch/pytorch.git")
+    add_versions("v1.8.0", "37c1f4a7fef115d719104e871d0cf39434aa9d56")
+    add_versions("v1.8.1", "56b43f4fec1f76953f15a627694d4bba34588969")
+
+    add_configs("python", {description = "Build python interface.", default = false, type = "boolean"})
+    add_configs("ninja", {description = "Use ninja as build tool.", default = false, type = "boolean"})
+
+    add_deps("cmake")
+    add_deps("python 3.x", {kind = "binary", system = false})
+    add_deps("libuv")
+    add_deps("cuda", {optional = true, configs = {utils = {"nvrtc", "cudnn", "cufft", "curand", "cublas", "cudart_static"}}})
+    add_deps("nvtx", "mkl", {optional = true, system = true})
+    add_includedirs("include")
+    add_includedirs("include/torch/csrc/api/include")
+
+    -- enable long paths for git submodule on windows
+    if is_host("windows") then
+        set_policy("platform.longpaths", true)
+    end
+
+    -- prevent the link to the libraries found automatically
+    add_links("")
+
+    on_load("windows|x64", "macosx", "linux", function (package)
+        if package:config("ninja") then
+            package:add("deps", "ninja")
+        end
+
+        if not package:is_plat("macosx") then
+            if not find_package("mkl") then
+                package:add("deps", "openblas")
+            end
+        end
+    end)
+
+    on_install("windows|x64", "macosx", "linux", function (package)
+        import("package.tools.cmake")
+
+        -- tackle link flags
+        local has_cuda = package:dep("cuda"):exists() and package:dep("nvtx"):exists()
+        local libnames = {"torch", "torch_cpu"}
+        if has_cuda then
+            table.insert(libnames, "torch_cuda")
+        end
+        table.insert(libnames, "c10")
+        if has_cuda then
+            table.insert(libnames, "c10_cuda")
+        end
+        local suffix = ""
+        if not package:is_plat("windows") and package:config("shared") then
+            package:add("ldflags", "-Wl,-rpath," .. package:installdir("lib"))
+            if package:is_plat("linux") then
+                suffix = ".so"
+            elseif package:is_plat("macosx") then
+                suffix = ".dylib"
+            end
+            for _, lib in ipairs(libnames) do
+                package:add("ldflags", (package:is_plat("linux") and "-Wl,--no-as-needed," or "") .. package:installdir("lib", "lib") .. lib .. suffix)
+            end
+        else
+            for _, lib in ipairs(libnames) do
+                package:add("links", lib)
+            end
+        end
+
+        -- some patches to the third-party cmake files
+        io.replace("cmake/Modules/FindMKL.cmake", "MSVC AND NOT CMAKE_CXX_COMPILER_ID STREQUAL \"Intel\"", "FALSE", {plain = true})
+        io.replace("third_party/fbgemm/CMakeLists.txt", "PRIVATE FBGEMM_STATIC", "PUBLIC FBGEMM_STATIC", {plain = true})
+        io.replace("third_party/protobuf/cmake/install.cmake", "install%(DIRECTORY.-%)", "")
+        io.replace("third_party/ideep/mkl-dnn/src/CMakeLists.txt", "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}", "${CMAKE_INSTALL_LIBDIR}", {plain = true})
+        if package:is_plat("windows") then
+            io.replace("cmake/Modules/FindOpenBLAS.cmake", "NAMES openblas PATHS", "NAMES libopenblas PATHS", {plain = true})
+            if package:config("vs_runtime"):startswith("MD") then
+                io.replace("third_party/fbgemm/CMakeLists.txt", "MT", "MD", {plain = true})
+            end
+        end
+
+        -- prepare python
+        os.vrun("python -m pip install typing_extensions pyyaml")
+        local configs = {"-DUSE_MPI=OFF"}
+        if package:config("python") then
+            table.insert(configs, "-DBUILD_PYTHON=ON")
+            os.vrun("python -m pip install numpy")
+        else
+            table.insert(configs, "-DBUILD_PYTHON=OFF")
+        end
+
+        -- prepare for installation
+        local extracfg = {}
+        if package:config("ninja") then
+            extracfg.cmake_generator = "Ninja"
+        end
+        local envs = cmake.buildenvs(package, extracfg)
+        if not package:is_plat("macosx") then
+            if package:dep("mkl"):exists() then
+                table.insert(configs, "-DBLAS=MKL")
+                local mkl = package:dep("mkl"):fetch()
+                table.insert(configs, "-DINTEL_MKL_DIR=" .. path.directory(mkl.sysincludedirs[1]))
+            else
+                table.insert(configs, "-DBLAS=OpenBLAS")
+                envs.OpenBLAS_HOME = package:dep("openblas"):installdir()
+            end
+        end
+        envs.libuv_ROOT = package:dep("libuv"):installdir()
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        table.insert(configs, "-DCAFFE2_USE_MSVC_STATIC_RUNTIME=" .. (package:config("vs_runtime"):startswith("MT") and "ON" or "OFF"))
+        extracfg.envs = envs
+        cmake.install(package, configs, extracfg)
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            void test() {
+                auto a = torch::ones(3);
+                auto b = torch::tensor({1, 2, 3});
+                auto c = torch::dot(a, b);
+            }
+        ]]}, {configs = {languages = "c++14"}, includes = "torch/torch.h"}))
+    end)
+