support ispc compiler

tests/projects/other/ispc/.gitignore

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+# Xmake cache
+.xmake/
+build/
+
+# MacOS Cache
+.DS_Store
+
+

tests/projects/other/ispc/src/main.cpp

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+#include "test_ispc.h"
+
+using namespace ispc;
+
+int main(int argc, char *argv[])
+{
+    test_ispc();
+}

tests/projects/other/ispc/src/test.ispc

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+export void test_ispc() {}

tests/projects/other/ispc/xmake.lua

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+add_rules("mode.debug", "mode.release")
+
+target("test")
+    set_kind("binary")
+    add_rules("utils.ispc", {header_extension = "_ispc.h"})
+    set_values("ispc.flags", "--target=host")
+    add_files("src/*.ispc")
+    add_files("src/*.cpp")

xmake/rules/utils/ispc/ispc.lua

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+rule("utils.ispc")
+    set_extensions(".ispc")
+
+    on_load(function (target)
+        local header_outputdir = path.join(target:autogendir(), "ispc_headers")
+        os.mkdir(header_outputdir)
+        target:add("includedirs", header_outputdir, {public = true})
+    end)
+    before_buildcmd_file(function (target, batchcmds, sourcefile_ispc, opt)
+        import("lib.detect.find_tool")
+        local ispc = find_tool("ispc")
+        assert(ispc, "ispc not found!")
+
+        local flags = {}
+        if target:values("ispc.flags") then
+            table.join2(flags, target:values("ispc.flags"))
+        end
+
+        if target:get("symbols") == "debug"  then
+            table.insert(flags, "-g")
+        end
+
+        if target:get("optimize") == "none" then
+            table.insert(flags, "-O0")
+        elseif target:get("optimize") == "fast" then
+            table.insert(flags, "-O2")
+        elseif target:get("optimize") == "faster" or target:get("optimize") == "fastest" then
+            table.insert(flags, "-O3")
+        elseif target:get("optimize") == "smallest" then
+            table.insert(flags, "-O1")
+        end
+
+        if target:get("warnings") == "none" then
+            table.insert(flags, "--woff")
+        elseif target:get("warnings") == "error" then
+            table.insert(flags, "--werror")
+        end
+
+        if not target:is_plat("windows") then
+            table.insert(flags, "--pic")
+        end
+
+        local obj_extension = ".o"
+        if target:is_plat("windows") then
+            obj_extension = ".obj"
+        end
+
+        local headersdir = path.join(target:autogendir(), "ispc_headers")
+        local objectdir = path.join(target:autogendir(), "ispc_objs")
+        local objectfile = path.join(objectdir, path.filename(sourcefile_ispc) .. obj_extension)
+        batchcmds:mkdir(objectdir)
+
+        local headersfile
+        local header_extension = target:extraconf("rules", "utils.ispc", "header_extension")
+        if header_extension then
+            headersfile = path.join(headersdir, path.basename(sourcefile_ispc) .. header_extension)
+        else
+            headersfile = path.join(headersdir, path.filename(sourcefile_ispc) .. ".h")
+        end
+
+        table.insert(flags, "-o")
+        table.insert(flags, path(objectfile))
+        table.insert(flags, "-h")
+        table.insert(flags, path(headersfile))
+        table.insert(flags, path(sourcefile_ispc))
+        batchcmds:show_progress(opt.progress, "${color.build.object}compiling %s", sourcefile_ispc)
+        batchcmds:vrunv(ispc.program, flags)
+
+        table.insert(target:objectfiles(), objectfile)
+
+        batchcmds:add_depfiles(sourcefile_ispc, headersfile)
+        batchcmds:set_depmtime(os.mtime(objectfile))
+        batchcmds:set_depcache(target:dependfile(objectfile))
+    end)