add:llvm-arm (#3876)

packages/l/llvm-arm/xmake.lua

@@ -0,0 +1,32 @@
+package("llvm-arm")
+
+    set_kind("toolchain")
+    set_homepage("https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm")
+    set_description("A project dedicated to building LLVM toolchain for 32-bit Arm embedded targets.")
+
+    if is_host("windows") then
+        set_urls("https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm/releases/download/release-$(version)/LLVMEmbeddedToolchainForArm-$(version)-Windows-x86_64.zip")
+        add_versions("17.0.1", "0ac5aa29d53227bf71c546f7426dde302ad71f064dcae498c5eec0d99ede6739")
+    elseif is_host("linux") then
+        if os.arch():find("arm64.*") then
+            set_urls("https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm/releases/download/release-$(version)/LLVMEmbeddedToolchainForArm-$(version)-Linux-AArch64.tar.xz")
+            add_versions("17.0.1", "becd922bec5d5e5683d824fa91ebabe5e0e286b97e209ebd3398f56f5b9ef4ed")
+        else
+            set_urls("https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm/releases/download/release-$(version)/LLVMEmbeddedToolchainForArm-$(version)-Linux-x86_64.tar.xz")
+            add_versions("17.0.1", "eb7bff945d3c19589ab596a9829de6f05f86b73f52f80da253232360c99ea68f")
+        end
+
+    end
+
+    on_install("@windows", "@linux", function (package)
+        os.vcp("*", package:installdir())
+    end)
+
+    on_test(function (package)
+        local clang = "clang"
+        if clang and is_host("windows") then
+            clang = clang .. ".exe"
+        end
+        os.vrunv(clang, {"--version"})
+    end)
+