support clang-cl asan

scripts/env/find_msvc.lua

@@ -257,6 +257,14 @@ local function ucrtpath(arch, optimize)
     return redist
 end
 
+local function llvmpath()
+    local path = installpath().."/VC/Tools/Llvm/x64/lib/clang/"
+    for p in fs.pairs(path) do
+        local version = p:filename():string()
+        return path .. version .."/lib/windows/"
+    end
+end
+
 return {
     installpath = installpath,
     toolspath = toolspath,
@@ -265,5 +273,6 @@ return {
     binpath = binpath,
     vcrtpath = vcrtpath,
     ucrtpath = ucrtpath,
-    findwinsdk = findwinsdk
+    findwinsdk = findwinsdk,
+    llvmpath = llvmpath,
 }

scripts/env/msvc.lua

@@ -106,5 +106,6 @@ end
 m.binpath = find_msvc.binpath
 m.vcrtpath = find_msvc.vcrtpath
 m.ucrtpath = find_msvc.ucrtpath
+m.llvmpath = find_msvc.llvmpath
 
 return m

scripts/writer.lua

@@ -707,10 +707,12 @@ function GEN.msvc_copydll(attribute, name)
             end
         end
     elseif attribute.type == "asan" then
-        local inputdir = msvc.binpath(archalias)
         local filename = ("clang_rt.asan_dynamic-%s.dll"):format(
             attribute.arch == "x86_64" and "x86_64" or "i386"
         )
+        local inputdir = globals.cc == "clang-cl"
+            and msvc.llvmpath()
+            or msvc.binpath(archalias)
         for _, outputdir in ipairs(attributeOutputs) do
             inputs[#inputs+1] = fsutil.join(inputdir, filename)
             outputs[#outputs+1] = fsutil.join(outputdir, filename)