fix muslcc

packages/m/muslcc/xmake.lua

@@ -51,6 +51,12 @@ package("muslcc")
     on_install("@windows", "@linux", "@macosx", function (package)
         os.tryrm("usr") -- remove soft link
         os.vcp("*", package:installdir())
+        if package:is_plat("macosx") then
+            -- fix missing libisl.22.dylib
+            if not os.isfile("/usr/local/opt/isl/lib/libisl.22.dylib") then
+                os.vcp("/usr/local/opt/isl/lib/libisl.21.dylib", path.join(package:installdir("lib"), "libisl.22.dylib"))
+            end
+        end
     end)
 
     on_test(function (package)
@@ -67,5 +73,7 @@ package("muslcc")
         if gcc and is_host("windows") then
             gcc = gcc .. ".exe"
         end
-        os.vrunv(gcc, {"--version"})
+        local file = os.tmpfile() .. ".c"
+        io.writefile(file, "int main(int argc, char** argv) {return 0;}")
+        os.vrunv(gcc, {"-c", file})
     end)