add aarch64-linux (static) cross

cabal.project

@@ -36,6 +36,17 @@ if os(windows)
   constraints: time ^>=1.14
   allow-newer: *:time
 
+constraints: any.text source
+-- Depending on C++ for just so slightly faster utf8 parsing is a bit annoying
+-- especially as it brings in all kinds of complications for GHC.
+package text
+  flags: -simdutf
+
+-- formatting (>= 7.2) allows us do drop double-conversion (which again is one
+-- of the offending c++ dependencies)
+package formatting
+  flags: +no-double-conversion
+
 tests: True
 
 test-show-details: direct

flake.nix

@@ -57,8 +57,8 @@
 
           # we also want cross compilation to windows on linux (and only with default compiler).
           crossPlatforms = p:
-            lib.optional (system == "x86_64-linux" && config.compiler-nix-name == defaultCompiler)
-            p.mingwW64;
+            lib.optionals (system == "x86_64-linux" && config.compiler-nix-name == defaultCompiler)
+            [ p.mingwW64 p.aarch64-multiplatform-musl ];
 
           # CHaP input map, so we can find CHaP packages (needs to be more
           # recent than the index-state we set!). Can be updated with