Add a meson.cross file for pyodide cross-build.

Author: oscarbenjamin

bin/emscripten.meson.cross

@@ -0,0 +1,15 @@
+# compiler paths are omitted intentionally so pyodide-build can override them
+# with its pywasmcross wrappers.
+[binaries]
+exe_wrapper = 'node'
+pkgconfig = 'pkg-config'
+
+[properties]
+needs_exe_wrapper = true
+skip_sanity_check = true
+
+[host_machine]
+system = 'emscripten'
+cpu_family = 'wasm32'
+cpu = 'wasm'
+endian = 'little'

pyproject.toml

@@ -193,4 +193,4 @@ LDFLAGS = "-L$(pwd)/wasm-library-dir/lib -lflint -lmpfr -lgmp $LDFLAGS"
 
 [tool.cibuildwheel.pyodide.config-settings]
 build-dir = "flint_wasm_build"
-setup-args = ["-Dflint_version_check=false"]
+setup-args = ["--cross-file=$PWD/bin/emscripten.meson.cross", "-Dflint_version_check=false"]