fix: support cmake command mode (#4705)

docs/project/changelog.md

@@ -16,6 +16,8 @@ myst:
 
 ## Unreleased
 
+- {{ Fix }} Pass through `-E` (command mode) arguments in CMake wrapper {pr}`4705`.
+
 - {{ Fix }} Fix exception handling in dynamic linking of int64 functions {pr}`4698`.
 
 - {{ Enhancement }} `str(jsproxy)` has been adjusted to not raise an error if

pyodide-build/pyodide_build/pywasmcross.py

@@ -479,7 +479,7 @@ def handle_command_generate_args(  # noqa: C901
         return line
     elif cmd == "cmake":
         # If it is a build/install command, or running a script, we don't do anything.
-        if "--build" in line or "--install" in line or "-P" in line:
+        if "--build" in line or "--install" in line or "-P" in line or "-E" in line:
             return line
 
         flags = get_cmake_compiler_flags()