build.run: in BuildPlan.execute_local, always use LF line endings.

This way the files are written identically on *nix and Windows.

Fixes #732.

amaranth/build/run.py

@@ -84,8 +84,9 @@ class BuildPlan:
                 if dirname:
                     os.makedirs(dirname, exist_ok=True)
 
-                mode = "wt" if isinstance(content, str) else "wb"
-                with open(filename, mode) as f:
+                if isinstance(content, str):
+                    content = content.encode("utf-8")
+                with open(filename, "wb") as f:
                     f.write(content)
 
             if run_script:

docs/changes.rst

@@ -43,6 +43,7 @@ Toolchain changes
 
 .. currentmodule:: amaranth
 
+* Changed: text files are written with LF line endings on Windows, like on other platforms.
 * Added: ``debug_verilog`` override in :class:`build.TemplatedPlatform`.
 * Deprecated: use of mixed-case toolchain environment variable names, such as ``NMIGEN_ENV_Diamond`` or ``AMARANTH_ENV_Diamond``; use upper-case environment variable names, such as ``AMARANTH_ENV_DIAMOND``.
 * Removed: (deprecated in 0.3) :meth:`sim.Simulator.step`.