A relink killed between writing <output>.tmp and renaming it left that
file behind, and every later relink of the output then fell back to the
in-place write, bringing back the failure on a running build. The
temporary file is now created under a new name beside the output with
O_CREAT | O_EXCL and the previous permission bits, and written through
that descriptor, so a file left by an earlier run never blocks a
replacement and is never touched.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
The MinGW CRT delivers argv to main as ANSI code page bytes, and every narrow string became a filesystem path through the same code page, so a game in a directory with characters outside the code page failed to open (#2692). Read the command line as Unicode (wmain via -municode), keep paths as UTF-8 strings, convert at the filesystem boundaries through Io::NativePath and Io::Utf8Path, and run the --autorun output through CreateProcessW.
(cherry picked from commit 30a5181f8a)
