kbuild: simulate force-renaming on Windows

Calling rename() when a file with the target name exists already fails
on Windows.

Let's simply delete the target file, if it exists. This is usually a
dangerous thing as it leaves time between deleting and renaming, during
which (theoretically) another thread or process could have created the
same file, and the rename() would fail again. Practically, we are
talking about the kbuild system used to configure the build, where it
does not matter, as we do not expect any other thread or process to
interfere with the configuration files.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 8f4ecbd33..1d77aefb7 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -571,15 +571,24 @@ int conf_write(const char *name)
         fclose(out);
         if (out_h) {
                 fclose(out_h);
+#ifdef __MINGW32__
+                unlink("include/autoconf.h");
+#endif
                 rename(".tmpconfig.h", "include/autoconf.h");
         }
         if (!name || basename != conf_def_filename) {
                 if (!name)
                         name = conf_def_filename;
                 sprintf(tmpname, "%s.old", name);
+#ifdef __MINGW32__
+                unlink(tmpname);
+#endif
                 rename(name, tmpname);
         }
         sprintf(tmpname, "%s%s", dirname, basename);
+#ifdef __MINGW32__
+        unlink(tmpname);
+#endif
         if (rename(newname, tmpname))
                 return 1;