Further analysis suggests that missing make.exe in PATH is the root cause of the reported error message. As make.exe is not part of GCC, but is needed in -flto=n, user must make sure that make.exe be accessible in PATH.
Further analysis suggests that missing make.exe in PATH is the root cause of the reported error message. As make.exe is not part of GCC, but is needed in -flto=n, user must make sure that make.exe be accessible in PATH.