Re: CreateProcess No such file or directory

[LIU Hao <lh_mouse@126.com>]

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在 2022/9/21 00:02, mizo 91 via Gcc-help 写道:
> Hello,
> 
> I'm having trouble compiling simple test program on windows 10 with long
> list of includes provided via '@response_file' argument
> 
> 

Greetings. mingw-w64 developer speaking.

As far as I can see, there are at least two issues about your report:


The first, obvious issue is that the error message is incorrect. The reason for that is, if we take 
a look at 'libiberty/pex-win32.c' we see the following:

   853   /* Create the child process.  */
   854   pid = win32_spawn (executable, (flags & PEX_SEARCH) != 0,
   855                      argv, env, dwCreationFlags, &si, &pi);
   856   if (pid == (pid_t) -1)
   857     pid = spawn_script (executable, argv, env, dwCreationFlags,
   858                         &si, &pi);
   859   if (pid == (pid_t) -1)
   860     {
   861       *err = ENOENT;
   862       *errmsg = "CreateProcess";
   863     }

We also notice this is the only place where `"CreateProcess"` appears as a sole part of an error 
message.

The cause of this issue is apparent: libiberty tries `win32_spawn`, and if for whatever reason it 
fails, it makes another attempt with `spawn_script`, and if it fails again, `*err` is always set to 
`ENOENT` i.e. `No such file or directory`, no matter why.


Since we are invoking 'as.exe' here, which is never a script, the first attempt must have failed. We 
can start 'gcc.exe' with a debugger. There are actually two calls to `CreateProcessA()`: one to 
'cc1.exe' and the other to 'as.exe'; the latter fails with `ERROR_INVALID_PARAMETER`.

So, the error happens, not because anything can't be found, but because the command line is too 
long. With your example, it contains a lot of `-include` arguments and takes ~44K characters, and is 
not valid. Windows only allows a single command line up to 32,767 characters, because the NT syscall 
uses a 16-bit length for a UTF-16 string which includes a null terminator.


-- 
Best regards,
LIU Hao

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