posix_spawn issues on i686

[Jeremy Drake]

On Mon, 10 Jan 2022, Jeremy Drake wrote:

> From https://github.com/msys2/MSYS2-packages/issues/2801
>
> MSYS2 recently rebuilt GNU make 4.3, and I found that after rebuilding, it
> broke rather horribly on i686, where any attempt to run a command resulted
> in "Invalid argument" errors.  Some debugging revealed that rebuilding
> make resulted in it using posix_spawn now instead of vfork.  Passing
> --disable-posix-spawn to make's configure script results in a working i686
> make.
>

> Can you create a simple, self-contained testcase in plain C?


Sorry, I am not subscribed to the list so don't have the message to reply
to for threading purposes, but attached please find a C reproducer that
works on x86_64 but fails on i686.  The particular issue seems to be the
POSIX_SPAWN_RESETIDS flag - not setting that allows i686 to succeed too.
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