patch8.diff updated Was: Re: GCC's -fsplit-stack disturbing Mach's vm_allocate

[Svante Signell]

On Wed, 2014-05-07 at 10:18 +0200, Svante Signell wrote:
> On Tue, 2014-05-06 at 15:26 +0200, Samuel Thibault wrote:

Attached is an updated patch8.diff. Arch specific code to
src/libgo/mksysinfo.sh has been added, now other systems are not
affected by the patch except the SYS_FCNTL part.

For that part of the patch without it the build on GNU/Hurd fails. On
the other hand SYS_FCNTL is not defined for e.g. GNU/Linux either. This
is used in gcc-4.9-4.9.0/src/libgo/go/net/fd_unix.go:
func dupCloseOnExec(fd int) (newfd int, err error) {
if atomic.LoadInt32(&tryDupCloexec) == 1 && syscall.F_DUPFD_CLOEXEC!=0 {
r0, _, e1 := syscall.Syscall(syscall.SYS_FCNTL, uintptr(fd),
syscall.F_DUPFD_CLOEXEC, 0)

It is yet unknown how the build succeeds on Linux without the SYS_FCNTL
being defined? Maybe any the conditions above are not met. 
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