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

From: Ian Lance Taylor
Subject: Re: patch8.diff updated Was: Re: GCC's -fsplit-stack disturbing Mach's vm_allocate
Date: Fri, 16 May 2014 06:20:18 -0700

On Fri, May 16, 2014 at 1:03 AM, Svante Signell
<svante.signell@gmail.com> wrote:
> 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.

On GNU/Linux SYS_FCNTL is defined by the generated file sysinfo.go,
because SYS_fcntl is defined by <syscall.h>.


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