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Re: patch8.diff updated Was: Re: GCC's -fsplit-stack disturbing Mach's vm_allocate
- From: Ian Lance Taylor <iant at google dot com>
- To: svante dot signell at gmail dot com
- Cc: Samuel Thibault <samuel dot thibault at gnu dot org>, Thomas Schwinge <thomas at codesourcery dot com>, gcc-patches <gcc-patches at gcc dot gnu dot org>, bug-hurd <bug-hurd at gnu dot org>, Roland McGrath <roland at hack dot frob dot com>
- Date: Fri, 16 May 2014 06:20:18 -0700
- Subject: Re: patch8.diff updated Was: Re: GCC's -fsplit-stack disturbing Mach's vm_allocate
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- References: <1399018692 dot 8487 dot 7 dot camel at PackardBell-PC> <20140502095753 dot GC6577 at type> <20140502100027 dot GD6577 at type> <1399027556 dot 8487 dot 12 dot camel at PackardBell-PC> <20140502105234 dot GM6577 at type> <1399363609 dot 13092 dot 29 dot camel at G3620 dot my dot own dot domain> <20140506125157 dot GH5788 at type dot bordeaux dot inria dot fr> <1399381520 dot 13092 dot 67 dot camel at G3620 dot my dot own dot domain> <20140506130755 dot GL5788 at type dot bordeaux dot inria dot fr> <1399382738 dot 13092 dot 70 dot camel at G3620 dot my dot own dot domain> <20140506132605 dot GD1010 at type dot bordeaux dot inria dot fr> <1399450727 dot 13092 dot 106 dot camel at G3620 dot my dot own dot domain> <1400227385 dot 10012 dot 98 dot camel at G3620 dot my dot own dot domain>
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>.
Ian