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cmd/link: only adjust pagezero for iOS on darwin/arm64

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The new pagezero_size introduced by CL 72730 breaks
on 32-bit systems, since it is 2³². Restrict the change to
darwin/arm64, since it is intended for iOS only.

We could plausibly allow GOARCH=amd64 as well, but
without a compelling reason, changing the zero page size
doesn't seem worth the risk.

Change-Id: I5d6adcbaff8d0e5b169ff13512f188332cc7ed9a
Reviewed-on: https://go-review.googlesource.com/73250
Run-TryBot: Russ Cox <rsc@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Russ Cox 2017-10-24 21:14:39 -04:00
parent e7fed7fa35
commit 4a5b99c3a8
1 changed files with 7 additions and 4 deletions
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5
src/cmd/link/internal/ld/lib.go
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@ -1105,10 +1105,13 @@ func (ctxt *Link) hostlink() {
switch ctxt.BuildMode {
case BuildModeExe:
if ctxt.HeadType == objabi.Hdarwin {
if ctxt.Arch.Family == sys.ARM64 {
// __PAGEZERO segment size determined empirically.
// XCode 9.0.1 successfully uploads an iOS app with this value.
// Also works for macOS apps.
argv = append(argv, "-Wl,-pagezero_size,100000000")
} else {
argv = append(argv, "-Wl,-pagezero_size,4000000")
}
}
case BuildModePIE:
// ELF.