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cmd/go, cmd/link: build c-archive as position independent on ELF

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This permits people to use -buildmode=c-archive to produce an archive
file that can be included in a PIE or shared library.

Change-Id: Ie340ee2f08bcff4f6fd1415f7d96d51ee3a7c9a1
Reviewed-on: https://go-review.googlesource.com/24180
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Ian Lance Taylor 2016-06-16 12:59:09 -07:00
parent dc9755c2a2
commit d92a3606f5
6 changed files with 101 additions and 9 deletions
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15
src/cmd/link/internal/x86/asm.go
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@ -51,8 +51,19 @@ func addcall(ctxt *ld.Link, s *ld.Symbol, t *ld.Symbol) {
}
func gentext(ctxt *ld.Link) {
if !ld.DynlinkingGo() && ld.Buildmode != ld.BuildmodePIE && ld.Buildmode != ld.BuildmodeCShared {
return
if ld.DynlinkingGo() {
// We need get_pc_thunk.
} else {
switch ld.Buildmode {
case ld.BuildmodeCArchive:
if !ld.Iself {
return
}
case ld.BuildmodePIE, ld.BuildmodeCShared:
// We need get_pc_thunk.
default:
return
}
}
// Generate little thunks that load the PC of the next instruction into a register.