[release-branch.go1.10] cmd/link: treat cgo exported symbols as C symbols

Fixes #25827

Change-Id: I6736c3ac061ca32aac2eb68b01ba53a179d68cf4
Reviewed-on: https://go-review.googlesource.com/118076
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
(cherry picked from commit f861f66d1db9f1abcdf91fc54d0d84bd3f9e9310)
Reviewed-on: https://go-review.googlesource.com/126455
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/cmd/link/internal/ld/pcln.go b/src/cmd/link/internal/ld/pcln.go
index 8708924d92a2709b5b18f17e6e08859b106bf5d9..ed1b523b4edf4bec57b0fd45c58b994c7da97ef6 100644 (file)
--- a/src/cmd/link/internal/ld/pcln.go
+++ b/src/cmd/link/internal/ld/pcln.go
@@ -11,6 +11,7 @@ import (
        "log"
        "os"
        "path/filepath"
+       "strings"
 )
 
 // iteration over encoded pcdata tables.
@@ -162,13 +163,15 @@ func renumberfiles(ctxt *Link, files []*sym.Symbol, d *sym.Pcdata) {
        *d = out
 }
 
-// onlycsymbol reports whether this is a cgo symbol provided by the
-// runtime and only used from C code.
+// onlycsymbol reports whether this is a symbol that is referenced by C code.
 func onlycsymbol(s *sym.Symbol) bool {
        switch s.Name {
        case "_cgo_topofstack", "_cgo_panic", "crosscall2":
                return true
        }
+       if strings.HasPrefix(s.Name, "_cgoexp_") {
+               return true
+       }
        return false
 }