libgo patch committed, RFA for GCC 8 release branch: Solaris assembler support

[Ian Lance Taylor]

This libgo patch fixes the go tool to use Solaris assembler syntax for
the buildid file.  The Solaris assembler uses a different syntax for
section directives.  This is https://golang.org/cl/109140 ported over
to gccgo.  This fixes PR 85429.  Bootstrapped and ran Go tests on
x86_64-pc-linux-gnu and SPARC/Solaris 11 (there are other unrelated
failures on SPARC Solaris).  Committed to mainline.

Release managers: OK for GCC 8 branch?

Ian

Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE     (revision 259531)
+++ gcc/go/gofrontend/MERGE     (working copy)
@@ -1,4 +1,4 @@
-7b37b9c3f9338a1387ee1e2301de89c3d2d87d2b
+32861fd0acb0f3232f66be4791388b27e71c9990
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: libgo/go/cmd/go/internal/work/buildid.go
===================================================================
--- libgo/go/cmd/go/internal/work/buildid.go    (revision 259359)
+++ libgo/go/cmd/go/internal/work/buildid.go    (working copy)
@@ -309,7 +309,11 @@ func (b *Builder) gccgoBuildIDELFFile(a
        sfile := a.Objdir + "_buildid.s"
 
        var buf bytes.Buffer
-       fmt.Fprintf(&buf, "\t"+`.section .go.buildid,"e"`+"\n")
+       if cfg.Goos != "solaris" {
+               fmt.Fprintf(&buf, "\t"+`.section .go.buildid,"e"`+"\n")
+       } else {
+               fmt.Fprintf(&buf, "\t"+`.section ".go.buildid",#exclude`+"\n")
+       }
        fmt.Fprintf(&buf, "\t.byte ")
        for i := 0; i < len(a.buildID); i++ {
                if i > 0 {
@@ -322,8 +326,10 @@ func (b *Builder) gccgoBuildIDELFFile(a
                fmt.Fprintf(&buf, "%#02x", a.buildID[i])
        }
        fmt.Fprintf(&buf, "\n")
-       fmt.Fprintf(&buf, "\t"+`.section .note.GNU-stack,"",@progbits`+"\n")
-       fmt.Fprintf(&buf, "\t"+`.section 
.note.GNU-split-stack,"",@progbits`+"\n")
+       if cfg.Goos != "solaris" {
+               fmt.Fprintf(&buf, "\t"+`.section 
.note.GNU-stack,"",@progbits`+"\n")
+               fmt.Fprintf(&buf, "\t"+`.section 
.note.GNU-split-stack,"",@progbits`+"\n")
+       }
 
        if cfg.BuildN || cfg.BuildX {
                for _, line := range bytes.Split(buf.Bytes(), []byte("\n")) {