func TestReadWrite(t *testing.T) {
	// Test that we get the same data in a write-read roundtrip.

	// Write a symbol, a relocation, and an aux info.
	var buf bytes.Buffer
	w := dummyWriter(&buf)

	var s Sym
	s.SetABI(1)
	s.SetType(uint8(objabi.STEXT))
	s.SetFlag(0x12)
	s.SetSiz(12345)
	s.SetAlign(8)
	s.Write(w)

	var r Reloc
	r.SetOff(12)
	r.SetSiz(4)
	r.SetType(uint16(objabi.R_ADDR))
	r.SetAdd(54321)

		return
	}
	fmt.Fprintf(os.Stderr, "cmd/go: gccgo: %s\n", gccgoErr)
	base.SetExitStatus(2)
	base.Exit()
}

func (tools gccgoToolchain) gc(b *Builder, a *Action, archive string, importcfg, embedcfg []byte, symabis string, asmhdr bool, pgoProfile string, gofiles []string) (ofile string, output []byte, err error) {
	p := a.Package
	sh := b.Shell(a)
	objdir := a.Objdir
	out := "_go_.o"
	ofile = objdir + out
	gcargs := []string{"-g"}

		}
		need &^= needCompiledGoFiles
	}
	if need == 0 {
		// Nothing left to do.
		return nil
	}

	// Collect symbol ABI requirements from assembly.
	symabis, err := BuildToolchain.symabis(b, a, sfiles)
	if err != nil {
		return err
	}

	// Prepare Go import config.
	// We start it off with a comment so it can't be empty, so icfg.Bytes() below is never nil.

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			size: uint16(len(ldr.SymName(sym)) + 1), // + null terminator
			name: ldr.SymName(sym),
		}
		stlen += uint32(2 + ldstr.size) // 2 = sizeof ldstr.size
		symtab = append(symtab, lds)
		strtab = append(strtab, ldstr)

	}

	hdr.Lnsyms = int32(len(symtab))
	hdr.Lrldoff = hdr.Lsymoff + uint64(24*hdr.Lnsyms) // 24 = sizeof one symbol

	pclnState := ctxt.pclntab(containers)
	bench.Start("findfunctab")
	ctxt.findfunctab(pclnState, containers)
	bench.Start("dwarfGenerateDebugSyms")
	dwarfGenerateDebugSyms(ctxt)
	bench.Start("symtab")
	symGroupType := ctxt.symtab(pclnState)
	bench.Start("dodata")
	ctxt.dodata(symGroupType)
	bench.Start("address")
	order := ctxt.address()
	bench.Start("dwarfcompress")
	dwarfcompress(ctxt)
	bench.Start("layout")

// they appear in f.
//
// For compatibility with Go 1.0, Symbols omits the null symbol at index 0.
// After retrieving the symbols as symtab, an externally supplied index x
// corresponds to symtab[x-1], not symtab[x].
func (f *File) Symbols() ([]Symbol, error) {
	sym, _, err := f.getSymbols(SHT_SYMTAB)
	return sym, err
}

	testenv.WriteImportcfg(t, importcfgfile, nil, "runtime")

	// Compile, assemble and pack the Go and C code.
	runGo("tool", "asm", "-p=main", "-gensymabis", "-o", "symabis", "x.s")
	runGo("tool", "compile", "-importcfg="+importcfgfile, "-symabis", "symabis", "-p=main", "-o", "x1.o", "main.go")
	runGo("tool", "asm", "-p=main", "-o", "x2.o", "x.s")
	run(cc, append(cflags, "-c", "-o", "x3.o", "x.c")...)

	case "TEXT":
		p.asmText(operands)
	default:
		return false
	}
	return true
}

// symDefRef scans a line for potential text symbol definitions and
// references and writes symabis information to w.
//
// The symabis format is documented at
// cmd/compile/internal/ssagen.ReadSymABIs.
func (p *Parser) symDefRef(w io.Writer, word string, operands [][]lex.Token) {
	switch word {
	case "TEXT":

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