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[release-branch.go1] cmd/cgo: use 1 as last entry for __cgodebug_data

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««« backport aeaab9df5600
cmd/cgo: use 1 as last entry for __cgodebug_data
        LLVM-based gcc will place all-zero data in a zero-filled
        section, but our debug/macho can't handle that.
        Fixes #3821.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6444049

»»»
This commit is contained in:
Shenghou Ma 2012-09-22 05:54:22 +10:00
parent ed3e546000
commit 82de010886
1 changed files with 6 additions and 1 deletions
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7
src/cmd/cgo/gcc.go
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@ -508,7 +508,12 @@ func (p *Package) loadDWARF(f *File, names []*Name) {
fmt.Fprintf(&b, "\t0,\n") fmt.Fprintf(&b, "\t0,\n")
} }
} }
fmt.Fprintf(&b, "\t0\n") // for the last entry, we can not use 0, otherwise
// in case all __cgodebug_data is zero initialized,
// LLVM-based gcc will place the it in the __DATA.__common
// zero-filled section (our debug/macho doesn't support
// this)
fmt.Fprintf(&b, "\t1\n")
fmt.Fprintf(&b, "};\n") fmt.Fprintf(&b, "};\n")
d, bo, debugData := p.gccDebug(b.Bytes()) d, bo, debugData := p.gccDebug(b.Bytes())