Merge pull request #599 from aofei/sigsetjmp

ssa: fix `Builder.Sigsetjmp` for Linux

internal/build/build.go

@@ -20,6 +20,7 @@ import (
 	"debug/macho"
 	"fmt"
 	"go/ast"
+	"go/build"
 	"go/constant"
 	"go/token"
 	"go/types"
@@ -135,7 +136,12 @@ func Do(args []string, conf *Config) {
 
 	llssa.Initialize(llssa.InitAll)
 
-	prog := llssa.NewProgram(nil)
+	target := &llssa.Target{
+		GOOS:   build.Default.GOOS,
+		GOARCH: build.Default.GOARCH,
+	}
+
+	prog := llssa.NewProgram(target)
 	sizes := prog.TypeSizes
 	dedup := packages.NewDeduper()
 	dedup.SetPreload(func(pkg *types.Package, files []*ast.File) {

ssa/eh.go

@@ -63,7 +63,11 @@ func (b Builder) AllocaSigjmpBuf() Expr {
 }
 
 func (b Builder) Sigsetjmp(jb, savemask Expr) Expr {
-	fn := b.Pkg.cFunc("sigsetjmp", b.Prog.tySigsetjmp())
+	fname := "sigsetjmp"
+	if b.Prog.target.GOOS == "linux" {
+		fname = "__sigsetjmp"
+	}
+	fn := b.Pkg.cFunc(fname, b.Prog.tySigsetjmp())
 	return b.Call(fn, jb, savemask)
 }
 

ssa/package.go

@@ -19,6 +19,7 @@ package ssa
 import (
 	"go/token"
 	"go/types"
+	"runtime"
 	"strconv"
 	"unsafe"
 
@@ -203,7 +204,10 @@ type Program = *aProgram
 // NewProgram creates a new program.
 func NewProgram(target *Target) Program {
 	if target == nil {
-		target = &Target{}
+		target = &Target{
+			GOOS:   runtime.GOOS,
+			GOARCH: runtime.GOARCH,
+		}
 	}
 	ctx := llvm.NewContext()
 	td := target.targetData() // TODO(xsw): target config