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// Copyright 2018 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
// syz-make provides information required to build native code for the Makefile.
package main
import (
"fmt"
"os"
"runtime"
"strconv"
"strings"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/sys/targets"
)
func main() {
vars, err := impl()
if err != nil {
fmt.Printf("export SYZERROR=%v\n", err)
os.Exit(1)
}
for _, v := range vars {
fmt.Printf("export %v=%v\\n", v.Name, v.Val)
}
}
type Var struct {
Name string
Val string
}
func impl() ([]Var, error) {
hostOS := or(os.Getenv("HOSTOS"), runtime.GOOS)
hostArch := or(os.Getenv("HOSTARCH"), runtime.GOARCH)
targetOS := or(os.Getenv("TARGETOS"), hostOS)
targetArch := or(os.Getenv("TARGETARCH"), hostArch)
targetVMArch := or(os.Getenv("TARGETVMARCH"), targetArch)
target := targets.Get(targetOS, targetArch)
if target == nil {
return nil, fmt.Errorf("unknown target %v/%v", targetOS, targetArch)
}
parallelism := runtime.NumCPU()
if mem := osutil.SystemMemorySize(); mem != 0 {
// Ensure that we have at least 1GB per Go compiler/linker invocation.
// Go compiler/linker can consume significant amount of memory
// (observed to consume at least 600MB). See #1276 for context.
// And we have parallelization both on make and on go levels,
// this can severe oversubscribe RAM.
// Note: the result can be significantly lower than the CPU number,
// but this is fine because Go builds/tests are parallelized internally.
memLimit := int(mem / (1 << 30))
for parallelism > 1 && parallelism*parallelism > memLimit {
parallelism--
}
}
vars := []Var{
{"BUILDOS", runtime.GOOS},
{"NATIVEBUILDOS", target.BuildOS},
{"HOSTOS", hostOS},
{"HOSTARCH", hostArch},
{"TARGETOS", targetOS},
{"TARGETARCH", targetArch},
{"TARGETVMARCH", targetVMArch},
{"CC", target.CCompiler},
{"ADDCFLAGS", strings.Join(target.CFlags, " ")},
{"NCORES", strconv.Itoa(parallelism)},
{"EXE", target.ExeExtension},
{"NATIVEBUILDOS", target.BuildOS},
{"NO_CROSS_COMPILER", target.BrokenCompiler},
}
return vars, nil
}
func or(s1, s2 string) string {
if s1 != "" {
return s1
}
return s2
}
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