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compileopts: fix race condition #4243

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Merged
merged 1 commit into from
Apr 27, 2024
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compileopts: fix race condition #4243

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3 changes: 2 additions & 1 deletion compileopts/config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,8 @@ func (c *Config) GOARM() string {

// BuildTags returns the complete list of build tags used during this build.
func (c *Config) BuildTags() []string {
tags := append(c.Target.BuildTags, []string{
tags := append([]string(nil), c.Target.BuildTags...) // copy slice (avoid a race)
tags = append(tags, []string{
"tinygo", // that's the compiler
"purego", // to get various crypto packages to work
"math_big_pure_go", // to get math/big to work
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