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builder: suggest GOTOOLCHAIN and -go-compatibility when the host Go is too new #5643

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builder: suggest GOTOOLCHAIN and -go-compatibility when the host Go is too new #5643

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7 changes: 7 additions & 0 deletions builder/config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,13 @@ func NewConfig(options *compileopts.Options) (*compileopts.Config, error) {
if gorootMajor != 1 || gorootMinor < minorMin || gorootMinor > minorMax {
// Note: when this gets updated, also update the Go compatibility matrix:
// https://github.com/tinygo-org/tinygo-site/blob/dev/content/docs/reference/go-compat-matrix.md
if gorootMajor == 1 && gorootMinor > minorMax {
// A too-new Go toolchain is the common case right after a Go
// release: point at Go's own toolchain switching, which lets
// the user build with a supported toolchain without
// downgrading their installation.
return nil, fmt.Errorf("requires go version 1.%d through 1.%d, got go%d.%d (to use a supported toolchain without downgrading, set GOTOOLCHAIN=go1.%d.x; to skip this check, use -go-compatibility=false)", minorMin, minorMax, gorootMajor, gorootMinor, minorMax)
}
return nil, fmt.Errorf("requires go version 1.%d through 1.%d, got go%d.%d", minorMin, minorMax, gorootMajor, gorootMinor)
}
}
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