cmd/go: document GOPPC64 environment variable

Change-Id: I2d2c02eec4ac6eca218fa5334d32650c1620692c Reviewed-on: https://go-review.googlesource.com/c/go/+/329689 Trust: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Carlos Eduardo Seo <carlos.seo@linaro.org>
jproberts · Jun 21, 2021 · 3f9ec83 · 3f9ec83
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diff --git a/src/cmd/go/alldocs.go b/src/cmd/go/alldocs.go
diff --git a/src/cmd/go/internal/help/helpdoc.go b/src/cmd/go/internal/help/helpdoc.go
@@ -598,6 +598,9 @@ Architecture-specific environment variables:
 	GOMIPS64
 		For GOARCH=mips64{,le}, whether to use floating point instructions.
 		Valid values are hardfloat (default), softfloat.
+	GOPPC64
+		For GOARCH=ppc64{,le}, the target ISA (Instruction Set Architecture).
+		Valid values are power8 (default), power9.
 	GOWASM
 		For GOARCH=wasm, comma-separated list of experimental WebAssembly features to use.
 		Valid values are satconv, signext.