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cmd/cgo: ensure GCC does not use ANSI escape sequences in errors
cgo parses GCC’s error messages to classify C identifiers referenced from Go programs (are they integer constants? type names?). If GCC tries to colorize its errors, cgo can’t figure out what GCC is saying. GCC avoids escape sequences in this scenario by default, but the default behavior can be overridden in at least two places: - The user can set `CGO_COPTS=-fdiagnostics-color`. - Whoever compiled GCC can configure GCC itself to always colorize output. The most reliable way to ensure that GCC doesn’t colorize output is to append `-fdiagnostics-color=never` to the GCC command line; do so. Fixes #40415 Change-Id: Id4bdf8d92fac8b038340b4264f726e8fe38875b4 Reviewed-on: https://go-review.googlesource.com/c/go/+/248398 Run-TryBot: Ian Lance Taylor <firstname.lastname@example.org> TryBot-Result: Gobot Gobot <email@example.com> Reviewed-by: Ian Lance Taylor <firstname.lastname@example.org>
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