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cmd/cgo/doc: mention -U as allowed flag
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@ -55,7 +55,7 @@ For example:
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The default pkg-config tool may be changed by setting the PKG_CONFIG environment variable.
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For security reasons, only a limited set of flags are allowed, notably -D, -I, and -l.
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For security reasons, only a limited set of flags are allowed, notably -D, -U, -I, and -l.
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To allow additional flags, set CGO_CFLAGS_ALLOW to a regular expression
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matching the new flags. To disallow flags that would otherwise be allowed,
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set CGO_CFLAGS_DISALLOW to a regular expression matching arguments
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