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990431c1e3
The --with-gcc-arch flag is used to specify the value used for
--march and --mtune [1], therefore it does not make sense to fail the
evaluation simply because it's not enumerated by us. However,
it's necessary to specify --without-gcc-arch, otherwise the config
script will guess the values and lead to incompatible / non-determinstic
artifacts.
[1]
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