paulwalker-arm added a comment. Rather than adding connivence options after the fact what about allowing `-march=` to be specified multiple times? The first must be the usual format with later ones required to start with `+`. The defined parsing behaviour would be as if there was a single `-march` instance positioned at the first occurrence but containing the value of all instances when combined from left to right. For example `-march=armv8.4-a ...... march=+nofp16` or perhaps `+=` syntax like `-march=armv8.4-a ...... march+=nofp16+nosve` is more intuitive?
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