[Bug binutils/30873] [RISC-V] On the failure of ".option arch, +/-" caused by implicit derivation of Zc extension

[nelsonc1225 at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30873

Nelson Chu <nelsonc1225 at sourceware dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |nelsonc1225 at sourceware dot 
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--- Comment #1 from Nelson Chu <nelsonc1225 at sourceware dot org> ---
Yeah, if we just remove zca from .option arch, then zcd and zcf will still
imply it back later.  So that's why the remove orders cause different results. 
I have sent a patch that tried to clarify this behaviors,
https://inbox.sourceware.org/binutils/CAPpQWtD=i=AVrc=N-=MhvEFF7NZs4U3Sanawzh98YGx+QjqnHQ@mail.gmail.com/T/#t

Please see the details there, though it still discussing.  And sorry that I
lost this bugzilla, hope that won't too late to reply...

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