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Fangrui Song 25daa6d670 [llvm-readelf/llvm-readobj] Remove one-dash long options
llvm-readelf is a user-facing tool which emulates GNU readelf. Remove one-dash
long options which are not recognized by GNU style `getopt_long`. This ensures
long options cannot collide with grouped short options.

Note: the documentation (D63719)/help messages have recommended the double-dash
forms since LLVM 9.0.0.
llvm-readobj is intended as an internal tool which has some flexibility.
llvm-readelf/llvm-readobj use the same option parsing code and llvm-readobj's
one-dash long options aren't used after test migration.

Differential Revision: https://reviews.llvm.org/D106037
2021-07-16 12:03:08 -07:00
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