The -W (capital-W) option shall be reserved for vendor options.

If optstring contains W followed by a semicolon ( ; ), then -W foo is treated as the long option --foo. (The -W option is reserved by POSIX.2 for implementation extensions.)

有人能夠以更清晰的方式解釋上述句子(直截了當)并解釋為什么這樣的選項有用嗎？

上面的語句讓我感到困惑,因為我認為getopt(不是getopt_long,getopt_long_only)只能理解短選項.

解決方法:

Long options can also be specified using a special POSIX argument

format (one that I highly discourage). This form of entry is enabled

by placing a “W;” (yes, ‘W’ then a semi-colon) in the valid option

string. This causes getopt to treat the name following the “-W” as the

name of the long option. For example, “-W outputdir=foo” would be

equivalent to “–outputdir=foo”. The name can immediately follow the

“-W” like so: “-Woutputdir=foo”. Option arguments are handled

identically to normal long options. If a string follows the “-W” that

does not represent a valid long option, then getopt() returns ‘W’ and

the caller must decide what to do. Otherwise getopt() returns a long

option value as described below.

標簽：c-3,linux,unix,command-line

來源： https://codeday.me/bug/20190729/1569495.html

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