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--a Generate ANSI standard C output code, i.e., function prototypes.
--B Generate code for Binary Search.
--c Generate comparison code using strncmp rather than strcmp.
--C Make the contents of generated lookup tables constant, i.e., readonly.
--d Enables the debugging option (produces verbose output to the standard error).
--D Handle keywords that hash to duplicate values. This is useful
- for certain highly redundant keyword sets.
--e Allow user to provide a string containing delimiters used to separate
- keywords from their attributes. Default is ",\n"
--E Define constant values using an enum local to the lookup function
- rather than with defines
--f Generate the gen-perf.hash function ``fast.'' This decreases GPERF's
- running time at the cost of minimizing generated table-size.
- The numeric argument represents the number of times to iterate when
- resolving a collision. `0' means ``iterate by the number of keywords.''
--g Make generated routines use ``inline'' to remove function overhead.
--G Generate the static table of keywords as a static global variable,
- rather than hiding it inside of the lookup function (which is the
- default behavior).
--h Prints this mesage.
--H Allow user to specify name of generated hash function. Default
- is `hash'.
--i Provide an initial value for the associate values array. Default is 0.
--I Generate comparison code using case insensitive string comparison, e.g.,
- strncasecmp or strcasecmp.
- Setting this value larger helps inflate the size of the final table.
--j Affects the ``jump value,'' i.e., how far to advance the associated
- character value upon collisions. Must be an odd number, default is 5.
--J Skips '#include <string.h>' part in the output.
--k Allows selection of the key positions used in the hash function.
- The allowable choices range between 1-126, inclusive. The positions
- are separated by commas, ranges may be used, and key positions may
- occur in any order. Also, the meta-character '*' causes the generated
- hash function to consider ALL key positions, and $ indicates the
- ``final character'' of a key, e.g., $,1,2,4,6-10.
--K Allow use to select name of the keyword component in the keyword structure.
--l Compare key lengths before trying a string comparison. This helps
- cut down on the number of string comparisons made during the lookup.
--L Generates code in the language specified by the option's argument. Languages
- handled are currently C++ and C. The default is C.
--m Avoids the warning about identical hash values. This is valid
- only if the -D option is enabled.
--M Skips class definition in the output. This is valid only in C++ mode.
--n Do not include the length of the keyword when computing the hash function
--N Allow user to specify name of generated lookup function. Default
- name is `in_word_set.'
--o Reorders input keys by frequency of occurrence of the key sets.
- This should decrease the search time dramatically.
--O Optimize the generated lookup function by assuming that all input keywords
- are members of the keyset from the keyfile.
--p Changes the return value of the generated function ``in_word_set''
- from its default boolean value (i.e., 0 or 1), to type ``pointer
- to wordlist array'' This is most useful when the -t option, allowing
- user-defined structs, is used.
--r Utilizes randomness to initialize the associated values table.
--s Affects the size of the generated hash table. The numeric argument
- for this option indicates ``how many times larger or smaller'' the associated
- value range should be, in relationship to the number of keys, e.g. a value of 3
- means ``allow the maximum associated value to be about 3 times larger than the
- number of input keys.'' Conversely, a value of -3 means ``make the maximum
- associated value about 3 times smaller than the number of input keys.
- A larger table should decrease the time required for an unsuccessful search,
- at the expense of extra table space. Default value is 1.
--S Causes the generated C code to use a switch statement scheme, rather
- than an array lookup table. This can lead to a reduction in both
- time and space requirements for some keyfiles. The argument to
- this option determines how many switch statements are generated.
- A value of 1 generates 1 switch containing all the elements, a value of 2
- generates 2 tables with 1/2 the elements in each table, etc. This
- is useful since many C compilers cannot correctly generate code for
- large switch statements.
--t Allows the user to include a structured type declaration for
- generated code. Any text before %% is consider part of the type
- declaration. Key words and additional fields may follow this, one
- group of fields per line.
--T Prevents the transfer of the type declaration to the output file.
- Use this option if the type is already defined elsewhere.
--v Prints out the current version number and exits with a value of 0
--V Exits silently with a value of 0.
--Z Allow user to specify name of generated C++ class. Default
- name is `Perfect_Hash.'
-Usage: ../src/gperf [-aBcCdDef[num]gGhH<hashname>i<init>IjJk<keys>K<keyname>lL<language>mMnN<function name>oOprs<size>S<switches>tTvVZ<class name>].
-(type ../src/gperf -h for help)