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1 This directory contains the -liberty library of free software.
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2 It is a collection of subroutines used by various GNU programs.
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3 Current members include:
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4
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5 getopt -- get options from command line
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6 obstack -- stacks of arbitrarily-sized objects
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7 strerror -- error message strings corresponding to errno
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8 strtol -- string-to-long conversion
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9 strtoul -- string-to-unsigned-long conversion
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10
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11 We expect many of the GNU subroutines that are floating around to
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12 eventually arrive here.
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13
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14 The library must be configured from the top source directory. Don't
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15 try to run configure in this directory. Follow the configuration
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16 instructions in ../README.
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17
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18 Please report bugs to "gcc-bugs@gcc.gnu.org" and send fixes to
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19 "gcc-patches@gcc.gnu.org". Thank you.
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20
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21 ADDING A NEW FILE
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22 =================
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23
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24 There are two sets of files: Those that are "required" will be
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25 included in the library for all configurations, while those
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26 that are "optional" will be included in the library only if "needed."
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27
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28 To add a new required file, edit Makefile to add the source file
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29 name to CFILES and the object file to REQUIRED_OFILES.
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30
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31 To add a new optional file, it must provide a single function, and the
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32 name of the function must be the same as the name of the file.
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33
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34 * Add the source file name to CFILES.
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35
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36 * Add the function to name to the funcs shell variable in
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37 configure.ac.
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38
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39 * Add the function to the AC_CHECK_FUNCS lists just after the
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40 setting of the funcs shell variable. These AC_CHECK_FUNCS calls
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41 are never executed; they are there to make autoheader work
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42 better.
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43
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44 * Consider the special cases of building libiberty; as of this
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45 writing, the special cases are newlib and VxWorks. If a
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46 particular special case provides the function, you do not need
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47 to do anything. If it does not provide the function, add the
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48 object file to LIBOBJS, and add the function name to the case
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49 controlling whether to define HAVE_func.
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50
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51 The optional file you've added (e.g. getcwd.c) should compile and work
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52 on all hosts where it is needed. It does not have to work or even
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53 compile on hosts where it is not needed.
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54
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55 ADDING A NEW CONFIGURATION
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56 ==========================
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57
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58 On most hosts you should be able to use the scheme for automatically
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59 figuring out which files are needed. In that case, you probably
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60 don't need a special Makefile stub for that configuration.
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61
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62 If the fully automatic scheme doesn't work, you may be able to get
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63 by with defining EXTRA_OFILES in your Makefile stub. This is
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64 a list of object file names that should be treated as required
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65 for this configuration - they will be included in libiberty.a,
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66 regardless of whatever might be in the C library.
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