798 Part (Web hosting support) VI . Programming in Linux Table
798 Part VI . Programming in Linux Table 29-4 ar Command-Line Options Option Description -c Suppresses the warning ar would normally emit if the archive doesn t already exist. -q Adds files to the end of archive without checking for replacements. -r Inserts files into archive, replacing any existing members whose name matches that being added. New members are added at the end of the archive. -s Creates or updates the map linking symbols to the member in which they are defined. Given an archive created with the ar command, you can speed up access to the archive by creating an index to the archive. ranlib does precisely this, storing the index in the archive file itself. ranlib s syntax is: ranlib [-v|-V] file This generates a symbol map in file. It is equivalent to ar -s file. The ldd Command While nm lists the symbols defined in an object file, unless you know what library defines which functions, it is not terribly helpful. That is ldd s job. It lists the shared libraries that a program requires to run. Its syntax is: ldd [options] file ldd prints the names of the shared libraries file requires. Two of ldd s most useful options are -d, which reports any missing functions, and -r, which reports missing functions and missing data objects. For example, the following ldd reports that the mail client mutt (which may or may not be installed on your system) requires eight shared libraries. $ ldd /usr/bin/mutt libncursesw.so.5 => /lib/libncursesw.so.5 (0×40021000) libssl.so.0 => /usr/lib/libssl.so.0 (0×40066000) libcrypto.so.0 => /usr/lib/libcrypto.so.0 (0×40097000) libc.so.6 => /lib/libc.so.6 (0×40195000) libgpm.so.1 => /lib/libgpm.so.1 (0×402c5000) libdl.so.2 => /lib/libdl.so.2 (0×402cb000) /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0×40000000) libncurses.so.5 => /lib/libncurses.so.5 (0×402ce000) Tip
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