On 4/11/14, 4:11 PM, Дилян Палаузов wrote:
> Hello,
>
> when I do ./configure --with-curses the TERMCAP_LIB Makefile variable is
> filled with -lcurses, and when I do ./configure --without-curses,
> TERMCAP_LIB is -ltermcap .
OK, -ltermcap is the default. The readline configure process will use that
if --with-curses isn't supplied and the configure macro that looks for a
ncurses/curses/termlib/termcap library comes up empty.
>
> In terms of support/shobj-conf, my system is "linux-gnu-gcc-unknown", so
> the case "linux*-*|gnu*-*|k*bsd*-gnu-*|freebsd*-gentoo" on line 127 is called.
>
> My SHLIB_LIBS is empty, because only on cygwin* and mingw* TERMCAP_LIB is
> added to SHLIB_LIBS .
Because Unix systems allow the calling application to supply values for the
undefined BC, PC, and UP symbols, and Windows traditionally did not.
> In shlib/Makefile lines 175-182 the same linker parameters are used to link
> with libhistory and libreadline . To my understanding, libhistory does not
> need TERMCAP_LIB, as the latter does not contain symbols libhistory needs,
> but despite of this, on mingw and cygwin, shlib/libhistory is linked with
> $TERM_CAP.
Yes, both libraries use identical linking commands.
> On the other side, under Linux, shlib/libreadline is liked with:
>
> $(CC) -shared -Wl,-soname,libreadline.so.6.3 -L/usr/lib -L/lib
> -Wl,-rpath,/usr/lib -Wl,-soname,libreadline.so.6 -o libreadline.so.6.3
> readline.so vi_mode.so funmap.so keymaps.so parens.so search.so rltty.so
> complete.so bind.so isearch.so display.so signals.so util.so kill.so
> undo.so macro.so input.so callback.so terminal.so text.so nls.so misc.so
> history.so histexpand.so histfile.so histsearch.so shell.so mbutil.so
> tilde.so colors.so parse-colors.so xmalloc.so xfree.so compat.so
>
> -> without passing TERMCAP_LIB, which leads to undefined symbols:
>
> nm shlib/libreadline.so.6.3 | grep " U " | grep -v GLIBC
>
> U BC
> U PC
> U tgetent
> U tgetflag
> U tgetnum
> U tgetstr
> U tgoto
> U tputs
> U UP
Correct. Readline does not `overlink'; the application linking with
readline chooses which library to link with to satisfy the termcap library
symbols.
The problem, if one exists, is probably in defaulting TERMCAP_LIB to
-ltermcap.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU [email protected] http://cnswww.cns.cwru.edu/~chet/
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