Add configure option `--with-termcap=LIB' to select termcap library.

LIB=no disables any termcap library (causing the use of the built-in
termcap emulation); LIB=yes, the default, makes configure choose
whatever termcap library looks best.

I wanted to go further and make the termcap primitives dynamically
loadable, so that the compile-time choice of termcap library can be
made just for some prtermcap.so module separately from the libraries
against which the microcode is linked, but uxtty.c uses termcap for
screen-clearing and window-sizing.

If ^L worked everywhere to clear the screen, and TIOCGWINSZ worked
everywhere to find the screen dimensions, then we could get rid of
those uses of termcap and move it off to a module.  But alas, that is
not the case.  E.g., ^L doesn't clear the screen in screen.

diff --git a/src/microcode/configure.ac b/src/microcode/configure.ac
index 7f930cfdae158ed0dae5074bca5c91e47d8837c4..a1364e4e9f8b6d1aa0d1463d5a0692e7c98fd536 100644 (file)
--- a/src/microcode/configure.ac
+++ b/src/microcode/configure.ac
@@ -158,6 +158,11 @@ AC_ARG_WITH([libpq],
        [Use PostgreSQL libpq library if available [[yes]]]))
 : ${with_libpq='yes'}
 
+AC_ARG_WITH([termcap],
+    AS_HELP_STRING([--with-termcap],
+       [Use a termcap library if available [[yes]]]))
+: ${with_termcap='yes'}
+
 dnl For reasons I don't understand, it is necessary to use
 dnl quadigraphs here instead of [[ ... ]].
 AC_ARG_WITH([macosx-version],
@@ -686,64 +691,72 @@ dnl database, we can emulate `tparam' -- either in terms of `tparm' or
 dnl by pretending we know the format -- without bringing in the local
 dnl termcap reimplementation.
 
-AC_CHECK_LIB([ncurses], [tgetent], [have_ncurses=yes])
-AC_CHECK_LIB([ncurses], [tparm], [have_ncurses_tparm=yes])
-AC_CHECK_LIB([ncurses], [tparam], [have_ncurses_tparam=yes])
-AC_CHECK_LIB([curses], [tgetent], [have_curses=yes])
-AC_CHECK_LIB([curses], [tparm], [have_curses_tparm=yes])
-AC_CHECK_LIB([curses], [tparam], [have_curses_tparam=yes])
-AC_CHECK_LIB([termcap], [tgetent], [have_termcap=yes])
-AC_CHECK_LIB([termcap], [tparm], [have_termcap_tparm=yes])
-AC_CHECK_LIB([termcap], [tparam], [have_termcap_tparam=yes])
-
-if test "x${have_ncurses}" = xyes; then
-    termcap_library=ncurses
-elif test "x${have_curses_tparm}" != xyes      \
-       || test "x${have_curses_tparam}" != xyes
-then
-    if test "x${have_termcap}" = xyes; then
-       termcap_library=termcap
+if test "x${with_termcap}" = xyes; then
+
+    AC_CHECK_LIB([ncurses], [tgetent], [have_ncurses=yes])
+    AC_CHECK_LIB([ncurses], [tparm], [have_ncurses_tparm=yes])
+    AC_CHECK_LIB([ncurses], [tparam], [have_ncurses_tparam=yes])
+    AC_CHECK_LIB([curses], [tgetent], [have_curses=yes])
+    AC_CHECK_LIB([curses], [tparm], [have_curses_tparm=yes])
+    AC_CHECK_LIB([curses], [tparam], [have_curses_tparam=yes])
+    AC_CHECK_LIB([termcap], [tgetent], [have_termcap=yes])
+    AC_CHECK_LIB([termcap], [tparm], [have_termcap_tparm=yes])
+    AC_CHECK_LIB([termcap], [tparam], [have_termcap_tparam=yes])
+
+    if test "x${have_ncurses}" = xyes; then
+       with_termcap=ncurses
+    elif test "x${have_curses_tparm}" != xyes  \
+           || test "x${have_curses_tparam}" != xyes
+    then
+       if test "x${have_termcap}" = xyes; then
+           with_termcap=termcap
+       elif test "x${have_curses}" = xyes; then
+           with_termcap=curses
+       fi
+    dnl This is a little unusual (that we have either `tparm' or `tparam'
+    dnl from `-lcurses', but not `tgetent'), but we should check anyway.
     elif test "x${have_curses}" = xyes; then
-       termcap_library=curses
+       with_termcap=curses
+    elif test "x${have_termcap}" = xyes; then
+       with_termcap=termcap
+    fi
+
+elif test "x${with_termcap}" != xno; then
+
+    lib=${with_termcap}
+    AC_CHECK_LIB([${lib}], [tgetent], [eval have_${lib}=yes])
+    AC_CHECK_LIB([${lib}], [tparm], [eval have_${lib}_tparm=yes])
+    AC_CHECK_LIB([${lib}], [tparam], [eval have_${lib}_tparam=yes])
+
+    if eval test "\"x\${have_${lib}}\"" != xyes; then
+       AC_MSG_ERROR([No tgetent in termcap library: ${with_termcap}])
     fi
-dnl This is a little unusual (that we have either `tparm' or `tparam'
-dnl from `-lcurses', but not `tgetent'), but we should check anyway.
-elif test "x${have_curses}" = xyes; then
-    termcap_library=curses
-elif test "x${have_termcap}" = xyes; then
-    termcap_library=termcap
+
 fi
 
-case ${termcap_library} in
-curses)
-    AC_CHECK_HEADERS([curses.h term.h])
-    LIBS="-lcurses ${LIBS}"
-    ;;
-ncurses)
-    dnl ncurses sometimes uses ncurses.h and sometimes uses curses.h.
-    dnl We use whichever one is available, preferring the more
-    dnl specifically named one.
-    AC_CHECK_HEADERS([ncurses.h curses.h term.h])
-    LIBS="-lncurses ${LIBS}"
-    ;;
-termcap)
-    LIBS="-ltermcap ${LIBS}"
-    ;;
-esac
+dnl Go for whatever header files we can.
+AC_CHECK_HEADERS([ncurses.h curses.h term.h])
 
-if test "x${termcap_library}" = xno; then
+case "${with_termcap}" in
+yes)
+    AC_MSG_WARN([No termcap library found; will emulate it])
     OPTIONAL_BASES="${OPTIONAL_BASES} termcap tparam"
-else
-    eval have_tparam=\$have_${termcap_library}_tparam
+    ;;
+no) ;;
+*)
+    LIBS="-l${with_termcap} ${LIBS}"
+    eval have_tparam=\$have_${with_termcap}_tparam
     if test "x${have_tparam}" != xyes; then
-       eval have_tparm=\$have_${termcap_library}_tparm
+       eval have_tparm=\$have_${with_termcap}_tparm
        if test "x${have_tparm}" = xyes; then
+           AC_MSG_WARN([No tparam found; will emulate it from terminfo tparm])
            OPTIONAL_BASES="${OPTIONAL_BASES} terminfo"
        else
+           AC_MSG_WARN([No tparam found; will emulate it])
            OPTIONAL_BASES="${OPTIONAL_BASES} tparam"
        fi
     fi
-fi
+esac
 
 dnl The OpenSSL crypto library provides support for blowfish and MD5.
 if test "${with_openssl}" != no; then