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2660803697
When no suitable YACC is configured, supply useful informational messages to users. (Same way flex has been handled for a while.)
102 lines
2.9 KiB
Plaintext
102 lines
2.9 KiB
Plaintext
# $Header: /cvsroot/pgsql/config/programs.m4,v 1.4 2001/02/10 22:31:42 petere Exp $
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# PGAC_PATH_FLEX
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# --------------
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# Look for Flex, set the output variable FLEX to its path if found.
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# Avoid the buggy version 2.5.3. Also find Flex if its installed
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# under `lex', but do not accept other Lex programs.
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AC_DEFUN([PGAC_PATH_FLEX],
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[AC_CACHE_CHECK([for flex], pgac_cv_path_flex,
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[# Let the user override the test
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if test -n "$FLEX"; then
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pgac_cv_path_flex=$FLEX
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else
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pgac_save_IFS=$IFS
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IFS=:
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for pgac_dir in $PATH; do
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if test -z "$pgac_dir" || test x"$pgac_dir" = x"."; then
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pgac_dir=`pwd`
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fi
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for pgac_prog in flex lex; do
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pgac_candidate="$pgac_dir/$pgac_prog"
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if test -f "$pgac_candidate" \
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&& $pgac_candidate --version </dev/null >/dev/null 2>&1
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then
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echo '%%' > conftest.l
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if $pgac_candidate -t conftest.l 2>/dev/null | grep FLEX_SCANNER >/dev/null 2>&1; then
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if $pgac_candidate --version | grep '2\.5\.3' >/dev/null 2>&1; then
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pgac_broken_flex=$pgac_candidate
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continue
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fi
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pgac_cv_path_flex=$pgac_candidate
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break 2
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fi
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fi
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done
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done
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IFS=$pgac_save_IFS
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rm -f conftest.l
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: ${pgac_cv_path_flex=no}
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fi
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])[]dnl AC_CACHE_CHECK
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if test x"$pgac_cv_path_flex" = x"no"; then
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if test -n "$pgac_broken_flex"; then
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AC_MSG_WARN([
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*** The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
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*** should get version 2.5.4 or later.])
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fi
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AC_MSG_WARN([
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*** Without Flex you will not be able to build PostgreSQL from CVS or
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*** change any of the scanner definition files. You can obtain Flex from
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*** a GNU mirror site. (If you are using the official distribution of
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*** PostgreSQL then you do not need to worry about this because the Flex
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*** output is pre-generated.)])
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fi
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if test x"$pgac_cv_path_flex" = x"no"; then
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FLEX=
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else
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FLEX=$pgac_cv_path_flex
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fi
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AC_SUBST(FLEX)
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AC_SUBST(FLEXFLAGS)
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])# PGAC_PATH_FLEX
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# PGAC_CHECK_READLINE
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# -------------------
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# Check for the readline library and dependent libraries, either
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# termcap or curses. Also try libedit, since NetBSD's is compatible.
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# Add the required flags to LIBS, define HAVE_LIBREADLINE.
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AC_DEFUN([PGAC_CHECK_READLINE],
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[AC_MSG_CHECKING([for readline])
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AC_CACHE_VAL([pgac_cv_check_readline],
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[pgac_cv_check_readline=no
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for pgac_lib in "" " -ltermcap" " -lncurses" " -lcurses" ; do
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for pgac_rllib in -lreadline -ledit ; do
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pgac_save_LIBS=$LIBS
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LIBS="${pgac_rllib}${pgac_lib} $LIBS"
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AC_TRY_LINK_FUNC([readline], [pgac_cv_check_readline="${pgac_rllib}${pgac_lib}"; break 2])
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LIBS=$pgac_save_LIBS
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done
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done
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LIBS=$pgac_save_LIBS
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])[]dnl AC_CACHE_VAL
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if test "$pgac_cv_check_readline" != no ; then
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AC_DEFINE(HAVE_LIBREADLINE)
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LIBS="$pgac_cv_check_readline $LIBS"
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AC_MSG_RESULT([yes ($pgac_cv_check_readline)])
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else
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AC_MSG_RESULT(no)
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fi])# PGAC_CHECK_READLINE
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