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# $Header: /cvsroot/pgsql/config/programs.m4,v 1.2 2000/10/26 16:28:00 petere Exp $
# PGAC_PATH_FLEX
# --------------
# Look for Flex, set the output variable FLEX to its path if found.
# Avoid the buggy version 2.5.3. Also find Flex if its installed
# under `lex', but do not accept other Lex programs.
AC_DEFUN([PGAC_PATH_FLEX],
[AC_CACHE_CHECK([for flex], pgac_cv_path_flex,
[# Let the user override the test
if test -n "$FLEX"; then
pgac_cv_path_flex=$FLEX
else
pgac_save_IFS=$IFS
IFS=:
for pgac_dir in $PATH; do
if test -z "$pgac_dir" || test x"$pgac_dir" = x"."; then
pgac_dir=`pwd`
fi
for pgac_prog in flex lex; do
pgac_candidate="$pgac_dir/$pgac_prog"
if test -f "$pgac_candidate" \
&& $pgac_candidate --version </dev/null >/dev/null 2>&1
then
echo '%%' > conftest.l
if $pgac_candidate -t conftest.l 2>/dev/null | grep FLEX_SCANNER >/dev/null 2>&1; then
if $pgac_candidate --version | grep '2\.5\.3' >/dev/null 2>&1; then
pgac_broken_flex=$pgac_candidate
continue
fi
pgac_cv_path_flex=$pgac_candidate
break 2
fi
fi
done
done
IFS=$pgac_save_IFS
rm -f conftest.l
: ${pgac_cv_path_flex=no}
fi
])[]dnl AC_CACHE_CHECK
if test x"$pgac_cv_path_flex" = x"no"; then
if test -n "$pgac_broken_flex"; then
AC_MSG_WARN([
***
The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
should get version 2.5.4 or later.
###])
fi
AC_MSG_WARN([
***
Without Flex you won't be able to build PostgreSQL from scratch, or change
any of the scanner definition files. You can obtain Flex from a GNU mirror
site. (If you are using the official distribution of PostgreSQL then you
do not need to worry about this because the lexer files are pre-generated.)
***])
fi
if test x"$pgac_cv_path_flex" = x"no"; then
FLEX=
else
FLEX=$pgac_cv_path_flex
fi
AC_SUBST(FLEX)
AC_SUBST(FLEXFLAGS)
])# PGAC_PATH_FLEX
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