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Advance the minimum required version of "flex" from 2.5.4 to 2.5.31, and

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update documentation accordingly.  This is required in order to have support
for a reentrant scanner.  I'm committing this bit separately in order to have
an easy reference if we later decide to make the minimum something different
(like 2.5.33).
This commit is contained in:
Tom Lane
2009-07-13 01:51:56 +00:00
parent 4bd556b193
commit da4b900176
4 changed files with 37 additions and 39 deletions
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34
config/programs.m4
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@ -1,4 +1,4 @@
# $PostgreSQL: pgsql/config/programs.m4,v 1.24 2008/08/29 13:02:32 petere Exp $
# $PostgreSQL: pgsql/config/programs.m4,v 1.25 2009/07/13 01:51:56 tgl Exp $
# PGAC_PATH_BISON
@ -42,8 +42,11 @@ AC_SUBST(BISONFLAGS)
# 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.
# Reject versions before 2.5.31, as we need a reasonably non-buggy reentrant
# scanner. (Note: the well-publicized security problem in 2.5.31 does not
# affect Postgres, and there are still distros shipping patched 2.5.31,
# so allow it.) 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,
@ -65,13 +68,16 @@ else
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=$pgac_candidate
continue
pgac_flex_version=`$pgac_candidate --version 2>/dev/null`
if echo "$pgac_flex_version" | sed ['s/[.a-z]/ /g'] | $AWK '{ if ([$]1 = 2 && [$]2 = 5 && [$]3 >= 31) exit 0; else exit 1;}'
then
pgac_cv_path_flex=$pgac_candidate
break 2
else
AC_MSG_WARN([
*** The installed version of Flex, $pgac_candidate, is too old to use with PostgreSQL.
*** Flex version 2.5.31 or later is required.])
fi
pgac_cv_path_flex=$pgac_candidate
break 2
fi
fi
done
@ -82,14 +88,8 @@ 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 $pgac_broken_flex contains a bug. You
*** should get version 2.5.4 or later.])
fi
AC_MSG_WARN([
*** Without Flex you will not be able to build PostgreSQL from CVS or
*** Without Flex you will not be able to build PostgreSQL from CVS nor
*** change any of the scanner definition files. You can obtain Flex from
*** a GNU mirror site. (If you are using the official distribution of
*** PostgreSQL then you do not need to worry about this because the Flex
@ -98,7 +98,7 @@ if test x"$pgac_cv_path_flex" = x"no"; then
FLEX=
else
FLEX=$pgac_cv_path_flex
pgac_flex_version=`$FLEX -V 2>/dev/null`
pgac_flex_version=`$FLEX --version 2>/dev/null`
AC_MSG_NOTICE([using $pgac_flex_version])
fi