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Commitda4b900

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committed
Advance the minimum required version of "flex" from 2.5.4 to 2.5.31, and
update documentation accordingly. This is required in order to have supportfor a reentrant scanner. I'm committing this bit separately in order to havean easy reference if we later decide to make the minimum something different(like 2.5.33).
1 parent4bd556b commitda4b900

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4 files changed

+37
-39
lines changed

4 files changed

+37
-39
lines changed

‎config/programs.m4‎

Lines changed: 17 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
# $PostgreSQL: pgsql/config/programs.m4,v 1.24 2008/08/29 13:02:32 petere Exp $
1+
# $PostgreSQL: pgsql/config/programs.m4,v 1.25 2009/07/13 01:51:56 tgl Exp $
22

33

44
# PGAC_PATH_BISON
@@ -42,8 +42,11 @@ AC_SUBST(BISONFLAGS)
4242
# PGAC_PATH_FLEX
4343
# --------------
4444
# Look for Flex, set the output variable FLEX to its path if found.
45-
# Avoid the buggy version 2.5.3. Also find Flex if its installed
46-
# under `lex', but do not accept other Lex programs.
45+
# Reject versions before 2.5.31, as we need a reasonably non-buggy reentrant
46+
# scanner. (Note: the well-publicized security problem in 2.5.31 does not
47+
# affect Postgres, and there are still distros shipping patched 2.5.31,
48+
# so allow it.) Also find Flex if its installed under `lex', but do not
49+
# accept other Lex programs.
4750

4851
AC_DEFUN([PGAC_PATH_FLEX],
4952
[AC_CACHE_CHECK([for flex],pgac_cv_path_flex,
@@ -65,13 +68,16 @@ else
6568
then
6669
echo '%%' > conftest.l
6770
if $pgac_candidate -t conftest.l 2>/dev/null | grep FLEX_SCANNER >/dev/null 2>&1; then
68-
if $pgac_candidate --version | grep ' 2\.5\.3$' >/dev/null 2>&1; then
69-
pgac_broken_flex=$pgac_candidate
70-
continue
71+
pgac_flex_version=`$pgac_candidate --version 2>/dev/null`
72+
if echo "$pgac_flex_version" | sed['s/[.a-z]/ /g'] | $AWK '{ if ([$]1 = 2 &&[$]2 = 5 &&[$]3 >= 31) exit 0; else exit 1;}'
73+
then
74+
pgac_cv_path_flex=$pgac_candidate
75+
break 2
76+
else
77+
AC_MSG_WARN([
78+
*** The installed version of Flex, $pgac_candidate, is too old to use with PostgreSQL.
79+
*** Flex version 2.5.31 or later is required.])
7180
fi
72-
73-
pgac_cv_path_flex=$pgac_candidate
74-
break 2
7581
fi
7682
fi
7783
done
@@ -82,14 +88,8 @@ fi
8288
])[]dnl AC_CACHE_CHECK
8389
8490
if test x"$pgac_cv_path_flex" = x"no"; then
85-
if test -n "$pgac_broken_flex"; then
86-
AC_MSG_WARN([
87-
*** The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
88-
*** should get version 2.5.4 or later.])
89-
fi
90-
9191
AC_MSG_WARN([
92-
*** Without Flex you will not be able to build PostgreSQL from CVSor
92+
*** Without Flex you will not be able to build PostgreSQL from CVSnor
9393
*** change any of the scanner definition files. You can obtain Flex from
9494
*** a GNU mirror site. (If you are using the official distribution of
9595
*** PostgreSQL then you do not need to worry about this because the Flex
@@ -98,7 +98,7 @@ if test x"$pgac_cv_path_flex" = x"no"; then
9898
FLEX=
9999
else
100100
FLEX=$pgac_cv_path_flex
101-
pgac_flex_version=`$FLEX -V 2>/dev/null`
101+
pgac_flex_version=`$FLEX --version 2>/dev/null`
102102
AC_MSG_NOTICE([using $pgac_flex_version])
103103
fi
104104

‎configure‎

Lines changed: 15 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -6779,13 +6779,19 @@ else
67796779
then
67806780
echo '%%' > conftest.l
67816781
if $pgac_candidate -t conftest.l 2>/dev/null | grep FLEX_SCANNER >/dev/null 2>&1; then
6782-
if $pgac_candidate --version | grep ' 2\.5\.3$' >/dev/null 2>&1; then
6783-
pgac_broken_flex=$pgac_candidate
6784-
continue
6782+
pgac_flex_version=`$pgac_candidate --version 2>/dev/null`
6783+
if echo "$pgac_flex_version" | sed 's/[.a-z]/ /g' | $AWK '{ if ($1 = 2 && $2 = 5 && $3 >= 31) exit 0; else exit 1;}'
6784+
then
6785+
pgac_cv_path_flex=$pgac_candidate
6786+
break 2
6787+
else
6788+
{ $as_echo "$as_me:$LINENO: WARNING:
6789+
*** The installed version of Flex, $pgac_candidate, is too old to use with PostgreSQL.
6790+
*** Flex version 2.5.31 or later is required." >&5
6791+
$as_echo "$as_me: WARNING:
6792+
*** The installed version of Flex, $pgac_candidate, is too old to use with PostgreSQL.
6793+
*** Flex version 2.5.31 or later is required." >&2;}
67856794
fi
6786-
6787-
pgac_cv_path_flex=$pgac_candidate
6788-
break 2
67896795
fi
67906796
fi
67916797
done
@@ -6798,23 +6804,14 @@ fi
67986804
{ $as_echo "$as_me:$LINENO: result: $pgac_cv_path_flex" >&5
67996805
$as_echo "$pgac_cv_path_flex" >&6; }
68006806
if test x"$pgac_cv_path_flex" = x"no"; then
6801-
if test -n "$pgac_broken_flex"; then
6802-
{ $as_echo "$as_me:$LINENO: WARNING:
6803-
*** The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
6804-
*** should get version 2.5.4 or later." >&5
6805-
$as_echo "$as_me: WARNING:
6806-
*** The Flex version 2.5.3 you have at $pgac_broken_flex contains a bug. You
6807-
*** should get version 2.5.4 or later." >&2;}
6808-
fi
6809-
68106807
{ $as_echo "$as_me:$LINENO: WARNING:
6811-
*** Without Flex you will not be able to build PostgreSQL from CVSor
6808+
*** Without Flex you will not be able to build PostgreSQL from CVSnor
68126809
*** change any of the scanner definition files. You can obtain Flex from
68136810
*** a GNU mirror site. (If you are using the official distribution of
68146811
*** PostgreSQL then you do not need to worry about this because the Flex
68156812
*** output is pre-generated.)" >&5
68166813
$as_echo "$as_me: WARNING:
6817-
*** Without Flex you will not be able to build PostgreSQL from CVSor
6814+
*** Without Flex you will not be able to build PostgreSQL from CVSnor
68186815
*** change any of the scanner definition files. You can obtain Flex from
68196816
*** a GNU mirror site. (If you are using the official distribution of
68206817
*** PostgreSQL then you do not need to worry about this because the Flex
@@ -6823,7 +6820,7 @@ $as_echo "$as_me: WARNING:
68236820
FLEX=
68246821
else
68256822
FLEX=$pgac_cv_path_flex
6826-
pgac_flex_version=`$FLEX -V 2>/dev/null`
6823+
pgac_flex_version=`$FLEX --version 2>/dev/null`
68276824
{ $as_echo "$as_me:$LINENO: using $pgac_flex_version" >&5
68286825
$as_echo "$as_me: using $pgac_flex_version" >&6;}
68296826
fi

‎doc/src/sgml/install-win32.sgml‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/install-win32.sgml,v 1.52 2009/04/27 16:27:35 momjian Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/install-win32.sgml,v 1.53 2009/07/13 01:51:56 tgl Exp $ -->
22

33
<chapter id="install-win32">
44
<title>Installation from Source Code on <productname>Windows</productname></title>
@@ -102,7 +102,8 @@
102102
<listitem><para>
103103
Bison and Flex are required to build from CVS, but not required when
104104
building from a release file. Note that only Bison 1.875 or versions
105-
2.2 and later will work. Bison and Flex can be
105+
2.2 and later will work. Also, Flex version 2.5.31 or later is required.
106+
Bison and Flex can be
106107
downloaded from <ulink url="http://gnuwin32.sourceforge.net"></>.
107108
</para></listitem>
108109
</varlistentry>

‎doc/src/sgml/installation.sgml‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.325 2009/06/23 03:46:00 tgl Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.326 2009/07/13 01:51:56 tgl Exp $ -->
22

33
<chapter id="installation">
44
<title><![%standalone-include[<productname>PostgreSQL</>]]>
@@ -296,7 +296,7 @@ su - postgres
296296
GNU <application>Flex</> and <application>Bison</>
297297
are needed to build from a CVS checkout, or if you changed the actual
298298
scanner and parser definition files. If you need them, be sure
299-
to get <application>Flex</> 2.5.4 or later and
299+
to get <application>Flex</> 2.5.31 or later and
300300
<application>Bison</> 1.875 or later. Other <application>lex</>
301301
and <application>yacc</> programs cannot be used.
302302
</para>

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