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[GNUnet-SVN] [gnunet] branch master updated: fixing #5440: updating post


From: gnunet
Subject: [GNUnet-SVN] [gnunet] branch master updated: fixing #5440: updating postgres test m4 macro
Date: Wed, 21 Nov 2018 00:47:08 +0100

This is an automated email from the git hooks/post-receive script.

grothoff pushed a commit to branch master
in repository gnunet.

The following commit(s) were added to refs/heads/master by this push:
     new 8a039e9e8 fixing #5440: updating postgres test m4 macro
8a039e9e8 is described below

commit 8a039e9e8142bd95779fd8beb1b316be1a46668f
Author: Christian Grothoff <address@hidden>
AuthorDate: Wed Nov 21 00:47:06 2018 +0100

    fixing #5440: updating postgres test m4 macro
---
 configure.ac             |  14 +--
 m4/Makefile.am           |   2 +
 m4/ax_compare_version.m4 | 177 ++++++++++++++++++++++++++
 m4/ax_lib_postgresql.m4  | 272 +++++++++++++++++++++++++++-------------
 m4/pkg.m4                | 320 +++++++++++++++++++++++++++++++++++++++--------
 5 files changed, 636 insertions(+), 149 deletions(-)

diff --git a/configure.ac b/configure.ac
index 69a7d0c24..45b2024a5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1067,14 +1067,12 @@ CPPFLAGS=$SAVE_CPPFLAGS
 # test for postgres
 postgres=false
 # even running the check for postgres breaks emscripten ...
-if test "$taler_only" != yes; then
-  AX_LIB_POSTGRESQL([9.5])
-  if test "x$found_postgresql" = "xyes"; then
-    CPPFLAGS="$CPPFLAGS $POSTGRESQL_CPPFLAGS"
-    AC_CHECK_HEADERS([libpq-fe.h],
-      postgres=true)
-  fi
-fi
+AS_IF([test "$taler_only" != yes],
+      [AX_LIB_POSTGRESQL([9.5],
+        [CPPFLAGS="$CPPFLAGS $POSTGRESQL_CPPFLAGS"
+         AC_CHECK_HEADERS([libpq-fe.h],
+         postgres=true)
+        ])])
 AM_CONDITIONAL(HAVE_POSTGRESQL, test x$postgres = xtrue)
 
 
diff --git a/m4/Makefile.am b/m4/Makefile.am
index bce01daae..d41788460 100644
--- a/m4/Makefile.am
+++ b/m4/Makefile.am
@@ -1,5 +1,7 @@
 # This Makefile.am is in the public domain
 EXTRA_DIST = glibc2.m4 intl.m4 intldir.m4 lock.m4 visibility.m4 \
+ax_compare_version.m4 \
+ax_lib_postgresql.m4 \
 absolute-header.m4 \
 libunistring.m4 \
 codeset.m4 \
diff --git a/m4/ax_compare_version.m4 b/m4/ax_compare_version.m4
new file mode 100644
index 000000000..ffb4997e8
--- /dev/null
+++ b/m4/ax_compare_version.m4
@@ -0,0 +1,177 @@
+# ===========================================================================
+#    https://www.gnu.org/software/autoconf-archive/ax_compare_version.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], 
[ACTION-IF-FALSE])
+#
+# DESCRIPTION
+#
+#   This macro compares two version strings. Due to the various number of
+#   minor-version numbers that can exist, and the fact that string
+#   comparisons are not compatible with numeric comparisons, this is not
+#   necessarily trivial to do in a autoconf script. This macro makes doing
+#   these comparisons easy.
+#
+#   The six basic comparisons are available, as well as checking equality
+#   limited to a certain number of minor-version levels.
+#
+#   The operator OP determines what type of comparison to do, and can be one
+#   of:
+#
+#    eq  - equal (test A == B)
+#    ne  - not equal (test A != B)
+#    le  - less than or equal (test A <= B)
+#    ge  - greater than or equal (test A >= B)
+#    lt  - less than (test A < B)
+#    gt  - greater than (test A > B)
+#
+#   Additionally, the eq and ne operator can have a number after it to limit
+#   the test to that number of minor versions.
+#
+#    eq0 - equal up to the length of the shorter version
+#    ne0 - not equal up to the length of the shorter version
+#    eqN - equal up to N sub-version levels
+#    neN - not equal up to N sub-version levels
+#
+#   When the condition is true, shell commands ACTION-IF-TRUE are run,
+#   otherwise shell commands ACTION-IF-FALSE are run. The environment
+#   variable 'ax_compare_version' is always set to either 'true' or 'false'
+#   as well.
+#
+#   Examples:
+#
+#     AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
+#     AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
+#
+#   would both be true.
+#
+#     AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
+#     AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
+#
+#   would both be false.
+#
+#     AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
+#
+#   would be true because it is only comparing two minor versions.
+#
+#     AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
+#
+#   would be true because it is only comparing the lesser number of minor
+#   versions of the two values.
+#
+#   Note: The characters that separate the version numbers do not matter. An
+#   empty string is the same as version 0. OP is evaluated by autoconf, not
+#   configure, so must be a string, not a variable.
+#
+#   The author would like to acknowledge Guido Draheim whose advice about
+#   the m4_case and m4_ifvaln functions make this macro only include the
+#   portions necessary to perform the specific comparison specified by the
+#   OP argument in the final configure script.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Tim Toolan <address@hidden>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 13
+
+dnl #########################################################################
+AC_DEFUN([AX_COMPARE_VERSION], [
+  AC_REQUIRE([AC_PROG_AWK])
+
+  # Used to indicate true or false condition
+  ax_compare_version=false
+
+  # Convert the two version strings to be compared into a format that
+  # allows a simple string comparison.  The end result is that a version
+  # string of the form 1.12.5-r617 will be converted to the form
+  # 0001001200050617.  In other words, each number is zero padded to four
+  # digits, and non digits are removed.
+  AS_VAR_PUSHDEF([A],[ax_compare_version_A])
+  A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
+                     -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/[[^0-9]]//g'`
+
+  AS_VAR_PUSHDEF([B],[ax_compare_version_B])
+  B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
+                     -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/[[^0-9]]//g'`
+
+  dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
+  dnl # then the first line is used to determine if the condition is true.
+  dnl # The sed right after the echo is to remove any indented white space.
+  m4_case(m4_tolower($2),
+  [lt],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
+  ],
+  [gt],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
+  ],
+  [le],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
+  ],
+  [ge],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
+  ],[
+    dnl Split the operator from the subversion count if present.
+    m4_bmatch(m4_substr($2,2),
+    [0],[
+      # A count of zero means use the length of the shorter version.
+      # Determine the number of characters in A and B.
+      ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'`
+      ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'`
+
+      # Set A to no more than B's length and B to no more than A's length.
+      A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
+      B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
+    ],
+    [[0-9]+],[
+      # A count greater than zero means use only that many subversions
+      A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
+      B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
+    ],
+    [.+],[
+      AC_WARNING(
+        [invalid OP numeric parameter: $2])
+    ],[])
+
+    # Pad zeros at end of numbers to make same length.
+    ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
+    B="$B`echo $A | sed 's/./0/g'`"
+    A="$ax_compare_version_tmp_A"
+
+    # Check for equality or inequality as necessary.
+    m4_case(m4_tolower(m4_substr($2,0,2)),
+    [eq],[
+      test "x$A" = "x$B" && ax_compare_version=true
+    ],
+    [ne],[
+      test "x$A" != "x$B" && ax_compare_version=true
+    ],[
+      AC_WARNING([invalid OP parameter: $2])
+    ])
+  ])
+
+  AS_VAR_POPDEF([A])dnl
+  AS_VAR_POPDEF([B])dnl
+
+  dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
+  if test "$ax_compare_version" = "true" ; then
+    m4_ifvaln([$4],[$4],[:])dnl
+    m4_ifvaln([$5],[else $5])dnl
+  fi
+]) dnl AX_COMPARE_VERSION
diff --git a/m4/ax_lib_postgresql.m4 b/m4/ax_lib_postgresql.m4
index 11b6991f0..cc8e75086 100644
--- a/m4/ax_lib_postgresql.m4
+++ b/m4/ax_lib_postgresql.m4
@@ -1,10 +1,10 @@
 # ===========================================================================
-#     http://www.gnu.org/software/autoconf-archive/ax_lib_postgresql.html
+#    https://www.gnu.org/software/autoconf-archive/ax_lib_postgresql.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
-#   AX_LIB_POSTGRESQL([MINIMUM-VERSION])
+#   
AX_LIB_POSTGRESQL([MINIMUM-VERSION],[ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
 #
 # DESCRIPTION
 #
@@ -23,133 +23,225 @@
 #   should be in the PATH)
 #
 #   path - complete path to pg_config utility, use this option if pg_config
-#   can't be found in the PATH
+#   can't be found in the PATH (You could set also PG_CONFIG variable)
 #
 #   This macro calls:
 #
 #     AC_SUBST(POSTGRESQL_CPPFLAGS)
 #     AC_SUBST(POSTGRESQL_LDFLAGS)
+#     AC_SUBST(POSTGRESQL_LIBS)
 #     AC_SUBST(POSTGRESQL_VERSION)
 #
 #   And sets:
 #
 #     HAVE_POSTGRESQL
 #
+#   It execute if found ACTION-IF-FOUND (empty by default) and
+#   ACTION-IF-NOT-FOUND (AC_MSG_FAILURE by default) if not found.
+#
 # LICENSE
 #
 #   Copyright (c) 2008 Mateusz Loskot <address@hidden>
+#   Copyright (c) 2014 Sree Harsha Totakura <address@hidden>
+#   Copyright (c) 2018 Bastien Roucaries <address@hidden>
 #
 #   Copying and distribution of this file, with or without modification, are
 #   permitted in any medium without royalty provided the copyright notice
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 9
+#serial 22
+
+AC_DEFUN([_AX_LIB_POSTGRESQL_OLD],[
+       found_postgresql="no"
+       _AX_LIB_POSTGRESQL_OLD_fail="no"
+       while true; do
+         AC_CACHE_CHECK([for the pg_config program], [ac_cv_path_PG_CONFIG],
+           [AC_PATH_PROGS_FEATURE_CHECK([PG_CONFIG], [pg_config],
+             [[ac_cv_path_PG_CONFIG="";$ac_path_PG_CONFIG --includedir > 
/dev/null \
+               && ac_cv_path_PG_CONFIG=$ac_path_PG_CONFIG 
ac_path_PG_CONFIG_found=:]],
+             [ac_cv_path_PG_CONFIG=""])])
+         PG_CONFIG=$ac_cv_path_PG_CONFIG
+         AS_IF([test "X$PG_CONFIG" = "X"],[break])
+
+         AC_CACHE_CHECK([for the PostgreSQL libraries 
CPPFLAGS],[ac_cv_POSTGRESQL_CPPFLAGS],
+                      [ac_cv_POSTGRESQL_CPPFLAGS="-I`$PG_CONFIG --includedir`" 
|| _AX_LIB_POSTGRESQL_OLD_fail=yes])
+         AS_IF([test "X$_AX_LIB_POSTGRESQL_OLD_fail" = "Xyes"],[break])
+         POSTGRESQL_CPPFLAGS="$ac_cv_POSTGRESQL_CPPFLAGS"
+
+         AC_CACHE_CHECK([for the PostgreSQL libraries 
LDFLAGS],[ac_cv_POSTGRESQL_LDFLAGS],
+                      [ac_cv_POSTGRESQL_LDFLAGS="-L`$PG_CONFIG --libdir`" || 
_AX_LIB_POSTGRESQL_OLD_fail=yes])
+         AS_IF([test "X$_AX_LIB_POSTGRESQL_OLD_fail" = "Xyes"],[break])
+         POSTGRESQL_LDFLAGS="$ac_cv_POSTGRESQL_LDFLAGS"
+
+         AC_CACHE_CHECK([for the PostgreSQL libraries 
LIBS],[ac_cv_POSTGRESQL_LIBS],
+                      [ac_cv_POSTGRESQL_LIBS="-lpq"])
+         POSTGRESQL_LIBS="$ac_cv_POSTGRESQL_LIBS"
+
+         AC_CACHE_CHECK([for the PostgreSQL 
version],[ac_cv_POSTGRESQL_VERSION],
+                      [
+                       ac_cv_POSTGRESQL_VERSION=`$PG_CONFIG --version | sed 
"s/^PostgreSQL[[[:space:]]][[[:space:]]]*\([[0-9.]][[0-9.]]*\).*/\1/"` \
+                             || _AX_LIB_POSTGRESQL_OLD_fail=yes
+                      ])
+         AS_IF([test "X$_AX_LIB_POSTGRESQL_OLD_fail" = "Xyes"],[break])
+         POSTGRESQL_VERSION="$ac_cv_POSTGRESQL_VERSION"
+
+
+         dnl
+         dnl Check if required version of PostgreSQL is available
+         dnl
+         AS_IF([test X"$postgresql_version_req" != "X"],[
+            AC_MSG_CHECKING([if PostgreSQL version $POSTGRESQL_VERSION is >= 
$postgresql_version_req])
+            
AX_COMPARE_VERSION([$POSTGRESQL_VERSION],[ge],[$postgresql_version_req],
+                               
[found_postgresql_req_version=yes],[found_postgresql_req_version=no])
+            AC_MSG_RESULT([$found_postgresql_req_version])
+         ])
+         AS_IF([test "Xfound_postgresql_req_version" = "Xno"],[break])
+
+         found_postgresql="yes"
+         break
+       done
+])
 
-AC_DEFUN([AX_LIB_POSTGRESQL],
+AC_DEFUN([_AX_LIB_POSTGRESQL_PKG_CONFIG],
 [
-    AC_ARG_WITH([postgresql],
-        AS_HELP_STRING([--with-postgresql=@<:@ARG@:>@],
-            [use PostgreSQL library @<:@default=yes@:>@, optionally specify 
path to pg_config]
-        ),
-        [
-        if test "$withval" = "no"; then
-            want_postgresql="no"
-        elif test "$withval" = "yes"; then
-            want_postgresql="yes"
-        else
-            want_postgresql="yes"
-            PG_CONFIG="$withval"
-        fi
-        ],
-        [want_postgresql="yes"]
-    )
+  AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+  found_postgresql=no
 
-    POSTGRESQL_CPPFLAGS=""
-    POSTGRESQL_LDFLAGS=""
-    POSTGRESQL_VERSION=""
+  while true; do
+    PKG_PROG_PKG_CONFIG
+    AS_IF([test X$PKG_CONFIG = X],[break])
 
-    dnl
-    dnl Check PostgreSQL libraries (libpq)
-    dnl
+    _AX_LIB_POSTGRESQL_PKG_CONFIG_fail=no;
+    AS_IF([test "X$postgresql_version_req" = "X"],
+         
[PKG_CHECK_EXISTS([libpq],[found_postgresql_pkg_config=yes],[found_postgresql=no])],
+         [PKG_CHECK_EXISTS([libpq >= "$postgresql_version_req"],
+                          [found_postgresql=yes],[found_postgresql=no])])
+    AS_IF([test "X$found_postgresql" = "no"],[break])
+
+    AC_CACHE_CHECK([for the PostgreSQL libraries 
CPPFLAGS],[ac_cv_POSTGRESQL_CPPFLAGS],
+                  [ac_cv_POSTGRESQL_CPPFLAGS="`$PKG_CONFIG libpq 
--cflags-only-I`" || _AX_LIB_POSTGRESQL_PKG_CONFIG_fail=yes])
+    AS_IF([test "X$_AX_LIB_POSTGRESQL_PKG_CONFIG_fail" = "Xyes"],[break])
+    POSTGRESQL_CPPFLAGS="$ac_cv_POSTGRESQL_CPPFLAGS"
 
-    if test "$want_postgresql" = "yes"; then
 
-        if test -z "$PG_CONFIG" -o test; then
-            AC_PATH_PROG([PG_CONFIG], [pg_config], [])
-        fi
+    AC_CACHE_CHECK([for the PostgreSQL libraries 
LDFLAGS],[ac_cv_POSTGRESQL_LDFLAGS],
+                  [ac_cv_POSTGRESQL_LDFLAGS="`$PKG_CONFIG libpq --libs-only-L 
--libs-only-other`" || _AX_LIB_POSTGRESQL_PKG_CONFIG_fail=yes])
+    AS_IF([test "X$_AX_LIB_POSTGRESQL_PKG_CONFIG_fail" = "Xyes"],[break])
+    POSTGRESQL_LDFLAGS="$ac_cv_POSTGRESQL_LDFLAGS"
 
-        if test ! -x "$PG_CONFIG"; then
-            dnl AC_MSG_ERROR([$PG_CONFIG does not exist or it is not an 
exectuable file])
-            PG_CONFIG="no"
-            found_postgresql="no"
-        fi
 
-        if test "$PG_CONFIG" != "no"; then
-            AC_MSG_CHECKING([for PostgreSQL libraries])
+    AC_CACHE_CHECK([for the PostgreSQL libraries LIBS],[ac_cv_POSTGRESQL_LIBS],
+                  [ac_cv_POSTGRESQL_LIBS="`$PKG_CONFIG libpq --libs-only-l`" 
|| _AX_LIB_POSTGRESQL_PKG_CONFIG_fail=ye])
+    AS_IF([test "X$_AX_LIB_POSTGRESQL_PKG_CONFIG_fail" = "Xyes"],[break])
+    POSTGRESQL_LIBS="$ac_cv_POSTGRESQL_LIBS"
 
-            POSTGRESQL_CPPFLAGS="-I`$PG_CONFIG --includedir`"
-            POSTGRESQL_LDFLAGS="-L`$PG_CONFIG --libdir`"
+    dnl already checked by exist but need to be recovered
+    AC_CACHE_CHECK([for the PostgreSQL version],[ac_cv_POSTGRESQL_VERSION],
+                  [ac_cv_POSTGRESQL_VERSION="`$PKG_CONFIG libpq --modversion`" 
|| _AX_LIB_POSTGRESQL_PKG_CONFIG_fail=yes])
+    AS_IF([test "X$_AX_LIB_POSTGRESQL_PKG_CONFIG_fail" = "Xyes"],[break])
+    POSTGRESQL_VERSION="$ac_cv_POSTGRESQL_VERSION"
 
-            POSTGRESQL_VERSION=`$PG_CONFIG --version | sed -e 's#PostgreSQL 
##' | awk '{print $1}'`
+    found_postgresql=yes
+    break;
+  done
 
-            AC_DEFINE([HAVE_POSTGRESQL], [1],
-                [Define to 1 if PostgreSQL libraries are available])
+])
 
-            found_postgresql="yes"
-            AC_MSG_RESULT([yes])
-        else
-            found_postgresql="no"
-            AC_MSG_RESULT([no])
-        fi
-    fi
 
-    dnl
-    dnl Check if required version of PostgreSQL is available
-    dnl
 
+AC_DEFUN([AX_LIB_POSTGRESQL],
+[
+    AC_ARG_WITH([postgresql],
+       AS_HELP_STRING([--with-postgresql=@<:@ARG@:>@],
+           [use PostgreSQL library @<:@default=yes@:>@, optionally specify 
path to pg_config]
+       ),
+       [
+       AS_CASE([$withval],
+               [[[nN]][[oO]]],[want_postgresql="no"],
+               [[[yY]][[eE]][[sS]]],[want_postgresql="yes"],
+               [
+                       want_postgresql="yes"
+                       PG_CONFIG="$withval"
+               ])
+       ],
+       [want_postgresql="yes"]
+    )
+
+    AC_ARG_VAR([POSTGRESQL_CPPFLAGS],[cpp flags for PostgreSQL overriding 
detected flags])
+    AC_ARG_VAR([POSTGRESQL_LIBFLAGS],[libs for PostgreSQL overriding detected 
flags])
+    AC_ARG_VAR([POSTGRESQL_LDFLAGS],[linker flags for PostgreSQL overriding 
detected flags])
+
+    # populate cache
+    AS_IF([test "X$POSTGRESQL_CPPFLAGS" != 
X],[ac_cv_POSTGRESQL_CPPFLAGS="$POSTGRESQL_CPPFLAGS"])
+    AS_IF([test "X$POSTGRESQL_LDFLAGS" != 
X],[ac_cv_POSTGRESQL_LDFLAGS="$POSTGRESQL_LDFLAGS"])
+    AS_IF([test "X$POSTGRESQL_LIBS" != 
X],[ac_cv_POSTGRESQL_LIBS="$POSTGRESQL_LIBS"])
 
     postgresql_version_req=ifelse([$1], [], [], [$1])
+    found_postgresql="no"
 
-    if test "$found_postgresql" = "yes" -a -n "$postgresql_version_req"; then
-
-        AC_MSG_CHECKING([if PostgreSQL version $POSTGRESQL_VERSION is >= 
$postgresql_version_req])
-
-        dnl Decompose required version string of PostgreSQL
-        dnl and calculate its number representation
-        postgresql_version_req_major=`expr $postgresql_version_req : 
'\([[0-9]]*\)'`
-        postgresql_version_req_minor=`expr $postgresql_version_req : 
'[[0-9]]*\.\([[0-9]]*\)'`
-        postgresql_version_req_micro=`expr $postgresql_version_req : 
'[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
-        if test "x$postgresql_version_req_micro" = "x"; then
-            postgresql_version_req_micro="0"
-        fi
-
-        postgresql_version_req_number=`expr $postgresql_version_req_major \* 
1000000 \
-                                   \+ $postgresql_version_req_minor \* 1000 \
-                                   \+ $postgresql_version_req_micro`
-
-        dnl Decompose version string of installed PostgreSQL
-        dnl and calculate its number representation
-        postgresql_version_major=`expr $POSTGRESQL_VERSION : '\([[0-9]]*\)'`
-        postgresql_version_minor=`expr $POSTGRESQL_VERSION : 
'[[0-9]]*\.\([[0-9]]*\)'`
-        postgresql_version_micro=`expr $POSTGRESQL_VERSION : 
'[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
-        if test "x$postgresql_version_micro" = "x"; then
-            postgresql_version_micro="0"
-        fi
-
-        postgresql_version_number=`expr $postgresql_version_major \* 1000000 \
-                                   \+ $postgresql_version_minor \* 1000 \
-                                   \+ $postgresql_version_micro`
-
-        postgresql_version_check=`expr $postgresql_version_number \>\= 
$postgresql_version_req_number`
-        if test "$postgresql_version_check" = "1"; then
-            AC_MSG_RESULT([yes])
-        else
-            AC_MSG_RESULT([no])
-        fi
-    fi
+    POSTGRESQL_VERSION=""
+
+    dnl
+    dnl Check PostgreSQL libraries (libpq)
+    dnl
+    AS_IF([test X"$want_postgresql" = "Xyes"],[
+      _AX_LIB_POSTGRESQL_PKG_CONFIG
+
+
+      AS_IF([test X"$found_postgresql" = "Xno"],
+           [_AX_LIB_POSTGRESQL_OLD])
+
+      AS_IF([test X"$found_postgresql" = Xyes],[
+         _AX_LIB_POSTGRESQL_OLD_CPPFLAGS="$CPPFLAGS"
+         CPPFLAGS="$CPPFLAGS $POSTGRESQL_CPPFLAGS"
+         _AX_LIB_POSTGRESQL_OLD_LDFLAGS="$LDFLAGS"
+         LDFLAGS="$LDFLAGS $POSTGRESQL_LDFLAGS"
+         _AX_LIB_POSTGRESQL_OLD_LIBS="$LIBS"
+         LIBS="$LIBS $POSTGRESQL_LIBS"
+         while true; do
+           dnl try to compile
+           AC_CHECK_HEADER([libpq-fe.h],[],[found_postgresql=no])
+           AS_IF([test "X$found_postgresql" = "Xno"],[break])
+           dnl try now to link
+           AC_CACHE_CHECK([for the PostgreSQL library linking is 
working],[ac_cv_postgresql_found],
+           [
+             AC_LINK_IFELSE([
+               AC_LANG_PROGRAM(
+                 [
+                  #include <libpq-fe.h>
+                 ],
+                 [[
+                   char conninfo[]="dbname = postgres";
+                   PGconn     *conn;
+                   conn = PQconnectdb(conninfo);
+                 ]]
+                )
+               ],[ac_cv_postgresql_found=yes],
+                 [ac_cv_postgresql_found=no])
+            ])
+           found_postgresql="$ac_cv_postgresql_found"
+           AS_IF([test "X$found_postgresql" = "Xno"],[break])
+           break
+       done
+       CPPFLAGS="$_AX_LIB_POSTGRESQL_OLD_CPPFLAGS"
+       LDFLAGS="$_AX_LIB_POSTGRESQL_OLD_LDFLAGS"
+       LIBS="$_AX_LIB_POSTGRESQL_OLD_LIBS"
+       ])
+
+
+      AS_IF([test "x$found_postgresql" = "xyes"],[
+               AC_DEFINE([HAVE_POSTGRESQL], [1],
+                         [Define to 1 if PostgreSQL libraries are available])])
+    ])
 
     AC_SUBST([POSTGRESQL_VERSION])
     AC_SUBST([POSTGRESQL_CPPFLAGS])
     AC_SUBST([POSTGRESQL_LDFLAGS])
+    AC_SUBST([POSTGRESQL_LIBS])
+
+    AS_IF([test "x$found_postgresql" = "xyes"],
+     [ifelse([$2], , :, [$2])],
+     [ifelse([$3], , AS_IF([test X"$want_postgresql" = 
"Xyes"],[AC_MSG_ERROR([Library requirements (PostgreSQL) not met.])],[:]), 
[$3])])
+
 ])
diff --git a/m4/pkg.m4 b/m4/pkg.m4
index f2bfc2d49..4688002e4 100644
--- a/m4/pkg.m4
+++ b/m4/pkg.m4
@@ -1,57 +1,275 @@
+dnl pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
+dnl serial 11 (pkg-config-0.29)
+dnl
+dnl Copyright © 2004 Scott James Remnant <address@hidden>.
+dnl Copyright © 2012-2015 Dan Nicholson <address@hidden>
+dnl
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+dnl General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+dnl 02111-1307, USA.
+dnl
+dnl As a special exception to the GNU General Public License, if you
+dnl distribute this file as part of a program that contains a
+dnl configuration script generated by Autoconf, you may include it under
+dnl the same distribution terms that you use for the rest of that
+dnl program.
 
-dnl PKG_CHECK_MODULES(GSTUFF, gtk+-2.0 >= 1.3 glib = 1.3.4, action-if, 
action-not)
-dnl defines GSTUFF_LIBS, GSTUFF_CFLAGS, see pkg-config man page
-dnl also defines GSTUFF_PKG_ERRORS on error
-AC_DEFUN([PKG_CHECK_MODULES], [
-  succeeded=no
-
-  if test -z "$PKG_CONFIG"; then
-    AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
-  fi
-
-  if test "$PKG_CONFIG" = "no" ; then
-     echo "*** The pkg-config script could not be found. Make sure it is"
-     echo "*** in your path, or set the PKG_CONFIG environment variable"
-     echo "*** to the full path to pkg-config."
-     echo "*** Or see http://www.freedesktop.org/software/pkgconfig to get 
pkg-config."
-  else
-     PKG_CONFIG_MIN_VERSION=0.9.0
-     if $PKG_CONFIG --atleast-pkgconfig-version $PKG_CONFIG_MIN_VERSION; then
-        AC_MSG_CHECKING(for $2)
-
-        if $PKG_CONFIG --exists "$2" ; then
-            AC_MSG_RESULT(yes)
-            succeeded=yes
-
-            AC_MSG_CHECKING($1_CFLAGS)
-            $1_CFLAGS=`$PKG_CONFIG --cflags "$2"`
-            AC_MSG_RESULT($$1_CFLAGS)
-
-            AC_MSG_CHECKING($1_LIBS)
-            $1_LIBS=`$PKG_CONFIG --libs "$2"`
-            AC_MSG_RESULT($$1_LIBS)
-        else
-            $1_CFLAGS=""
-            $1_LIBS=""
-            ## If we have a custom action on failure, don't print errors, but 
-            ## do set a variable so people can do so.
-            $1_PKG_ERRORS=`$PKG_CONFIG --errors-to-stdout --print-errors "$2"`
-            ifelse([$4], ,echo $$1_PKG_ERRORS,)
+dnl PKG_PREREQ(MIN-VERSION)
+dnl -----------------------
+dnl Since: 0.29
+dnl
+dnl Verify that the version of the pkg-config macros are at least
+dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's
+dnl installed version of pkg-config, this checks the developer's version
+dnl of pkg.m4 when generating configure.
+dnl
+dnl To ensure that this macro is defined, also add:
+dnl m4_ifndef([PKG_PREREQ],
+dnl     [m4_fatal([must install pkg-config 0.29 or later before running 
autoconf/autogen])])
+dnl
+dnl See the "Since" comment for each macro you use to see what version
+dnl of the macros you require.
+m4_defun([PKG_PREREQ],
+[m4_define([PKG_MACROS_VERSION], [0.29])
+m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
+    [m4_fatal([pkg.m4 version $1 or higher is required but 
]PKG_MACROS_VERSION[ found])])
+])dnl PKG_PREREQ
+
+dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
+dnl ----------------------------------
+dnl Since: 0.16
+dnl
+dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
+dnl first found in the path. Checks that the version of pkg-config found
+dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
+dnl used since that's the first version where most current features of
+dnl pkg-config existed.
+AC_DEFUN([PKG_PROG_PKG_CONFIG],
+[m4_pattern_forbid([^_?PKG_[A-Z_]+$])
+m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
+m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$])
+AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
+AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
+AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search 
path])
+
+if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
+       AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
+fi
+if test -n "$PKG_CONFIG"; then
+       _pkg_min_version=m4_default([$1], [0.9.0])
+       AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
+       if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
+               AC_MSG_RESULT([yes])
+       else
+               AC_MSG_RESULT([no])
+               PKG_CONFIG=""
+       fi
+fi[]dnl
+])dnl PKG_PROG_PKG_CONFIG
+
+dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl -------------------------------------------------------------------
+dnl Since: 0.18
+dnl
+dnl Check to see whether a particular set of modules exists. Similar to
+dnl PKG_CHECK_MODULES(), but does not set variables or print errors.
+dnl
+dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+dnl only at the first occurence in configure.ac, so if the first place
+dnl it's called might be skipped (such as if it is within an "if", you
+dnl have to call PKG_CHECK_EXISTS manually
+AC_DEFUN([PKG_CHECK_EXISTS],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+if test -n "$PKG_CONFIG" && \
+    AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
+  m4_default([$2], [:])
+m4_ifvaln([$3], [else
+  $3])dnl
+fi])
+
+dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
+dnl ---------------------------------------------
+dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting
+dnl pkg_failed based on the result.
+m4_define([_PKG_CONFIG],
+[if test -n "$$1"; then
+    pkg_cv_[]$1="$$1"
+ elif test -n "$PKG_CONFIG"; then
+    PKG_CHECK_EXISTS([$3],
+                     [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`
+                     test "x$?" != "x0" && pkg_failed=yes ],
+                    [pkg_failed=yes])
+ else
+    pkg_failed=untried
+fi[]dnl
+])dnl _PKG_CONFIG
+
+dnl _PKG_SHORT_ERRORS_SUPPORTED
+dnl ---------------------------
+dnl Internal check to see if pkg-config supports short errors.
+AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
+        _pkg_short_errors_supported=yes
+else
+        _pkg_short_errors_supported=no
+fi[]dnl
+])dnl _PKG_SHORT_ERRORS_SUPPORTED
+
+
+dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
+dnl   [ACTION-IF-NOT-FOUND])
+dnl --------------------------------------------------------------
+dnl Since: 0.4.0
+dnl
+dnl Note that if there is a possibility the first call to
+dnl PKG_CHECK_MODULES might not happen, you should be sure to include an
+dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
+AC_DEFUN([PKG_CHECK_MODULES],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
+AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
+
+pkg_failed=no
+AC_MSG_CHECKING([for $1])
+
+_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
+_PKG_CONFIG([$1][_LIBS], [libs], [$2])
+
+m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables 
$1[]_CFLAGS
+and $1[]_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.])
+
+if test $pkg_failed = yes; then
+       AC_MSG_RESULT([no])
+        _PKG_SHORT_ERRORS_SUPPORTED
+        if test $_pkg_short_errors_supported = yes; then
+               $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors 
--cflags --libs "$2" 2>&1`
+        else 
+               $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs 
"$2" 2>&1`
         fi
+       # Put the nasty error message in config.log where it belongs
+       echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
+
+       m4_default([$4], [AC_MSG_ERROR(
+[Package requirements ($2) were not met:
+
+$$1_PKG_ERRORS
+
+Consider adjusting the PKG_CONFIG_PATH environment variable if you
+installed software in a non-standard prefix.
+
+_PKG_TEXT])[]dnl
+        ])
+elif test $pkg_failed = untried; then
+       AC_MSG_RESULT([no])
+       m4_default([$4], [AC_MSG_FAILURE(
+[The pkg-config script could not be found or is too old.  Make sure it
+is in your PATH or set the PKG_CONFIG environment variable to the full
+path to pkg-config.
+
+_PKG_TEXT
+
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
+        ])
+else
+       $1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
+       $1[]_LIBS=$pkg_cv_[]$1[]_LIBS
+        AC_MSG_RESULT([yes])
+       $3
+fi[]dnl
+])dnl PKG_CHECK_MODULES
+
+
+dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
+dnl   [ACTION-IF-NOT-FOUND])
+dnl ---------------------------------------------------------------------
+dnl Since: 0.29
+dnl
+dnl Checks for existence of MODULES and gathers its build flags with
+dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags
+dnl and VARIABLE-PREFIX_LIBS from --libs.
+dnl
+dnl Note that if there is a possibility the first call to
+dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to
+dnl include an explicit call to PKG_PROG_PKG_CONFIG in your
+dnl configure.ac.
+AC_DEFUN([PKG_CHECK_MODULES_STATIC],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+_save_PKG_CONFIG=$PKG_CONFIG
+PKG_CONFIG="$PKG_CONFIG --static"
+PKG_CHECK_MODULES($@)
+PKG_CONFIG=$_save_PKG_CONFIG[]dnl
+])dnl PKG_CHECK_MODULES_STATIC
+
+
+dnl PKG_INSTALLDIR([DIRECTORY])
+dnl -------------------------
+dnl Since: 0.27
+dnl
+dnl Substitutes the variable pkgconfigdir as the location where a module
+dnl should install pkg-config .pc files. By default the directory is
+dnl $libdir/pkgconfig, but the default can be changed by passing
+dnl DIRECTORY. The user can override through the --with-pkgconfigdir
+dnl parameter.
+AC_DEFUN([PKG_INSTALLDIR],
+[m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])])
+m4_pushdef([pkg_description],
+    [pkg-config installation directory @<:@]pkg_default[@:>@])
+AC_ARG_WITH([pkgconfigdir],
+    [AS_HELP_STRING([--with-pkgconfigdir], pkg_description)],,
+    [with_pkgconfigdir=]pkg_default)
+AC_SUBST([pkgconfigdir], [$with_pkgconfigdir])
+m4_popdef([pkg_default])
+m4_popdef([pkg_description])
+])dnl PKG_INSTALLDIR
+
+
+dnl PKG_NOARCH_INSTALLDIR([DIRECTORY])
+dnl --------------------------------
+dnl Since: 0.27
+dnl
+dnl Substitutes the variable noarch_pkgconfigdir as the location where a
+dnl module should install arch-independent pkg-config .pc files. By
+dnl default the directory is $datadir/pkgconfig, but the default can be
+dnl changed by passing DIRECTORY. The user can override through the
+dnl --with-noarch-pkgconfigdir parameter.
+AC_DEFUN([PKG_NOARCH_INSTALLDIR],
+[m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])])
+m4_pushdef([pkg_description],
+    [pkg-config arch-independent installation directory @<:@]pkg_default[@:>@])
+AC_ARG_WITH([noarch-pkgconfigdir],
+    [AS_HELP_STRING([--with-noarch-pkgconfigdir], pkg_description)],,
+    [with_noarch_pkgconfigdir=]pkg_default)
+AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir])
+m4_popdef([pkg_default])
+m4_popdef([pkg_description])
+])dnl PKG_NOARCH_INSTALLDIR
 
-        AC_SUBST($1_CFLAGS)
-        AC_SUBST($1_LIBS)
-     else
-        echo "*** Your version of pkg-config is too old. You need version 
$PKG_CONFIG_MIN_VERSION or newer."
-        echo "*** See http://www.freedesktop.org/software/pkgconfig";
-     fi
-  fi
 
-  if test $succeeded = yes; then
-     ifelse([$3], , :, [$3])
-  else
-     ifelse([$4], , AC_MSG_ERROR([Library requirements ($2) not met; consider 
adjusting the PKG_CONFIG_PATH environment variable if your libraries are in a 
nonstandard prefix so pkg-config can find them.]), [$4])
-  fi
-])
+dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
+dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl -------------------------------------------
+dnl Since: 0.28
+dnl
+dnl Retrieves the value of the pkg-config variable for the given module.
+AC_DEFUN([PKG_CHECK_VAR],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl
 
+_PKG_CONFIG([$1], [variable="][$3]["], [$2])
+AS_VAR_COPY([$1], [pkg_cv_][$1])
 
+AS_VAR_IF([$1], [""], [$5], [$4])dnl
+])dnl PKG_CHECK_VAR

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