[taler-exchange] branch master updated (52a8b8f8 -> b4f7231d)

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ttn pushed a change to branch master
in repository exchange.

    from 52a8b8f8 -code cleanup
     new 98c21a51 Add autoconf macro to check for minimum libmicrohttpd version
     new b4f7231d [build int] Use ‘MHD_VERSION_AT_LEAST’

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Summary of changes:
 configure.ac | 10 +---------
 m4/mhd.m4    | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 9 deletions(-)
 create mode 100644 m4/mhd.m4

diff --git a/configure.ac b/configure.ac
index 5efd4d66..01f1dc20 100644
--- a/configure.ac
+++ b/configure.ac
@@ -291,7 +291,6 @@ AC_CHECK_HEADERS([gnunet/gnunet_sq_lib.h],
 
 
 # check for libmicrohttpd
-microhttpd=0
 AC_MSG_CHECKING([for microhttpd])
 AC_ARG_WITH([microhttpd],
             [AS_HELP_STRING([--with-microhttpd=PFX], [base of microhttpd 
installation])],
@@ -303,14 +302,7 @@ AS_CASE([$with_microhttpd],
         [no], [AC_MSG_ERROR([--with-microhttpd is required])],
         [LDFLAGS="-L$with_microhttpd/lib $LDFLAGS"
          CPPFLAGS="-I$with_microhttpd/include $CPPFLAGS"])
-AC_CHECK_LIB(microhttpd,MHD_start_daemon,
-  [AC_CHECK_HEADER([microhttpd.h],[microhttpd=1])])
-AC_CHECK_DECL([MHD_DAEMON_INFO_CURRENT_CONNECTIONS],,[microhttpd=0],[[#include 
<microhttpd.h>]])
-AS_IF([test $microhttpd = 0],
-  [AC_MSG_ERROR([[
-***
-*** You need libmicrohttpd >= 0.9.39 to build this program.
-*** ]])])
+MHD_VERSION_AT_LEAST([0.9.39])
 
 # check for libjansson (Jansson JSON library)
 jansson=0
diff --git a/m4/mhd.m4 b/m4/mhd.m4
new file mode 100644
index 00000000..40e5b468
--- /dev/null
+++ b/m4/mhd.m4
@@ -0,0 +1,49 @@
+# mhd.m4
+
+#  This file is part of TALER
+#  Copyright (C) 2022 Taler Systems SA
+#
+#  TALER is free software; you can redistribute it and/or modify it under the
+#  terms of the GNU General Public License as published by the Free Software
+#  Foundation; either version 3, or (at your option) any later version.
+#
+#  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
+#  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License along with
+#  TALER; see the file COPYING.  If not, If not, see 
<http://www.gnu.org/license>
+
+# serial 1
+
+dnl MHD_VERSION_AT_LEAST([VERSION])
+dnl
+dnl Check that microhttpd.h can be used to build a program that prints out
+dnl the MHD_VERSION tuple in X.Y.Z format, and that X.Y.Z is greater or equal
+dnl to VERSION.  If not, display message and cause the configure script to
+dnl exit failurefully.
+dnl
+dnl This uses AX_COMPARE_VERSION to do the job.
+dnl It sets shell var mhd_cv_version, as well.
+dnl
+AC_DEFUN([MHD_VERSION_AT_LEAST],
+[AC_CACHE_CHECK([libmicrohttpd version],[mhd_cv_version],
+ [AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+  #include <stdio.h>
+  #include <microhttpd.h>
+]],[[
+  int v = MHD_VERSION;
+  printf ("%x.%x.%x\n",
+          (v >> 24) & 0xff,
+          (v >> 16) & 0xff,
+          (v >>  8) & 0xff);
+]])],
+  [mhd_cv_version=$(./conftest)],
+  [mhd_cv_version=0])])
+AX_COMPARE_VERSION([$mhd_cv_version],[ge],[$1],,
+  [AC_MSG_ERROR([[
+***
+*** You need libmicrohttpd >= $1 to build this program.
+*** ]])])])
+
+# mhd.m4 ends here

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