From 649d10b2756bda49694d380e82154a96dde98670 Mon Sep 17 00:00:00 2001
From: Alessio Vanni <vannilla@firemail.cc>
Date: Tue, 27 Jul 2021 16:27:14 +0200
Subject: Autoconf macro to detect GNUnet installations

---
 contrib/Makefile.am |  4 ++++
 contrib/gnunet.m4   | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 contrib/gnunet.m4

(limited to 'contrib')

diff --git a/contrib/Makefile.am b/contrib/Makefile.am
index f42fb684d..150e47ff0 100644
--- a/contrib/Makefile.am
+++ b/contrib/Makefile.am
@@ -53,6 +53,7 @@ EXTRA_DIST = \
  conf/gnunet/gnunet-user.conf \
  conf/nss/nssswitch.conf \
  conf/wireshark/wireshark.lua \
+ gnunet.m4 \
  $(PACKAGES_FILES) \
  $(INITD_FILES) \
  Makefile.inc \
@@ -77,3 +78,6 @@ test_gnunet_prefix_LDADD = \
   $(LTLIBICONV) \
   $(GN_LIBINTL) \
   $(LIBLTDL) -lunistring $(XLIB)
+
+aclocaldir = $(datadir)/aclocal
+aclocal_DATA = gnunet.m4
diff --git a/contrib/gnunet.m4 b/contrib/gnunet.m4
new file mode 100644
index 000000000..fe70fbde1
--- /dev/null
+++ b/contrib/gnunet.m4
@@ -0,0 +1,63 @@
+# Autoconf macro for working with GNUnet
+# This file is in the public domain.
+#
+# AM_PATH_GNUNET([MINIMUM-VERSION = 0.14.2, [ACTION-IF-FOUND, [ACTION-IF-NOT-FOUND]]])
+# Find the GNUnet installation, either automatically or through the
+# --with-gnunet-prefix flag
+#
+# This macro runs the pkg-config and, if needed, the gnunet-config tool
+# provided by GNUnet itself.
+#
+# The gnunet-config tool can be overridden by setting the GNUNET_CONFIG
+# variable before executing the configure script.
+#
+# The variables GNUNET_CFLAGS and GNUNET_LIBS will be set to appropriate
+# values and are made available to Automake.
+AC_DEFUN([AM_PATH_GNUNET],
+[AC_ARG_WITH([gnunet-prefix],
+             [AS_HELP_STRING([--with-gnunet-prefix=PATH],
+                             [PATH to the GNUnet installation])],
+             [gnunet_prefix="$withval"],
+             [gnunet_prefix=""])
+ AC_ARG_VAR([GNUNET_CONFIG],[The gnunet-config tool])
+ min_gnunet_version=m4_if([$1], ,0.14.2,$1)
+ # Make sure the specified version is at least the version with
+ # the features required to use this macro
+ AS_VERSION_COMPARE([$min_gnunet_version],[0.14.2],
+                    [AC_MSG_WARN([The specified GNUnet version $min_gnunet_version is too old.])
+                     AC_MSG_WARN([The minimum version has been set to 0.14.2])
+                     min_gnunet_version="0.14.2"])
+ AS_IF([test "x${GNUNET_CONFIG+set}" != "xset"],
+       [PKG_CHECK_MODULES([GNUNET],[gnunetutil >= $min_gnunet_version],
+                          [gnunet_pkgconfig=yes],[gnunet_pkgconfig=no])
+        AS_IF([test "x$gnunet_pkgconfig" = "xno" && test "x$gnunet_prefix" != "x"],
+              [gnunet_PATH="$PATH"
+               AS_IF([test "x$prefix" != "xNONE"],
+                     [gnunet_PATH="$prefix/bin${PATH_SEPARATOR}$prefix/usr/bin"])
+               AC_PATH_PROG([GNUNET_CONFIG],[gnunet-config],[no],[$gnunet_PATH])
+               AS_UNSET([gnunet_PATH])],
+              [GNUNET_CONFIG="pkg-config gnunetutil"])])
+ AC_MSG_CHECKING([if GNUnet version is >= $min_gnunet_version])
+ gnunet_result=no
+ AS_IF([test "x$GNUNET_CONFIG" != "xno" && test -n "$GNUNET_CONFIG"],
+       [gnunet_version=`$GNUNET_CONFIG --version | tr ' ' '\n' | sed -n '2p'`
+        AS_VERSION_COMPARE([$gnunet_version],[$min_gnunet_version],
+                           [gnunet_result=no],
+                           [gnunet_result=yes],
+                           [gnunet_result=yes])
+        AS_UNSET([gnunet_version])])
+ AS_IF([test "x$gnunet_result" != "xyes"],
+       [AC_MSG_RESULT([no])
+        m4_if([$3], ,:,[$3])],
+       [AC_MSG_RESULT([yes])
+        m4_if([$2], ,:,[$2])
+        AC_CHECK_HEADERS([sys/socket.h netinet/in.h byteswap.h])
+        AS_IF([test "x${GNUNET_CFLAGS+set}" != "xset"],
+              [GNUNET_CFLAGS=`$GNUNET_CONFIG --cflags`
+              AC_SUBST([GNUNET_CFLAGS])])
+        AS_IF([test "x${GNUNET_LIBS+set}" != "xset"],
+              [GNUNET_LIBS=`$GNUNET_CONFIG --libs`
+               AC_SUBST([GNUNET_LIBS])])])
+ AS_UNSET([gnunet_result])
+ AS_UNSET([min_gnunet_version])
+])
-- 
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