Improve check for ZMQ

1 files changed, 86 insertions, 0 deletions

diff --git a/m4/ax_zmq.m4 b/m4/ax_zmq.m4
new file mode 100644
index 0000000..752dc54
--- /dev/null
+++ b/m4/ax_zmq.m4
@@ -0,0 +1,86 @@
+# ===========================================================================
+#          https://www.gnu.org/software/autoconf-archive/ax_zmq.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_ZMQ([MINIMUM-VERSION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+#
+# DESCRIPTION
+#
+#   Test for the ZMQ libraries of a particular version (or newer). The
+#   default version tested for is 4.0.0.
+#
+#   The macro tests for ZMQ libraries in the library/include path, and, when
+#   provided, also in the path given by --with-zmq.
+#
+#   This macro calls:
+#
+#     AC_SUBST(ZMQ_CPPFLAGS) / AC_SUBST(ZMQ_LDFLAGS) / AC_SUBST(ZMQ_LIBS)
+#
+#   And sets:
+#
+#     HAVE_ZMQ
+#
+# LICENSE
+#
+#   Copyright (c) 2016 Jeroen Meijer <jjgmeijer@gmail.com>
+#
+#   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 2
+
+AC_DEFUN([AX_ZMQ], [
+    AC_ARG_WITH([zmq], [AS_HELP_STRING([--with-zmq=<prefix>],[ZMQ prefix directory])], [
+        ZMQ_LDFLAGS="-L${with_zmq}/lib"
+        ZMQ_CPPFLAGS="-I${with_zmq}/include"
+    ])
+
+    HAVE_ZMQ=0
+    if test "$with_zmq" != "no"; then
+
+        LD_FLAGS="$LDFLAGS $ZMQ_LDFLAGS"
+        CPPFLAGS="$CPPFLAGS $ZMQ_CPPFLAGS"
+
+        AC_LANG_SAVE
+        AC_LANG_C
+        AC_CHECK_HEADER(zmq.h, [zmq_h=yes], [zmq_h=no])
+        AC_LANG_RESTORE
+
+        if test "$zmq_h" = "yes"; then
+            version=ifelse([$1], ,4.0.0,$1)
+            AC_MSG_CHECKING([for ZMQ version >= $version])
+            version=$(echo $version | tr '.' ',')
+            AC_EGREP_CPP([version_ok], [
+#include <zmq.h>
+#if defined(ZMQ_VERSION) && ZMQ_VERSION >= ZMQ_MAKE_VERSION($version)
+    version_ok
+#endif
+            ],[
+                AC_MSG_RESULT(yes)
+                HAVE_ZMQ=1
+                ZMQ_LIBS="-lzmq"
+                AC_SUBST(ZMQ_LDFLAGS)
+                AC_SUBST(ZMQ_CPPFLAGS)
+                AC_SUBST(ZMQ_LIBS)
+            ], AC_MSG_RESULT([no valid ZMQ version was found]))
+        else
+            AC_MSG_WARN([no valid ZMQ installation was found])
+        fi
+
+        if test $HAVE_ZMQ = 1; then
+            # execute ACTION-IF-FOUND (if present):
+            ifelse([$2], , :, [$2])
+        else
+            # execute ACTION-IF-NOT-FOUND (if present):
+            ifelse([$3], , :, [$3])
+        fi
+    else
+        AC_MSG_NOTICE([not checking for ZMQ])
+    fi
+
+    AC_DEFINE(HAVE_ZMQ,,[define if the ZMQ library is available])
+])