Problem: version detection broken, confuses libzmq and cppzmq versions

Solution: Fix version detection and cmake syntax errors
Fixes #182

.travis.yml

@@ -30,5 +30,4 @@ sudo: required
 
 # Build and check this project according to the BUILD_TYPE
 script: 
-  - chmod +x ci_build.sh
   - ./ci_build.sh

CMakeLists.txt

@@ -1,7 +1,12 @@
 cmake_minimum_required(VERSION 3.0.0)
-project(cppzmq)
 
-find_package(ZeroMQ QUIET)
+list (APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+
+include (DetectCPPZMQVersion)
+
+project(cppzmq VERSION ${DETECTED_CPPZMQ_VERSION})
+
+find_package(ZeroMQ)
 
 # libzmq autotools install: fallback to pkg-config
 if(NOT ZeroMQ_FOUND)
@@ -14,8 +19,7 @@ if (ZeroMQ_FOUND AND (NOT TARGET libzmq OR NOT TARGET libzmq-static))
   message(FATAL_ERROR "ZeroMQ version not supported!")
 endif()
 
-set (${PROJECT_NAME}_VERSION ${ZeroMQ_VERSION})
-message(STATUS "cppzmq v${${PROJECT_NAME}_VERSION}")
+message(STATUS "cppzmq v${CPPZMQ_VERSION}")
 
 set(CPPZMQ_HEADERS
     zmq.hpp
@@ -43,15 +47,13 @@ install(FILES ${CPPZMQ_HEADERS}
 # GNUInstallDirs "DATADIR" wrong here; CMake search path wants "share".
 set(CPPZMQ_CMAKECONFIG_INSTALL_DIR "share/cmake/${PROJECT_NAME}" CACHE STRING "install path for cppzmqConfig.cmake")
 
-if (NOT CMAKE_VERSION VERSION_LESS 3.0)
-  export(EXPORT ${PROJECT_NAME}-targets
+export(EXPORT ${PROJECT_NAME}-targets
      FILE "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Targets.cmake")
-endif()
 configure_package_config_file(${PROJECT_NAME}Config.cmake.in
                               "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
                               INSTALL_DESTINATION ${CPPZMQ_CMAKECONFIG_INSTALL_DIR})
 write_basic_package_version_file(${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
-                                 VERSION ${${PROJECT_NAME}_VERSION}
+                                 VERSION ${CPPZMQ_VERSION}}
                                  COMPATIBILITY AnyNewerVersion)
 install(EXPORT ${PROJECT_NAME}-targets
         FILE ${PROJECT_NAME}Targets.cmake

cmake/DetectCPPZMQVersion.cmake

@@ -0,0 +1,8 @@
+
+file(READ "${CMAKE_CURRENT_SOURCE_DIR}/zmq.hpp" _CPPZMQ_H_CONTENTS)
+string(REGEX REPLACE ".*#define CPPZMQ_VERSION_MAJOR ([0-9]+).*" "\\1" DETECTED_CPPZMQ_VERSION_MAJOR "${_CPPZMQ_H_CONTENTS}")
+string(REGEX REPLACE ".*#define CPPZMQ_VERSION_MINOR ([0-9]+).*" "\\1" DETECTED_CPPZMQ_VERSION_MINOR "${_CPPZMQ_H_CONTENTS}")
+string(REGEX REPLACE ".*#define CPPZMQ_VERSION_PATCH ([0-9]+).*" "\\1" DETECTED_CPPZMQ_VERSION_PATCH "${_CPPZMQ_H_CONTENTS}")
+set(DETECTED_CPPZMQ_VERSION "${DETECTED_CPPZMQ_VERSION_MAJOR}.${DETECTED_CPPZMQ_VERSION_MINOR}.${DETECTED_CPPZMQ_VERSION_PATCH}")
+
+message(STATUS "Detected CPPZMQ Version - ${DETECTED_CPPZMQ_VERSION}")

version.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# This script extracts the 0MQ version from zmq.hpp, which is the master
+# location for this information.
+#
+if [ ! -f zmq.hpp ]; then
+    echo "version.sh: error: zmq.hpp does not exist" 1>&2
+    exit 1
+fi
+MAJOR=$(grep '^#define CPPZMQ_VERSION_MAJOR \+[0-9]\+' zmq.hpp)
+MINOR=$(grep '^#define CPPZMQ_VERSION_MINOR \+[0-9]\+' zmq.hpp)
+PATCH=$(grep '^#define CPPZMQ_VERSION_PATCH \+[0-9]\+' zmq.hpp)
+if [ -z "$MAJOR" -o -z "$MINOR" -o -z "$PATCH" ]; then
+    echo "version.sh: error: could not extract version from zmq.hpp" 1>&2
+    exit 1
+fi
+MAJOR=$(echo $MAJOR | awk '{ print $3 }')
+MINOR=$(echo $MINOR | awk '{ print $3 }')
+PATCH=$(echo $PATCH | awk '{ print $3 }')
+echo $MAJOR.$MINOR.$PATCH | tr -d '\n\r'
+

zmq.hpp

@@ -53,6 +53,13 @@
 #include <string>
 #include <vector>
 
+/*  Version macros for compile-time API version detection                     */
+#define CPPZMQ_VERSION_MAJOR 4
+#define CPPZMQ_VERSION_MINOR 3
+#define CPPZMQ_VERSION_PATCH 0
+
+#define CPPZMQ_VERSION                                                            \
+    ZMQ_MAKE_VERSION (CPPZMQ_VERSION_MAJOR, CPPZMQ_VERSION_MINOR, CPPZMQ_VERSION_PATCH)
 
 #ifdef ZMQ_CPP11
     #include <chrono>