Problem: libzmq installed during build

There is no need to install libzmq into the system.
Out of source build can be used later to build cppzmq.

Solution: remove install steps and rely more on cmake to handle
directory creation.

ci_build.sh

@@ -4,27 +4,18 @@ set -x
 set -e
 
 if [ "$DRAFT" = "1" ] ; then
-    # if we enable drafts during the libzmq cmake build, the pkgconfig 
-    # data should set ZMQ_BUILD_DRAFT_API in dependent builds, but this 
+    # if we enable drafts during the libzmq cmake build, the pkgconfig
+    # data should set ZMQ_BUILD_DRAFT_API in dependent builds, but this
     # does not appear to work (TODO)
     export ZEROMQ_CMAKE_FLAGS="-DENABLE_DRAFTS=ON"
 fi
 
 install_zeromq() {
-    pushd .
-
-    mkdir libzmq
-    cd libzmq
-    curl -L https://github.com/zeromq/libzmq/archive/v${ZMQ_VERSION}.tar.gz >zeromq.tar.gz
+    curl -L https://github.com/zeromq/libzmq/archive/v${ZMQ_VERSION}.tar.gz \
+      >zeromq.tar.gz
     tar -xvzf zeromq.tar.gz
-    cd libzmq-${ZMQ_VERSION}
-
-    mkdir build
-    cd build
-    cmake .. ${ZEROMQ_CMAKE_FLAGS}
-    sudo make -j4 install
-
-    popd
+    cmake -Hlibzmq-${ZMQ_VERSION} -Blibzmq ${ZEROMQ_CMAKE_FLAGS}
+    cmake --build libzmq
 }
 
 # build zeromq first
@@ -32,20 +23,15 @@ install_zeromq() {
 if [ "${ZMQ_VERSION}" != "" ] ; then install_zeromq ; fi
 
 # build cppzmq
-
 pushd .
-mkdir build
+ZeroMQ_DIR=libzmq cmake -H. -Bbuild ${ZEROMQ_CMAKE_FLAGS}
+cmake --build build
 cd build
-cmake .. ${ZEROMQ_CMAKE_FLAGS}
-cmake --build .
-sudo make -j4 install
-make test ARGS="-V"
+ctest -V
 popd
 
 # build cppzmq demo
-cd demo
-mkdir build
-cd build
-cmake ..
-cmake --build .
+ZeroMQ_DIR=libzmq cppzmq_DIR=build cmake -Hdemo -Bdemo/build
+cmake --build demo/build
+cd demo/build
 ctest

demo/CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
 
 project(cppzmq-demo CXX)
 
-find_package(cppzmq)
+find_package(cppzmq REQUIRED)
 
 enable_testing()
 add_executable(
@@ -12,9 +12,11 @@ add_executable(
 
 target_link_libraries(
     demo
-    libzmq
+    cppzmq
     )
 
+include_directories(${ZeroMQ_INCLUDE_DIR} ${cppzmq_INCLUDE_DIR})
+
 add_test(
   NAME
     demo