Problem: libzmq builds with tests

libzmq build with default settings now which build all the tests and
performance tools. This is not required for cppzmq build and slows down
it only.

Solution: disable tests build for libzmq and make it release only.

ci_build.sh

@@ -10,12 +10,17 @@ if [ "$DRAFT" = "1" ] ; then
     export ZEROMQ_CMAKE_FLAGS="-DENABLE_DRAFTS=ON"
 fi
 
+LIBZMQ=${PWD}/libzmq-build
+CPPZMQ=${PWD}/cppzmq-build
 install_zeromq() {
     curl -L https://github.com/zeromq/libzmq/archive/v${ZMQ_VERSION}.tar.gz \
       >zeromq.tar.gz
     tar -xvzf zeromq.tar.gz
-    cmake -Hlibzmq-${ZMQ_VERSION} -Blibzmq ${ZEROMQ_CMAKE_FLAGS}
-    cmake --build libzmq
+    cmake -Hlibzmq-${ZMQ_VERSION} -B${LIBZMQ} -DWITH_PERF_TOOL=OFF \
+                                              -DZMQ_BUILD_TESTS=OFF \
+                                              -DCMAKE_BUILD_TYPE=Release \
+                                              ${ZEROMQ_CMAKE_FLAGS}
+    cmake --build ${LIBZMQ}
 }
 
 # build zeromq first
@@ -24,14 +29,14 @@ if [ "${ZMQ_VERSION}" != "" ] ; then install_zeromq ; fi
 
 # build cppzmq
 pushd .
-ZeroMQ_DIR=libzmq cmake -H. -Bbuild ${ZEROMQ_CMAKE_FLAGS}
-cmake --build build
-cd build
+ZeroMQ_DIR=${LIBZMQ} cmake -H. -B${CPPZMQ} ${ZEROMQ_CMAKE_FLAGS}
+cmake --build ${CPPZMQ}
+cd ${CPPZMQ}
 ctest -V
 popd
 
 # build cppzmq demo
-ZeroMQ_DIR=libzmq cppzmq_DIR=build cmake -Hdemo -Bdemo/build
+ZeroMQ_DIR=${LIBZMQ} cppzmq_DIR=${CPPZMQ} cmake -Hdemo -Bdemo/build
 cmake --build demo/build
 cd demo/build
 ctest

demo/CMakeLists.txt

@@ -15,7 +15,8 @@ target_link_libraries(
     cppzmq
     )
 
-include_directories(${ZeroMQ_INCLUDE_DIR} ${cppzmq_INCLUDE_DIR})
+target_include_directories(demo PRIVATE ${cppzmq_INCLUDE_DIR}
+                                        ${ZeroMQ_INCLUDE_DIR})
 
 add_test(
   NAME

tests/CMakeLists.txt

@@ -33,10 +33,11 @@ add_executable(
 target_link_libraries(
     unit_tests
     gtest_main
-    libzmq
+    cppzmq
     )
 
-target_include_directories(unit_tests PRIVATE ..)
+target_include_directories(unit_tests PRIVATE ${cppzmq_INCLUDE_DIR}
+                                              ${ZeroMQ_INCLUDE_DIR})
 
 add_test(
   NAME