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Install.md: Update regarding zmq/cppzmq #606

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Install.md: Update regarding zmq/cppzmq #606

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35 changes: 12 additions & 23 deletions INSTALL.md
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Expand Up @@ -45,30 +45,9 @@ Typical output:
-- Installing: /storage/Projects/org.tango/git/cppTango/build/install/include/idl/tango.h
```

## Ubuntu 16.04 compilation problem
## Installing required cppzmq version on older systems

When compiling on Ubuntu 16.04 or on Debian stretch, the following error can occur:

```
[ 17%] Building CXX object cppapi/client/CMakeFiles/client_objects.dir/zmqeventconsumer.cpp.o
/home/ingvord/Projects/org.tango/git/cppTango/cppapi/client/zmqeventconsumer.cpp: In member function ‘virtual void* Tango::ZmqEventConsumer::run_undetached(void*)’:
/home/ingvord/Projects/org.tango/git/cppTango/cppapi/client/zmqeventconsumer.cpp:186:18: error: cannot convert ‘zmq::socket_t’ to ‘void*’ in assignment
items[0].socket = *control_sock;
^
/home/ingvord/Projects/org.tango/git/cppTango/cppapi/client/zmqeventconsumer.cpp:187:18: error: cannot convert ‘zmq::socket_t’ to ‘void*’ in assignment
items[1].socket = *heartbeat_sub_sock;
^
/home/ingvord/Projects/org.tango/git/cppTango/cppapi/client/zmqeventconsumer.cpp:188:18: error: cannot convert ‘zmq::socket_t’ to ‘void*’ in assignment
items[2].socket = *event_sub_sock;
^
/home/ingvord/Projects/org.tango/git/cppTango/cppapi/client/zmqeventconsumer.cpp: In member function ‘bool Tango::ZmqEventConsumer::process_ctrl(zmq::message_t&, zmq::pollitem_t*, int&)’:
/home/ingvord/Projects/org.tango/git/cppTango/cppapi/client/zmqeventconsumer.cpp:1063:47: error: cannot convert ‘zmq::socket_t’ to ‘void*’ in assignment
poll_list[old_poll_nb].socket = *tmp_sock;
```

This is due to incompatibility of zmq.hpp file provided in libzmq3-dev:4.1.7
(ubuntu 16.04), i.e. it is not possible to compile cppTango using zmq.hpp file
provided by libzmq3-dev:4.1.7 (ubuntu 16.04).
On some debian versions, 7 (wheezy) and older, there is no compatible cppzmq version available.

This requires installing [cppzmq](https://github.com/zeromq/cppzmq) via:

Expand All @@ -81,6 +60,16 @@ cmake -DENABLE_DRAFTS=OFF -DCPPZMQ_BUILD_TESTS=OFF ..
sudo make install
```

And then pass `-DCPPZMQ_BASE=/usr/local` to cmake or use

```
mkdir build
cd build
configure CXXFLAGS="-I /usr/local/include" ..
```

when compiling via the tango source distribution.

# Using pkg-config

Once installed cppTango provides [pkg-config](https://en.wikipedia.org/wiki/Pkg-config) file `tango.pc`
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