If libzmq is only available as a shared library and not a static one
then cmake fails with:
-- CMake libzmq package not found, trying again with pkg-config (normal install of zeromq)
-- Found PkgConfig: /home/fabrice/buildroot/output/host/bin/pkg-config (found version "0.28")
CMake Error at CMakeLists.txt:20 (message):
ZeroMQ was not found, neither as a CMake package nor via pkg-config
This is due to the fact that ZeroMQ_FOUND is not set to ON even if
ZEROMQ_LIBRARY is TRUE:
if(ZeroMQ_LIBRARY AND ZeroMQ_STATIC_LIBRARY)
set(ZeroMQ_FOUND ON)
endif()
So change AND by OR as suggested in
https://github.com/zeromq/cppzmq/issues/266Fix#266
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
sudo was required for for pkg-config libzmq build as cppzmq could not
find not installed pkg-config libzmq.
Solution: cppzmq to use cmake prefix paths for pkg config paths as well.
and add it to CMAKE_MODULE_PATH on failed load
this allows downstream packages that have loaded cppzmq to call find_package(ZeroMQ) and succeed without shipping their own copy of the fallback.
Additionally, a check for if the libzmq target is defined avoids duplicate definitions when called multiple times
