Missing pkg-config file for cppzmq

[panicgh]

It would be nice for compatibility with pkg-config-based applications, if cppzmq generated a *.pc file like libzmq already does. For someone knowledgeable in CMake (not me) this is probably a trivial task.

Maybe this does the trick:

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1fdf04a..0b49b34 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -87,6 +87,11 @@ write_basic_package_version_file(${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Conf
                                  COMPATIBILITY AnyNewerVersion)
 set(CMAKE_SIZEOF_VOID_P ${CPPZMQ_SIZEOF_VOID_P})
 
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/cppzmq.pc.in
+               ${CMAKE_CURRENT_BINARY_DIR}/cppzmq.pc @ONLY)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/cppzmq.pc
+              DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+
 install(EXPORT ${PROJECT_NAME}-targets
         FILE ${PROJECT_NAME}Targets.cmake
         DESTINATION ${CPPZMQ_CMAKECONFIG_INSTALL_DIR})
diff --git a/cppzmq.pc.in b/cppzmq.pc.in
new file mode 100644
index 0000000..3dc945d
--- /dev/null
+++ b/cppzmq.pc.in
@@ -0,0 +1,9 @@
+prefix="@CMAKE_INSTALL_PREFIX@"
+includedir="@CMAKE_INSTALL_FULL_INCLUDEDIR@"
+
+Name: @PROJECT_NAME@
+Description: C++ binding for libzmq
+URL: https://github.com/zeromq/cppzmq
+Version: @PROJECT_VERSION@
+Requires: libzmq
+Cflags: -I"${includedir}" @pkg_config_defines@
-- 
2.31.1

[panicgh]

related: #477

If cppzmq provided a pc-file, it would be possible to use the libzmq pc-file too and get the correct flags from there.