Merge branch 'enhance-bare-makefile-static-library-build' of https://github.com/Lance0312/mosquitto into Lance0312-enhance-bare-makefile-static-library-build

Enhance static library build

The option WITH_STATIC_LIBRARIES is default to yes

Signed-off-by: Lance Chen <cyen0312@gmail.com>

to conform to the bare Makefiles

Signed-off-by: Lance Chen <cyen0312@gmail.com>

In order to make the CPP static library include all
objects from the C static library, the list of objects
(MOSQ_OBJS) is isolated into objects.mk to be used for
building the C and CPP static libraries.

Signed-off-by: Lance Chen <cyen0312@gmail.com>

Symbol stripping is done explicitly with strip command,
since stripping with install command removes too many
symbols, making the result library unusable.

Signed-off-by: Lance Chen <cyen0312@gmail.com>

The CPP static library respects options
BUILD_STATIC_LIBRARY and WITH_PIC as well.

Signed-off-by: Lance Chen <cyen0312@gmail.com>

The option WITH_PIC is default to OFF.

By default, the static library is built from the
source code directly. If WITH_PIC is enabled, the
static library is built with the same set of
object libraries that the shared library uses.

To link Mosquitto static library into a shared
library, one must enable WITH_PIC to make the
piece of code locatable.

Signed-off-by: Lance Chen <cyen0312@gmail.com>

The BUILD_STATIC_LIBRARY option is default to ON.

Signed-off-by: Lance Chen <cyen0312@gmail.com>

The shared library fails to link to `handle*` functions
implementd in lib/handle_* because these source file
definitions seem to be removed accidentally in commit
3499c094

.

Signed-off-by: Lance Chen <cyen0312@gmail.com>

Improve performance with lots of queued message

CMake improvements

Signed-off-by: Ian Johnson <ijohnson@wolfram.com>

Putting the list of files into a variable C_SRC and modiftying the add_library calls to use this variable

Signed-off-by: Ian Johnson <ijohnson@wolfram.com>

We don't want to add any declaration properties for the static library, as the static library doesn't export or import anything, so when STATIC_LIB is defined the libmosq_EXPORT defines to nothing

Signed-off-by: Ian Johnson <ijohnson@wolfram.com>

Adding the static library target, libmosquitto_static, to CMakeLists.txt so it gets installed, and when compiled STATIC_LIB gets defined for only the static library

Signed-off-by: Ian Johnson <ijohnson@wolfram.com>

Signed-off-by: Ian Johnson <ijohnson@wolfram.com>

Signed-off-by: Ian Johnson <ijohnson@wolfram.com>

Config file is installed by default, so I would expect that it will be used by
the systemd service. Add argument for the configuration to the services.

Signed-off-by: Tomas Novotny <novotny@rehivetech.com>

Signed-off-by: Pierre Fersing <pierre.fersing@bleemeo.com>

Split message queue in two queues: in-flight and queued to avoid the
need to iterate over all messages.

Signed-off-by: Pierre Fersing <pierre.fersing@bleemeo.com>

[ci skip]

This may be useful for finding out which clients are using significant
amounts of persistence space.

Closes #3.