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Re: [paho-dev] Building the C++ API/samples
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Sounds good. I have been working on an update - though, admittedly, a
bit slowly. I'd appreciate any feedback.
Frank
On 11/13/2013 04:24 PM, Ian Craggs wrote:
Frank,
I am happy with that approach. It's nice to be able to use recent
language features without having to wait 5 or 6 years! And as you
say, we have the C library to fall back on - after all, the C library
is C rather than C++ because template support just didn't work in gcc
when I started writing the first implementation.
Making it Boost compatible is up to you. Personally I'm more
interested in automated build and tests. And we obviously ought to
make it clear in big letters that it needs C++11 and what the options
are otherwise.
What I would say is that I think before making the C++ library a
"first class" citizen of Paho, we would have to wait until we can
build and test it for Linux at least in the Eclipse build
infrastructure. I'll probably raise a(nother) bug request and see
how that goes down! (I already have a bug open on Windows/Mac builds
which is an ongoing discussion).
Now I'll dig out my own machine with a recent Linux OS on it...
Ian
On 13/11/13 18:53, Frank Pagliughi wrote:
Hello Ian,
Yes, several people asked me about this, particularly people stuck
with an older cross-compiler for an embedded system. Including me, as
it turns out! The earliest GCC I suspect that would work is 4.6. For
Windows, DevStudio 2012 is needed (though I still have to do more
testing on Windows to be sure this works properly).
The implementation makes heavy use of the C++11 libraries - threads,
sync objects, time (chrono), and shared pointers. When we discussed
this prior to my submission last spring, everyone seemed OK to
proceed along these lines as we could "look forward" with the C++
implementation, since people could fall back to the C library if
necessary.
I was, however, going to investigate using Boost for older compilers
- so Boost would *not* be needed (at all) for a C++11 compiler, but
could be used for an older compiler. It has nearly drop-in
replacements for threading, time/chrono, and shared pointer
libraries. I would still need to change/remove a few of the new
language features (nullptr, noexcept, etc).
But without using Boost, the required changes/additions would be a
lot of work.
To be clear, we would not need to ship any boost code (no licensing
issues), but anyone with GCC <= 4.5 or VisualStudio <= 2010, could
still use the Paho C++ library with Boost as an external requirement.
And since Boost can be cross-compiled easily enough, this is a viable
solution for embedded cross-compiled targets.
What do you think of that?
Frank
On 11/13/2013 11:27 AM, Ian Craggs wrote:
Hi Frank,
trying to build the C++ samples on my RedHat workstation, I get the
output included below. At least the first one is presumably due to
the older version of gcc installed (4.4.7-3) - I haven't looked at
the rest yet. But the version of gcc installed on at least one of
the Eclipse build servers is older than that (4.3.4).
Should/could we have a solution for pre C++11 compilers?
Ian
g++ -I.. -I../../../org.eclipse.paho.mqtt.c/src -D_NDEBUG -Wall
-std=c++0x -O2 -o async_publish async_publish.cpp -L../lib
-L../../../org.eclipse.paho.mqtt.c/src/linux_ia64 -lmqttpp -lmqttv3a
In file included from ../mqtt/token.h:32,
from ../mqtt/async_client.h:31,
from async_publish.cpp:23:
../mqtt/exception.h:73: error: expected ‘;’ before ‘noexcept’
../mqtt/exception.h:76: error: expected ‘;’ before ‘}’ token
In file included from ../mqtt/async_client.h:31,
from async_publish.cpp:23:
../mqtt/token.h: In member function ‘bool
mqtt::token::wait_until_completion(const
std::chrono::time_point<_Clock, _Duration1>&)’:
../mqtt/token.h:315: error: expected primary-expression before ‘[’
token
In file included from ../mqtt/async_client.h:35,
from async_publish.cpp:23:
../mqtt/connect_options.h: In constructor
‘mqtt::connect_options::connect_options()’:
../mqtt/connect_options.h:63: error: could not convert ‘{{'M', 'Q',
'T', 'C'}, 2, 60, 1, 10, 0l, 0l, 0l, 30, 20, 0l, 0l, 0, 0l}’ to
‘MQTTAsync_connectOptions’
async_publish.cpp: In function ‘void sleep(int)’:
async_publish.cpp:38: error: ‘sleep_for’ is not a member of
‘std::this_thread’
async_publish.cpp: In function ‘int main(int, char**)’:
async_publish.cpp:143: error: ‘nullptr’ was not declared in this scope
