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Re: [paho-dev] ld cannot find lpaho-mqtt3c
Hi,

Not necessarily the specific solution for your problem, but ... maybe the work-around would help you somehow.

I am submitting the Paho C packages for inclusion in Fedora and CentOS. The packages are already in the Fedora updates testing repository and should be available in the stable repositories in a few days. The packages for Paho C will also be available for CentOS soon, but they need maturity time in Fedora before I can push them to CentOS.

Those packages are available in my COPR repository at https://copr.fedorainfracloud.org/coprs/orpiske/paho-testing/. The packages are build for the latest Paho release (1.2.0) and they are the same I submit for inclusion on Fedora/CentOS.

You can install them either via COPR or by directly installing the RPMs (though, it must be said that I never tried on a Centos 6.4, so there's a chance you would need to rebuild the SRPM). 

Kind regards

On Wed, Nov 22, 2017 at 8:15 AM, Heloise Chevalier <hchevalier33@xxxxxxxxx> wrote:

Hi, 

I have trouble compiling a file while linking it to the paho.mqtt.c library. I run gcc -o file file.c -lpaho-mqtt3c  -I src -lpthread -L build/output to compile it, but get a /usr/bin/ld cannot find lpaho-mqtt3c error.

Here is the output from the make install of the library, which shows the symlink has been created, so the problem does not come from that :

mkdir -p build/output/samples
mkdir -p build/output/test
echo OSTYPE is Linux
OSTYPE is Linux
install -m 644  build/output/libpaho-mqtt3c.so.1.0 /usr/local/lib
install -m 644  build/output/libpaho-mqtt3cs.so.1.0 /usr/local/lib
install -m 644  build/output/libpaho-mqtt3a.so.1.0 /usr/local/lib
install -m 644  build/output/libpaho-mqtt3as.so.1.0 /usr/local/lib
install  build/output/MQTTVersion /usr/local/bin
/sbin/ldconfig /usr/local/lib
ln -s libpaho-mqtt3c.so.1 /usr/local/lib/libpaho-mqtt3c.so
ln -s libpaho-mqtt3cs.so.1 /usr/local/lib/libpaho-mqtt3cs.so
ln -s libpaho-mqtt3a.so.1 /usr/local/lib/libpaho-mqtt3a.so
ln -s libpaho-mqtt3as.so.1 /usr/local/lib/libpaho-mqtt3as.so
install -m 644 src/MQTTAsync.h /usr/local/include
install -m 644 src/MQTTClient.h /usr/local/include
install -m 644 src/MQTTClientPersistence.h /usr/local/include

I searched for similar issues already, but none of the solutions given seem to work here. I am working on a computer running CentOS 6.4. What bugs me the most about this is that I already successfully installed and used this library previously on another computer, also running CentOS 6.

Thanks for any help


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Otavio R. Piske
Messaging Quality Assurance Engineer

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