./build.sh about orb_slam3

[thuliangjz]

@belal-ibrahim it seems you need to have openssl installed. Try using apt-get install libssl-dev. About another error, it seems stl complains about the allocator defined there, in include/LoopClosing.h:50, you can see:

typedef map<KeyFrame*,g2o::Sim3,std::less<KeyFrame*>,
        Eigen::aligned_allocator<std::pair<const KeyFrame*, g2o::Sim3> > > KeyFrameAndPose;

I wonder if it will works by deleting the const keyword there, as your compiler argues. However I am not able to reproduce the error on my laptop, so you may as well post your compiler version, like gcc, g++, as well as that of cmake and (possibly) Eigen library :)

[dimaxano]

Hi! These lines are insufficient to provide some help. Paste, please, the whole script output

[thuliangjz]

I suggest adding a line

set -e

at the begining of the build.sh and run bash build.sh instead of running ./build.sh directly so that bash stops executing upon any error. Also as @dimaxano said you should copy the entire output of cmake to let us see what's wrong with building (unsatisified requirements or compilation error etc)

[belal-ibrahim]

that's my output error
make[2]: *** [CMakeFiles/ORB_SLAM3.dir/build.make:102: CMakeFiles/ORB_SLAM3.dir/src/LoopClosing.cc.o] Error 1
/home/beraru/ORB_SLAM3/src/Tracking.cc: In member function ‘void ORB_SLAM3::Tracking::Track()’:
/home/beraru/ORB_SLAM3/src/Tracking.cc:1155:13: warning: ‘bOK’ may be used uninitialized in this function [-Wmaybe-uninitialized]
1155 | if(bOK)
| ^~
make[2]: *** [CMakeFiles/ORB_SLAM3.dir/build.make:232: CMakeFiles/ORB_SLAM3.dir/src/Optimizer.cc.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:390: CMakeFiles/ORB_SLAM3.dir/all] Error 2
make: *** [Makefile:84: all] Error 2

[thuliangjz]

@belal-ibrahim it seems you have trouble building LoopClosing.cc and Optimizer.cc. However I cannot see what exactly the error is, please provide the full output of your building script output.

[belal-ibrahim]

libssl-dev is already the newest version (1.1.1f-1ubuntu2)
gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2)
cmake version 3.16.3
Eigen version 3.3.4

[jj-gomez]

Hi @mengdejiang, as others have already noted, you provide with little/no information about you error. Could you please post the full output you get when building the system?

@belal-ibrahim, I would ask you next time only post the error messages and not all the warnings (either by modifiying the compiler flags at CMakeLists.txt or by only copying the error lines) to facilitate the readability of the message.

Regarding your problem, it looks like a problem when finding the file openssl/md5.h. You should first install in your system the openssl library (https://cloudwafer.com/blog/installing-openssl-on-ubuntu-16-04-18-04/). If after this, errors keep poping up, please copy us the error messages you are getting!