Error building on Ubuntu

[GersonHMG]

System: Ubuntu 24.04 LTS

I ran the following commands:

sudo apt-get install -y cmake protobuf-compiler libprotobuf-dev qtbase5-dev libqt5opengl5-dev g++ libusb-1.0-0-dev libsdl2-dev libqt5svg5-dev libssl-dev

mkdir build && cd build
cmake ..
make

and the following error appears:

[ 35%] Built target processor_autogen_timestamp_deps
[ 35%] Built target processor_autogen
[ 38%] Built target processor
make[2]: *** No rule to make target 'project_bullet-prefix/lib/libBulletDynamics.a', needed by 'src/amun/simulator/CMakeFiles/simulator_autogen_timestamp_deps'.  Stop.
make[1]: *** [CMakeFiles/Makefile2:1861: src/amun/simulator/CMakeFiles/simulator_autogen_timestamp_deps.dir/all] Error 2
make: *** [Makefile:101: all] Error 2

[paul1999]

Hi, thanks for your bug report and sorry for the late reply; both @owlkward and myself where busy with our thesis.

I can't reproduce the build failure, but I assume its due to a missing dependency related to Bullet in CMake, leading to a build race condition.

Also, does this bug also occur when you use Ninja (Install Instructions) instead of make?

$ mkdir build && cd build
$ cmake -GNinja ..
$ ninja

[paul1999]

I was able to reproduce the issue now. My suggestion to build Bullet manually will not work, since the targets simply do not exist when using Make. I think they only exist when using Ninja due to the BUILD_BYPRODUCTS argument in CMake when setting up Bullet.

This reinforces my feeling, that building with Ninja should work. I will however try and produce a patch to provide a correct dependency for Make as well.

[paul1999]

It will take a while until my patch is published here, as I first commit it in our internal repository, but in the meantime:

If you encounter this issue, you can build the relevant project manually, so for example:

$ make project_bullet
$ make

If you encounter this problem for other dependencies, the name you have to put after project_ is what's given in the error message so for

*** No rule to make target 'project_${xyz}-prefix

you'd do make project_${xyz}