[Build error] When I build this project on Ubuntu18.04LTS, it will fail

[ykk136]

Thanks for your great software. I encounter some issues when I build this project on Ubuntu18.04 LTS.

1. Firstly, I use "cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo .." to get required cmake dependencies, and then use "cmake --build ." to build this project, but so many errors occur just like:

2. Secondly, I clean the build directory, and use "cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DKLOGG_USE_HYPERSCAN=OFF ..", and I can build it successfully, but when I open a log file, it will crash and output segmentation fault.

[ykk136]

And I confirmed that my AMD CPU does support ssse3.

[variar]

Could you provide the output of lscpu? It does look like some cpu instruction is enabled in build but missing from physical cpu, could be popcnt

[ykk136]

Thanks for your comment, I used lscpu, and the result is:

Is there any way to solve this build issue?

[variar]

Thanks for lscpu. That cpu has all required instructions. What compiler are you using? Could you attach the output of clean cmake configuration step?

[ykk136]

For the compilation environment, I list all the tools as:

1. gcc / g++: 7.5.0

2. cmake: 3.20

3. libboost: 1.65

4. Ragel: 6.10

And I rebuild the project, it seems that these errors occur when the build process reaches end point

And I tried to clean the output of cmake using cmake --build ./ --target clean, no output info, and I checked that the /build_root/output dir is cleaned.

[variar]

The build tools are the same as in ubuntu 18.04 docker container. Could you try passing -DKLOGG_USE_LTO=OFF to cmake? That should disable link time optimizations, and that is used for klogg builds for ubuntu 18.04 in ci pipleline.

[ykk136]

The build tools are the same as in ubuntu 18.04 docker container. Could you try passing -DKLOGG_USE_LTO=OFF to cmake? That should disable link time optimizations, and that is used for klogg builds for ubuntu 18.04 in ci pipleline.

Thanks for the info, but I tried it and not helpful. Finally I found that we must using -DKLOGG_GENERIC_CPU=ON to the cmake, then it would be okay

[ykk136]

One more question about Generic_CPU flag. What is the difference between ucm_add_flags(C CXX "-march=x86-64 -mtune=generic") and ucm_add_flags(C CXX "-march=native -mtune=generic")? Will it imapct the final performance of KLogg?