Even if cURL is already installed in the system CMake clones it and compiles it.

[AlejoDiaz49]

Required Info
Operating System & Version	Ubuntu 20.04
Kernel Version (Linux Only)	5.11.0-43
Platform	PC x86_64
SDK Version	2.50.0

Issue Description

I was updating my system to a newer version of the library, and during the compilation, I noticed that Libcurl is now cloned and compiled.

I have Libcurl (OpenSSL) and also Libcurlpp installed in my system so I was wondering why during compilation it does not try to use it. I only found the file CMake/external_libcurl.cmake and it looks like it doesn't check at all.

Is this for a reason? Otherwise, it could make the first compilation faster and also occupy less space

Also just to make sure that I understood correctly cURL is used when CHECK_FOR_UPDATES is ON and it is for checking new SDK versions. Is it for something else?

Thanks in advanced :)

[MartyG-RealSense]

Hi @AlejoDiaz49 I should emphasize in advance that this is a development-focused question, so my knowledge of this subject is limited. I will do my best to provide useful information though.

• From SDK version 2.43.0 onwards, it looks as though a mechanism is introduced to ensure that the libcurl third-party is version 7.75 as a requirement.

#8463

• It looks as though the link library targets ws2_32.lib crypt32.lib, ELSE it tries to find_package openSSL if it is not found.

• There is a CMake build flag called DCHECK_FOR_UPDATES that can be set to Off. This is so that Mac users can disable it.

-DCHECK_FOR_UPDATES=OFF

#9732

• The link below to the main CMakeLists.txt file highlights what is is performed in relation to realsense-viewer when CHECK_FOR_UPDATES is true.

https://github.com/IntelRealSense/librealsense/blob/master/tools/realsense-viewer/CMakeLists.txt#L235

[MartyG-RealSense]

Hi @AlejoDiaz49 Do you require further assistance with this case, please? Thanks!

[MartyG-RealSense]

Case closed due to no further comments received.