The Flang doc has a Rosetta Stone for C programmers:
https://flang.llvm.org/docs/FortranForCProgrammers.html
The blog looks very much AI-generated. Judging by the page counter they’ve published O(1000) articles since January 2025.
Thanks @ivanpribec for your vigilance… I have removed the link. 
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Look at how HPCInfo/buildscripts/llvm-git.sh at master · jeffhammond/HPCInfo · GitHub uses LLVM_PARALLEL_LINK_JOBS and LLVM_PARALLEL_COMPILE_JOBS to throttle build parallelism, which is the primary cause of LLVM builds making machines go AWOL due to a DDOS on the virtual memory system. I implemented those features when I was building LLVM on a Raspberry Pi 4, which had just enough memory to link one binary at a time. Prior to using those options, it would go unresponsive, overheat, and die.
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