[llvm] [cmake] Option to create Ninja job pools depending on available resources (PR #65274)

[Saleem Abdulrasool via llvm-commits]

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@@ -47,6 +62,17 @@ endif()
 
 set(LLVM_PARALLEL_LINK_JOBS "" CACHE STRING
   "Define the maximum number of concurrent link jobs (Ninja only).")
+if(LLVM_RAM_PER_LINK_JOB)
+  math(EXPR memory_available_jobs "${available_physical_memory} / ${LLVM_RAM_PER_LINK_JOB}" OUTPUT_FORMAT DECIMAL)
+  if (memory_available_jobs LESS 1)
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compnerd wrote:

Similar

https://github.com/llvm/llvm-project/pull/65274