Re:Common Misconceptions about Compilers
by almostgotcaught on Thursday December 12, 2024 @04:20AM
(#42397597)
> good chunk of LLVM build time
Nah no way it's more than 5%. 5% is definitely a chunk but not big enough that if you made it completely vanish I'd notice. I rebuild LLVM with no cache many times a day (debug, release, all targets, no targets, etc). Debug build takes longer because of all the symbols - LLVM has some enormous symbols due to templating hijinks.
Protips for speeding up building LLVM:
1. LLVM_TARGETS_TO_BUILD=host
2. LLVM_ENABLE_PROJECTS only what you're interested in (do you really care about lld or flang whatever?)
3. Use clang/lld instead of gcc - way better RAM usage
Nah no way it's more than 5%. 5% is definitely a chunk but not big enough that if you made it completely vanish I'd notice. I rebuild LLVM with no cache many times a day (debug, release, all targets, no targets, etc). Debug build takes longer because of all the symbols - LLVM has some enormous symbols due to templating hijinks.
Protips for speeding up building LLVM:
1. LLVM_TARGETS_TO_BUILD=host
2. LLVM_ENABLE_PROJECTS only what you're interested in (do you really care about lld or flang whatever?)
3. Use clang/lld instead of gcc - way better RAM usage
4. Use ccache
4. Disable tests