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Performance improvement on LLVM build time #20

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Performance improvement on LLVM build time #20

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7 changes: 6 additions & 1 deletion utils/build_llvm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,12 @@
import sys


# It references the commit day so we can shallow clone
# and still manage to checkout this specific revision.
# NOTE: The revision date must be the day before the
# actual commit date.
_LLVM_REV = "c179d7b006348005d2da228aed4c3c251590baa3"
_LLVM_REV_DATE = "2018-10-08"


def parse_args():
Expand Down Expand Up @@ -166,7 +171,7 @@ def main():
print("Cloning LLVM into {}".format(args.llvm_src_dir))
run_command(
git
+ ["clone", "https://github.com/llvm-mirror/llvm.git", args.llvm_src_dir]
+ ["clone", "--shallow-since", _LLVM_REV_DATE, "https://github.com/llvm-mirror/llvm.git", args.llvm_src_dir]
)

# Checkout a specific revision in LLVM.
Expand Down