# Rust git build with llvm-project **URL:** \ **Category:** Uncategorized\ **Created:** [October 12, 2022, 6:36am UTC](https://internals.rust-lang.org/t/rust-git-build-with-llvm-project/17544 "2022-10-12T06:36:13Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![MJU](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/mju/32/9772_2.png) [@MJU](https://internals.rust-lang.org/u/MJU)\ **Post date:** [October 12, 2022, 6:36am UTC](https://internals.rust-lang.org/t/rust-git-build-with-llvm-project/17544/1 "2022-10-12T06:36:13Z")
Hi all! I wonder that llvm-project directory in rust repository. According to the guide, when i modify the source code in llvm-project, it needs to build again after deleting the build folder. Is there a command or option to build only the modified part without deleting the build folder? Have a nice day 🙂 ---
**Author:** ![cuviper](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/cuviper/32/1897_2.png) [@cuviper](https://internals.rust-lang.org/u/cuviper)\ **Post date:** [October 13, 2022, 2:54am UTC](https://internals.rust-lang.org/t/rust-git-build-with-llvm-project/17544/2 "2022-10-13T02:54:38Z")
There's a stamp file named `llvm-finished-building` under the build directory -- if you find and remove that, the rust build will invoke LLVM cmake again. That should allow an incremental rebuild, to the best of cmake's ability. ---
**Author:** ![system](https://sea2.discourse-cdn.com/flex002/user_avatar/internals.rust-lang.org/system/32/14092_2.png) [@system](https://internals.rust-lang.org/u/system)\ **Post date:** [January 11, 2023, 2:54am UTC](https://internals.rust-lang.org/t/rust-git-build-with-llvm-project/17544/3 "2023-01-11T02:54:46Z")
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