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authorMark Mansi <markm@cs.wisc.edu>2019-06-15 16:08:35 -0500
committerWho? Me?! <mark-i-m@users.noreply.github.com>2019-06-15 16:30:28 -0500
commit1e6ab9e7ffc3b2833111a7f1531a36105c0a6faa (patch)
treef22215ea0b5e11120c1cf147c35ad577431a7d3f /src/doc/rustc-dev-guide
parentb394ba60aea18186ad7647607a50d55a447a0957 (diff)
add note about rebuilding llvm
Diffstat (limited to 'src/doc/rustc-dev-guide')
-rw-r--r--src/doc/rustc-dev-guide/src/how-to-build-and-run.md4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/doc/rustc-dev-guide/src/how-to-build-and-run.md b/src/doc/rustc-dev-guide/src/how-to-build-and-run.md
index 92fbcb0fd8a..84efffc84b8 100644
--- a/src/doc/rustc-dev-guide/src/how-to-build-and-run.md
+++ b/src/doc/rustc-dev-guide/src/how-to-build-and-run.md
@@ -42,7 +42,9 @@ debug = true
 ```
 
 If you have already built `rustc`, then you may have to execute `rm -rf build` for subsequent
-configuration changes to take effect.
+configuration changes to take effect. Note that `./x.py clean` will not cause a
+rebuild of LLVM, so if your configuration change affects LLVM, you will need to
+manually `rm -rf build/` before rebuilding.
 
 ### What is `x.py`?