Rebuild when clang_sys environment changes

1 files changed, 7 insertions, 0 deletions

diff --git a/build.rs b/build.rs
index acae6d67..5d2b9df6 100644
--- a/build.rs
+++ b/build.rs
@@ -42,6 +42,13 @@ mod testgen {
 
         println!("cargo:rerun-if-changed=tests/headers");
 
+        // On behalf of clang_sys, rebuild ourselves if important configuration
+        // variables change, to ensure that bindings get rebuilt if the
+        // underlying libclang changes.
+        println!("cargo:rerun-if-env-changed=LLVM_CONFIG_PATH");
+        println!("cargo:rerun-if-env-changed=LIBCLANG_PATH");
+        println!("cargo:rerun-if-env-changed=LIBCLANG_STATIC_PATH");
+
         for entry in entries {
             match entry.path().extension().and_then(OsStr::to_str) {
                 Some("h") | Some("hpp") => {