mac: Clobber pch files after clang updates.

tools/clang/scripts/update.sh

Index: tools/clang/scripts/update.sh
diff --git a/tools/clang/scripts/update.sh b/tools/clang/scripts/update.sh
index f3a261b4e4a955899875baa0b07796e26e968cd7..e4bf68b22af9b0d2fd51d5cfa1c926587ffdb5cc 100755
--- a/tools/clang/scripts/update.sh
+++ b/tools/clang/scripts/update.sh
@@ -60,6 +60,24 @@ fi
 # To always force a new build if someone interrupts their build half way.
 rm -f "${STAMP_FILE}"
 
+# Clobber pch files, since they only work with the compiler version that
+# created them.
+if [[ "$(uname -s)" = "Darwin" ]]; then

[Nico, 2011/09/14 21:31:34]

I'll switch this to ${OS} once that other CL is in and I have rebased.

+  XCODEBUILD_DIR="${THIS_DIR}/../../../xcodebuild"
+  MAKE_DIR="${THIS_DIR}/../../../out"
+  for CONFIG in Debug Release; do
+    if [[ -d "${MAKE_DIR}/${CONFIG}" ]]; then
+      echo "Clobbering ${CONFIG} PCH files for make build"
+      find "${MAKE_DIR}/${CONFIG}/obj.target" -name '*.gch' | xargs rm
+    fi
+
+    if [[ -d "${XCODEBUILD_DIR}/${CONFIG}" ]]; then
+      echo "Clobbering ${CONFIG} PCH files for xcode build"
+      rm -rf "${XCODEBUILD_DIR}/${CONFIG}"/SharedPrecompiledHeaders/*
+    fi
+  done
+fi
+
 if [ -z "$force_local_build" ]; then
   # Check if there's a prebuilt binary and if so just fetch that. That's faster,
   # and goma relies on having matching binary hashes on client and server too.