mac: Clobber pch files after clang updates.

tools/clang/scripts/update.sh

 #!/bin/bash
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script will check out llvm and clang into third_party/llvm and build it.
 
 THIS_DIR="$(dirname "${0}")"
 LLVM_DIR="${THIS_DIR}/../../../third_party/llvm"
 LLVM_BUILD_DIR="${LLVM_DIR}/../llvm-build"
@@ skipping 42 matching lines @@
   PREVIOUSLY_BUILT_REVISON=$(cat "${STAMP_FILE}")
   if [ -z "$force_local_build" -a \
        "${PREVIOUSLY_BUILT_REVISON}" = "${CLANG_REVISION}" ]; then
     echo "Clang already at ${CLANG_REVISION}"
     exit 0
   fi
 fi
 # To always force a new build if someone interrupts their build half way.
 rm -f "${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.
   CDS_URL=http://commondatastorage.googleapis.com/chromium-browser-clang
   CDS_FILE="clang-${CLANG_REVISION}.tgz"
   echo Trying to download prebuilt clang
   if [ "$(uname -s)" = "Linux" ]; then
     wget "${CDS_URL}/Linux_x64/${CDS_FILE}" || rm -f "${CDS_FILE}"
   elif [ "$(uname -s)" = "Darwin" ]; then
     curl -L --fail -O "${CDS_URL}/Mac/${CDS_FILE}" || rm -f "${CDS_FILE}"
@@ skipping 63 matching lines @@
 PLUGIN_BUILD_DIR="${LLVM_BUILD_DIR}/tools/clang/tools/chrome-plugin"
 rm -rf "${PLUGIN_DST_DIR}"
 cp -R "${PLUGIN_SRC_DIR}" "${PLUGIN_DST_DIR}"
 rm -rf "${PLUGIN_BUILD_DIR}"
 mkdir -p "${PLUGIN_BUILD_DIR}"
 cp "${PLUGIN_SRC_DIR}/Makefile" "${PLUGIN_BUILD_DIR}"
 make -j"${NUM_JOBS}" -C "${PLUGIN_BUILD_DIR}"
 
 # After everything is done, log success for this revision.
 echo "${CLANG_REVISION}" > "${STAMP_FILE}"