Rollforward of "Workaround for duplicate input basename bug in apple's libtool", with regex fix

--
MOS_MIGRATED_REVID=121390817

1 files changed, 71 insertions, 5 deletions

diff --git a/src/tools/xcode/xcrunwrapper/xcrunwrapper.sh b/src/tools/xcode/xcrunwrapper/xcrunwrapper.sh
index dfb36aa4ef..ae5772255c 100755
--- a/src/tools/xcode/xcrunwrapper/xcrunwrapper.sh
+++ b/src/tools/xcode/xcrunwrapper/xcrunwrapper.sh
@@ -14,14 +14,29 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-# xcrunwrapper runs the command passed to it using xcrun.
-# It replaces __BAZEL_XCODE_DEVELOPER_DIR__ with $DEVELOPER_DIR (or reasonable
-# default) and __BAZEL_XCODE_SDKROOT__ with a valid path based on SDKROOT (or
-# reasonable default).
+# xcrunwrapper runs the command passed to it using xcrun. The first arg
+# passed is the name of the tool to be invoked via xcrun. (For example, libtool
+# or clang).
+# xcrunwrapper replaces __BAZEL_XCODE_DEVELOPER_DIR__ with $DEVELOPER_DIR (or
+# reasonable default) and __BAZEL_XCODE_SDKROOT__ with a valid path based on
+# SDKROOT (or reasonable default).
 # These values (__BAZEL_XCODE_*) are a shared secret withIosSdkCommands.java.
 
 set -eu
 
+TOOLNAME=$1
+shift
+
+# Creates a symbolic link to the input argument file and returns the symlink
+# file path.
+function hash_objfile() {
+  ORIGINAL_NAME="$1"
+  ORIGINAL_HASH="$(/sbin/md5 -q "${ORIGINAL_NAME}")"
+  SYMLINK_NAME="${ORIGINAL_NAME%.o}_${ORIGINAL_HASH}.o"
+  ln -s "$(basename "$ORIGINAL_NAME")" "$SYMLINK_NAME"
+  echo "$SYMLINK_NAME"
+}
+
 # Pick values for DEVELOPER_DIR and SDKROOT as appropriate (if they weren't set)
 
 WRAPPER_DEVDIR="${DEVELOPER_DIR:-}"
@@ -47,8 +62,59 @@ if [[ -z "${WRAPPER_SDKROOT:-}" ]] ; then
   WRAPPER_SDKROOT="$(/usr/bin/xcrun --show-sdk-path --sdk ${WRAPPER_SDK})"
 fi
 
+ARGS=("$TOOLNAME")
+while [[ $# -gt 0 ]]; do
+  ARG="$1"
+  shift
+
+  # Libtool artifact symlinking. Apple's libtool has a bug when there are two
+  # input files with the same basename. We thus create symlinks that are named
+  # with a hash suffix for each input, and pass them to libtool.
+  # See b/28186497.
+  # TODO(b/28347228): Handle this in a separate wrapper.
+  if [ "$TOOLNAME" = "libtool" ] ; then
+    case "${ARG}" in
+      # Filelist flag, need to symlink each input in the contents of file and
+      # pass a new filelist which contains the symlinks.
+      -filelist)
+        ARGS+=("${ARG}")
+        ARG="$1"
+        shift
+        HASHED_FILELIST="${ARG//.objlist/_hashes.objlist}"
+        while read INPUT_FILE || [ -n "$INPUT_FILE" ]; do
+          echo "$(hash_objfile "${INPUT_FILE}")" >> "$HASHED_FILELIST"
+        done < "${ARG}"
+        ARGS+=("${HASHED_FILELIST}")
+        ;;
+     # Flags with no args
+      -static|-s|-a|-c|-L|-T|-no_warning_for_no_symbols)
+        ARGS+=("${ARG}")
+        ;;
+     # Single-arg flags
+     -o|-arch_only|-syslibroot)
+       ARGS+=("${ARG}")
+       ARG="$1"
+       shift
+       ARGS+=("${ARG}")
+       ;;
+     # Any remaining flags are unexpected and may ruin flag parsing.
+     -*)
+       echo "Unrecognized libtool flag ${ARG}"
+       exit 1
+       ;;
+     # Remaining args are input objects
+     *)
+       ARGS+=("$(echo "$(hash_objfile "${ARG}")")")
+       ;;
+     esac
+  else
+    ARGS+=("${ARG}")
+  fi
+done
+
+# Subsitute toolkit path placeholders.
 UPDATEDARGS=()
-for ARG in "$@" ; do
+for ARG in "${ARGS[@]}" ; do
   ARG="${ARG//__BAZEL_XCODE_DEVELOPER_DIR__/${WRAPPER_DEVDIR}}"
   ARG="${ARG//__BAZEL_XCODE_SDKROOT__/${WRAPPER_SDKROOT}}"
   UPDATEDARGS+=("${ARG}")