Move xcrunwrapper and libtool to third_party/bazel/tools/objc from their xcode src directories

There's no value in having these copied over from src/tools to tools/objc separately.

RELNOTES: None.
PiperOrigin-RevId: 153060955

1 files changed, 106 insertions, 0 deletions

diff --git a/tools/objc/libtool.sh b/tools/objc/libtool.sh
new file mode 100755
index 0000000000..5ad89a019d
--- /dev/null
+++ b/tools/objc/libtool.sh
@@ -0,0 +1,106 @@
+#!/bin/bash
+#
+# Copyright 2016 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# libtool.sh runs the command passed to it using "xcrunwrapper libtool".
+#
+# It creates symbolic links for all input files with a path-hash appended
+# to their original name (foo.o becomes foo_{md5sum}.o). This is to circumvent
+# a bug in the original libtool that arises when two input files have the same
+# base name (even if they are in different directories).
+
+set -eu
+
+MY_LOCATION=${MY_LOCATION:-"$0.runfiles/bazel_tools/tools/objc"}
+WRAPPER="${MY_LOCATION}/xcrunwrapper.sh"
+
+# 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 -qs "${ORIGINAL_NAME}")"
+  SYMLINK_NAME="${ORIGINAL_NAME%.o}_${ORIGINAL_HASH}.o"
+  if [[ ! -e "$SYMLINK_NAME" ]]; then
+    ln -sf "$(basename "$ORIGINAL_NAME")" "$SYMLINK_NAME"
+  fi
+  echo "$SYMLINK_NAME"
+}
+
+ARGS=()
+
+while [[ $# -gt 0 ]]; do
+  ARG="$1"
+  shift
+
+  # Libtool artifact symlinking. Apple's libtool has a bug when there are two
+  # input files with the same basename. We thus create symlinks that are named
+  # with a hash suffix for each input, and pass them to libtool.
+  # See b/28186497.
+  case "${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"
+      rm -f "${HASHED_FILELIST}"
+      # Use python helper script for fast md5 calculation of many strings.
+      python "${MY_LOCATION}/make_hashed_objlist.py" "${ARG}" "${HASHED_FILELIST}"
+      ARGS+=("${HASHED_FILELIST}")
+      ;;
+   # Output flag
+    -o)
+     ARGS+=("${ARG}")
+     ARG="$1"
+     shift
+     ARGS+=("${ARG}")
+     OUTPUTFILE="${ARG}"
+     ;;
+   # Flags with no args
+    -static|-s|-a|-c|-L|-T|-no_warning_for_no_symbols)
+      ARGS+=("${ARG}")
+      ;;
+   # Single-arg flags
+   -arch_only|-syslibroot)
+     ARGS+=("${ARG}")
+     ARG="$1"
+     shift
+     ARGS+=("${ARG}")
+     ;;
+   # Any remaining flags are unexpected and may ruin flag parsing.
+   -*)
+     echo "Unrecognized libtool flag ${ARG}"
+     exit 1
+     ;;
+   # Archive inputs can remain untouched, as they come from other targets.
+   *.a)
+     ARGS+=("${ARG}")
+     ;;
+   # Remaining args are input objects
+   *)
+     ARGS+=("$(echo "$(hash_objfile "${ARG}")")")
+     ;;
+   esac
+done
+
+# Ensure 0 timestamping for hermetic results.
+export ZERO_AR_DATE=1
+
+"${WRAPPER}" libtool "${ARGS[@]}"
+
+# Prevents a pre-Xcode-8 bug in which passing zero-date archive files to ld
+# would cause ld to error.
+touch "$OUTPUTFILE"