Squashed 'libs/protobuf/' content from commit fcd3b9a85

git-subtree-dir: libs/protobuf
git-subtree-split: fcd3b9a85ef36e46643dc30176cea1a7ad62e02b

objectivec/DevTools/check_version_stamps.sh

@@ -0,0 +1,55 @@
+#!/bin/bash -eu
+
+# This script checks that the runtime version number constant in the compiler
+# source and in the runtime source is the same.
+#
+# A distro can be made of the protobuf sources with only a subset of the
+# languages, so if the compiler depended on the Objective C runtime, those
+# builds would break. At the same time, we don't want the runtime source
+# depending on the compiler sources; so two copies of the constant are needed.
+
+readonly ScriptDir=$(dirname "$(echo $0 | sed -e "s,^\([^/]\),$(pwd)/\1,")")
+readonly ProtoRootDir="${ScriptDir}/../.."
+
+die() {
+    echo "Error: $1"
+    exit 1
+}
+
+readonly GeneratorSrc="${ProtoRootDir}/src/google/protobuf/compiler/objectivec/file.cc"
+readonly RuntimeSrc="${ProtoRootDir}/objectivec/GPBBootstrap.h"
+
+check_constant() {
+  local ConstantName="$1"
+
+  # Collect version from generator sources.
+  local GeneratorVersion=$( \
+      cat "${GeneratorSrc}" \
+          | sed -n -e "s:const int32_t ${ConstantName} = \([0-9]*\);:\1:p"
+  )
+  if [[ -z "${GeneratorVersion}" ]] ; then
+      die "Failed to find ${ConstantName} in the generator source (${GeneratorSrc})."
+  fi
+
+  # Collect version from runtime sources.
+  local RuntimeVersion=$( \
+      cat "${RuntimeSrc}" \
+          | sed -n -e "s:#define ${ConstantName} \([0-9]*\):\1:p"
+  )
+  if [[ -z "${RuntimeVersion}" ]] ; then
+      die "Failed to find ${ConstantName} in the runtime source (${RuntimeSrc})."
+  fi
+
+  # Compare them.
+  if [[ "${GeneratorVersion}" != "${RuntimeVersion}" ]] ; then
+      die "${ConstantName} values don't match!
+  Generator: ${GeneratorVersion} from ${GeneratorSrc}
+    Runtime: ${RuntimeVersion} from ${RuntimeSrc}
+"
+  fi
+}
+
+# Do the check.
+check_constant GOOGLE_PROTOBUF_OBJC_VERSION
+
+# Success