Initial import of the plugin-based protobuf compiler.

This is essentially the existing protobuf-objc code remixed as a protoc plugin
(for protobuf 2.3.0). A few things have been renamed or otherwise reorganized,
but the functionality should be identical at this point.

Author: Jon Parise

.gitignore

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+.deps
+.DS_Store
+Makefile
+Makefile.in
+aclocal.m4
+config.h
+config.h.in
+config.guess
+config.log
+config.status
+config.sub
+configure
+depcomp
+install-sh
+libtool
+ltmain.sh
+missing
+m4
+stamp-h1

CREDITS

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+Booyah Inc.
+-------------------------------------------------------------------------------
+Jon Parise <[email protected]>
+
+
+Google Protocol Buffers, Objective C
+-------------------------------------------------------------------------------
+Cyrus Najmabadi  (http://code.google.com/p/metasyntactic/wiki/ProtocolBuffers)
+Sergey Martynov  (http://github.com/martynovs/protobuf-objc)
+
+
+Google Protocol Buffers
+-------------------------------------------------------------------------------
+Kenton Varda, Sanjay Ghemawat, Jeff Dean, and others

Makefile.am

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+# Process this file with automake to produce Makefile.am
+
+ACLOCAL_AMFLAGS = -I m4
+AUTOMAKE_OPTIONS = foreign
+SUBDIRS = src/compiler
+
+EXTRA_DIST = 				\
+	autogen.sh
+
+# Clean up all of the files generated by autogen.sh
+MAINTAINERCLEANFILES =		\
+	aclocal.m4				\
+	config.guess			\
+	config.sub				\
+	configure				\
+	depcomp					\
+	install-sh				\
+	ltmain.sh				\
+	Makefile.in				\
+	missing					\
+	mkinstalldirs			\
+	config.h.in				\
+	stamp.h.in

autogen.sh

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+#!/bin/sh
+#
+# This script regenerates the authconf-based configure script.  The resulting
+# files aren't managed by source control but are included in the distribution.
+
+set -e
+autoreconf -f -i -Wall
+rm -rf autom4te.cache configure.ac~ config.h.in~
+exit 0

configure.ac

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+AC_PREREQ(2.61)
+
+AC_INIT([protobuf-plugin-objc],[0.1],[[email protected]],[protobuf-plugin-objc])
+
+AC_CONFIG_SRCDIR(src/compiler/main.cc)
+AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_MACRO_DIR([m4])
+
+AC_CANONICAL_TARGET
+AM_INIT_AUTOMAKE
+
+# Check for programs
+AC_PROG_CC
+AC_PROG_CXX
+AC_LANG([C++])
+
+AC_MSG_CHECKING([C++ compiler flags...])
+AS_IF([test "x${ac_cv_env_CXXFLAGS_set}" = "x"],[
+  # Disable debugging checks by default.
+  CXXFLAGS="$CXXFLAGS -DNDEBUG"
+  AC_MSG_RESULT([use default: $CXXFLAGS])
+],[
+  AC_MSG_RESULT([use user-supplied: $CXXFLAGS])
+])
+
+LT_INIT
+
+# Check for header files
+AC_HEADER_STDC
+AC_CHECK_HEADERS([fcntl.h inttypes.h limits.h stdlib.h unistd.h])
+
+# Check for libaries
+AC_FUNC_MEMCMP
+AC_FUNC_STRTOD
+AC_CHECK_FUNCS([ftruncate memset mkdir strchr strerror strtol])
+
+# Locate the protobuf library.
+AC_CHECK_HEADER(google/protobuf/stubs/common.h,,
+                [AC_MSG_ERROR([
+ERROR: protobuf headers are required.
+
+You must either install protobuf from google,
+or if you have it installed in a custom location
+you must add '-Iincludedir' to CXXFLAGS
+and '-Llibdir' to LDFLAGS.
+
+If you did not specify a prefix when installing
+protobuf, try 
+  './configure CXXFLAGS=-I/usr/local/include LDFLAGS=-L/usr/local/lib'
+In some 64-bit environments, try LDFLAGS=-L/usr/local/lib64.
+])])
+pbc_savelibs="$LIBS"
+LIBS="$LIBS -lprotoc -lprotobuf -lpthread"
+AC_LINK_IFELSE(
+  [AC_LANG_PROGRAM([[#include <google/protobuf/compiler/command_line_interface.h>]],
+                   [[google::protobuf::compiler::CommandLineInterface cli;]])],
+                   [],
+                   [AC_MSG_ERROR([
+ERROR:
+protobuf test program failed to link:
+perhaps you need to add -Llibdir to your LDFLAGS.])])
+LIBS="$pbc_savelibs"
+
+AC_CONFIG_FILES([Makefile src/compiler/Makefile])
+AC_OUTPUT

src/compiler/Makefile.am

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+MAINTAINERCLEANFILES = \
+	Makefile.in
+
+bin_PROGRAMS = protoc-gen-objc
+protoc_gen_objc_LDFLAGS = -pthreads -lprotobuf -lprotoc
+protoc_gen_objc_SOURCES = 	\
+	main.cc					\
+	objc_enum_field.cc		\
+	objc_file.cc			\
+	objc_message_field.cc	\
+	objc_enum.cc			\
+	objc_generator.cc		\
+	objc_primitive_field.cc	\
+	objc_extension.cc		\
+	objc_helpers.cc			\
+	objc_field.cc			\
+	objc_message.cc			\
+	google/protobuf/objectivec-descriptor.pb.cc