Add top level build script for building packages.

ports/gdb/build.sh

 #!/bin/bash
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source pkg_info
-source ../../build_tools/common.sh
 
 BuildStep() {
   Banner "Building ${PACKAGE_NAME}"
   make all
 }
 
 InstallStep() {
   Banner "Installing ${PACKAGE_NAME}"
   make install
 
@@ skipping 26 matching lines @@
   export CFLAGS=${NACLPORTS_CFLAGS}
   export CXXFLAGS=${NACLPORTS_CXXFLAGS}
   export LDFLAGS=${NACLPORTS_LDFLAGS}
   export AR=${NACLAR}
   export RANLIB=${NACLRANLIB}
   export PKG_CONFIG_PATH=${NACLPORTS_LIBDIR}/pkgconfig
   export PKG_CONFIG_LIBDIR=${NACLPORTS_LIBDIR}
   export PATH=${NACL_BIN_PATH}:${PATH};
   export NACLPORTS_INCLUDE
 
-  local SRC_DIR=${NACL_PACKAGES_REPOSITORY}/${PACKAGE_DIR}
-  local DEFAULT_BUILD_DIR=${SRC_DIR}/${NACL_BUILD_SUBDIR}
-  local BUILD_DIR=${NACL_BUILD_DIR:-${DEFAULT_BUILD_DIR}}
   MakeDir ${BUILD_DIR}
   ChangeDir ${BUILD_DIR}
   echo "Directory: $(pwd)"
 
   cp ${START_DIR}/gdb_pepper.cc ${SRC_DIR}/gdb
   ../configure --with-curses --with-expat --with-system-readline \
       --disable-libmcheck \
       --prefix=${NACLPORTS_PREFIX} \
       --exec-prefix=${NACLPORTS_PREFIX} \
       --host=${NACL_CROSS_PREFIX} \
       --libdir=${NACLPORTS_LIBDIR}
 
   # If the .info files don't exist, "make all" will try to recreate it with the
   # "makeinfo" tool, which isn't normally installed.
   # Just copy the ones from the repo to the build directory.
   mkdir -p ${BUILD_DIR}/{gdb,bfd}/doc
   pushd ${SRC_DIR}
   find gdb bfd -name '*.info' -exec cp {} ${BUILD_DIR}/{} \;
   popd
 }
-
-PackageInstall
-exit 0