diff -r 8a72662f0815 -r 1c68438f44f7 scripts/build/companion_libs/200-libelf.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/build/companion_libs/200-libelf.sh	Fri Nov 16 14:59:27 2012 +0100
@@ -0,0 +1,135 @@
+# Build script for libelf
+
+do_libelf_get() { :; }
+do_libelf_extract() { :; }
+do_libelf_for_build() { :; }
+do_libelf_for_host() { :; }
+do_libelf_for_target() { :; }
+
+if [ "${CT_LIBELF}" = "y" -o "${CT_LIBELF_TARGET}" = "y" ]; then
+
+do_libelf_get() {
+    # The server hosting libelf will return an "HTTP 300 : Multiple Choices"
+    # error code if we try to download a file that does not exists there.
+    # So we have to request the file with an explicit extension.
+    CT_GetFile "libelf-${CT_LIBELF_VERSION}" .tar.gz http://www.mr511.de/software/
+}
+
+do_libelf_extract() {
+    CT_Extract "libelf-${CT_LIBELF_VERSION}"
+    CT_Patch "libelf" "${CT_LIBELF_VERSION}"
+}
+
+if [ "${CT_LIBELF}" = "y" ]; then
+
+# Build libelf for running on build
+# - always build statically
+# - we do not have build-specific CFLAGS
+# - install in build-tools prefix
+do_libelf_for_build() {
+    local -a libelf_opts
+
+    case "${CT_TOOLCHAIN_TYPE}" in
+        native|cross)   return 0;;
+    esac
+
+    CT_DoStep INFO "Installing libelf for build"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-libelf-build-${CT_BUILD}"
+
+    libelf_opts+=( "host=${CT_BUILD}" )
+    libelf_opts+=( "prefix=${CT_BUILDTOOLS_PREFIX_DIR}" )
+    do_libelf_backend "${libelf_opts[@]}"
+
+    CT_Popd
+    CT_EndStep
+}
+
+# Build libelf for running on host
+do_libelf_for_host() {
+    local -a libelf_opts
+
+    CT_DoStep INFO "Installing libelf for host"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-libelf-host-${CT_HOST}"
+
+    libelf_opts+=( "host=${CT_HOST}" )
+    libelf_opts+=( "prefix=${CT_HOST_COMPLIBS_DIR}" )
+    libelf_opts+=( "cflags=${CT_CFLAGS_FOR_HOST}" )
+    do_libelf_backend "${libelf_opts[@]}"
+
+    CT_Popd
+    CT_EndStep
+}
+
+fi # CT_LIBELF
+
+if [ "${CT_LIBELF_TARGET}" = "y" ]; then
+
+do_libelf_for_target() {
+    local -a libelf_opts
+
+    CT_DoStep INFO "Installing libelf for the target"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-libelf-target-${CT_TARGET}"
+
+    libelf_opts+=( "destdir=${CT_SYSROOT_DIR}" )
+    libelf_opts+=( "host=${CT_TARGET}" )
+    libelf_opts+=( "prefix=/usr" )
+    libelf_opts+=( "shared=y" )
+    do_libelf_backend "${libelf_opts[@]}"
+
+    CT_Popd
+    CT_EndStep
+}
+
+fi # CT_LIBELF_TARGET
+
+# Build libelf
+#     Parameter     : description               : type      : default
+#     destdir       : out-of-tree install dir   : string    : /
+#     host          : machine to run on         : tuple     : (none)
+#     prefix        : prefix to install into    : dir       : (none)
+#     cflags        : host cflags to use        : string    : (empty)
+#     shared        : also buils shared lib     : bool      : n
+do_libelf_backend() {
+    local destdir="/"
+    local host
+    local prefix
+    local cflags
+    local shared
+    local -a extra_config
+    local arg
+
+    for arg in "$@"; do
+        eval "${arg// /\\ }"
+    done
+
+    CT_DoLog EXTRA "Configuring libelf"
+
+    if [ "${shared}" = "y" ]; then
+        extra_config+=( --enable-shared )
+    else
+        extra_config+=( --disable-shared )
+    fi
+
+    CT_DoExecLog CFG                                        \
+    CC="${host}-gcc"                                        \
+    RANLIB="${host}-ranlib"                                 \
+    CFLAGS="${cflags} -fPIC"                                \
+    "${CT_SRC_DIR}/libelf-${CT_LIBELF_VERSION}/configure"   \
+        --build=${CT_BUILD}                                 \
+        --host=${host}                                      \
+        --target=${CT_TARGET}                               \
+        --prefix="${prefix}"                                \
+        --enable-compat                                     \
+        --enable-elf64                                      \
+        --enable-extended-format                            \
+        --enable-static                                     \
+        "${extra_config[@]}"
+
+    CT_DoLog EXTRA "Building libelf"
+    CT_DoExecLog ALL make
+
+    CT_DoLog EXTRA "Installing libelf"
+    CT_DoExecLog ALL make instroot="${destdir}" install
+}
+
+fi # CT_LIBELF || CT_LIBELF_TARGET