diff -r 8a72662f0815 -r 1c68438f44f7 scripts/build/companion_libs/100-gmp.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/build/companion_libs/100-gmp.sh	Fri Nov 16 14:59:27 2012 +0100
@@ -0,0 +1,103 @@
+# This file adds the functions to build the GMP library
+# Copyright 2008 Yann E. MORIN
+# Licensed under the GPL v2. See COPYING in the root of this package
+
+do_gmp_get() { :; }
+do_gmp_extract() { :; }
+do_gmp_for_build() { :; }
+do_gmp_for_host() { :; }
+
+# Overide functions depending on configuration
+if [ "${CT_GMP}" = "y" ]; then
+
+# Download GMP
+do_gmp_get() {
+    CT_GetFile "gmp-${CT_GMP_VERSION}" {ftp,http}://{ftp.sunet.se/pub,ftp.gnu.org}/gnu/gmp
+}
+
+# Extract GMP
+do_gmp_extract() {
+    CT_Extract "gmp-${CT_GMP_VERSION}"
+    CT_Patch "gmp" "${CT_GMP_VERSION}"
+}
+
+# Build GMP for running on build
+# - always build statically
+# - we do not have build-specific CFLAGS
+# - install in build-tools prefix
+do_gmp_for_build() {
+    local -a gmp_opts
+
+    case "${CT_TOOLCHAIN_TYPE}" in
+        native|cross)   return 0;;
+    esac
+
+    CT_DoStep INFO "Installing GMP for build"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-gmp-build-${CT_BUILD}"
+
+    gmp_opts+=( "host=${CT_BUILD}" )
+    gmp_opts+=( "prefix=${CT_BUILDTOOLS_PREFIX_DIR}" )
+    do_gmp_backend "${gmp_opts[@]}"
+
+    CT_Popd
+    CT_EndStep
+}
+
+# Build GMP for running on host
+do_gmp_for_host() {
+    local -a gmp_opts
+
+    CT_DoStep INFO "Installing GMP for host"
+    CT_mkdir_pushd "${CT_BUILD_DIR}/build-gmp-host-${CT_HOST}"
+
+    gmp_opts+=( "host=${CT_HOST}" )
+    gmp_opts+=( "prefix=${CT_HOST_COMPLIBS_DIR}" )
+    gmp_opts+=( "cflags=${CT_CFLAGS_FOR_HOST}" )
+    do_gmp_backend "${gmp_opts[@]}"
+
+    CT_Popd
+    CT_EndStep
+}
+
+# Build GMP
+#     Parameter     : description               : type      : default
+#     host          : machine to run on         : tuple     : (none)
+#     prefix        : prefix to install into    : dir       : (none)
+#     cflags        : host cflags to use        : string    : (empty)
+do_gmp_backend() {
+    local host
+    local prefix
+    local cflags
+    local arg
+
+    for arg in "$@"; do
+        eval "${arg// /\\ }"
+    done
+
+    CT_DoLog EXTRA "Configuring GMP"
+
+    CT_DoExecLog CFG                                \
+    CFLAGS="${cflags} -fexceptions"                 \
+    "${CT_SRC_DIR}/gmp-${CT_GMP_VERSION}/configure" \
+        --build=${CT_BUILD}                         \
+        --host=${host}                              \
+        --prefix="${prefix}"                        \
+        --enable-fft                                \
+        --enable-mpbsd                              \
+        --enable-cxx                                \
+        --disable-shared                            \
+        --enable-static
+
+    CT_DoLog EXTRA "Building GMP"
+    CT_DoExecLog ALL make ${JOBSFLAGS}
+
+    if [ "${CT_COMPLIBS_CHECK}" = "y" ]; then
+        CT_DoLog EXTRA "Checking GMP"
+        CT_DoExecLog ALL make ${JOBSFLAGS} -s check
+    fi
+
+    CT_DoLog EXTRA "Installing GMP"
+    CT_DoExecLog ALL make install
+}
+
+fi # CT_GMP