complibs/cloog: fix linking with libm

In Ubuntu 11.04 and 11.10, the default options for ld have changed.
--no-copy-dt-needed-entries and --as-needed are now enabled by default, which
causes errors like:

[EXTRA] Checking CLooG/ppl
[DEBUG] ==> Executing: 'make' '-j3' '-s' 'check'
[ALL ] Making check in .
[ALL ] config.status: creating include/cloog/cloog-config.h
[ALL ] config.status: include/cloog/cloog-config.h is unchanged
[ALL ] libtool: link: i686-build_pc-linux-gnu-gcc -Wall -fomit-frame-pointer
-pipe -o cloog cloog.o -L/<snip>/build/static/lib ./.libs/libcloog.a -lm
/<snip>/build/static/lib/libppl_c.a /<snip>/build/static/lib/libpwl.a
/<snip>/build/static/lib/libppl.a /<snip>/build/static/lib/libgmpxx.a
/<snip>/build/static/lib/libgmp.a -lstdc++
[ALL ] /usr/bin/ld: /<snip>/build/static/lib/libppl.a(MIP_Problem.o):
undefined reference to symbol 'sqrt@@GLIBC_2.0'
[ALL ] /usr/bin/ld: note: 'sqrt@@GLIBC_2.0' is defined in DSO
/usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libm.so so try adding
it to the linker command line
[ALL ] /usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libm.so:
could not read symbols: Invalid operation
[ALL ] collect2: ld returned 1 exit status
[ERROR] make[2]: *** [cloog] Error 1
[ERROR] make[1]: *** [check-recursive] Error 1

See:
https://wiki.ubuntu.com/NattyNarwhal/ToolchainTransition

This patch fixes these errors by placing '-lm' at the right place on the command
line as libppl requires libm when linking cloog.

Signed-off-by: "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>

# This file adds the functions to build the MPC library

# Copyright 2009 Yann E. MORIN

# Licensed under the GPL v2. See COPYING in the root of this package

do_mpc_get() { :; }

do_mpc_extract() { :; }

do_mpc() { :; }

# Overide functions depending on configuration

if [ "${CT_MPC}" = "y" ]; then

# Download MPC

do_mpc_get() {

    CT_GetFile "mpc-${CT_MPC_VERSION}" .tar.gz      \

        http://www.multiprecision.org/mpc/download

}

# Extract MPC

do_mpc_extract() {

    CT_Extract "mpc-${CT_MPC_VERSION}"

    CT_Patch "mpc" "${CT_MPC_VERSION}"

}

do_mpc() {

    mkdir -p "${CT_BUILD_DIR}/build-mpc"

    cd "${CT_BUILD_DIR}/build-mpc"

    CT_DoStep INFO "Installing MPC"

    CT_DoLog EXTRA "Configuring MPC"

    CT_DoExecLog CFG                                \

    CFLAGS="${CT_CFLAGS_FOR_HOST}"                  \

    "${CT_SRC_DIR}/mpc-${CT_MPC_VERSION}/configure" \

        --build=${CT_BUILD}                         \

        --host=${CT_HOST}                           \

        --prefix="${CT_COMPLIBS_DIR}"               \

        --with-gmp="${CT_COMPLIBS_DIR}"             \

        --with-mpfr="${CT_COMPLIBS_DIR}"            \

        --disable-shared                            \

        --enable-static

    CT_DoLog EXTRA "Building MPC"

    CT_DoExecLog ALL make ${JOBSFLAGS}

    if [ "${CT_COMPLIBS_CHECK}" = "y" ]; then

        CT_DoLog EXTRA "Checking MPC"

        CT_DoExecLog ALL make ${JOBSFLAGS} -s check

    fi

    CT_DoLog EXTRA "Installing MPC"

    CT_DoExecLog ALL make install

    CT_EndStep

}

fi # CT_MPC