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>

Original patch from: gentoo/src/patchsets/glibc/2.9/0050_all_glibc-_nss_dns_gethostbyaddr2_r-check-and-adjust-the-buffer-alignment.patch

-= BEGIN original header =-

http://sourceware.org/ml/libc-alpha/2009-01/msg00000.html

From 8ad7030880eaa18dcabf8e284e79026301fd3fa4 Mon Sep 17 00:00:00 2001

From: Ulrich Drepper <drepper@redhat.com>

Date: Thu, 8 Jan 2009 00:02:38 +0000

Subject: [PATCH] (_nss_dns_gethostbyaddr2_r): Check and adjust the buffer alignment.

-= END original header =-

diff -durN glibc-2_9.orig/resolv/nss_dns/dns-host.c glibc-2_9/resolv/nss_dns/dns-host.c

--- glibc-2_9.orig/resolv/nss_dns/dns-host.c	2008-11-12 08:52:20.000000000 +0100

+++ glibc-2_9/resolv/nss_dns/dns-host.c	2009-02-02 22:00:36.000000000 +0100

@@ -364,6 +364,19 @@

   int n, status;

   int olderr = errno;

+ uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct host_data);

+ buffer += pad;

+ buflen = buflen > pad ? buflen - pad : 0;

+

+ if (__builtin_expect (buflen < sizeof (struct host_data), 0))

+   {

+     *errnop = ERANGE;

+     *h_errnop = NETDB_INTERNAL;

+     return NSS_STATUS_TRYAGAIN;

+   }

+

+ host_data = (struct host_data *) buffer;

+

   if (__res_maybe_init (&_res, 0) == -1)

     return NSS_STATUS_UNAVAIL;