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>

diff -durN gcc-4.4.0.orig/gcc/doc/invoke.texi gcc-4.4.0/gcc/doc/invoke.texi

--- gcc-4.4.0.orig/gcc/doc/invoke.texi	2009-05-27 21:38:11.000000000 +0200

+++ gcc-4.4.0/gcc/doc/invoke.texi	2009-05-27 21:38:11.000000000 +0200

@@ -5411,6 +5411,11 @@

 Please note the warning under @option{-fgcse} about

 invoking @option{-O2} on programs that use computed gotos.

+NOTE: In Gentoo, @option{-D_FORTIFY_SOURCE=2} is set by default, and is

+activated when @option{-O} is set to 2 or higher.  This enables additional

+compile-time and run-time checks for several libc functions.  To disable,

+specify either @option{-U_FORTIFY_SOURCE} or @option{-D_FORTIFY_SOURCE=0}.

+

 @item -O3

 @opindex O3

 Optimize yet more.  @option{-O3} turns on all optimizations specified

diff -durN gcc-4.4.0.orig/gcc/gcc.c gcc-4.4.0/gcc/gcc.c

--- gcc-4.4.0.orig/gcc/gcc.c	2009-03-17 22:25:59.000000000 +0100

+++ gcc-4.4.0/gcc/gcc.c	2009-05-27 21:38:11.000000000 +0200

@@ -807,6 +807,7 @@

  %{H} %C %{D*&U*&A*} %{i*} %Z %i\

  %{fmudflap:-D_MUDFLAP -include mf-runtime.h}\

  %{fmudflapth:-D_MUDFLAP -D_MUDFLAPTH -include mf-runtime.h}\

+ %{!D_FORTIFY_SOURCE:%{!D_FORTIFY_SOURCE=*:%{!U_FORTIFY_SOURCE:-D_FORTIFY_SOURCE=2}}}\

  %{E|M|MM:%W{o*}}";

 /* This contains cpp options which are common with cc1_options and are passed