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>

 2011-02-28  Aurelien Jarno  <aurelien@aurel32.net>

 	* sysdeps/alpha/stackinfo.h: Define DEFAULT_STACK_PERMS with PF_X.

 diff --git glibc-2.13/glibc-ports-2.13/sysdeps/alpha/stackinfo.h glibc-2.13/glibc-ports-2.13/sysdeps/alpha/stackinfo.h

 index 0a281bd..d9dbc35 100644

 --- glibc-2.13/glibc-ports-2.13/sysdeps/alpha/stackinfo.h

 +++ glibc-2.13/glibc-ports-2.13/sysdeps/alpha/stackinfo.h

 @@ -22,7 +22,13 @@

  #ifndef _STACKINFO_H

  #define _STACKINFO_H	1

 +#include <elf.h>

 +

  /* On Alpha the stack grows down.  */

  #define _STACK_GROWS_DOWN	1

 +/* Default to an executable stack.  PF_X can be overridden if PT_GNU_STACK is

 + * present, but it is presumed absent.  */

 +#define DEFAULT_STACK_PERMS (PF_R|PF_W|PF_X)

 +

  #endif	/* stackinfo.h */