buildroot

configure.ac: cross-compilation fix

​

This patch enables to configure the package when cross-compiling in a way

recommended by Autoconf manual (see manual for version 2.69, Section 6.6

Checking Runtime Behavior).

​

Signed-off-by: Alexander Lukichev <alexander.lukichev@gmail.com>

​

--- a/openpgm/pgm/configure.ac  2011-09-27 20:59:08.000000000 +0300

+++ b/openpgm/pgm/configure.ac  2013-02-12 10:33:53.000000000 +0200

@@ -272,14 +272,19 @@ uint32_t add32_with_carry (uint32_t a, u

    ;;

 esac

 # ticket spinlock friendly: unaligned pointers & atomic ops (excl. Sun Pro)

-AC_MSG_CHECKING([for unaligned pointers])

-AC_RUN_IFELSE(

-   [AC_LANG_PROGRAM([[char* nezumi = "mouse";]],

-       [[short x = *(short*)(nezumi + 2)]])],

-   [AC_MSG_RESULT([yes])

-       pgm_unaligned_pointers=yes],

-   [AC_MSG_RESULT([no])

-       pgm_unaligned_pointers=no])

+AC_CACHE_CHECK([if unaligned access fails], [ac_cv_lbl_unaligned_fail],

+   [AC_RUN_IFELSE(

+       [AC_LANG_PROGRAM([[char* nezumi = "mouse";]],

+           [[short x = *(short*)(nezumi + 2)]])],

+       [ac_cv_lbl_unaligned_fail=no],

+       [ac_cv_lbl_unaligned_fail=yes],

+       [ac_cv_lbl_unaligned_fail=yes])

+   ])

+if test "$ac_cv_lbl_unaligned_fail" = yes; then

+   pgm_unaligned_pointers=no

+else

+   pgm_unaligned_pointers=yes

+fi

 AC_MSG_CHECKING([for intrinsic atomic ops])

 # AC_PREPROC_IFELSE not always portable

 AC_COMPILE_IFELSE(