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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(
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