configure.ac: cross-compilation fix
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This patch enables to configure the package when cross-compiling in a way
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recommended by Autoconf manual (see manual for version 2.69, Section 6.6
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Checking Runtime Behavior).
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Signed-off-by: Alexander Lukichev <alexander.lukichev@gmail.com>
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--- a/openpgm/pgm/configure.ac 2011-09-27 20:59:08.000000000 +0300
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+++ b/openpgm/pgm/configure.ac 2013-02-12 10:33:53.000000000 +0200
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@@ -272,14 +272,19 @@ uint32_t add32_with_carry (uint32_t a, u
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;;
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esac
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# ticket spinlock friendly: unaligned pointers & atomic ops (excl. Sun Pro)
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-AC_MSG_CHECKING([for unaligned pointers])
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-AC_RUN_IFELSE(
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- [AC_LANG_PROGRAM([[char* nezumi = "mouse";]],
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- [[short x = *(short*)(nezumi + 2)]])],
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- [AC_MSG_RESULT([yes])
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- pgm_unaligned_pointers=yes],
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- [AC_MSG_RESULT([no])
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- pgm_unaligned_pointers=no])
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+AC_CACHE_CHECK([if unaligned access fails], [ac_cv_lbl_unaligned_fail],
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+ [AC_RUN_IFELSE(
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+ [AC_LANG_PROGRAM([[char* nezumi = "mouse";]],
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+ [[short x = *(short*)(nezumi + 2)]])],
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+ [ac_cv_lbl_unaligned_fail=no],
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+ [ac_cv_lbl_unaligned_fail=yes],
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+ [ac_cv_lbl_unaligned_fail=yes])
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+ ])
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+if test "$ac_cv_lbl_unaligned_fail" = yes; then
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+ pgm_unaligned_pointers=no
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+else
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+ pgm_unaligned_pointers=yes
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+fi
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AC_MSG_CHECKING([for intrinsic atomic ops])
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# AC_PREPROC_IFELSE not always portable
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AC_COMPILE_IFELSE(
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