source: trunk/ORBit2-2.14.0/acinclude.m4@ 202

#######################
# type alignment test #
#######################

AC_DEFUN([AC_CHECK_ALIGNOF],
        [changequote(<<, >>)dnl
        dnl The name to #define.
        define(<<AC_TYPE_NAME>>,
                translit(orbit_alignof_$1, [a-z *], [A-Z_P]))dnl
        dnl The cache variable name.
        define(<<AC_CV_NAME>>,
                translit(ac_cv_alignof_$1, [ *], [_p]))dnl
        changequote([, ])dnl
        AC_MSG_CHECKING(alignment of $1)
        align_save_libs="$LIBS"
        LIBS="$ORBIT_LIBS $LIBS"
        AC_CACHE_VAL(AC_CV_NAME,
                [AC_TRY_RUN(
                        [ #include <stdio.h>
                          #include <stdlib.h>

                        #include "$srcdir/include/orbit/util/basic_types.h"
                        typedef struct {char s1;} CORBA_struct;
                        typedef void *CORBA_pointer;
                        struct test {char s1; $1 s2;};
                        main()
                        {
                        FILE *f=fopen("conftestval", "w");
                        if (!f) exit(1);
                        fprintf(f, "%d\n", &(((struct test*)0)->s2));
                        exit(0);
                        } ],
                        AC_CV_NAME=`cat conftestval`,
                        AC_CV_NAME=0, AC_CV_NAME=0)
                ])dnl
        AC_MSG_RESULT($AC_CV_NAME)
        if test "$AC_CV_NAME" = "0" ; then
                AC_MSG_ERROR([Failed to find alignment. Check config.log for details.])
        fi
        LIBS="$align_save_libs"
        AC_TYPE_NAME=$AC_CV_NAME
        AC_SUBST(AC_TYPE_NAME)
        undefine([AC_TYPE_NAME])dnl
        undefine([AC_CV_NAME])dnl
])