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      1  1.1  christos #serial 4
      2  1.1  christos 
      3  1.1  christos dnl From Paul Eggert.
      4  1.1  christos 
      5  1.1  christos AC_DEFUN([AC_C_BACKSLASH_A],
      6  1.1  christos [
      7  1.1  christos   AC_CACHE_CHECK([whether backslash-a works in strings], ac_cv_c_backslash_a,
      8  1.1  christos    [AC_TRY_COMPILE([],
      9  1.1  christos      [
     10  1.1  christos #if '\a' == 'a'
     11  1.1  christos       syntax error;
     12  1.1  christos #endif
     13  1.1  christos       char buf['\a' == 'a' ? -1 : 1];
     14  1.1  christos       buf[0] = '\a';
     15  1.1  christos       return buf[0] != "\a"[0];
     16  1.1  christos      ],
     17  1.1  christos      ac_cv_c_backslash_a=yes,
     18  1.1  christos      ac_cv_c_backslash_a=no)])
     19  1.1  christos   if test $ac_cv_c_backslash_a = yes; then
     20  1.1  christos     AC_DEFINE(HAVE_C_BACKSLASH_A, 1,
     21  1.1  christos       [Define if backslash-a works in C strings.])
     22  1.1  christos   fi
     23  1.1  christos ])
     24