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