1#serial 4 2 3dnl From Paul Eggert. 4 5AC_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