#serial 1 dnl From Paul Eggert. AC_DEFUN(AC_C_BACKSLASH_A, [ AC_CACHE_CHECK([whether backslash-a works in strings], ac_cv_c_backslash_a, [AC_TRY_COMPILE([], [ changequote(, ) dnl #if '\a' == 'a' syntax error; #endif char buf['\a' == 'a' ? -1 : 1]; buf[0] = '\a'; return buf[0] != "\a"[0]; changequote([, ])dnl ], ac_cv_c_backslash_a=yes, ac_cv_c_backslash_a=no)]) if test $ac_cv_c_backslash_a = yes; then AC_DEFINE(HAVE_C_BACKSLASH_A, 1, [Define if backslash-a works in C strings.]) fi ])