1dnl @synopsis AX_EMPTY_ARRAY 2dnl 3dnl Define EMPTY_ARRAY_SIZE to be either "0" 4dnl or "" depending on which syntax the compiler 5dnl prefers for empty arrays in structs. 6dnl 7dnl @version 8dnl @author James Yonan <jim@yonan.net> 9AC_DEFUN([AX_EMPTY_ARRAY], [ 10 AS_VAR_PUSHDEF([VAR],[ax_cv_c_empty_array])dnl 11 AC_CACHE_CHECK( 12 [for C compiler empty array size], 13 [VAR], 14 [AC_COMPILE_IFELSE( 15 [AC_LANG_PROGRAM( 16 , 17 [[ 18struct { int foo; int bar[0]; } mystruct; 19 ]] 20 )], 21 [VAR=0], 22 [AC_COMPILE_IFELSE( 23 [AC_LANG_PROGRAM( 24 , 25 [[ 26struct { int foo; int bar[]; } mystruct; 27 ]] 28 )], 29 [VAR=], 30 [AC_MSG_ERROR([C compiler is unable to creaty empty arrays])] 31 )] 32 )] 33 )dnl 34 AC_DEFINE_UNQUOTED( 35 [EMPTY_ARRAY_SIZE], 36 [$VAR], 37 [Dimension to use for empty array declaration] 38 )dnl 39 AS_VAR_POPDEF([VAR])dnl 40]) 41