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- dnl @synopsis AX_EMPTY_ARRAY
- dnl
- dnl Define EMPTY_ARRAY_SIZE to be either "0"
- dnl or "" depending on which syntax the compiler
- dnl prefers for empty arrays in structs.
- dnl
- dnl @version
- dnl @author James Yonan <jim@yonan.net>
- AC_DEFUN([AX_EMPTY_ARRAY], [
- AS_VAR_PUSHDEF([VAR],[ax_cv_c_empty_array])dnl
- AC_CACHE_CHECK(
- [for C compiler empty array size],
- [VAR],
- [AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- ,
- [[
- struct { int foo; int bar[0]; } mystruct;
- ]]
- )],
- [VAR=0],
- [AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- ,
- [[
- struct { int foo; int bar[]; } mystruct;
- ]]
- )],
- [VAR=],
- [AC_MSG_ERROR([C compiler is unable to creaty empty arrays])]
- )]
- )]
- )dnl
- AC_DEFINE_UNQUOTED(
- [EMPTY_ARRAY_SIZE],
- [$VAR],
- [Dimension to use for empty array declaration]
- )dnl
- AS_VAR_POPDEF([VAR])dnl
- ])
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