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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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