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bdd80be1fe
Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com> Acked-by: David Sommerseth <davids@redhat.com> Signed-off-by: David Sommerseth <davids@redhat.com>
41 lines
837 B
Plaintext
41 lines
837 B
Plaintext
dnl @synopsis AX_EMPTY_ARRAY
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dnl
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dnl Define EMPTY_ARRAY_SIZE to be either "0"
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dnl or "" depending on which syntax the compiler
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dnl prefers for empty arrays in structs.
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dnl
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dnl @version
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dnl @author James Yonan <jim@yonan.net>
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AC_DEFUN([AX_EMPTY_ARRAY], [
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AS_VAR_PUSHDEF([VAR],[ax_cv_c_empty_array])dnl
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AC_CACHE_CHECK(
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[for C compiler empty array size],
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[VAR],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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,
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[[
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struct { int foo; int bar[0]; } mystruct;
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]]
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)],
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[VAR=0],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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,
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[[
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struct { int foo; int bar[]; } mystruct;
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]]
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)],
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[VAR=],
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[AC_MSG_ERROR([C compiler is unable to creaty empty arrays])]
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)]
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)]
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)dnl
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AC_DEFINE_UNQUOTED(
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[EMPTY_ARRAY_SIZE],
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[$VAR],
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[Dimension to use for empty array declaration]
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)dnl
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AS_VAR_POPDEF([VAR])dnl
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])
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