alexhudson
33 lines
956 B
Plaintext
33 lines
956 B
Plaintext
dnl AC_DEFINE_INTEGER_BITS
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AC_DEFUN([AC_DEFINE_INTEGER_BITS],
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[m4_define([ac_datatype_bits], [m4_translit($1, [a-zA-Z_])])
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m4_define([ac_datatype_bytes], [m4_eval(ac_datatype_bits/8)])
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AC_CHECK_TYPE($1, ,
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[
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AC_MSG_NOTICE([trying to find a suitable ]ac_datatype_bytes[-byte replacement for $1])
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$1=no
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find_$1 ()
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{
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_AC_DEFINE_INTEGER_BITS_HELPER($@)
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:
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}
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find_$1
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AC_DEFINE_UNQUOTED($1, $$1,
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[If not already defined, then define as a datatype of *exactly* ]ac_datatype_bits[ bits.])
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])
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])
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dnl Iterate over arguments $2..$N, trying to find a good match for $1.
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m4_define([_AC_DEFINE_INTEGER_BITS_HELPER],
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[ifelse($2, , ,
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[m4_define([ac_datatype_bits], [m4_translit($1, [a-zA-Z_])])
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m4_define([ac_datatype_bytes], [m4_eval(ac_datatype_bits/8)])
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AC_CHECK_SIZEOF($2)
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if test "$AS_TR_SH(ac_cv_sizeof_$2)" -eq ac_datatype_bytes; then
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$1="$2"
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return
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fi
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_AC_DEFINE_INTEGER_BITS_HELPER($1, m4_shift(m4_shift($@)))
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])
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])
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