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ax_define_integer_bits.m4
# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_define_integer_bits.html # =========================================================================== # # SYNOPSIS # # AX_DEFINE_INTEGER_BITS (TYPE [, CANDIDATE-TYPE]...) # # DESCRIPTION # # Given a TYPE of the form "int##_t" or "uint##_t", see if the datatype # TYPE is predefined. If not, then define TYPE -- both with AC_DEFINE and # as a shell variable -- to the first datatype of exactly ## bits in a # list of CANDIDATE-TYPEs. If none of the CANDIDATE-TYPEs contains exactly # ## bits, then set the TYPE shell variable to "no". # # For example, the following ensures that uint64_t is defined as a 64-bit # datatype: # # AX_DEFINE_INTEGER_BITS(uint64_t, unsigned long long, unsigned __int64, long) # if test "$uint64_t" = no; then # AC_MSG_ERROR([unable to continue without a 64-bit datatype]) # fi # # You should then put the following in your C code to ensure that all # datatypes defined by AX_DEFINE_INTEGER_BITS are visible to your program: # # #include "config.h" # # #if HAVE_INTTYPES_H # # include <inttypes.h> # #else # # if HAVE_STDINT_H # # include <stdint.h> # # endif # #endif # # LICENSE # # Copyright (c) 2008 Scott Pakin <pakin@uiuc.edu> # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty. #serial 7 AU_ALIAS([AC_DEFINE_INTEGER_BITS], [AX_DEFINE_INTEGER_BITS]) AC_DEFUN([AX_DEFINE_INTEGER_BITS], [m4_define([ac_datatype_bits], [m4_translit($1, [a-zA-Z_])]) m4_define([ac_datatype_bytes], [m4_eval(ac_datatype_bits/8)]) AC_CHECK_TYPE($1, , [ AC_MSG_NOTICE([trying to find a suitable ]ac_datatype_bytes[-byte replacement for $1]) $1=no find_$1 () { _AX_DEFINE_INTEGER_BITS_HELPER($@) : } find_$1 AC_DEFINE_UNQUOTED($1, $$1, [If not already defined, then define as a datatype of *exactly* ]ac_datatype_bits[ bits.]) ]) ]) dnl Iterate over arguments $2..$N, trying to find a good match for $1. m4_define([_AX_DEFINE_INTEGER_BITS_HELPER], [ifelse($2, , , [m4_define([ac_datatype_bits], [m4_translit($1, [a-zA-Z_])]) m4_define([ac_datatype_bytes], [m4_eval(ac_datatype_bits/8)]) AC_CHECK_SIZEOF($2) if test "$AS_TR_SH(ac_cv_sizeof_$2)" -eq ac_datatype_bytes; then $1="$2" return fi _AX_DEFINE_INTEGER_BITS_HELPER($1, m4_shift(m4_shift($@))) ]) ])