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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_printf_size_t.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PRINTF_SIZE_T
#
# DESCRIPTION
#
# Check for the appropriate printf() format string modifier to use with a
# size_t argument. If a suitable modifier is found, it is AC_DEFINE'd as
# PRI_SIZE_T_MODIFIER, and can be used in C code as e.g.
#
# printf("Size = %" PRI_SIZE_T_MODIFIER "u bytes.\n", sizeof(foo));
#
# If you use the PRIxNN macros from ISO C99's <inttypes.h>, you may wish
# to define a supplemental set of macros along similar lines:
#
# #define PRIdSIZE PRI_SIZE_T_MODIFIER "d"
# #define PRIiSIZE PRI_SIZE_T_MODIFIER "i"
# #define PRIoSIZE PRI_SIZE_T_MODIFIER "o"
# #define PRIuSIZE PRI_SIZE_T_MODIFIER "u"
# #define PRIxSIZE PRI_SIZE_T_MODIFIER "x"
# #define PRIXSIZE PRI_SIZE_T_MODIFIER "X"
#
# Note: This macro invokes a test program to check whether a given format
# modifier is understood by the system's sprintf() function. If the user
# is cross-compiling, then this check cannot be performed, and thereby
# PRI_SIZE_T_MODIFIER will remain undefined.
#
# LICENSE
#
# Copyright (c) 2012 Daniel Richard G. <skunk@iSKUNK.ORG>
#
# 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 2
AC_DEFUN([AX_PRINTF_SIZE_T], [
AC_MSG_CHECKING([for printf() modifier to use with size_t])
AC_LANG_PUSH([C])
save_CFLAGS="$CFLAGS"
if test "_$GCC" = _yes
then
# Take advantage of GCC's format-string checking
CFLAGS="$CFLAGS -Wformat -pedantic -Werror"
fi
result=unknown
for mod in z l "" ll
do
AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
int main(void)
{
char buf[64];
sprintf(buf, "%]${mod}[u", sizeof(buf));
if (buf[0] == '6' && buf[1] == '4' && buf[2] == '\0')
return 0;
return 1;
}]])],
[result="\"$mod\""; break],
[],
[result=cross-compile; break])
done
CFLAGS="$save_CFLAGS"
AC_LANG_POP
AC_MSG_RESULT([$result])
case "$result" in
cross-compile)
AC_MSG_WARN([cannot test printf() compatibility when cross-compiling])
;;
unknown)
AC_MSG_ERROR([cannot find a suitable modifier])
;;
*)
AC_DEFINE_UNQUOTED([PRI_SIZE_T_MODIFIER], [$result], [Define to the printf() modifier to use with size_t.])
;;
esac
])dnl AX_PRINTF_SIZE_T
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