@node ax_printf_size_t
@unnumberedsec ax_printf_size_t

@majorheading Synopsis

@smallexample
AX_PRINTF_SIZE_T
@end smallexample

@majorheading 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.

@smallexample
  printf("Size = %" PRI_SIZE_T_MODIFIER "u bytes.\n", sizeof(foo));
@end smallexample

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:

@smallexample
  #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"
@end smallexample

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.

@majorheading Source Code

Download the
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_printf_size_t.m4,latest
version of @file{ax_printf_size_t.m4}} or browse
@uref{http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_printf_size_t.m4,the
macro's revision history}.

@majorheading License

@w{Copyright @copyright{} 2012 Daniel Richard G. @email{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.