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the "ISO C9X: 7.18 Integer types <stdint.h>" section requires the existence of an include file <stdint.h> that defines a set of typedefs, especially uint8_t,int32_t,uintptr_t. Many older installations will not provide this file, but some will have the very same definitions in <inttypes.h>. In other environments we can use the inet-types in <sys/types.h> which would define the typedefs int8_t and u_int8_t respectively.

This macros will create a local "_stdint.h" or the headerfile given as an argument. In many cases that file will just "#include <stdint.h>" or "#include <inttypes.h>", while in other environments it will provide the set of basic ’stdint’s definitions/typedefs:

  int_least32_t.. int_fast32_t.. intmax_t

which may or may not rely on the definitions of other files, or using the AC_CHECK_SIZEOF macro to determine the actual sizeof each type.

if your header files require the stdint-types you will want to create an installable file mylib-int.h that all your other installable header may include. So if you have a library package named "mylib", just use


in and go to install that very header file in along with the other headers (mylib.h) - and the mylib-specific headers can simply use "#include <mylib-int.h>" to obtain the stdint-types.

Remember, if the system already had a valid <stdint.h>, the generated file will include it directly. No need for fuzzy HAVE_STDINT_H things... (oops, GCC 4.2.x has deliberately disabled its stdint.h for non-c99 compilation and the c99-mode is not the default. Therefore this macro will not use the compiler’s stdint.h - please complain to the GCC developers).

Source Code

Download the latest version of ax_create_stdint_h.m4 or browse the macro’s revision history.


Copyright © 2008 Guido U. Draheim

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