+ dnl Ensure that <stdint.h> defines the limit macros, since gnulib's
+ dnl <inttypes.h> relies on them. This macro is only needed when a
+ dnl C++ compiler is in use; it has no effect for a C compiler.
+ dnl Also be careful to define __STDC_LIMIT_MACROS only when gnulib's
+ dnl <inttypes.h> is going to be created, and to avoid redefinition warnings
+ dnl if the __STDC_LIMIT_MACROS is already defined through the CPPFLAGS.
+ AC_DEFINE([__STDC_LIMIT_MACROS_TRIGGER], 1,
+ [Define to make the limit macros in <stdint.h> visible.])
+ AH_VERBATIM([__STDC_LIMIT_MACROS_ZZZ],
+[/* Ensure that <stdint.h> defines the limit macros, since gnulib's
+ <inttypes.h> relies on them. */
+#if defined __cplusplus && !defined __STDC_LIMIT_MACROS && __STDC_LIMIT_MACROS_TRIGGER
+# define __STDC_LIMIT_MACROS 1
+#endif
+])
+