No further comment, so I pushed that patch into gnulib,
with the following further changes to document it:
* doc/posix-headers/inttypes.texi (inttypes.h):
* doc/posix-headers/stdint.texi (stdint.h): Document this.
diff --git a/doc/posix-headers/inttypes.texi b/doc/posix-headers/inttypes.texi
index c1720e5..6ef87bb 100644
--- a/doc/posix-headers/inttypes.texi
+++ b/doc/posix-headers/inttypes.texi
@@ -22,6 +22,10 @@ NetBSD 3.0, OpenBSD 3.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, BeOS.
The declarations of @code{strtoimax} and @code{strtoumax} are missing on some
platforms:
OpenBSD 3.8, AIX 4.3.2, AIX 5.1 (missing only @code{strtoumax}), OSF/1 5.1.
+@item
+On some hosts that predate C++11, when using C++ one must define
+@code{__STDC_FORMAT_MACROS} to make visible the declarations of format
+macros such as @code{PRIdMAX}.
@end itemize
Portability problems not fixed by Gnulib:
diff --git a/doc/posix-headers/stdint.texi b/doc/posix-headers/stdint.texi
index 3730166..be19269 100644
--- a/doc/posix-headers/stdint.texi
+++ b/doc/posix-headers/stdint.texi
@@ -27,6 +27,12 @@ HP-UX 11.23.
The macros @code{WCHAR_MIN} and @code{WCHAR_MAX} are not defined in
@code{<stdint.h>} (only in @code{<wchar.h>}) on some platforms:
Dragonfly, BSDI.
+@item
+On some hosts that predate C++11, when using C++ one must define
+@code{__STDC_CONSTANT_MACROS} to make visible the definitions of
+constant macros such as @code{INTMAX_C}, and one must define
+@code{__STDC_LIMIT_MACROS} to make visible the definitions of limit
+macros such as @code{INTMAX_MAX}.
@end itemize
Portability problems not fixed by Gnulib:
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