>> Thanks. However, this still doesn't explain why autoconf (using g++!)
>> says that uint64_t exists: __STDC_LIMIT_MACROS is not used in any part
>> of autoconf.
>
> I think that has been covered...
Nope. A search for __STDC_LIMIT_MACROS within the git repository
gives no results.
>> PS: If using __STDC_LIMIT_MACROS is the `official' way to handle
>> uint64 I suggest to update the autoconf documentation
>> accordingly.
>
> Yes, we definitely need to improve this. Would you mind submitting
> a patch, based on what we have learned in this thread?
Attached.
Werner
======================================================================
2011-12-07 Werner Lemberg <[email protected]>
doc: Mention __STDC_LIMIT_MACROS
* doc/autoconf.texi (Particular Type Checks): We need this
macro for C++ compilation.
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index d7d2231..7685702 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -6680,6 +6680,17 @@ use the results of this macro in C89-or-later code as
follows:
#endif
@end example
+@cvindex __STDC_LIMIT_MACROS
+For C++, you have to insert the line
+
+@example
+#define __STDC_LIMIT_MACROS
+@end example
+
+@noindent
+before including @file{stdint.h}; otherwise macros for minimum and maximum
+sizes like @code{INT8_MIN} or @code{UINT64_MAX} are not defined.
+
This macro caches the type in the @code{ac_cv_c_int8_t} variable.
@end defmac
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