Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Fri, 15 Aug 2014 12:19:27 -0500

On 08/15/2014 10:34 AM, Mark Rivers wrote:
> But I think there is a limitation with EPICS 3.14 because there is no
> architecture-independent definition of 64-bit integer data types.
> The 64-bit types epicsInt64 and epicsUIn64 are only defined if
> __STDC_VERSION__ >= 199901L.  There are a number of architectures
> that support 64-bit integers (e.g. Windows) but don't define the
> EPICS types because they fail the STDC_VERSION test.

The 3.15.1 release of Base, due in December, will provide the 64-bit
integer types for all architectures. We didn't want to add them to 3.14
because that is still supposed to build on VxWorks 5.4.2 which does not
provide complete support for long long integers.

[Technical aside: The __STDC_VERSION__ >= 199901L test is wrong anyway;
it can only succeed in C code since the C++ pre-compiler never defines
that macro. Thus C++ code will never see the epics[U]Int64 type
definitions in 3.14, and I suspect there are other issues with those C99
definitions which I will probably remove in 3.15.]

The Base 3.15.1 release will require VxWorks 5.5.2 or later, which do
support 64-bit integer operations. However even the latest VxWorks
6.9.4.1 release omits the strtoll() and strtoull() routines, so we may
provide them ourselves through epicsStdlib.h.

I have been working on adding DBF_INT64 and DBF_UINT64 field types to
the IOC, but this work could break existing device support code and will
not appear until Base 3.16 at the earliest.

- Andrew
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System