Experimental Physics and
Industrial Control System

Michael Davidsaver <[email protected]> · Fri, 22 Dec 2017 09:12:13 -0600

On 12/22/2017 06:14 AM, Ralph Lange wrote:
> Hi,
> 
> We just found out that we have a set of libraries/applications that use C++11 and thus call the GNU compiler on our RHEL7.4 systems (gcc 4.8.5) with "-std=c==0x".
> 
> When linking, the build searches for pvData/pvAccess functions with the argument type "std::shared_ptr<>", while the EPICS PVA libraries provide the functions for an argument of type "std::tr1::shared_ptr<>", and the linking fails.
> 
> What are our options?

Immediately, in each of the compile units where -std=c++0x is given, define the following before pv/sharedPtr.h is included.

> #define SHARED_FROM_MANUAL
> #include <tr1/memory>

This overrides the logic which selects shared_ptr implementations and always
uses the TR1 implementation directly.  This will work as long as the PVA modules
built with c++98.

Alternately, you can hack pv/sharedPtr.h to make an explicit choice to always use TR1,
or hack Base (the core module) to always default to -std=c++11.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System