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<== Date ==> <== Thread ==>

Subject: EPICS 7 incompatibility in errMdef.h
From: Dirk Zimoch via Core-talk <core-talk@aps.anl.gov>
To: EPICS Core Talk <core-talk@aps.anl.gov>
Date: Tue, 2 Apr 2019 16:24:26 +0200
[I had originally sent this to tech-talk instead of core-talk by accident. Sorry for the spam.]

Hi folks,

Today while compiling a driver for EPICS 7 I found an incompatibility.

The function definition errSymbolAdd() (and others) have disappeared from errMdef.h. Thus when compiling a driver including errMdef.h and using errSymbolAdd(), I get a compiler warning because of the missing function prototype.

The prototypes are now in the new header file errSymTbl.h. But simply including the new file instead is no good solution, because then the driver does not compile with older EPICS versions any more.

Instead I have use compiler branches based on EPICS versions. That is a bit inconvenient.

What is the policy about backward compatibility in EPICS 7? Should we expect more compatibility breaking changes in the future in an attempt to "move forwards" or will EPICS 7 aim to stay backward compatible for 3rd party code like drivers?

Dirk

Replies:
Re: EPICS 7 incompatibility in errMdef.h Dirk Zimoch via Core-talk
Re: EPICS 7 incompatibility in errMdef.h Johnson, Andrew N. via Core-talk

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