On 02.04.19 16:24, Dirk Zimoch via Core-talk wrote:
[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
The question is actually: Should I consider this a bug in EPICS 7 (and
propose a fix)? Or was there a good reason for it and should I better
put a preprocessor branch in the driver? (With the changes e.g. in rset
and maybe in the future in dset as well such a branch may probably
sooner or later be necessary anyway.)
- Replies:
- Re: EPICS 7 incompatibility in errMdef.h Michael Davidsaver via Core-talk
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- EPICS 7 incompatibility in errMdef.h Dirk Zimoch via Core-talk
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