Experimental Physics and
Industrial Control System

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

Subject:	Re: Stream fails on windows-x64 against base-7.0.2
From:	Ralph Lange via Tech-talk <[email protected]>
To:	EPICS Tech Talk <[email protected]>
Cc:	"Gofron, Kazimierz" <[email protected]>
Date:	Thu, 20 Dec 2018 21:54:02 +0100

Hi,

That seems to be a problem with Windows DLL decorations on functions/variables.

It may appear when a source file (in your case the sources for the three .obj files in your error message) does not include a header file for things it uses in the import section of its #include block. The symbols might still be defined (through secondary include by one of your own header files from the export part of the #include block) but in that case they get marked as exported (instead of imported) so the linker searches for them in your objects (not in the libraries).

In principle, your source does

#include <system-bla> // this is the import section, external symbols are marked as being DLL-imported

#include <epics-bla>

#include <epicsExport.h> // from here Windows starts marking external symbols as being DLL-exported

#include <myHeader.h>

#include <myOtherHeader.h>

[...]

Now, if your source uses pdbbase (which is declared in dbAccessDefs.h), but relies on dbAccessDefs.h being included by myHeader.h, pdbbase will be declared after switching to export mode and be marked as exported, which is wrong.

Solution: #include <dbAccessDefs.h> in the source that uses its symbols, in the upper section (*before* including <epicsExport.h>) and it will be marked correctly.

Sorry if this sounds complicated. It is.

Cheers,
~Ralph

On Thu, 20 Dec 2018 at 21:34, Gofron, Kazimierz via Tech-talk <[email protected]> wrote:

Stream master release, cloned today.

C:\epics\support\stream>git branch

* master

From: Mark Rivers <[email protected]>
Sent: Thursday, 20 December 2018 3:18 PM
To: Gofron, Kazimierz <[email protected]>
Cc: [email protected]
Subject: RE: Stream fails on windows-x64 against base-7.0.2

You didn’t tell us what version of stream you are using. It is building OK for me on Windows.

Mark

From: [email protected] <[email protected]> On Behalf Of Gofron, Kazimierz via Tech-talk
Sent: Thursday, December 20, 2018 1:38 PM
To: '[email protected]' <[email protected]>
Subject: Stream fails on windows-x64 against base-7.0.2

I am using:

Windows 10 Pro

Visual Studio 2010 Professional
Make 4.2.1 (from the EPICS web site)
Strawberry perl (v5.28.1.1)
This issue is similar to:

https://github.com/epics-modules/softGlue/issues/1

and

https://github.com/epics-modules/sscan/issues/3

link -nologo -subsystem:windows -dll -LTCG -incremental:no -opt:ref -release -MACHINE:X64 -out:stream.dll -implib:stream.lib DebugInterface.obj DummyInterface.obj AsynDriverInterface.obj EnumConverter.obj BCDConverter.obj RawConverter.obj RawFloatConverter.obj BinaryConverter.obj ChecksumConverter.obj MantissaExponentConverter.obj TimestampConverter.obj devaoStream.obj devaiStream.obj devboStream.obj devbiStream.obj devmbboStream.obj devmbbiStream.obj devmbboDirectStream.obj devmbbiDirectStream.obj devlongoutStream.obj devlonginStream.obj devstringoutStream.obj devstringinStream.obj devwaveformStream.obj devcalcoutStream.obj devaaiStream.obj devaaoStream.obj devscalcoutStream.obj StreamVersion.obj StreamBuffer.obj StreamError.obj StreamProtocol.obj StreamFormatConverter.obj StreamCore.obj StreamBusInterface.obj StreamEpics.obj c:/epics/support/asyn/lib/windows-x64/asyn.lib c:/epics/base-7.0.2/lib/windows-x64/dbRecStd.lib c:/epics/base-7.0.2/lib/windows-x64/dbCore.lib c:/epics/base-7.0.2/lib/windows-x64/ca.lib c:/epics/base-7.0.2/lib/windows-x64/Com.lib

Creating library stream.lib and object stream.exp

devaoStream.obj : error LNK2001: unresolved external symbol interruptAccept

devwaveformStream.obj : error LNK2001: unresolved external symbol pamapdbfType

StreamEpics.obj : error LNK2001: unresolved external symbol pdbbase

stream.dll : fatal error LNK1120: 3 unresolved externals

make[3]: *** [c:/epics/base-7.0.2/configure/RULES_BUILD:292: stream.dll] Error 1120

make[3]: Leaving directory 'C:/epics/support/stream/StreamDevice/src/O.windows-x64'

make[2]: *** [c:/epics/base-7.0.2/configure/RULES_ARCHS:58: install.windows-x64] Error 2

make[2]: Leaving directory 'C:/epics/support/stream/StreamDevice/src'

make[1]: *** [c:/epics/base-7.0.2/configure/RULES_DIRS:84: src.install] Error 2

make[1]: Leaving directory 'C:/epics/support/stream/StreamDevice'

make: *** [configure/RULES_DIRS:88: StreamDevice.install] Error 2

Kaz

References:: Stream fails on windows-x64 against base-7.0.2 Gofron, Kazimierz via Tech-talk; RE: Stream fails on windows-x64 against base-7.0.2 Mark Rivers via Tech-talk; RE: Stream fails on windows-x64 against base-7.0.2 Gofron, Kazimierz via Tech-talk

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ANJ, 20 Dec 2018

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System