Re: STATIC_BUILD=NO howto ?

[Mark Rivers via Core-talk <core-talk at aps.anl.gov>]

Hi Torsten and Ralph,

• Btw. I should have mentioned before: You only need to add the *_DIR line if the library is not in one of the system paths. Libraries in system paths are always found - adding them to *_LIBS is enough.
  

Actually if the library is in the system path then it needs to be added to SYS_LIBS, not _LIBS.

This is an example of a Makefile that allows the vendor library to either be in a system location or in a user-defined location.  The latter might be used when the developer does not have permission to install the vendor library into a system location, or wants to test a newer version than the one in the system location:

https://github.com/epics-modules/measComp/blob/master/measCompApp/src/Makefile

CONFIG_SITE contains these lines:

#################################

# Set this if the Measurement Computing uldaq library is installed on Linux.

# If this is not YES then this module will not be built on Linux.

HAVE_ULDAQ=YES

# If libuldaq on Linux is not installed in a system directory (e.g. /usr/local)

# then uncomment and edit these lines to define the location of the include and lib directories.

#ULDAQ_DIR=/home/epics/local/lib

#ULDAQ_INCLUDE=/home/epics/local/include

#################################

The Makefile contains these lines:

#################################

ifdef ULDAQ_INCLUDE

  USR_INCLUDES_Linux += -I$(ULDAQ_INCLUDE)

endif

ifdef ULDAQ_DIR

  uldaq_DIR = $(ULDAQ_DIR)

endif

ifeq ($(HAVE_ULDAQ), YES)

  LIBRARY_IOC_Linux+= measComp

endif

ifdef ULDAQ_DIR

  measCompApp_LIBS_Linux += uldaq

else

  measCompApp_SYS_LIBS_Linux += uldaq

endif

measCompApp_SYS_LIBS_Linux += usb-1.0

#################################

So if ULDAQ_DIR is defined then it adds uldaq to LIBS. If ULDAQ_DIR is not defined then it adds uldaq to SYS_LIBS.  

It handles Linux and Windows separately because the vendor provides a pre-built library for Windows which I include in the EPICS module, but they provide source code on Linux which needs to be built locally.  That can be installed into a system directory or not depending on developer privileges.

Mark

---

From: Core-talk <core-talk-bounces at aps.anl.gov> on behalf of Ralph Lange via Core-talk <core-talk at aps.anl.gov>
Sent: Tuesday, June 13, 2023 7:25 AM
To: Torsten Bögershausen <Torsten.Bogershausen at ess.eu>
Cc: EPICS Core Talk <core-talk at aps.anl.gov>
Subject: Re: STATIC_BUILD=NO howto ?

 

Well,

In that Makefile, the PROD is "ethercatmc", not "ethercatmcsupport".

ethercatmc_LIBS += Vendor

Vendor_DIR = /usr/local/lib

should construct the linker line as you expect.

Btw. I should have mentioned before: You only need to add the *_DIR line if the library is not in one of the system paths. Libraries in system paths are always found - adding them to *_LIBS is enough.

Cheers,

~Ralph