Re: static libraries

["Siddons, David via Tech-talk" <tech-talk at aps.anl.gov>]

Thanks very much Mark and Jakub, that fixed it. Indeed the error message is confusing; I spent some time looking for a static configuration!

Pete.

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From: Mark Rivers <rivers at cars.uchicago.edu>
Sent: Monday, September 18, 2023 2:52 PM
To: Siddons, David <siddons at bnl.gov>
Cc: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: static libraries

 

Hi Pete, 

That fact that it says it is looking for a static library is misleading. It really just means it cannot find the library at all.  You need to change the Makefile to:

ssd1306_i2c_DIR    = /usr/local/lib/

That is telling where to find that specific library.

You could probably also eliminate that line and use:

display_SYS_LIBS   += ssd1306_i2c

assuming /usr/local/lib is in the default system library search path.

Mark

Sent from my iPhone

On Sep 18, 2023, at 2:32 PM, Siddons, David via Tech-talk <tech-talk at aps.anl.gov> wrote:



Hi Tech-talk,

I need to use a library in an EPICS app, set up using MakeBaseApp. It wants to have a static version of the library, which the library package doesn't supply. Why does it need the static library? I'm not trying to build a static program. Here's the Makefile fragment which builds it:

PROD_HOST += display

display_SRCS   += display.c

display_LIBS   += ezca

display_DIR    = /usr/local/lib/

display_LIBS   += ssd1306_i2c

display_LIBS   += $(EPICS_BASE_HOST_LIBS)

and it gives:

make[1]: *** No rule to make target '../../lib/linux-arm/libssd1306_i2c.a', need
ed by 'display'.  Stop.

I'm building it natively on a Zynq Debian 10 system. The shared libraries are in /usr/local/lib:

/usr/local/lib/libssd1306_i2c.la  /usr/local/lib/libssd1306_i2c.so.0
/usr/local/lib/libssd1306_i2c.so  /usr/local/lib/libssd1306_i2c.so.0.0.3

Pete.