Experimental Physics and Industrial Control System
|
Hi Dmitry,
On 4/30/23 12:51 AM, Dmitry Yu.
Bolkhovityanov via Tech-talk wrote:
Well,
that's an elegant albeit a rather non-obvoius implementation.
It's a pity this isn't described somewhere in documentation.
Computed variable names, while giving much flexibility, are
extremely tricky and turn Makefiles into difficult to study, plus
"double-indirect" references entangle things even more (you can't
find anything until you know exactly what to find).
Actually there is documentation for some aspects of the build
system. The Build
Facility chapter of the EPICS Application Developers guide
isn't perfectly up to date (even to the 3.15.9 release you're using)
but it does cover most of the features that are intended to be
available to Makefile authors. Unfortunately the architect and
author of much of the code retired quite a few years ago and wasn't
able to complete an update of that document before she left, but
there are things in that document which show why we use computed
variable names (it just wouldn't be possible to provide the
flexibility it gives us without using that mechanism or using an
external preprocessor like CMake).
- Andrew
--
Complexity is free, it's Simplicity that takes work.
|
- References:
- EPICS 3.15.9 build system weird behaviour upon missing g++ Dmitry Yu. Bolkhovityanov via Tech-talk
- Re: EPICS 3.15.9 build system weird behaviour upon missing g++ Johnson, Andrew N. via Tech-talk
- Re: EPICS 3.15.9 build system weird behaviour upon missing g++ Dmitry Yu. Bolkhovityanov via Tech-talk
- Re: EPICS 3.15.9 build system weird behaviour upon missing g++ Andrew Johnson via Tech-talk
- Re: EPICS 3.15.9 build system weird behaviour upon missing g++ Dmitry Yu. Bolkhovityanov via Tech-talk
- Re: EPICS 3.15.9 build system weird behaviour upon missing g++ Dmitry Yu. Bolkhovityanov via Tech-talk
- Navigate by Date:
- Prev:
Re: EPICS 3.15.9 build system weird behaviour upon missing g++ Dmitry Yu. Bolkhovityanov via Tech-talk
- Next:
Questions about Function: epicsEventWaitWithTimeout (id, timeout) 김대영 via Tech-talk
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
<2023>
2024
- Navigate by Thread:
- Prev:
Re: EPICS 3.15.9 build system weird behaviour upon missing g++ Dmitry Yu. Bolkhovityanov via Tech-talk
- Next:
Could not use autosave with motorOmsAsyn whitetiger1123 via Tech-talk
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
<2023>
2024
|
ANJ, 02 May 2023 |
·
Home
·
News
·
About
·
Base
·
Modules
·
Extensions
·
Distributions
·
Download
·
·
Search
·
EPICS V4
·
IRMIS
·
Talk
·
Bugs
·
Documents
·
Links
·
Licensing
·
|