Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Wed, 19 Oct 2022 08:49:17 -0700

On 10/18/22 07:16, Érico Nogueira Rolim wrote:

On 17/10/2022 17:49, Michael Davidsaver wrote:

On 10/17/22 11:08, Érico Nogueira Rolim via Tech-talk wrote:

Did I miss something about building a static IOC? Having to mess around
in the epics-base files doesn't seem ideal... To cover all my bases, I
also tried doing this on epics-base 7.0.7, which required the same steps
to spit out a static executable.

The developers of glibc try to discourage completely static linking
as some parts of libc.so will implicitly try to load plugin libraries
for things like user account database and hostname lookup.  There are
also some hardcoded paths which distro libraries may have changed.

I am aware of the glibc stance, but IMHO that's no reason for the build
system to keep me from building things statically myself. I'm not sure
what the current progress on this is, but a built-in DNS resolver for
statically linked applications was even being considered, seeing as
statically linked binaries have their place and that was a rather large
limitation for no good reason.

Of course "large limitation" is a matter of prospective :)
I guess at option like "STATIC_BUILD=REALLY" could be added.

STATIC_LDLIBS_REALLY = -static

My only slight reservation is about adding yet another build system
option which would likely not get much testing.  Then again, we have
no shortage of these already, so what is one more?

I'm interested in getting epics to work on musl libc as well (it just
needs some handling around the <execinfo.h> bits iirc), which is
statically linking friendly, and again the build system would be the
only thing stopping that from working out of the box once the source
issues are fixed.

Speaking of awareness of stances...

https://bugs.launchpad.net/epics-base/+bug/1892190

Since musl doesn't identify itself, you can define "__UCLIBC_MAJOR__"
as musl and uclibc have a similar set of idiosyncrasies.

OP_SYS_CPPFLAGS += -D__UCLIBC_MAJOR__

https://stackoverflow.com/questions/57476533/why-is-statically-linking-glibc-discouraged

(the first google result for "glibc static linking")

Of course, there are some cases where this may not practically be
avoided.  Such as you describe where (I assume) you don't have
access to the toolchain which was used to build the system libraries.

In such a case I guess you will have to hope for the best!

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System