Experimental Physics and
Industrial Control System

"J. Lewis Muir via Tech-talk" <tech-talk at aps.anl.gov> · Tue, 20 Jul 2021 11:32:08 -0500

On 07/20, Philipp Kampmann via Tech-talk wrote:
> A corresponding "compiler/clang" path does not exist in my build. I
> would like to compile epics headers with both, g++ and clang. Does
> someone know if it works and how I can build EPICS with both compilers
> supported?

I'm not sure I understand what you're asking.  Are you trying to compile
one library with GCC and a program that links against it with Clang,
or vice versa?  Basically, you can't mix compilers in this situation
when the library is written in C++.  You need to compile all of your
software where C++ libraries are involved with one compiler.  With C,
you could do this, but with C++ you can't because the implementations of
the standard library are typically not ABI compatible, and since parts
of the EPICS Base libraries are C++, you can't mix compilers with EPICS
Base (e.g., in general it would be unsound to compile EPICS Base with
GCC and then compile a program with Clang that links with one of those
GCC-compiled C++ EPICS Base libraries).

Lewis

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System