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XenSummit: Empty per-arch files
- To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 28 Jun 2023 12:32:39 +0100
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bobby Eshleman <bobbyeshleman@xxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, Timothy Pearson <tpearson@xxxxxxxxxxxxxxxxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hello,
This wasn't a formal discussion point at XenSummit, but Oleksii pointed
out that it was still a problem, hence this thread.
As we take on more architectures, it becomes more and more important for
things to be handled in a mostly-common way. With that comes quite a
lot of <xen/foo.h> including <asm/foo.h>, and the arch one being a stub
in simple cases.
It would be nice to get rid of the stub files; they're irritating to
deal with, both when refactoring and simply for the file bloat they create.
There are two options which come to mind.
1) Use __has_include(). This would be ideal, but would require us
bumping the minimum GCC version to 4.9.2 as a prerequisite. I'm not
aware of any way to emulate the necessary behaviour on older toolchains.
2) Have a stub "architecture" which is always last on the include path.
This would reduce the number of stub files from one set per arch, to
only one set.
Anything else that I've missed?
~Andrew
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