[Xen-devel] How to compile Xen 4.12 with Clang on Linux?

["Johnson, Ethan" <ejohns48@xxxxxxxxxxxxxxxx>]

Hi all,

I'm trying to compile Xen 4.12 with Clang (v7.0.0) for a research 
project. I see in the README distributed with the Xen 4.12 source code 
that Clang/LLVM 3.5 and newer are supported as the compiler for building 
Xen. However, when I actually try it, it doesn't work - the configure 
script seems to recognize that I've indicated clang as the preferred 
compiler, but the actual "make" step seems to ignore it and issue gcc 
commands anyway.

I tried a few different command line invocations, all with the same 
result (note: my clang is installed from the Ubuntu 18.04 repositories 
as "clang-7" and "clang++-7" respectively):

[Attempt #1:]
CC=clang-7 CXX=clang++-7 ./configure --enable-systemd
make -j24 world

[Attempt #2:]
./configure --enable-systemd CC=clang-7 CXX=clang++-7
make -j24 world

[Attempt #3:]
export CC=clang-7
export CXX=clang++-7
make -j24 world

I'm guessing I'm missing a key step here, but I'm not seeing anything in 
the documentation (README, wiki, etc.) to indicate what that might be. 
Anyone have any suggestions?

Note (in case it matters) that I'm doing this on x86-64 Linux (Linux 
Mint 19.1 to be exact, which is based on Ubuntu 18.04). When I searched 
online and on the Xen mailing lists for references to building with 
clang they mostly seemed to be in the context of BSD or ARM platforms.

Much thanks,
Ethan Johnson

-- 
Ethan J. Johnson
Computer Science PhD student, Systems group, University of Rochester
ejohns48@xxxxxxxxxxxxxxxx
ethanjohnson@xxxxxxx
PGP public key available from public directory or on request

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