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Re: [Xen-devel] How to compile Xen 4.12 with Clang on Linux?
- To: "Johnson, Ethan" <ejohns48@xxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 21 Jun 2019 00:01:32 +0100
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- Delivery-date: Thu, 20 Jun 2019 23:01:44 +0000
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On 20/06/2019 23:37, Johnson, Ethan wrote:
> 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
Xen itself doesn't use autoconf, and needs a bit of extra help getting
its options in order. There is an extra clang=y variable which you need
to pass.
xen.git$ make -C xen/ CC=clang-7 clang=y
~Andrew
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