I wanted to know what the minimal setup required was to replicate the
compilation instructions featured on https://www.qemu.org/download/#source
> wget https://download.qemu.org/qemu-5.2.0.tar.xz
> tar xvJf qemu-5.2.0.tar.xz
> cd qemu-5.2.0
> ./configure
> make
For fedora:latest, I found that to be:
----
FROM fedora:latest
ENV PACKAGES \
wget \
xz \
ninja-build \
gcc \
glib2-devel \
pixman-devel \
bzip2 \
diffutils \
perl
ENV QEMU_CONFIGURE_OPTS ""
RUN dnf install -y $PACKAGES && \
rpm -q $PACKAGES | sort > /packages.txt
RUN wget https://download.qemu.org/qemu-5.2.0.tar.xz && \
tar xvJf qemu-5.2.0.tar.xz
WORKDIR /qemu-5.2.0
RUN ./configure $QEMU_CONFIGURE_OPTS && \
make -j9
----
Notes:
- our configure file suggests bzip2 is an optional dependency (It's set
to 'auto') but meson will error out if it is not present at
configuration time:
../pc-bios/meson.build:5:2: ERROR: Program 'bzip2' not found
- diffutils is required for the qapi-schema test, which runs at build time.
- early on in the build process, an error "bash: find: command not
found" can be seen, but it doesn't seem to cause a failure otherwise.
- perl is not declared as a hard pre-requisite during configure time,
but the build will error out if it is not present:
[254/8314] Generating texture-blit-frag.h with a meson_exe.py custom command
FAILED: ui/shader/texture-blit-frag.h
/usr/bin/python3 /qemu-5.2.0/meson/meson.py --internal exe --capture
ui/shader/texture-blit-frag.h -- /usr/bin/env perl
/qemu-5.2.0/scripts/shaderinclude.pl ../ui/shader/texture-blit.frag
/usr/bin/env: ‘perl’: No such file or directory
I wanted to try with alpine for the sake of a dependency audit. It isn't
quite "zero conf", but I did get it working by disabling linux-user:
----
FROM alpine:latest
ENV PACKAGES \
wget \
xz \
python3 \
ninja \
gcc \
musl-dev \
pkgconfig \
glib-dev \
pixman-dev \
make \
bash \
perl
ENV QEMU_CONFIGURE_OPTS --disable-linux-user
RUN apk add $PACKAGES
RUN wget https://download.qemu.org/qemu-5.2.0.tar.xz && \
tar xvJf qemu-5.2.0.tar.xz
WORKDIR /qemu-5.2.0
RUN ./configure $QEMU_CONFIGURE_OPTS && \
make -j9
----
Notes:
- "ninja" actually installs "samurai", but it appears to work.
- musl seems to work alright, but does throw a ton of warnings. I didn't
actually run any tests, since they require more dependencies.
- bash has to be installed explicitly. configure/meson do not check for
it, but the build will fail if they aren't present.
- linux-user binaries can't be compiled because alpine's usage of musl;
I didn't look much more closely.
Takeaways:
- You really don't need a lot to build a minimal QEMU. Even the alpine
package list is pretty small.
- meson seems to be handling "absolutely everything is missing"
environments pretty well.
- There are a scant handful of dependencies that could be added to
configure, but you are very likely not to be missing them, so it's low
priority.
--js
