Serenity build tooling autodetects gcc 10 so update-alternatives
is not necessary. Also, switching apt repositories on the fly can
cause issues with dependencies, package downgrades and leave the
system in a broken state.
After discussing on Discord about how to speed up the build time, I
received lots of helpful advice on measuring the build time, but none of
it was easily accessible. I thought other people might find it useful,
so I've written it down! :^)
Thanks goes to @bgianfo and @nico.
GCC and Clang allow us to inject a call to a function named
__sanitizer_cov_trace_pc on every edge. This function has to be defined
by us. By noting down the caller in that function we can trace the code
we have encountered during execution. Such information is used by
coverage guided fuzzers like AFL and LibFuzzer to determine if a new
input resulted in a new code path. This makes fuzzing much more
effective.
Additionally this adds a basic KCOV implementation. KCOV is an API that
allows user space to request the kernel to start collecting coverage
information for a given user space thread. Furthermore KCOV then exposes
the collected program counters to user space via a BlockDevice which can
be mmaped from user space.
This work is required to add effective support for fuzzing SerenityOS to
the Syzkaller syscall fuzzer. :^) :^)
This removes the '$' character so that it is easier to copy commands
directly from the build instructions and then executing them without
first having to remove the '$' character.
The WASM spec tests caused a stack overflow when generated with wat2wasm
version 1.0.23, which ships with homebrew. To give feature parity,
manually download the same version from GitHub packages for Ubuntu.
Document the dependencies of the WASM spec tests option, as well.
This is no longer relevant for most users because due to an
unrelated change to Meta/run.sh the default display backend is now
SDL which does not exhibit this problem.
The x86_64 QEMU binary supports both i386 as well as x86_64 guests.
By using the x86_64 binary users won't have to change anything when
switching between i386 and x86_64 builds.
People are commonly asking about a package manager in
serenity. This patch adds an answer the FAQ, explaining
why there is no need for packages as well as different
possible ways to add or remove software installed on the
system.
This workaround disables the in-kernel interrupt controller.
This impacts the VM performance and should probably be removed
when the workaround is no longer needed.
This workaround was posed by stelar7.
See #7523
Mention the "Open Project Wizard" where you can set
the CMake options before making the cache.
Remind users to use the "Default" build type
and to build the Toolchain so CMake does not complain.
Because of the added complexity of *non-throwing* `new`, helper methods
for correctly constructing smart pointers were added in a previous
commit. This commit changes the documentation to recommend using these,
and adds examples to aid in correctly determining when to use
non-throwing new when manually creating smart pointers.
Components are a group of build targets that can be built and installed
separately. Whether a component should be built can be configured with
CMake arguments: -DBUILD_<NAME>=ON|OFF, where <NAME> is the name of the
component (in all caps).
Components can be marked as REQUIRED if they're necessary for a
minimally functional base system or they can be marked as RECOMMENDED
if they're not strictly necessary but are useful for most users.
A component can have an optional description which isn't used by the
build system but may be useful for a configuration UI.
Components specify the TARGETS which should be built when the component
is enabled. They can also specify other components which they depend on
(with DEPENDS).
This also adds the BUILD_EVERYTHING CMake variable which lets the user
build all optional components. For now this defaults to ON to make the
transition to the components-based build system easier.
The list of components is exported as an INI file in the build directory
(e.g. Build/i686/components.ini).
Fixes#8048.
PR #7970 added a line clarifying the requirement for QEMU 5.
Unfortunately, this location this line was added changed the meaning
of the following line, referencing the availability of GCC in Ubuntu
20.04.
QEMU 5 is not available in Ubuntu 20.04, so this change is incorrect,
as well as misleading.
