In the last few commits, a second patch was added to the LLVM toolchain,
and it no longer uses our binutils patch. This commit changes the CI
cache keys accordingly, in order to prevent unnecessary rebuilds of both
toolchains when only one is changed.
The Clang toolchain's cache now only takes into account patches that
begin with `llvm`, and the GNU toolchain excludes those from the hash
calculation. We now also hash the two CMake cache files that we use for
building LLVM and its runtime libraries.
As of the Clang 13 upgrade, we only need to build the toolchain once and
can use that toolchain for both x86_64 and i686. To do this, this breaks
the main Azure configuration into 3 "stages" (Lagom, Toolchain, and
Serenity), where the Serenity stage depends on the Toolchain stage.
This has the added benefit of uploading a new prebuilt toolchain cache
sooner than before, which should help alleviate pressure from PRs.
We bust the prebuilt cache when any header in e.g. LibC changes. Doing a
full toolchain rebuild probably isn't necessary, so this adds a separate
ccache to speed up toolchain builds.
Currently, the templated steps in Caches.yml rely on the environment
variable CCACHE_DIR being set to configure the ccache location. To
prepare for multiple ccache paths, do not rely on this environment
variable because only one ccache can use it at a time. Instead, pass
the path into the template as a parameter.
Moving this helper CMake file to the centralized Meta/CMake folder helps
to get a better grasp on what extra files are required for the build,
and what files are generated.
While we're at it, don't use add_compile_definitions for
ENABLE_UNICODE_DATA, which only needs to be seen by LibUnicode sources.
There is a bit of a race here between the Fuzzer and non-Fuzzer Lagom
builds. If the Unicode caches are empty, and the Fuzzer build completes
first, then the UCD and CLDR directories will be empty or won't exist.
Skip handling the Unicode caches for this build.
Caches on Azure are immutable - so if a cache changes, but its key does
not, then the cache is not updated. Include a timestamp in the ccache
key so that we always push an updated cache from the master branch. Then
use a subkey without the timestamp to pull the cache.
We use a similar trick on GitHub Actions.
We were over-hashing for the GNU build on GitHub Actions by including
the LLVM patch as well. The GNU Toolchain doesn't care about our LLVM
patches.
For Azure, fix the inversion of the condition for which jobs check which
Build*.sh script, and add the Toolchain patch files to the cache
hash calculation.
