I used nix-instantiate to verify that the derivations for chromium and
ungoogled-chromium remain unchanged (only the meta attributes change
slightly as I added myself as ungoogled-chromium to receive
notifications for PRs/issues).
The gn version depends on the channel and new gn versions aren't always
backward compatible. Therefore we should also include it in
upstream-info.json (I've scoped it under "deps" as we'll likely have to
add more like this in the future).
LLD: https://lld.llvm.org/
When you link a large program on a multicore machine, you can expect that LLD runs more than twice as fast as the GNU gold linker. Your mileage may vary, though.
Link-time optimization (LTO) is supported by default.
Some default settings have been tuned for the 21st century. For example, the stack is marked as non-executable by default to tighten security.
LTO & ThinLTO: https://clang.llvm.org/docs/ThinLTO.html
LTO (Link Time Optimization) achieves better runtime performance through whole-program analysis and cross-module optimization. However, monolithic LTO implements this by merging all input into a single module, which is not scalable in time or memory, and also prevents fast incremental compiles. ThinLTO is a new approach that is designed to scale like a non-LTO build, while retaining most of the performance achievement of full LTO.
PGO: https://llvm.org/docs/HowToBuildWithPGO.htmlhttps://blog.chromium.org/2020/08/chrome-just-got-faster-with-profile.html
Allows your compiler to better optimize code for how it actually runs. Users report that applying this to Clang and LLVM can decrease overall compile time by 20%.
Because PGO uses real usage scenarios that match the workflows of Chrome users around the world, the most common tasks get prioritized and made faster. Delivers up to 10% faster page loads.
CFI: https://clang.llvm.org/docs/ControlFlowIntegrity.htmlhttps://www.chromium.org/developers/testing/control-flow-integrity
Aborts the program upon detecting certain forms of undefined behavior that can potentially allow attackers to subvert the program’s control flow. These schemes have been optimized for performance, allowing developers to enable them in release builds.
By default, a program compiled with CFI will crash with SIGILL if it detects a CFI violation.
Additionally:
Use minizip instead of zlib. Chromium says zlib but actually uses minizip.
Remove old unused workarounds.
Make shell scripts POSIX compliant.
Update documentation URLs.
Prepare for using system libraries.
This should also fix VA-API for chromiumBeta (though that part needs
some cleanup). However, chromiumDev likely still fails due to the
absence of dirmd (not included in the tarball so far, we might have to
package and add it as a dependency).
Wanted to do this for a long time to collect important knowledge and
make it easier to pass maintainership.
Only time will tell if this'll be useful or become outdated instead.
Chromium 86.0.4240.75 builds fine without this patch. And since
WEBP_MAX_DIMENSION is the same in the system libwebp this patch should
not be required anymore (it was introduced in 06ec2a9f19, apparently to
fix the build).
By default GN produces a build with all of the debug assertions enabled (is_debug=true) and including full debug info (symbol_level=2). Setting symbol_level=1 will produce enough information for stack traces, but not line-by-line debugging. Setting symbol_level=0 will include no debug symbols at all. Either will speed up the build compared to full symbols.
This is done to avoid driver specific issues and restores the previous
behaviour. Like before video acceleration can be enabled without having
to rebuild Chromium.
This will additionally install the following files:
libEGL.so libGLESv2.so
libVkICD_mock_icd.so libvk_swiftshader.so libvulkan.so
libEGL.so and libGLESv2.so are required to fix our ANGLE support.
The rest should help with the Vulkan support (currently an experimental
feature that is disabled by default).
update.nix was a huuuuge hack, abusing checksum collisions, etc., and
was extremely difficult to read and maintain, especially because
values from update.nix were also used in the derivations themselves!
I've replaced this with an implementation in Python, which I chose for
readability. Rather than generating Nix, I chose to
generate JSON, since Python can do that in the standard library and
Nix can read it.
I also set update.py as an updateScript, so Chromium can now
automatically be updated!
Fixes: https://github.com/NixOS/nixpkgs/issues/89635
Note: The following might also need to be updated:
substituteStream(): WARNING: pattern '/usr/share/xcb' doesn't match anything in file 'ui/gfx/x/BUILD.gn'
I didn't look into this yet but IIRC M86 will finally have a flag for
Linux to enable VA-API. So we shouldn't need
enable-video-acceleration-on-linux.patch anymore.
But we likely need to update enable-vdpau-support-for-nvidia.patch
when/before M86 hits the stable channel if we want to keep VDPAU
support.
Ok, so I was about to update the patch (didn't apply anymore) when I
also started looking at it's usage and realized that
NIX_CHROMIUM_PLUGIN_PATH_ (and other substrings) only appears in the
patch itself (i.e. it seemed like we don't need this patch anymore).
Turns out that we have this patch since 2014 (1b84fbf0ca) and it was
only ever used for NIX_CHROMIUM_PLUGIN_PATH_WIDEVINE (and from the log
it isn't clear if/when or how well that worked). But in 2019 that last
usage got removed (545d58a1ef) so we should be able to safely drop this
patch now :) \o/
(I just wanted to note that as it seemed somewhat of a funny story :D
But there is of course nothing wrong with it.)
Git history (git log --oneline -S NIX_CHROMIUM_PLUGIN_PATH_):
7205bd64a3 ungoogled-chromium: init at 81.0.4044.92-2
545d58a1ef chromium: fix widevine
cd3283f921 chromium: 67.0.3396.99 -> 68.0.3440.75
72d7b5ddb1 chromium: fix nix_plugin_paths for 68+
7a3a16dd80 chromium: Remove plugin paths patch for version 50
79d18eb604 chromium: Update dev channel to v52.0.2743.10
c7a3645e7b chromium: Remove stuff for versions <= v51
8b97ca270e chromium: Update all channels to latest versions
b9093f1c64 chromium: Updates, fixes#11492471cdd15e2 chromium: Update beta and dev channels.
5c6aa391fc chromium: Cleanup old patch and update stable
af54ddf8b6 chromium: Drop plugin_paths patch for old versions.
6a8afa4bb3 chromium: Fix plugin_paths patch for version 44.
0aad4b7ee4 chromium: Update all channels to latest versions.
1b84fbf0ca chromium: Allow env vars for passing plugin paths.
After making `ffmpeg` point to the latest `ffmpeg_4`, all packages that
used `ffmpeg` without requiring a specific version now use ffmpeg_3
explicitly so they shouldn't change.
This provides the browser flag #enable-webrtc-pipewire-capturer, which
adds support for screensharing on Wayland via xdg-desktop-portal.
The browser flag is disabled by default until a user enables it. At
least one other major distribution (Arch) enables this compile time
option, and so I believe it should be safe to enable by default.
This is also needed to support xdg-desktop-portal-wlr which was added in
https://github.com/NixOS/nixpkgs/pull/83485.
The configuration phase was failing due to:
```
configuring
ERROR at //BUILD.gn:1376:5: Unknown function.
filter_exclude([ "$root_build_dir/foo" ],
^-------------
```
This can e.g. save around 150k lines of unnecessary log messages which
take up around 66% of the total lines (based on a log of 80.0.3987.100):
29527 warning: unknown warning option '-Wno-bitwise-conditional-parentheses'; did you mean '-Wno-bitwise-op-parentheses'? [-Wunknown-warning-option]
29527 warning: unknown warning option '-Wno-builtin-assume-aligned-alignment' [-Wunknown-warning-option]
29527 warning: unknown warning option '-Wno-deprecated-copy'; did you mean '-Wno-deprecated'? [-Wunknown-warning-option]
29527 warning: unknown warning option '-Wno-final-dtor-non-final-class'; did you mean '-Wno-abstract-final-class'? [-Wunknown-warning-option]
29527 warning: unknown warning option '-Wno-implicit-int-float-conversion'; did you mean '-Wno-implicit-float-conversion'? [-Wunknown-warning-option]
This makes it possible to use chromium headless with WebGL
(e.g. for webdriver tests) without having to rebuild from source.
The upstram default is to enable, thus simply removing our disabling switch.
Also fixes#41918.
