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# No sources_assignment_filter
There is a [strong][0] [consensus][1] that the set_sources_assignment_filter
feature from GN is a mis-feature and should be removed. This requires that
Chromium's BUILD.gn file stop using the feature.
Since October 2020, the filter is no longer used.
Chromium build does not set a default sources assignment filter, and all build
files must manage `sources` with explicit `if` statements.
## Explicit assignment
If you have a target that have platform specific implementation files, you can
use the following pattern:
```
source_set("foo") {
sources = [
"foo.h",
]
if (is_mac) {
sources += [
"foo_mac.mm",
]
}
if (is_win) {
sources += [
"foo_win.cc",
]
}
if (is_linux) {
sources += [
"foo_linux.cc",
]
}
}
```
[0]: https://groups.google.com/a/chromium.org/d/topic/chromium-dev/hyLuCU6g2V4/discussion
[1]: https://groups.google.com/a/chromium.org/d/topic/gn-dev/oQcYStl_WkI/discussion
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