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feat(tvix/eval): implement builtins.currentSystem

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This commit implements builtins.currentSystem, by capturing the
cargo environment variable `TARGET` and exposing it to rustc as
`TVIX_CURRENT_SYSTEM` so it can be inserted into the source code
using `env!()`.

The resulting value needs to be massaged a bit, since it is an "LLVM
triple".  The current code should work for all the platforms for
which cppnix works (thanks qyliss for generating the list!).  It
does *not* reject all of the triples that cppnix's configure.ac
rejects -- it is much more forgiving.  We can tighten this up in a
future commit.

Signed-off-by: Adam Joseph <adam@westernsemico.com>
Change-Id: I947f504b2af5a7fee8cf0cb301421d2fc9174ce1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6986
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
This commit is contained in:
Adam Joseph 2022-10-12 02:26:40 -07:00 • committed by tazjin
parent e2f0967d3f
commit f7ba502005
6 changed files with 360 additions and 0 deletions
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1
tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-builtins.exp
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@ -1 +0,0 @@
/foo

12
tvix/eval/src/tests/nix_tests/notyetpassing/eval-okay-builtins.nix
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@ -1,12 +0,0 @@
assert builtins ? currentSystem;
assert !builtins ? __currentSystem;
let {
x = if builtins ? dirOf then builtins.dirOf /foo/bar else "";
y = if builtins ? fnord then builtins.fnord "foo" else "";
body = x + y;
}