Auto merge of #2420 - RalfJung:num_cpus, r=RalfJung

move num_cpus test from test-cargo-miri to crate test

test-cargo-miri/Cargo.lock

@@ -48,15 +48,6 @@ dependencies = [
 name = "exported_symbol_dep"
 version = "0.1.0"
 
-[[package]]
-name = "hermit-abi"
-version = "0.1.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "issue_1567"
 version = "0.1.0"
@@ -83,22 +74,6 @@ version = "0.1.0"
 name = "issue_rust_86261"
 version = "0.1.0"
 
-[[package]]
-name = "libc"
-version = "0.2.126"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "349d5a591cd28b49e1d1037471617a32ddcda5731b99419008085f72d5a53836"
-
-[[package]]
-name = "num_cpus"
-version = "1.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "19e64526ebdee182341572e50e9ad03965aa510cd94427a4549448f285e957a1"
-dependencies = [
- "hermit-abi",
- "libc",
-]
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.40"
@@ -132,7 +107,7 @@ dependencies = [
 name = "subcrate"
 version = "0.1.0"
 dependencies = [
- "num_cpus",
+ "byteorder 1.4.3",
 ]
 
 [[package]]

test-cargo-miri/subcrate/Cargo.toml

@@ -18,4 +18,4 @@ path = "test.rs"
 harness = false
 
 [dev-dependencies]
-num_cpus = "1.10.1"
+byteorder = "1.0"

test-cargo-miri/subcrate/test.rs

@@ -1,5 +1,7 @@
 use std::env;
 
+use byteorder::{ByteOrder, LittleEndian};
+
 fn main() {
     println!("subcrate testing");
 
@@ -11,6 +13,6 @@ fn main() {
     let crate_dir = crate_dir.to_string_lossy().replace("\\", "/");
     assert_eq!(env_dir, crate_dir);
 
-    // Make sure we can call `num_cpus`.
-    num_cpus::get();
+    // Make sure we can call dev-dependencies.
+    let _n = <LittleEndian as ByteOrder>::read_u32(&[1, 2, 3, 4]);
 }

test_dependencies/Cargo.lock

@@ -107,6 +107,7 @@ dependencies = [
  "getrandom 0.1.16",
  "getrandom 0.2.7",
  "libc",
+ "num_cpus",
  "page_size",
  "rand",
  "tokio",

test_dependencies/Cargo.toml

@@ -12,6 +12,7 @@ edition = "2021"
 tokio = { version = "1.0", features = ["full"] }
 libc = "0.2"
 page_size = "0.4.1"
+num_cpus = "1.10.1"
 
 getrandom_1 = { package = "getrandom", version = "0.1" }
 getrandom_2 = { package = "getrandom", version = "0.2" }

tests/pass/crates/num_cpus.rs

@@ -0,0 +1,5 @@
+//@compile-flags: -Zmiri-disable-isolation
+
+fn main() {
+    assert_eq!(num_cpus::get(), 1);
+}

tests/pass/crates/random.rs

@@ -1,6 +1,6 @@
-use rand::{rngs::SmallRng, Rng, SeedableRng};
 // mac-os `getrandom_1` does some pointer shenanigans
 //@compile-flags: -Zmiri-permissive-provenance
+use rand::{rngs::SmallRng, Rng, SeedableRng};
 
 fn main() {
     // Test `getrandom` directly (in multiple different versions).