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cargo/tests/testsuite/freshness.rs
Alex Crichton bac300bda0 Add support for -Cembed-bitcode=no 
This commit is the Cargo half of support necessary for
rust-lang/rust#70458. Today the compiler emits embedded bytecode in
rlibs by default, but compresses it. This is both extraneous disk space
and wasted build time for almost all builds, so the PR in question there
is changing rustc to have a `-Cembed-bitcode` flag which, when enabled,
places the bitcode in the object file rather than an auxiliary file (no
extra compression), but also enables `-Cembed-bitcode=no` to disable
bitcode emission entirely.

This Cargo support changes Cargo to pass `-Cembed-bitcode=no` for almost
all compilations. Cargo will keep `lto = true` and such working by not
passing this flag (and thus allowing bitcode to get embedded), but by
default `cargo build` and `cargo build --release` will no longer have
any bitcode in rlibs which should result in speedier builds!

Most of the changes here were around the test suite and various
assertions about the `rustc` command lines we spit out. One test was
hard-disabled until we can get `-Cembed-bitcode=no` into nightly, and
then we can make it a nightly-only test. The test will then be stable
again once `-Cembed-bitcode=no` hits stable.

Note that this is intended to land before the upstream `-Cembed-bitcode`
change. The thinking is that we'll land everything in rust-lang/rust all
at once so there's no build time regressions for anyone. If we were to
land the `-Cembed-bitcode` PR first then there would be a build time
regression until we land Cargo changes because rustc would be emitting
uncompressed bitcode by default and Cargo wouldn't be turning it off.
2020-04-01 14:31:06 -07:00

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//! Tests for fingerprinting (rebuild detection).
use filetime::FileTime;
use std::fs::{self, File, OpenOptions};
use std::io;
use std::io::prelude::*;
use std::net::TcpListener;
use std::path::{Path, PathBuf};
use std::thread;
use std::time::SystemTime;
use cargo_test_support::paths::{self, CargoPathExt};
use cargo_test_support::registry::Package;
use cargo_test_support::sleep_ms;
use cargo_test_support::{basic_manifest, is_coarse_mtime, project};
#[cargo_test]
fn modifying_and_moving() {
let p = project()
.file("src/main.rs", "mod a; fn main() {}")
.file("src/a.rs", "")
.build();
p.cargo("build")
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([CWD])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
p.cargo("build").with_stdout("").run();
p.root().move_into_the_past();
p.root().join("target").move_into_the_past();
File::create(&p.root().join("src/a.rs"))
.unwrap()
.write_all(b"#[allow(unused)]fn main() {}")
.unwrap();
p.cargo("build")
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([CWD])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
fs::rename(&p.root().join("src/a.rs"), &p.root().join("src/b.rs")).unwrap();
p.cargo("build")
.with_status(101)
.with_stderr_contains("[..]file not found[..]")
.run();
}
#[cargo_test]
fn modify_only_some_files() {
let p = project()
.file("src/lib.rs", "mod a;")
.file("src/a.rs", "")
.file("src/main.rs", "mod b; fn main() {}")
.file("src/b.rs", "")
.file("tests/test.rs", "")
.build();
p.cargo("build")
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([CWD])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
p.cargo("test").run();
sleep_ms(1000);
assert!(p.bin("foo").is_file());
let lib = p.root().join("src/lib.rs");
let bin = p.root().join("src/b.rs");
File::create(&lib)
.unwrap()
.write_all(b"invalid rust code")
.unwrap();
File::create(&bin)
.unwrap()
.write_all(b"#[allow(unused)]fn foo() {}")
.unwrap();
lib.move_into_the_past();
// Make sure the binary is rebuilt, not the lib
p.cargo("build")
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([CWD])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
assert!(p.bin("foo").is_file());
}
#[cargo_test]
fn rebuild_sub_package_then_while_package() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
authors = []
version = "0.0.1"
[dependencies.a]
path = "a"
[dependencies.b]
path = "b"
"#,
)
.file("src/lib.rs", "extern crate a; extern crate b;")
.file(
"a/Cargo.toml",
r#"
[package]
name = "a"
authors = []
version = "0.0.1"
[dependencies.b]
path = "../b"
"#,
)
.file("a/src/lib.rs", "extern crate b;")
.file("b/Cargo.toml", &basic_manifest("b", "0.0.1"))
.file("b/src/lib.rs", "")
.build();
p.cargo("build")
.with_stderr(
"\
[COMPILING] b [..]
[COMPILING] a [..]
[COMPILING] foo [..]
[FINISHED] dev [..]
",
)
.run();
if is_coarse_mtime() {
sleep_ms(1000);
}
p.change_file("b/src/lib.rs", "pub fn b() {}");
p.cargo("build -pb -v")
.with_stderr(
"\
[COMPILING] b [..]
[RUNNING] `rustc --crate-name b [..]
[FINISHED] dev [..]
",
)
.run();
p.change_file(
"src/lib.rs",
"extern crate a; extern crate b; pub fn toplevel() {}",
);
p.cargo("build -v")
.with_stderr(
"\
[FRESH] b [..]
[COMPILING] a [..]
[RUNNING] `rustc --crate-name a [..]
[COMPILING] foo [..]
[RUNNING] `rustc --crate-name foo [..]
[FINISHED] dev [..]
",
)
.run();
}
#[cargo_test]
fn changing_lib_features_caches_targets() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
authors = []
version = "0.0.1"
[features]
foo = []
"#,
)
.file("src/lib.rs", "")
.build();
p.cargo("build")
.with_stderr(
"\
[..]Compiling foo v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
p.cargo("build --features foo")
.with_stderr(
"\
[..]Compiling foo v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
/* Targets should be cached from the first build */
p.cargo("build")
.with_stderr("[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]")
.run();
p.cargo("build").with_stdout("").run();
p.cargo("build --features foo")
.with_stderr("[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]")
.run();
}
#[cargo_test]
fn changing_profiles_caches_targets() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
authors = []
version = "0.0.1"
[profile.dev]
panic = "abort"
"#,
)
.file("src/lib.rs", "")
.build();
p.cargo("build")
.with_stderr(
"\
[..]Compiling foo v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
p.cargo("test")
.with_stderr(
"\
[..]Compiling foo v0.0.1 ([..])
[FINISHED] test [unoptimized + debuginfo] target(s) in [..]
[RUNNING] target[..]debug[..]deps[..]foo-[..][EXE]
[DOCTEST] foo
",
)
.run();
/* Targets should be cached from the first build */
p.cargo("build")
.with_stderr("[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]")
.run();
p.cargo("test foo")
.with_stderr(
"\
[FINISHED] test [unoptimized + debuginfo] target(s) in [..]
[RUNNING] target[..]debug[..]deps[..]foo-[..][EXE]
",
)
.run();
}
#[cargo_test]
fn changing_bin_paths_common_target_features_caches_targets() {
// Make sure dep_cache crate is built once per feature
let p = project()
.no_manifest()
.file(
".cargo/config",
r#"
[build]
target-dir = "./target"
"#,
)
.file(
"dep_crate/Cargo.toml",
r#"
[package]
name = "dep_crate"
version = "0.0.1"
authors = []
[features]
ftest = []
"#,
)
.file(
"dep_crate/src/lib.rs",
r#"
#[cfg(feature = "ftest")]
pub fn yo() {
println!("ftest on")
}
#[cfg(not(feature = "ftest"))]
pub fn yo() {
println!("ftest off")
}
"#,
)
.file(
"a/Cargo.toml",
r#"
[package]
name = "a"
version = "0.0.1"
authors = []
[dependencies]
dep_crate = {path = "../dep_crate", features = []}
"#,
)
.file("a/src/lib.rs", "")
.file(
"a/src/main.rs",
r#"
extern crate dep_crate;
use dep_crate::yo;
fn main() {
yo();
}
"#,
)
.file(
"b/Cargo.toml",
r#"
[package]
name = "b"
version = "0.0.1"
authors = []
[dependencies]
dep_crate = {path = "../dep_crate", features = ["ftest"]}
"#,
)
.file("b/src/lib.rs", "")
.file(
"b/src/main.rs",
r#"
extern crate dep_crate;
use dep_crate::yo;
fn main() {
yo();
}
"#,
)
.build();
/* Build and rebuild a/. Ensure dep_crate only builds once */
p.cargo("run")
.cwd("a")
.with_stdout("ftest off")
.with_stderr(
"\
[..]Compiling dep_crate v0.0.1 ([..])
[..]Compiling a v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
[RUNNING] `[..]target/debug/a[EXE]`
",
)
.run();
p.cargo("clean -p a").cwd("a").run();
p.cargo("run")
.cwd("a")
.with_stdout("ftest off")
.with_stderr(
"\
[..]Compiling a v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
[RUNNING] `[..]target/debug/a[EXE]`
",
)
.run();
/* Build and rebuild b/. Ensure dep_crate only builds once */
p.cargo("run")
.cwd("b")
.with_stdout("ftest on")
.with_stderr(
"\
[..]Compiling dep_crate v0.0.1 ([..])
[..]Compiling b v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
[RUNNING] `[..]target/debug/b[EXE]`
",
)
.run();
p.cargo("clean -p b").cwd("b").run();
p.cargo("run")
.cwd("b")
.with_stdout("ftest on")
.with_stderr(
"\
[..]Compiling b v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
[RUNNING] `[..]target/debug/b[EXE]`
",
)
.run();
/* Build a/ package again. If we cache different feature dep builds correctly,
* this should not cause a rebuild of dep_crate */
p.cargo("clean -p a").cwd("a").run();
p.cargo("run")
.cwd("a")
.with_stdout("ftest off")
.with_stderr(
"\
[..]Compiling a v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
[RUNNING] `[..]target/debug/a[EXE]`
",
)
.run();
/* Build b/ package again. If we cache different feature dep builds correctly,
* this should not cause a rebuild */
p.cargo("clean -p b").cwd("b").run();
p.cargo("run")
.cwd("b")
.with_stdout("ftest on")
.with_stderr(
"\
[..]Compiling b v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
[RUNNING] `[..]target/debug/b[EXE]`
",
)
.run();
}
#[cargo_test]
fn changing_bin_features_caches_targets() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
authors = []
version = "0.0.1"
[features]
foo = []
"#,
)
.file(
"src/main.rs",
r#"
fn main() {
let msg = if cfg!(feature = "foo") { "feature on" } else { "feature off" };
println!("{}", msg);
}
"#,
)
.build();
p.cargo("build")
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
p.rename_run("foo", "off1").with_stdout("feature off").run();
p.cargo("build --features foo")
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
p.rename_run("foo", "on1").with_stdout("feature on").run();
/* Targets should be cached from the first build */
let mut e = p.cargo("build");
// MSVC does not include hash in binary filename, so it gets recompiled.
if cfg!(target_env = "msvc") {
e.with_stderr("[COMPILING] foo[..]\n[FINISHED] dev[..]");
} else {
e.with_stderr("[FINISHED] dev[..]");
}
e.run();
p.rename_run("foo", "off2").with_stdout("feature off").run();
let mut e = p.cargo("build --features foo");
if cfg!(target_env = "msvc") {
e.with_stderr("[COMPILING] foo[..]\n[FINISHED] dev[..]");
} else {
e.with_stderr("[FINISHED] dev[..]");
}
e.run();
p.rename_run("foo", "on2").with_stdout("feature on").run();
}
#[cargo_test]
fn rebuild_tests_if_lib_changes() {
let p = project()
.file("src/lib.rs", "pub fn foo() {}")
.file(
"tests/foo.rs",
r#"
extern crate foo;
#[test]
fn test() { foo::foo(); }
"#,
)
.build();
p.cargo("build").run();
p.cargo("test").run();
sleep_ms(1000);
File::create(&p.root().join("src/lib.rs")).unwrap();
p.cargo("build -v").run();
p.cargo("test -v")
.with_status(101)
.with_stderr_contains("[..]cannot find function `foo`[..]")
.run();
}
#[cargo_test]
fn no_rebuild_transitive_target_deps() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
authors = []
[dependencies]
a = { path = "a" }
[dev-dependencies]
b = { path = "b" }
"#,
)
.file("src/lib.rs", "")
.file("tests/foo.rs", "")
.file(
"a/Cargo.toml",
r#"
[package]
name = "a"
version = "0.0.1"
authors = []
[target.foo.dependencies]
c = { path = "../c" }
"#,
)
.file("a/src/lib.rs", "")
.file(
"b/Cargo.toml",
r#"
[package]
name = "b"
version = "0.0.1"
authors = []
[dependencies]
c = { path = "../c" }
"#,
)
.file("b/src/lib.rs", "")
.file("c/Cargo.toml", &basic_manifest("c", "0.0.1"))
.file("c/src/lib.rs", "")
.build();
p.cargo("build").run();
p.cargo("test --no-run")
.with_stderr(
"\
[COMPILING] c v0.0.1 ([..])
[COMPILING] b v0.0.1 ([..])
[COMPILING] foo v0.0.1 ([..])
[FINISHED] test [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
}
#[cargo_test]
fn rerun_if_changed_in_dep() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
authors = []
[dependencies]
a = { path = "a" }
"#,
)
.file("src/lib.rs", "")
.file(
"a/Cargo.toml",
r#"
[package]
name = "a"
version = "0.0.1"
authors = []
build = "build.rs"
"#,
)
.file(
"a/build.rs",
r#"
fn main() {
println!("cargo:rerun-if-changed=build.rs");
}
"#,
)
.file("a/src/lib.rs", "")
.build();
p.cargo("build").run();
p.cargo("build").with_stdout("").run();
}
#[cargo_test]
fn same_build_dir_cached_packages() {
let p = project()
.no_manifest()
.file(
"a1/Cargo.toml",
r#"
[package]
name = "a1"
version = "0.0.1"
authors = []
[dependencies]
b = { path = "../b" }
"#,
)
.file("a1/src/lib.rs", "")
.file(
"a2/Cargo.toml",
r#"
[package]
name = "a2"
version = "0.0.1"
authors = []
[dependencies]
b = { path = "../b" }
"#,
)
.file("a2/src/lib.rs", "")
.file(
"b/Cargo.toml",
r#"
[package]
name = "b"
version = "0.0.1"
authors = []
[dependencies]
c = { path = "../c" }
"#,
)
.file("b/src/lib.rs", "")
.file(
"c/Cargo.toml",
r#"
[package]
name = "c"
version = "0.0.1"
authors = []
[dependencies]
d = { path = "../d" }
"#,
)
.file("c/src/lib.rs", "")
.file("d/Cargo.toml", &basic_manifest("d", "0.0.1"))
.file("d/src/lib.rs", "")
.file(
".cargo/config",
r#"
[build]
target-dir = "./target"
"#,
)
.build();
p.cargo("build")
.cwd("a1")
.with_stderr(&format!(
"\
[COMPILING] d v0.0.1 ({dir}/d)
[COMPILING] c v0.0.1 ({dir}/c)
[COMPILING] b v0.0.1 ({dir}/b)
[COMPILING] a1 v0.0.1 ([CWD])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
dir = p.url().to_file_path().unwrap().to_str().unwrap()
))
.run();
p.cargo("build")
.cwd("a2")
.with_stderr(
"\
[COMPILING] a2 v0.0.1 ([CWD])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
}
#[cargo_test]
fn no_rebuild_if_build_artifacts_move_backwards_in_time() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
authors = []
[dependencies]
a = { path = "a" }
"#,
)
.file("src/lib.rs", "")
.file("a/Cargo.toml", &basic_manifest("a", "0.0.1"))
.file("a/src/lib.rs", "")
.build();
p.cargo("build").run();
p.root().move_into_the_past();
p.cargo("build")
.with_stdout("")
.with_stderr("[FINISHED] [..]")
.run();
}
#[cargo_test]
fn rebuild_if_build_artifacts_move_forward_in_time() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
authors = []
[dependencies]
a = { path = "a" }
"#,
)
.file("src/lib.rs", "")
.file("a/Cargo.toml", &basic_manifest("a", "0.0.1"))
.file("a/src/lib.rs", "")
.build();
p.cargo("build").run();
p.root().move_into_the_future();
p.cargo("build")
.env("CARGO_LOG", "")
.with_stdout("")
.with_stderr(
"\
[COMPILING] a v0.0.1 ([..])
[COMPILING] foo v0.0.1 ([..])
[FINISHED] [..]
",
)
.run();
}
#[cargo_test]
fn rebuild_if_environment_changes() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
description = "old desc"
version = "0.0.1"
authors = []
"#,
)
.file(
"src/main.rs",
r#"
fn main() {
println!("{}", env!("CARGO_PKG_DESCRIPTION"));
}
"#,
)
.build();
p.cargo("run")
.with_stdout("old desc")
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([CWD])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
[RUNNING] `target/debug/foo[EXE]`
",
)
.run();
File::create(&p.root().join("Cargo.toml"))
.unwrap()
.write_all(
br#"
[package]
name = "foo"
description = "new desc"
version = "0.0.1"
authors = []
"#,
)
.unwrap();
p.cargo("run")
.with_stdout("new desc")
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([CWD])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
[RUNNING] `target/debug/foo[EXE]`
",
)
.run();
}
#[cargo_test]
fn no_rebuild_when_rename_dir() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "bar"
version = "0.0.1"
authors = []
[dependencies]
foo = { path = "foo" }
"#,
)
.file("src/lib.rs", "")
.file("foo/Cargo.toml", &basic_manifest("foo", "0.0.1"))
.file("foo/src/lib.rs", "")
.build();
p.cargo("build").run();
let mut new = p.root();
new.pop();
new.push("bar");
fs::rename(p.root(), &new).unwrap();
p.cargo("build")
.cwd(&new)
.with_stderr("[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]")
.run();
}
#[cargo_test]
fn unused_optional_dep() {
Package::new("registry1", "0.1.0").publish();
Package::new("registry2", "0.1.0").publish();
Package::new("registry3", "0.1.0").publish();
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "p"
authors = []
version = "0.1.0"
[dependencies]
bar = { path = "bar" }
baz = { path = "baz" }
registry1 = "*"
"#,
)
.file("src/lib.rs", "")
.file(
"bar/Cargo.toml",
r#"
[package]
name = "bar"
version = "0.1.1"
authors = []
[dev-dependencies]
registry2 = "*"
"#,
)
.file("bar/src/lib.rs", "")
.file(
"baz/Cargo.toml",
r#"
[package]
name = "baz"
version = "0.1.1"
authors = []
[dependencies]
registry3 = { version = "*", optional = true }
"#,
)
.file("baz/src/lib.rs", "")
.build();
p.cargo("build").run();
p.cargo("build").with_stderr("[FINISHED] [..]").run();
}
#[cargo_test]
fn path_dev_dep_registry_updates() {
Package::new("registry1", "0.1.0").publish();
Package::new("registry2", "0.1.0").publish();
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "p"
authors = []
version = "0.1.0"
[dependencies]
bar = { path = "bar" }
"#,
)
.file("src/lib.rs", "")
.file(
"bar/Cargo.toml",
r#"
[package]
name = "bar"
version = "0.1.1"
authors = []
[dependencies]
registry1 = "*"
[dev-dependencies]
baz = { path = "../baz"}
"#,
)
.file("bar/src/lib.rs", "")
.file(
"baz/Cargo.toml",
r#"
[package]
name = "baz"
version = "0.1.1"
authors = []
[dependencies]
registry2 = "*"
"#,
)
.file("baz/src/lib.rs", "")
.build();
p.cargo("build").run();
p.cargo("build").with_stderr("[FINISHED] [..]").run();
}
#[cargo_test]
fn change_panic_mode() {
let p = project()
.file(
"Cargo.toml",
r#"
[workspace]
members = ['bar', 'baz']
[profile.dev]
panic = 'abort'
"#,
)
.file("src/lib.rs", "")
.file("bar/Cargo.toml", &basic_manifest("bar", "0.1.1"))
.file("bar/src/lib.rs", "")
.file(
"baz/Cargo.toml",
r#"
[package]
name = "baz"
version = "0.1.1"
authors = []
[lib]
proc-macro = true
[dependencies]
bar = { path = '../bar' }
"#,
)
.file("baz/src/lib.rs", "extern crate bar;")
.build();
p.cargo("build -p bar").run();
p.cargo("build -p baz").run();
}
#[cargo_test]
fn dont_rebuild_based_on_plugins() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "bar"
version = "0.1.1"
[workspace]
members = ['baz']
[dependencies]
proc-macro-thing = { path = 'proc-macro-thing' }
"#,
)
.file("src/lib.rs", "")
.file(
"proc-macro-thing/Cargo.toml",
r#"
[package]
name = "proc-macro-thing"
version = "0.1.1"
[lib]
proc-macro = true
[dependencies]
qux = { path = '../qux' }
"#,
)
.file("proc-macro-thing/src/lib.rs", "")
.file(
"baz/Cargo.toml",
r#"
[package]
name = "baz"
version = "0.1.1"
[dependencies]
qux = { path = '../qux' }
"#,
)
.file("baz/src/main.rs", "fn main() {}")
.file("qux/Cargo.toml", &basic_manifest("qux", "0.1.1"))
.file("qux/src/lib.rs", "")
.build();
p.cargo("build").run();
p.cargo("build -p baz").run();
p.cargo("build").with_stderr("[FINISHED] [..]\n").run();
p.cargo("build -p bar")
.with_stderr("[FINISHED] [..]\n")
.run();
}
#[cargo_test]
fn reuse_workspace_lib() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "bar"
version = "0.1.1"
[workspace]
[dependencies]
baz = { path = 'baz' }
"#,
)
.file("src/lib.rs", "")
.file("baz/Cargo.toml", &basic_manifest("baz", "0.1.1"))
.file("baz/src/lib.rs", "")
.build();
p.cargo("build").run();
p.cargo("test -p baz -v --no-run")
.with_stderr(
"\
[COMPILING] baz v0.1.1 ([..])
[RUNNING] `rustc[..] --test [..]`
[FINISHED] [..]
",
)
.run();
}
#[cargo_test]
fn reuse_shared_build_dep() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
[dependencies]
shared = {path = "shared"}
[workspace]
members = ["shared", "bar"]
"#,
)
.file("src/main.rs", "fn main() {}")
.file("shared/Cargo.toml", &basic_manifest("shared", "0.0.1"))
.file("shared/src/lib.rs", "")
.file(
"bar/Cargo.toml",
r#"
[package]
name = "bar"
version = "0.0.1"
[build-dependencies]
shared = { path = "../shared" }
"#,
)
.file("bar/src/lib.rs", "")
.file("bar/build.rs", "fn main() {}")
.build();
p.cargo("build --workspace").run();
// This should not recompile!
p.cargo("build -p foo -v")
.with_stderr(
"\
[FRESH] shared [..]
[FRESH] foo [..]
[FINISHED] [..]
",
)
.run();
}
#[cargo_test]
fn changing_rustflags_is_cached() {
let p = project().file("src/lib.rs", "").build();
// This isn't ever cached, we always have to recompile
for _ in 0..2 {
p.cargo("build")
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]",
)
.run();
p.cargo("build")
.env("RUSTFLAGS", "-C linker=cc")
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]",
)
.run();
}
}
#[cargo_test]
fn update_dependency_mtime_does_not_rebuild() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
[dependencies]
bar = { path = "bar" }
"#,
)
.file("src/lib.rs", "")
.file("bar/Cargo.toml", &basic_manifest("bar", "0.0.1"))
.file("bar/src/lib.rs", "")
.build();
p.cargo("build -Z mtime-on-use")
.masquerade_as_nightly_cargo()
.env("RUSTFLAGS", "-C linker=cc")
.with_stderr(
"\
[COMPILING] bar v0.0.1 ([..])
[COMPILING] foo v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]",
)
.run();
// This does not make new files, but it does update the mtime of the dependency.
p.cargo("build -p bar -Z mtime-on-use")
.masquerade_as_nightly_cargo()
.env("RUSTFLAGS", "-C linker=cc")
.with_stderr("[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]")
.run();
// This should not recompile!
p.cargo("build -Z mtime-on-use")
.masquerade_as_nightly_cargo()
.env("RUSTFLAGS", "-C linker=cc")
.with_stderr("[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]")
.run();
}
fn fingerprint_cleaner(mut dir: PathBuf, timestamp: filetime::FileTime) {
// Cargo is experimenting with letting outside projects develop some
// limited forms of GC for target_dir. This is one of the forms.
// Specifically, Cargo is updating the mtime of a file in
// target/profile/.fingerprint each time it uses the fingerprint.
// So a cleaner can remove files associated with a fingerprint
// if all the files in the fingerprint's folder are older then a time stamp without
// effecting any builds that happened since that time stamp.
let mut cleand = false;
dir.push(".fingerprint");
for fing in fs::read_dir(&dir).unwrap() {
let fing = fing.unwrap();
let outdated = |f: io::Result<fs::DirEntry>| {
filetime::FileTime::from_last_modification_time(&f.unwrap().metadata().unwrap())
<= timestamp
};
if fs::read_dir(fing.path()).unwrap().all(outdated) {
fs::remove_dir_all(fing.path()).unwrap();
println!("remove: {:?}", fing.path());
// a real cleaner would remove the big files in deps and build as well
// but fingerprint is sufficient for our tests
cleand = true;
} else {
}
}
assert!(
cleand,
"called fingerprint_cleaner, but there was nothing to remove"
);
}
#[cargo_test]
fn fingerprint_cleaner_does_not_rebuild() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
[dependencies]
bar = { path = "bar" }
[features]
a = []
"#,
)
.file("src/lib.rs", "")
.file("bar/Cargo.toml", &basic_manifest("bar", "0.0.1"))
.file("bar/src/lib.rs", "")
.build();
p.cargo("build -Z mtime-on-use")
.masquerade_as_nightly_cargo()
.run();
p.cargo("build -Z mtime-on-use --features a")
.masquerade_as_nightly_cargo()
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]",
)
.run();
if is_coarse_mtime() {
sleep_ms(1000);
}
let timestamp = filetime::FileTime::from_system_time(SystemTime::now());
if is_coarse_mtime() {
sleep_ms(1000);
}
// This does not make new files, but it does update the mtime.
p.cargo("build -Z mtime-on-use --features a")
.masquerade_as_nightly_cargo()
.with_stderr("[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]")
.run();
fingerprint_cleaner(p.target_debug_dir(), timestamp);
// This should not recompile!
p.cargo("build -Z mtime-on-use --features a")
.masquerade_as_nightly_cargo()
.with_stderr("[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]")
.run();
// But this should be cleaned and so need a rebuild
p.cargo("build -Z mtime-on-use")
.masquerade_as_nightly_cargo()
.with_stderr(
"\
[COMPILING] foo v0.0.1 ([..])
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]",
)
.run();
}
#[cargo_test]
fn reuse_panic_build_dep_test() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
[build-dependencies]
bar = { path = "bar" }
[dev-dependencies]
bar = { path = "bar" }
[profile.dev]
panic = "abort"
"#,
)
.file("src/lib.rs", "")
.file("build.rs", "fn main() {}")
.file("bar/Cargo.toml", &basic_manifest("bar", "0.0.1"))
.file("bar/src/lib.rs", "")
.build();
// Check that `bar` is not built twice. It is only needed once (without `panic`).
p.cargo("test --lib --no-run -v")
.with_stderr(
"\
[COMPILING] bar [..]
[RUNNING] `rustc --crate-name bar [..]
[COMPILING] foo [..]
[RUNNING] `rustc --crate-name build_script_build [..]
[RUNNING] [..]build-script-build`
[RUNNING] `rustc --crate-name foo src/lib.rs [..]--test[..]
[FINISHED] [..]
",
)
.run();
}
#[cargo_test]
fn reuse_panic_pm() {
// foo(panic) -> bar(panic)
// somepm(nopanic) -> bar(nopanic)
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
[dependencies]
bar = { path = "bar" }
somepm = { path = "somepm" }
[profile.dev]
panic = "abort"
"#,
)
.file("src/lib.rs", "extern crate bar;")
.file("bar/Cargo.toml", &basic_manifest("bar", "0.0.1"))
.file("bar/src/lib.rs", "")
.file(
"somepm/Cargo.toml",
r#"
[package]
name = "somepm"
version = "0.0.1"
[lib]
proc-macro = true
[dependencies]
bar = { path = "../bar" }
"#,
)
.file("somepm/src/lib.rs", "extern crate bar;")
.build();
// bar is built once without panic (for proc-macro) and once with (for the
// normal dependency).
p.cargo("build -v")
.with_stderr_unordered(
"\
[COMPILING] bar [..]
[RUNNING] `rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C debuginfo=2 [..]
[RUNNING] `rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C debuginfo=2 [..]
[COMPILING] somepm [..]
[RUNNING] `rustc --crate-name somepm [..]
[COMPILING] foo [..]
[RUNNING] `rustc --crate-name foo src/lib.rs [..]-C panic=abort[..]
[FINISHED] [..]
",
)
.run();
}
#[cargo_test]
fn bust_patched_dep() {
Package::new("registry1", "0.1.0").publish();
Package::new("registry2", "0.1.0")
.dep("registry1", "0.1.0")
.publish();
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
[dependencies]
registry2 = "0.1.0"
[patch.crates-io]
registry1 = { path = "reg1new" }
"#,
)
.file("src/lib.rs", "")
.file("reg1new/Cargo.toml", &basic_manifest("registry1", "0.1.0"))
.file("reg1new/src/lib.rs", "")
.build();
p.cargo("build").run();
if is_coarse_mtime() {
sleep_ms(1000);
}
File::create(&p.root().join("reg1new/src/lib.rs")).unwrap();
if is_coarse_mtime() {
sleep_ms(1000);
}
p.cargo("build")
.with_stderr(
"\
[COMPILING] registry1 v0.1.0 ([..])
[COMPILING] registry2 v0.1.0
[COMPILING] foo v0.0.1 ([..])
[FINISHED] [..]
",
)
.run();
p.cargo("build -v")
.with_stderr(
"\
[FRESH] registry1 v0.1.0 ([..])
[FRESH] registry2 v0.1.0
[FRESH] foo v0.0.1 ([..])
[FINISHED] [..]
",
)
.run();
}
#[cargo_test]
fn rebuild_on_mid_build_file_modification() {
let server = TcpListener::bind("127.0.0.1:0").unwrap();
let addr = server.local_addr().unwrap();
let p = project()
.file(
"Cargo.toml",
r#"
[workspace]
members = ["root", "proc_macro_dep"]
"#,
)
.file(
"root/Cargo.toml",
r#"
[package]
name = "root"
version = "0.1.0"
authors = []
[dependencies]
proc_macro_dep = { path = "../proc_macro_dep" }
"#,
)
.file(
"root/src/lib.rs",
r#"
#[macro_use]
extern crate proc_macro_dep;
#[derive(Noop)]
pub struct X;
"#,
)
.file(
"proc_macro_dep/Cargo.toml",
r#"
[package]
name = "proc_macro_dep"
version = "0.1.0"
authors = []
[lib]
proc-macro = true
"#,
)
.file(
"proc_macro_dep/src/lib.rs",
&format!(
r#"
extern crate proc_macro;
use std::io::Read;
use std::net::TcpStream;
use proc_macro::TokenStream;
#[proc_macro_derive(Noop)]
pub fn noop(_input: TokenStream) -> TokenStream {{
let mut stream = TcpStream::connect("{}").unwrap();
let mut v = Vec::new();
stream.read_to_end(&mut v).unwrap();
"".parse().unwrap()
}}
"#,
addr
),
)
.build();
let root = p.root();
let t = thread::spawn(move || {
let socket = server.accept().unwrap().0;
sleep_ms(1000);
let mut file = OpenOptions::new()
.write(true)
.append(true)
.open(root.join("root/src/lib.rs"))
.unwrap();
writeln!(file, "// modified").expect("Failed to append to root sources");
drop(file);
drop(socket);
drop(server.accept().unwrap());
});
p.cargo("build")
.with_stderr(
"\
[COMPILING] proc_macro_dep v0.1.0 ([..]/proc_macro_dep)
[COMPILING] root v0.1.0 ([..]/root)
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
p.cargo("build")
.with_stderr(
"\
[COMPILING] root v0.1.0 ([..]/root)
[FINISHED] dev [unoptimized + debuginfo] target(s) in [..]
",
)
.run();
t.join().ok().unwrap();
}
#[cargo_test]
fn dirty_both_lib_and_test() {
// This tests that all artifacts that depend on the results of a build
// script will get rebuilt when the build script reruns, even for separate
// commands. It does the following:
//
// 1. Project "foo" has a build script which will compile a small
// staticlib to link against. Normally this would use the `cc` crate,
// but here we just use rustc to avoid the `cc` dependency.
// 2. Build the library.
// 3. Build the unit test. The staticlib intentionally has a bad value.
// 4. Rewrite the staticlib with the correct value.
// 5. Build the library again.
// 6. Build the unit test. This should recompile.
let slib = |n| {
format!(
r#"
#[no_mangle]
pub extern "C" fn doit() -> i32 {{
return {};
}}
"#,
n
)
};
let p = project()
.file(
"src/lib.rs",
r#"
extern "C" {
fn doit() -> i32;
}
#[test]
fn t1() {
assert_eq!(unsafe { doit() }, 1, "doit assert failure");
}
"#,
)
.file(
"build.rs",
r#"
use std::env;
use std::path::PathBuf;
use std::process::Command;
fn main() {
let rustc = env::var_os("RUSTC").unwrap();
let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
assert!(
Command::new(rustc)
.args(&[
"--crate-type=staticlib",
"--out-dir",
out_dir.to_str().unwrap(),
"slib.rs"
])
.status()
.unwrap()
.success(),
"slib build failed"
);
println!("cargo:rustc-link-lib=slib");
println!("cargo:rustc-link-search={}", out_dir.display());
}
"#,
)
.file("slib.rs", &slib(2))
.build();
p.cargo("build").run();
// 2 != 1
p.cargo("test --lib")
.with_status(101)
.with_stdout_contains("[..]doit assert failure[..]")
.run();
if is_coarse_mtime() {
// #5918
sleep_ms(1000);
}
// Fix the mistake.
p.change_file("slib.rs", &slib(1));
p.cargo("build").run();
// This should recompile with the new static lib, and the test should pass.
p.cargo("test --lib").run();
}
#[cargo_test]
fn script_fails_stay_dirty() {
// Check if a script is aborted (such as hitting Ctrl-C) that it will re-run.
// Steps:
// 1. Build to establish fingerprints.
// 2. Make a change that triggers the build script to re-run. Abort the
// script while it is running.
// 3. Run the build again and make sure it re-runs the script.
let p = project()
.file(
"build.rs",
r#"
mod helper;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
helper::doit();
}
"#,
)
.file("helper.rs", "pub fn doit() {}")
.file("src/lib.rs", "")
.build();
p.cargo("build").run();
if is_coarse_mtime() {
sleep_ms(1000);
}
p.change_file("helper.rs", r#"pub fn doit() {panic!("Crash!");}"#);
p.cargo("build")
.with_stderr_contains("[..]Crash![..]")
.with_status(101)
.run();
// There was a bug where this second call would be "fresh".
p.cargo("build")
.with_stderr_contains("[..]Crash![..]")
.with_status(101)
.run();
}
#[cargo_test]
fn simulated_docker_deps_stay_cached() {
// Test what happens in docker where the nanoseconds are zeroed out.
Package::new("regdep", "1.0.0").publish();
Package::new("regdep_old_style", "1.0.0")
.file("build.rs", "fn main() {}")
.file("src/lib.rs", "")
.publish();
Package::new("regdep_env", "1.0.0")
.file(
"build.rs",
r#"
fn main() {
println!("cargo:rerun-if-env-changed=SOMEVAR");
}
"#,
)
.file("src/lib.rs", "")
.publish();
Package::new("regdep_rerun", "1.0.0")
.file(
"build.rs",
r#"
fn main() {
println!("cargo:rerun-if-changed=build.rs");
}
"#,
)
.file("src/lib.rs", "")
.publish();
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.1.0"
[dependencies]
pathdep = { path = "pathdep" }
regdep = "1.0"
regdep_old_style = "1.0"
regdep_env = "1.0"
regdep_rerun = "1.0"
"#,
)
.file(
"src/lib.rs",
"
extern crate pathdep;
extern crate regdep;
extern crate regdep_old_style;
extern crate regdep_env;
extern crate regdep_rerun;
",
)
.file("build.rs", "fn main() {}")
.file("pathdep/Cargo.toml", &basic_manifest("pathdep", "1.0.0"))
.file("pathdep/src/lib.rs", "")
.build();
p.cargo("build").run();
let already_zero = {
// This happens on HFS with 1-second timestamp resolution,
// or other filesystems where it just so happens to write exactly on a
// 1-second boundary.
let metadata = fs::metadata(p.root().join("src/lib.rs")).unwrap();
let mtime = FileTime::from_last_modification_time(&metadata);
mtime.nanoseconds() == 0
};
// Recursively remove `nanoseconds` from every path.
fn zeropath(path: &Path) {
for entry in walkdir::WalkDir::new(path)
.into_iter()
.filter_map(|e| e.ok())
{
let metadata = fs::metadata(entry.path()).unwrap();
let mtime = metadata.modified().unwrap();
let mtime_duration = mtime.duration_since(SystemTime::UNIX_EPOCH).unwrap();
let trunc_mtime = FileTime::from_unix_time(mtime_duration.as_secs() as i64, 0);
let atime = metadata.accessed().unwrap();
let atime_duration = atime.duration_since(SystemTime::UNIX_EPOCH).unwrap();
let trunc_atime = FileTime::from_unix_time(atime_duration.as_secs() as i64, 0);
if let Err(e) = filetime::set_file_times(entry.path(), trunc_atime, trunc_mtime) {
// Windows doesn't allow changing filetimes on some things
// (directories, other random things I'm not sure why). Just
// ignore them.
if e.kind() == std::io::ErrorKind::PermissionDenied {
println!("PermissionDenied filetime on {:?}", entry.path());
} else {
panic!("FileTime error on {:?}: {:?}", entry.path(), e);
}
}
}
}
zeropath(&p.root());
zeropath(&paths::home());
if already_zero {
println!("already zero");
// If it was already truncated, then everything stays fresh.
p.cargo("build -v")
.with_stderr_unordered(
"\
[FRESH] pathdep [..]
[FRESH] regdep [..]
[FRESH] regdep_env [..]
[FRESH] regdep_old_style [..]
[FRESH] regdep_rerun [..]
[FRESH] foo [..]
[FINISHED] [..]
",
)
.run();
} else {
println!("not already zero");
// It is not ideal that `foo` gets recompiled, but that is the current
// behavior. Currently mtimes are ignored for registry deps.
//
// Note that this behavior is due to the fact that `foo` has a build
// script in "old" mode where it doesn't print `rerun-if-*`. In this
// mode we use `Precalculated` to fingerprint a path dependency, where
// `Precalculated` is an opaque string which has the most recent mtime
// in it. It differs between builds because one has nsec=0 and the other
// likely has a nonzero nsec. Hence, the rebuild.
p.cargo("build -v")
.with_stderr_unordered(
"\
[FRESH] pathdep [..]
[FRESH] regdep [..]
[FRESH] regdep_env [..]
[FRESH] regdep_old_style [..]
[FRESH] regdep_rerun [..]
[COMPILING] foo [..]
[RUNNING] [..]/foo-[..]/build-script-build[..]
[RUNNING] `rustc --crate-name foo[..]
[FINISHED] [..]
",
)
.run();
}
}
#[cargo_test]
fn metadata_change_invalidates() {
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.1.0"
"#,
)
.file("src/lib.rs", "")
.build();
p.cargo("build").run();
for attr in &[
"authors = [\"foo\"]",
"description = \"desc\"",
"homepage = \"https://example.com\"",
"repository =\"https://example.com\"",
] {
let mut file = OpenOptions::new()
.write(true)
.append(true)
.open(p.root().join("Cargo.toml"))
.unwrap();
writeln!(file, "{}", attr).unwrap();
p.cargo("build")
.with_stderr_contains("[COMPILING] foo [..]")
.run();
}
p.cargo("build -v")
.with_stderr_contains("[FRESH] foo[..]")
.run();
assert_eq!(p.glob("target/debug/deps/libfoo-*.rlib").count(), 1);
}
#[cargo_test]
fn edition_change_invalidates() {
const MANIFEST: &str = r#"
[package]
name = "foo"
version = "0.1.0"
"#;
let p = project()
.file("Cargo.toml", MANIFEST)
.file("src/lib.rs", "")
.build();
p.cargo("build").run();
p.change_file("Cargo.toml", &format!("{}edition = \"2018\"", MANIFEST));
p.cargo("build")
.with_stderr_contains("[COMPILING] foo [..]")
.run();
p.change_file(
"Cargo.toml",
&format!(
r#"{}edition = "2018"
[lib]
edition = "2015"
"#,
MANIFEST
),
);
p.cargo("build")
.with_stderr_contains("[COMPILING] foo [..]")
.run();
p.cargo("build -v")
.with_stderr_contains("[FRESH] foo[..]")
.run();
assert_eq!(p.glob("target/debug/deps/libfoo-*.rlib").count(), 1);
}
#[cargo_test]
fn rename_with_path_deps() {
let p = project()
.file(
"Cargo.toml",
r#"
[project]
name = "foo"
version = "0.5.0"
authors = []
[dependencies]
a = { path = 'a' }
"#,
)
.file("src/lib.rs", "extern crate a; pub fn foo() { a::foo(); }")
.file(
"a/Cargo.toml",
r#"
[project]
name = "a"
version = "0.5.0"
authors = []
[dependencies]
b = { path = 'b' }
"#,
)
.file("a/src/lib.rs", "extern crate b; pub fn foo() { b::foo() }")
.file(
"a/b/Cargo.toml",
r#"
[project]
name = "b"
version = "0.5.0"
authors = []
"#,
)
.file("a/b/src/lib.rs", "pub fn foo() { }");
let p = p.build();
p.cargo("build").run();
// Now rename the root directory and rerun `cargo run`. Not only should we
// not build anything but we also shouldn't crash.
let mut new = p.root();
new.pop();
new.push("foo2");
fs::rename(p.root(), &new).unwrap();
p.cargo("build")
.cwd(&new)
.with_stderr("[FINISHED] [..]")
.run();
}
#[cargo_test]
fn move_target_directory_with_path_deps() {
let p = project()
.file(
"Cargo.toml",
r#"
[project]
name = "foo"
version = "0.5.0"
authors = []
[dependencies]
a = { path = "a" }
"#,
)
.file(
"a/Cargo.toml",
r#"
[project]
name = "a"
version = "0.5.0"
authors = []
"#,
)
.file("src/lib.rs", "extern crate a; pub use a::print_msg;")
.file(
"a/build.rs",
r###"
use std::env;
use std::fs;
use std::path::Path;
fn main() {
println!("cargo:rerun-if-changed=build.rs");
let out_dir = env::var("OUT_DIR").unwrap();
let dest_path = Path::new(&out_dir).join("hello.rs");
fs::write(&dest_path, r#"
pub fn message() -> &'static str {
"Hello, World!"
}
"#).unwrap();
}
"###,
)
.file(
"a/src/lib.rs",
r#"
include!(concat!(env!("OUT_DIR"), "/hello.rs"));
pub fn print_msg() { message(); }
"#,
);
let p = p.build();
let mut parent = p.root();
parent.pop();
p.cargo("build").run();
let new_target = p.root().join("target2");
fs::rename(p.root().join("target"), &new_target).unwrap();
p.cargo("build")
.env("CARGO_TARGET_DIR", &new_target)
.with_stderr("[FINISHED] [..]")
.run();
}
#[cargo_test]
fn rerun_if_changes() {
let p = project()
.file(
"build.rs",
r#"
fn main() {
println!("cargo:rerun-if-env-changed=FOO");
if std::env::var("FOO").is_ok() {
println!("cargo:rerun-if-env-changed=BAR");
}
}
"#,
)
.file("src/lib.rs", "")
.build();
p.cargo("build").run();
p.cargo("build").with_stderr("[FINISHED] [..]").run();
p.cargo("build -v")
.env("FOO", "1")
.with_stderr(
"\
[COMPILING] foo [..]
[RUNNING] `[..]build-script-build`
[RUNNING] `rustc [..]
[FINISHED] [..]
",
)
.run();
p.cargo("build")
.env("FOO", "1")
.with_stderr("[FINISHED] [..]")
.run();
p.cargo("build -v")
.env("FOO", "1")
.env("BAR", "1")
.with_stderr(
"\
[COMPILING] foo [..]
[RUNNING] `[..]build-script-build`
[RUNNING] `rustc [..]
[FINISHED] [..]
",
)
.run();
p.cargo("build")
.env("FOO", "1")
.env("BAR", "1")
.with_stderr("[FINISHED] [..]")
.run();
p.cargo("build -v")
.env("BAR", "2")
.with_stderr(
"\
[COMPILING] foo [..]
[RUNNING] `[..]build-script-build`
[RUNNING] `rustc [..]
[FINISHED] [..]
",
)
.run();
p.cargo("build")
.env("BAR", "2")
.with_stderr("[FINISHED] [..]")
.run();
}
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