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Build host dependencies with opt-level 0 by default
This commit updates Cargo's build of host dependencies to build them with optimization level 0 by default instead of matching the profile of the final binary. Since Cargo's inception build dependencies have, by default, been built in a profile that largely matches the profile of the final target artifact. Build dependencies, however, rarely actually need to be optimized and are often executing very small tasks, which means that optimizing them often wastes a lot of build time. A great example of this is procedural macros where `syn` and friends are pretty heavyweight to optimize, and the amount of Rust code they're parsing is typically quite small, so the time spent optimizing rarely comes as a benefit. The goal of this PR is to improve build times on average in the community by not spending time optimizing build dependencies (build scripts, procedural macros, and their transitive dependencies). The PR will not be a universal win for everyone, however. There's some situations where your build time may actually increase: * In some cases build scripts and procedural macros can take quite a long time to run! * Cargo may not build dependencies more than once if they're shared with the main build. This only applies to builds without `--target` where the same crate is used in the final binary as in a build script. In these cases, however, the `build-override` profile has existed for some time know and allows giving a knob to tweak this behavior. For example to get back the previous build behavior of Cargo you would specify, in `Cargo.toml`: [profile.release.build-override] opt-level = 3 or you can configure this via the environment: export CARGO_PROFILE_RELEASE_BUILD_OVERRIDE_OPT_LEVEL=3 There are two notable features we would like to add in the future which would make the impact of a change like this smaller, but they're not implemented at this time (nor do we have concrete plans to implement them). First we would like crates to have a way of specifying they should be optimized by default, despite default profile options. Often crates, like lalrpop historically, have abysmal performance in debug mode and almost always (even in debug builds) want to be built in release mode. The second feature is that ideally crate authors would be able to tell Cargo to minimize the number of crates built, unifying profiles where possible to avoid double-compiling crates. At this time though the Cargo team feels that the benefit of changing the defaults is well worth this change. Neither today nor directly after this change will be a perfect world, but it's hoped that this change makes things less bad!
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5 files changed

+70
-44
lines changed

5 files changed

+70
-44
lines changed

‎crates/cargo-test-support/src/lib.rs‎

Lines changed: 14 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -1223,22 +1223,23 @@ impl Execs {
12231223
// test suite to pass for now, but we may need to get more fancy
12241224
// if tests start failing again.
12251225
a.sort_by_key(|s| s.len());
1226-
let e = out.lines();
1226+
let mut failures = Vec::new();
12271227

1228-
for e_line in e {
1228+
for e_line in out.lines() {
12291229
match a.iter().position(|a_line| lines_match(e_line, a_line)) {
1230-
Some(index) => a.remove(index),
1231-
None => {
1232-
return Err(format!(
1233-
"Did not find expected line:\n\
1234-
{}\n\
1235-
Remaining available output:\n\
1236-
{}\n",
1237-
e_line,
1238-
a.join("\n")
1239-
));
1230+
Some(index) => {
1231+
a.remove(index);
12401232
}
1241-
};
1233+
None => failures.push(e_line),
1234+
}
1235+
}
1236+
if failures.len() > 0 {
1237+
return Err(format!(
1238+
"Did not find expected line(s):\n{}\n\
1239+
Remaining available output:\n{}\n",
1240+
failures.join("\n"),
1241+
a.join("\n")
1242+
));
12421243
}
12431244
if !a.is_empty() {
12441245
Err(format!(

‎src/cargo/core/profiles.rs‎

Lines changed: 12 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -487,7 +487,18 @@ fn merge_toml_overrides(
487487
toml: &TomlProfile,
488488
) {
489489
if unit_for.is_for_host() {
490-
if let Some(ref build_override) = toml.build_override {
490+
// For-host units are things like procedural macros, build scripts, and
491+
// their dependencies. For these units most projects simply want them
492+
// to compile quickly and the runtime doesn't matter too much since
493+
// they tend to process very little data. For this reason we default
494+
// them to a "compile as quickly as possible" mode which for now means
495+
// basically turning down the optimization level and avoid limiting
496+
// codegen units. This ensures that we spend little time optimizing as
497+
// well as enabling parallelism by not constraining codegen units.
498+
profile.opt_level = InternedString::new("0");
499+
profile.codegen_units = None;
500+
501+
if let Some(build_override) = &toml.build_override {
491502
merge_profile(profile, build_override);
492503
}
493504
}

‎tests/testsuite/lto.rs‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -184,6 +184,11 @@ fn complicated() {
184184
185185
[profile.release]
186186
lto = true
187+
188+
# force build deps to share an opt-level with the rest of the
189+
# graph so they only get built once.
190+
[profile.release.build-override]
191+
opt-level = 3
187192
"#,
188193
)
189194
.file("build.rs", "fn main() { dep_build::foo() }")

‎tests/testsuite/profile_config.rs‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -419,7 +419,7 @@ fn named_config_profile() {
419419
let bo = profiles.get_profile(a_pkg, true, true, UnitFor::new_host(false), mode);
420420
assert_eq!(bo.name, "foo");
421421
assert_eq!(bo.codegen_units, Some(6)); // "foo" build override from config
422-
assert_eq!(bo.opt_level, "1"); // SAME as normal
422+
assert_eq!(bo.opt_level, "0"); // default to zero
423423
assert_eq!(bo.debuginfo, Some(1)); // SAME as normal
424424
assert_eq!(bo.debug_assertions, false); // "foo" build override from manifest
425425
assert_eq!(bo.overflow_checks, true); // SAME as normal

‎tests/testsuite/profile_targets.rs‎

Lines changed: 38 additions & 29 deletions
Original file line numberDiff line numberDiff line change
@@ -34,6 +34,10 @@ fn all_target_project() -> Project {
3434
codegen-units = 3
3535
[profile.bench]
3636
codegen-units = 4
37+
[profile.dev.build-override]
38+
codegen-units = 5
39+
[profile.release.build-override]
40+
codegen-units = 6
3741
"#,
3842
named_profiles = if is_nightly() {
3943
"\"named-profiles\", "
@@ -90,11 +94,11 @@ fn profile_selection_build() {
9094
p.cargo("build -vv").masquerade_as_nightly_cargo().with_stderr_unordered("\
9195
[COMPILING] bar [..]
9296
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
93-
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
97+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
9498
[COMPILING] bdep [..]
95-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
99+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
96100
[COMPILING] foo [..]
97-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
101+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
98102
[RUNNING] `[..]/target/debug/build/foo-[..]/build-script-build`
99103
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
100104
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
@@ -122,11 +126,11 @@ fn profile_selection_build_release() {
122126
p.cargo("build --release -vv").masquerade_as_nightly_cargo().with_stderr_unordered("\
123127
[COMPILING] bar [..]
124128
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]
125-
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
129+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
126130
[COMPILING] bdep [..]
127-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
131+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
128132
[COMPILING] foo [..]
129-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
133+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=6 [..]
130134
[RUNNING] `[..]/target/release/build/foo-[..]/build-script-build`
131135
[foo 0.0.1] foo custom build PROFILE=release DEBUG=false OPT_LEVEL=3
132136
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]
@@ -181,10 +185,11 @@ fn profile_selection_build_all_targets() {
181185
[COMPILING] bar [..]
182186
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
183187
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
188+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
184189
[COMPILING] bdep [..]
185-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
190+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
186191
[COMPILING] foo [..]
187-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
192+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
188193
[RUNNING] `[..]/target/debug/build/foo-[..]/build-script-build`
189194
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
190195
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]`
@@ -248,10 +253,11 @@ fn profile_selection_build_all_targets_release() {
248253
[COMPILING] bar [..]
249254
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
250255
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]
256+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
251257
[COMPILING] bdep [..]
252-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
258+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
253259
[COMPILING] foo [..]
254-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
260+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=6 [..]
255261
[RUNNING] `[..]/target/release/build/foo-[..]/build-script-build`
256262
[foo 0.0.1] foo custom build PROFILE=release DEBUG=false OPT_LEVEL=3
257263
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]`
@@ -305,11 +311,12 @@ fn profile_selection_test() {
305311
p.cargo("test -vv").masquerade_as_nightly_cargo().with_stderr_unordered(format!("\
306312
[COMPILING] bar [..]
307313
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
314+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
308315
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units={affected} -C debuginfo=2 [..]
309316
[COMPILING] bdep [..]
310-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
317+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
311318
[COMPILING] foo [..]
312-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
319+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
313320
[RUNNING] `[..]/target/debug/build/foo-[..]/build-script-build`
314321
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
315322
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units={affected} -C debuginfo=2 [..]
@@ -372,12 +379,13 @@ fn profile_selection_test_release() {
372379
//
373380
p.cargo("test --release -vv").masquerade_as_nightly_cargo().with_stderr_unordered(format!("\
374381
[COMPILING] bar [..]
375-
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
382+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
376383
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]
384+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C opt-level=3[..]-C codegen-units=2[..]
377385
[COMPILING] bdep [..]
378-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
386+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
379387
[COMPILING] foo [..]
380-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
388+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=6 [..]
381389
[RUNNING] `[..]/target/release/build/foo-[..]/build-script-build`
382390
[foo 0.0.1] foo custom build PROFILE=release DEBUG=false OPT_LEVEL=3
383391
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]
@@ -441,10 +449,11 @@ fn profile_selection_bench() {
441449
[COMPILING] bar [..]
442450
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units={affected} [..]
443451
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units={affected} [..]
452+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
444453
[COMPILING] bdep [..]
445-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units={affected} [..]
454+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
446455
[COMPILING] foo [..]
447-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link -C opt-level=3[..]-C codegen-units={affected} [..]
456+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=6 [..]
448457
[RUNNING] `[..]target/release/build/foo-[..]/build-script-build`
449458
[foo 0.0.1] foo custom build PROFILE=release DEBUG=false OPT_LEVEL=3
450459
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units={affected} [..]
@@ -504,13 +513,13 @@ fn profile_selection_check_all_targets() {
504513
//
505514
p.cargo("check --all-targets -vv").masquerade_as_nightly_cargo().with_stderr_unordered("\
506515
[COMPILING] bar [..]
507-
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
516+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
508517
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata[..]-C codegen-units=1 -C debuginfo=2 [..]
509518
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
510519
[COMPILING] bdep[..]
511-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
520+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
512521
[COMPILING] foo [..]
513-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
522+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
514523
[RUNNING] `[..]target/debug/build/foo-[..]/build-script-build`
515524
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
516525
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]metadata -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
@@ -550,13 +559,13 @@ fn profile_selection_check_all_targets_release() {
550559
// `dev` for all targets.
551560
p.cargo("check --all-targets --release -vv").masquerade_as_nightly_cargo().with_stderr_unordered("\
552561
[COMPILING] bar [..]
553-
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
562+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
554563
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata -C opt-level=3[..]-C codegen-units=2 [..]
555564
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]
556565
[COMPILING] bdep[..]
557-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
566+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link [..]-C codegen-units=6 [..]
558567
[COMPILING] foo [..]
559-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
568+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=6 [..]
560569
[RUNNING] `[..]target/release/build/foo-[..]/build-script-build`
561570
[foo 0.0.1] foo custom build PROFILE=release DEBUG=false OPT_LEVEL=3
562571
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]metadata -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]
@@ -611,12 +620,12 @@ fn profile_selection_check_all_targets_test() {
611620
//
612621
p.cargo("check --all-targets --profile=test -vv").masquerade_as_nightly_cargo().with_stderr_unordered(format!("\
613622
[COMPILING] bar [..]
614-
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
623+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
615624
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata[..]-C codegen-units={affected} -C debuginfo=2 [..]
616625
[COMPILING] bdep[..]
617-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
626+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
618627
[COMPILING] foo [..]
619-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
628+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
620629
[RUNNING] `[..]target/debug/build/foo-[..]/build-script-build`
621630
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
622631
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]metadata[..]-C codegen-units={affected} -C debuginfo=2 [..]
@@ -658,13 +667,13 @@ fn profile_selection_doc() {
658667
p.cargo("doc -vv").masquerade_as_nightly_cargo().with_stderr_unordered("\
659668
[COMPILING] bar [..]
660669
[DOCUMENTING] bar [..]
661-
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
670+
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
662671
[RUNNING] `rustdoc [..]--crate-name bar bar/src/lib.rs [..]
663672
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
664673
[COMPILING] bdep [..]
665-
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
674+
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
666675
[COMPILING] foo [..]
667-
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
676+
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
668677
[RUNNING] `[..]target/debug/build/foo-[..]/build-script-build`
669678
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
670679
[DOCUMENTING] foo [..]

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