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Build host dependencies with opt-level 0 by default #8500

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merged 1 commit into from
Jul 17, 2020
Merged

Build host dependencies with opt-level 0 by default #8500

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27 changes: 14 additions & 13 deletions crates/cargo-test-support/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1223,22 +1223,23 @@ impl Execs {
// test suite to pass for now, but we may need to get more fancy
// if tests start failing again.
a.sort_by_key(|s| s.len());
let e = out.lines();
let mut failures = Vec::new();

for e_line in e {
for e_line in out.lines() {
match a.iter().position(|a_line| lines_match(e_line, a_line)) {
Some(index) => a.remove(index),
None => {
return Err(format!(
"Did not find expected line:\n\
{}\n\
Remaining available output:\n\
{}\n",
e_line,
a.join("\n")
));
Some(index) => {
a.remove(index);
}
};
None => failures.push(e_line),
}
}
if failures.len() > 0 {
return Err(format!(
"Did not find expected line(s):\n{}\n\
Remaining available output:\n{}\n",
failures.join("\n"),
a.join("\n")
));
}
if !a.is_empty() {
Err(format!(
Expand Down
13 changes: 12 additions & 1 deletion src/cargo/core/profiles.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -487,7 +487,18 @@ fn merge_toml_overrides(
toml: &TomlProfile,
) {
if unit_for.is_for_host() {
if let Some(ref build_override) = toml.build_override {
// For-host units are things like procedural macros, build scripts, and
// their dependencies. For these units most projects simply want them
// to compile quickly and the runtime doesn't matter too much since
// they tend to process very little data. For this reason we default
// them to a "compile as quickly as possible" mode which for now means
// basically turning down the optimization level and avoid limiting
// codegen units. This ensures that we spend little time optimizing as
// well as enabling parallelism by not constraining codegen units.
profile.opt_level = InternedString::new("0");
profile.codegen_units = None;

if let Some(build_override) = &toml.build_override {
merge_profile(profile, build_override);
}
}
Expand Down
5 changes: 5 additions & 0 deletions tests/testsuite/lto.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -184,6 +184,11 @@ fn complicated() {

[profile.release]
lto = true

# force build deps to share an opt-level with the rest of the
# graph so they only get built once.
[profile.release.build-override]
opt-level = 3
"#,
)
.file("build.rs", "fn main() { dep_build::foo() }")
Expand Down
2 changes: 1 addition & 1 deletion tests/testsuite/profile_config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -419,7 +419,7 @@ fn named_config_profile() {
let bo = profiles.get_profile(a_pkg, true, true, UnitFor::new_host(false), mode);
assert_eq!(bo.name, "foo");
assert_eq!(bo.codegen_units, Some(6)); // "foo" build override from config
assert_eq!(bo.opt_level, "1"); // SAME as normal
assert_eq!(bo.opt_level, "0"); // default to zero
assert_eq!(bo.debuginfo, Some(1)); // SAME as normal
assert_eq!(bo.debug_assertions, false); // "foo" build override from manifest
assert_eq!(bo.overflow_checks, true); // SAME as normal
Expand Down
67 changes: 38 additions & 29 deletions tests/testsuite/profile_targets.rs
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,10 @@ fn all_target_project() -> Project {
codegen-units = 3
[profile.bench]
codegen-units = 4
[profile.dev.build-override]
codegen-units = 5
[profile.release.build-override]
codegen-units = 6
"#,
named_profiles = if is_nightly() {
"\"named-profiles\", "
Expand Down Expand Up @@ -90,11 +94,11 @@ fn profile_selection_build() {
p.cargo("build -vv").masquerade_as_nightly_cargo().with_stderr_unordered("\
[COMPILING] bar [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[COMPILING] bdep [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[RUNNING] `[..]/target/debug/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
Expand Down Expand Up @@ -122,11 +126,11 @@ fn profile_selection_build_release() {
p.cargo("build --release -vv").masquerade_as_nightly_cargo().with_stderr_unordered("\
[COMPILING] bar [..]
[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 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
[COMPILING] bdep [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=6 [..]
[RUNNING] `[..]/target/release/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=release DEBUG=false OPT_LEVEL=3
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]
Expand Down Expand Up @@ -181,10 +185,11 @@ fn profile_selection_build_all_targets() {
[COMPILING] bar [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[COMPILING] bdep [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[RUNNING] `[..]/target/debug/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]`
Expand Down Expand Up @@ -248,10 +253,11 @@ fn profile_selection_build_all_targets_release() {
[COMPILING] bar [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[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 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
[COMPILING] bdep [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=6 [..]
[RUNNING] `[..]/target/release/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=release DEBUG=false OPT_LEVEL=3
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]`
Expand Down Expand Up @@ -305,11 +311,12 @@ fn profile_selection_test() {
p.cargo("test -vv").masquerade_as_nightly_cargo().with_stderr_unordered(format!("\
[COMPILING] bar [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units={affected} -C debuginfo=2 [..]
[COMPILING] bdep [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[RUNNING] `[..]/target/debug/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C panic=abort[..]-C codegen-units={affected} -C debuginfo=2 [..]
Expand Down Expand Up @@ -372,12 +379,13 @@ fn profile_selection_test_release() {
//
p.cargo("test --release -vv").masquerade_as_nightly_cargo().with_stderr_unordered(format!("\
[COMPILING] bar [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
[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 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C opt-level=3[..]-C codegen-units=2[..]
[COMPILING] bdep [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=6 [..]
[RUNNING] `[..]/target/release/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=release DEBUG=false OPT_LEVEL=3
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]
Expand Down Expand Up @@ -441,10 +449,11 @@ fn profile_selection_bench() {
[COMPILING] bar [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units={affected} [..]
[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} [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
[COMPILING] bdep [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units={affected} [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link -C opt-level=3[..]-C codegen-units={affected} [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=6 [..]
[RUNNING] `[..]target/release/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=release DEBUG=false OPT_LEVEL=3
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3 -C panic=abort[..]-C codegen-units={affected} [..]
Expand Down Expand Up @@ -504,13 +513,13 @@ fn profile_selection_check_all_targets() {
//
p.cargo("check --all-targets -vv").masquerade_as_nightly_cargo().with_stderr_unordered("\
[COMPILING] bar [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
[COMPILING] bdep[..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[RUNNING] `[..]target/debug/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]metadata -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
Expand Down Expand Up @@ -550,13 +559,13 @@ fn profile_selection_check_all_targets_release() {
// `dev` for all targets.
p.cargo("check --all-targets --release -vv").masquerade_as_nightly_cargo().with_stderr_unordered("\
[COMPILING] bar [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=6 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata -C opt-level=3[..]-C codegen-units=2 [..]
[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 [..]
[COMPILING] bdep[..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link [..]-C codegen-units=6 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link -C opt-level=3[..]-C codegen-units=2 [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=6 [..]
[RUNNING] `[..]target/release/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=release DEBUG=false OPT_LEVEL=3
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]metadata -C opt-level=3 -C panic=abort[..]-C codegen-units=2 [..]
Expand Down Expand Up @@ -611,12 +620,12 @@ fn profile_selection_check_all_targets_test() {
//
p.cargo("check --all-targets --profile=test -vv").masquerade_as_nightly_cargo().with_stderr_unordered(format!("\
[COMPILING] bar [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata[..]-C codegen-units={affected} -C debuginfo=2 [..]
[COMPILING] bdep[..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units={affected} -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[RUNNING] `[..]target/debug/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
[RUNNING] `[..] rustc --crate-name foo src/lib.rs [..]--crate-type lib --emit=[..]metadata[..]-C codegen-units={affected} -C debuginfo=2 [..]
Expand Down Expand Up @@ -658,13 +667,13 @@ fn profile_selection_doc() {
p.cargo("doc -vv").masquerade_as_nightly_cargo().with_stderr_unordered("\
[COMPILING] bar [..]
[DOCUMENTING] bar [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[RUNNING] `rustdoc [..]--crate-name bar bar/src/lib.rs [..]
[RUNNING] `[..] rustc --crate-name bar bar/src/lib.rs [..]--crate-type lib --emit=[..]metadata -C panic=abort[..]-C codegen-units=1 -C debuginfo=2 [..]
[COMPILING] bdep [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name bdep bdep/src/lib.rs [..]--crate-type lib --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[COMPILING] foo [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=1 -C debuginfo=2 [..]
[RUNNING] `[..] rustc --crate-name build_script_build build.rs [..]--crate-type bin --emit=[..]link[..]-C codegen-units=5 -C debuginfo=2 [..]
[RUNNING] `[..]target/debug/build/foo-[..]/build-script-build`
[foo 0.0.1] foo custom build PROFILE=debug DEBUG=true OPT_LEVEL=0
[DOCUMENTING] foo [..]
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