Squashed 'third_party/rules_rust/' changes from bf59038cac..078c6908fc
078c6908fc add cc_common.link support for rust_library and rust_test (#1490)
c07aef0287 Skip supplying rpaths on Fuchsia (#1511)
6ee7c80bdb Propagate rustc_env{,_files} from rust_test.crate (#1443)
1cd0788d2a Apply get_lib_name correctly to the C++ runtime libraries (#1508)
90808f0dc4 Minor cleanup to documentation (#1505)
735640f2df Enable rust-analyzer tests on windows. (#1506)
0f34573166 Updated rules_rust to version 0.9.0 (#1503)
9b61b49934 Promoted crate_universe to non-experimental (#1504)
76360dd354 Implement rules archive release artifact in github action. (#1501)
4e5fac5980 Do not pass `--Clink-arg=-l` for libstd and libtest (#1500)
6c38934636 pipelining: add the ability to disable pipelining for a single rule. (#1499)
867fc37c17 rules_rust: enable pipelined compilation. (#1275)
c97f255dfe Delete deprecated targets (#1496)
43b42884a7 Updated examples to use crate_universe (#1494)
0ffde973e8 Updated `//util/import` to use crate_universe (#1492)
83a03ab03e Updated proto rules to fetch dependencies using crate_universe (#1491)
67e204ff22 fix: `rust_doc_test` failure to find params file (#1418)
0fc834bdfa Updated all toolchain_type definitions to be named `toolchain_type`. (#1479)
3be056a7a3 toolchain files: ensure test depends on std (#1486)
228ebfa6eb Updated rules_rust to version `0.8.1`. (#1484)
685dfda497 Fixed use of rust-analyzer with rust_static_library and rust_shared_library (#1482)
2d7f94543f Fix rust-analyzer being unable to find rust sysroot sources. (#1483)
81a77acde2 Updated rules_rust to version `0.8.0`. (#1472)
caad908848 Give useful error on missing workspace manifest (#1475)
0e86b9dd30 Added `rust_analyzer_toolchain` and repository rules for creating one (#1455)
838e4ea828 Update docs on lockfiles (#1477)
fce1222628 Fix typo in function name (#1478)
1929bfbc3e Added Rust version 1.62.1 (#1476)
9a8e878d3d Fix `rust_binary_without_process_wrapper` build with `--stamp` (#1473)
25baabc205 Updated bindgen version (#1470)
8c9d5c7051 Updated rust-analyzer generator to use clap (#1471)
6d8009dbc8 Update `//bindgen` to use `crate_universe` (#1440)
67c97d44ff Updated `tools/rust_analyzer` to use `crate_universe`. (#1448)
6c285eb28e Updated `wasm_bindgen` rules dependencies. (#1464)
82a437cc17 Fixed crate_universe lockfile checks for crates_repository rule (#1468)
e83d5f3c77 Limit coverage to requested files (#1467)
daff327ea7 Stamp only binaries by default (#1452)
adc80a301d Cleanup crate_universe dependency macros (#1460)
824b121acc Updated header of crate_universe generated files to include a regen command (#1461)
d44e1d8363 feat: add `rustc_flags` attr to `rust_doc` rule (#1458)
6b54feb0ff add a way to distinguish proc-macro deps (#1420)
6070b3c9f4 Fixed missing items in distro artifact (#1450)
1e83e74159 do not add proc-macro deps to transitive_link_search_paths (#1424)
ced94dec1b Fix @libgit2 (#1457)
03d1d5e4ac Add extra_rustc_flag and extra_exec_rustc_flag (#1413)
711adc7985 crate_universe: shorten `crate_universe_crate_index` to `cui` (#1454)
8cb9247f18 Replaced small genrules with uses of bazel_skylib (#1451)
38e841aece Upgrade stardoc (#1444)
674762f66a Updated toolchain repository rules to represent one toolchain per repo (#1442)
b22a6e1416 Re-enable disabled windows jobs in CI (#1353)
2fb94c48fd docs: Update homepage to use latest version (#1441)
389c58fcb1 Updated rules_rust to version `0.7.0`. (#1436)
60f26d49d8 exclude `BUILD` and `WORKSPACE` files from generated crate_universe targets (#1437)
26344d4cd7 Have rust_test put its compilation outputs in a subdirectory (#1434)
8b0f644122 Updated crate_universe version to `0.4.0`. (#1435)
adf92b1534 update crate_universe `--repin` args to not require values. (#1433)
da75146d0a Do not attempt to instrument rust code for coverage if rust_toolchain.llvm-cov is None (#1432)
bde2c36821 Added Rust 1.62.0 (#1427)
7056f22bd0 Fixed crate_universe not finding target library names for "rlib"s (#1429)
3d65214d23 crate_universe support for individually updating packages. (#1426)
5a9d999db9 Updated `attr.label` attribute defaults to use `Label` constructor (#1422)
52fc70145a Added `TemplateVariableInfo` to `rust_toolchain`. (#1416)
7465c1aa29 Add test coverage support (#1324)
c5c3603da6 Bump the min supported bazel version (#1414)
937bdc9d05 Add a `cargo_dep_env` rule for setting build.rs environment variables (#1415)
91466fc0d1 Updated `rules_rust` version to `0.6.0`. (#1397)
97264b79d5 Update wasm_bindgen to use crate universe. (#1398)
d3197a65c5 Updated crate_universe version (to `0.3.0`) and dependencies (#1409)
a15e67d666 Deleted "extra workspace member" functionality from crate_universe (#1406)
5910a7585a Use a vec, not set for rustc_flags for crate_universe annotations (#1404)
3aa88ab067 Deleted deprecated `rust_analyzer` rule. (#1405)
7adf7210d0 cargo: Fix handling of relative sysroots (#1371)
57607239ec Enable rustfmt CI for Windows. (#1403)
30e68b49be Added more "ignore" tags to rustfmt and clippy rules. (#1400)
53ad14eead Added support for vendoring external manifests (#1381)
ff243c6ef0 Reorganized rustfmt source tree (#1399)
94e0044afe Refactored the Rustfmt tool to work cross-platform (#1375)
8fca438124 Ran clang-format on all C++ sources (#1396)
e765719e29 Added TemplateVariableInfo to rust_toolchain (#1377)
81590f4b6a Fixed Clippy bug with `--@rules_rust//:clippy_flags`. (#1392)
d77b9f7c6a Use `target_compatible_with` to make `macos` with `Xcode` happy (#1391)
ec27dbe310 Added comments to internal function (#1378)
a9dd2f9200 Removed deprecated file (#1380)
16175c881c Renamed toolchain files targets (#1376)
c7cb5bd7a8 Support crates that have mix of generated and nongenerated inputs (#1340)
521e649ff4 Avoid using common substrings as encodings. (#1370)
28ac6b133d Use a more compact encoding in the `import` macro. (#1365)
3a099bfa97 Fix incorrect assertion in test_env_launcher test (#1368)
4661093fb1 Use target instead of rule in rust_register_toolchains edition docs (#1366)
652f2802e3 Add `env` attribute to `rust_toolchain`. (#1363)
9520f37f1e Update rules_perl in examples (#1364)
1b451c301e Add armv7-linux-androideabi tier 2 triple (#1362)
0265c293f1 Ensure crate_features to be included correctly in rust_project.json (#1356)
121d65fe6a Updated `rules_rust` version to `0.5.0` (#1360)
aca4ec1a0f crate_universe: fix typo (#1314)
69ca2611c5 Don't leak native dependencies of proc_macro (#1359)
4c7f08b8b9 Fixed missing docs (#1358)
e48bec94de feat: build script toolchains annotations (#1344)
ffb946f4b7 Ensure memchr is linked after libobject (#1349)
edca1d8042 Add developing notes for crate_universe (#1351)
120f911d2f Updated rust_bindgen dependencies API (#1354)
42c4528a5f Added Rust 1.61.0 (#1347)
c05e0c6ab1 Fixed fetch_shas script to correctly include .gz and .xz extensions (#1355)
9770b0dd75 Update apple_support (#1346)
87eb807e67 Added support for Rust 1.61.0 to crate_universe (#1348)
84c1d42128 Temporarily disable windows job in CI. (#1352)
421d30e4ff Remove unnecessary `crate_name` usage in `rust_test_suite`. (#1345)
10185339dd Build `rust_test` targets with `crate` using the same crate name as the underlying library target. (#1332)
0049ce3884 Add support for riscv32 targets (#1323)
3aa6de3c63 remove experimental_use_whole_archive_for_native_deps (#1338)
a066bfed46 Replace slashes with underscores in default crate names. (#1336)
1b91e592d5 Revert "Replace slashes with underscores in default crate names. (#1334)" (#1335)
51f8e302e9 "sandwich" rlibs between native deps in linker order (#1333)
df354904a1 Replace slashes with underscores in default crate names. (#1334)
21eed19188 Bump version to 0.4.0 (#1329)
d3d9abac4d Support . workspace member (#1326)
fccaae3055 Error calling `all_crate_deps` without `Cargo.toml` (#1327)
d7c532cb78 Updated wasm_bindgen dependencies API (#1313)
fb4d5546ea Updated wasm_bindgen rules to only require core `rules_nodejs` rules (#1311)
1590670ae1 Prevents running of clippy on bindgen targets (#1320)
73d0164a34 Add support for aarch64-apple-ios-sim (#1304)
61eee54c73 Add bazel-* directories in cargo_manifest_dir/external_crate to gitignore (#1279)
42f78f25e1 crate_universe: Improved documentation (#1305)
bddc4bd94a Silence warnings for example/test dependencies (#1312)
b04fe3b21f Use tinyjson from crates.io instead of github.com. (#1309)
1cab691d14 Remove doc about STATIC_RUST_URL env var. (#1306)
d86e06a884 Don't propagate non-shared transitive linker inputs from `rust_static|shared_library` (#1299)
5abeb93333 Don't emit `CrateInfo` from `rust_static_library` and `rust_shared_library` (#1298)
0175a1b7aa fix for using a nightly channel after https://github.com/bazelbuild/rules_rust/commit/841fc6fb82141576d91aecb1d3f2656d58b0ab71 (#1302)
e07881fa22 Updated crate_universe docs (#1301)
c63ad973f1 rustc: fix a conditional (#1300)
a6f332fcbe Use __EXEC_ROOT__ paths for genfiles in rust_analyzer aspect (#1293)
97de47df51 Remove 'triple' field from triple struct in favor of 'str' (#1297)
58627f59eb Make get_host_triple public to get a triple from Bazel's repository_ctx (#1289)
612f4362bc Updated `rules_rust` version to `0.3.1` (#1296)
26fa5a15de Fixed build issues in release artifact (#1295)
48bb32f817 crate_universe: Added tests for serialized config files. (#1291)
841fc6fb82 Enable xz archives (#1284)
f7cb22efa6 feat(#514): pass extra flags to clippy (#1264)
e9f8b48711 Updated `rules_rust` version to `0.3.0` (#1288)
c900e1c66c Revert "Add workaround for arm vs armv7 android issue (#1259)" (#1290)
01ebef2fb9 Remove DEFAULT_RUST_EDITION (#1256)
03a70796ab Outside of examples, fill in all `edition` attrs (#1257)
207ee4fbcf feat: support extra deps in rust_doc_test (#1286)
4e7d114a8e Fix typo in render config doc (#1281)
db17f291d3 Fix crate annotation anchor (#1282)
fdb6851a92 Fix target name in `rust_test` example. (#1280)
4fb6e40147 Don't leak additive build file content across crates (#1278)
965044ae2b Remove `rust_test` example which doesn't build. (#1267)
f6e7e0a93f add a stopgap experimental_use_whole_archive_for_native_deps attribute (#1269)
34fd46756a process_wrapper: add support for terminating rustc after it emits rmeta. (#1207)
b778fca0ac crate_universe: propagate build_script_tools (#1266)
f6f27a8734 Add workaround for arm vs armv7 android issue (#1259)
c3f56c2d50 Add the BUILD.bazel file to the wasm_bindgen distro filegroup target (#1246) (#1261)
1f2e6231de Set edition for process_wrapper and cargo_build_script_runner (#1254)
55790492ac Updated Rust to 1.60.0 (#1247)
b594f90f17 Workaround for issue in linux Cargo binaries (#1252)
8f0dd9042e rust_test_suite: ensure crate names are valid (#1248)
4144ddeb9c Updating `rules_rust` version to `0.2.1` (#1243)
65cad76a52 Fixed proto package in release artifact (#1241)
4d8de6e361 Updated repository pin in the docs (#1240)
e5a3970754 Updating `rules_rust` version to `0.2.0` (#1235)
d061bf640e Updated `crate_universe` version to `0.2.0` (#1239)
c0505da0d2 Replace `rust_repositories` with `rust_register_toolchains` in docs (#1237)
145ad7609f Fixed `crates_repository` deleting `.cargo/config.toml` files. (#1227)
20066b05e2 fix: distribute `//tools/rust_analyzer` (#1234)
b58ce89603 Enabled `rust_doc_test` for `crate_universe` (#1232)
d2e2470cbf Fix some unit tests to run from another workspace (#1226)
b03aee039a Fixed `crate_universe` clippy defects (#1228)
41b39f0c99 add bots using lld (and examples with clang as a drive by) (#1221)
84e98e4d2f don't emit --codegen={metadata,extra-filename} for rust_static_library and rust_shared_library (#1222)
e48c834a40 Renamed `crate_index` repository to `crate_universe_crate_index` (#1217)
99b4b2574f fix use of stamping in rust_binary_without_process_wrapper (#1218)
8df4517d37 Add NUM_JOBS env var to cargo build scripts (#1216)
628e85e70f Restrucutred `crate_universe` dependency macros (#1208)
e3d67a0a10 Updated docs to guide users to using releases (#1213)
fd912e644c Updated crate_universe docs. (#1212)
cde4c0826c Delete deprecated `rules` targets (#1210)
26e01c8386 cache the release archive in release actions (#1201)
3205c9d846 Updated crate_universe setup guide (#1202)
c078494678 Don't leak deps from rust_proc_macro (#1206)
7c865ffeb1 Build `_import_macro_dep` in `exec` mode (#1203)
635da93206 Updating `rules_rust` version to `0.1.0`. (#1198)
6c797c9070 disable advanced features of C++ rules (#1200)
86d47a1bba Tweak import macro bootstrap to trick rust analyzer aspect (#1179)
80d197205a Added release workflow (#1195)
cd44b3670a Added support for producing distribution archives (#1194)
a665447989 Traverse custom alias-like rules in the rust analyzer aspect (#1190)
4504983fa9 Add a test showing that rust_analayzer aspect traverses aliases (#1188)
297dd18215 Updated `crate_universe` to version `0.1.0`. (#1197)
0d9c7d5e1b Specify root target for rust_analyzer test (#1189)
4a0352fecd Updated `crate_universe` dependencies (#1196)
5126479254 Fixed crate_universe release tools (#1193)
e840400eb6 Remove last remains of use_process_wrapper flag. (#1192)
eb7db68d96 Fix iOS linker arguments (#1186)
de726a10c9 Create internal rust_binary rule instead of using transitions (#1187)
5e6ad9f638 Regenerated `cargo-raze` outputs with v0.15.0 (#1184)
980b662843 add static_library to get_preferred_artifact with pic (#1183)
97fd329540 Populate CFLAGS and CXXFLAGS when invoking build script. (#1081)
git-subtree-dir: third_party/rules_rust
git-subtree-split: 078c6908fc32c168b58e72cc3884dd8e30419e3a
Signed-off-by: Brian Silverman <bsilver16384@gmail.com>
Change-Id: Ifc218edaa852263bd76835ee7de44de07c08aec2
diff --git a/rust/private/utils.bzl b/rust/private/utils.bzl
index fa7318b..583dc6e 100644
--- a/rust/private/utils.bzl
+++ b/rust/private/utils.bzl
@@ -17,6 +17,14 @@
load("@bazel_tools//tools/cpp:toolchain_utils.bzl", find_rules_cc_toolchain = "find_cpp_toolchain")
load(":providers.bzl", "BuildInfo", "CrateInfo", "DepInfo", "DepVariantInfo")
+UNSUPPORTED_FEATURES = [
+ "thin_lto",
+ "module_maps",
+ "use_header_modules",
+ "fdo_instrument",
+ "fdo_optimize",
+]
+
def find_toolchain(ctx):
"""Finds the first rust toolchain that is configured.
@@ -26,7 +34,7 @@
Returns:
rust_toolchain: A Rust toolchain context.
"""
- return ctx.toolchains[Label("//rust:toolchain")]
+ return ctx.toolchains[Label("//rust:toolchain_type")]
def find_cc_toolchain(ctx):
"""Extracts a CcToolchain from the current target's context
@@ -43,7 +51,7 @@
ctx = ctx,
cc_toolchain = cc_toolchain,
requested_features = ctx.features,
- unsupported_features = ctx.disabled_features,
+ unsupported_features = UNSUPPORTED_FEATURES + ctx.disabled_features,
)
return cc_toolchain, feature_configuration
@@ -89,8 +97,8 @@
path_parts = path.split("/")
return [part for part in path_parts if part != "."]
-def get_lib_name(lib):
- """Returns the name of a library artifact, eg. libabc.a -> abc
+def get_lib_name_default(lib):
+ """Returns the name of a library artifact.
Args:
lib (File): A library file
@@ -122,6 +130,44 @@
else:
return libname
+# TODO: Could we remove this function in favor of a "windows" parameter in the
+# above function? It looks like currently lambdas cannot accept local parameters
+# so the following doesn't work:
+# args.add_all(
+# cc_toolchain.dynamic_runtime_lib(feature_configuration = feature_configuration),
+# map_each = lambda x: get_lib_name(x, for_windows = toolchain.os.startswith("windows)),
+# format_each = "-ldylib=%s",
+# )
+def get_lib_name_for_windows(lib):
+ """Returns the name of a library artifact for Windows builds.
+
+ Args:
+ lib (File): A library file
+
+ Returns:
+ str: The name of the library
+ """
+ # On macos and windows, dynamic/static libraries always end with the
+ # extension and potential versions will be before the extension, and should
+ # be part of the library name.
+ # On linux, the version usually comes after the extension.
+ # So regardless of the platform we want to find the extension and make
+ # everything left to it the library name.
+
+ # Search for the extension - starting from the right - by removing any
+ # trailing digit.
+ comps = lib.basename.split(".")
+ for comp in reversed(comps):
+ if comp.isdigit():
+ comps.pop()
+ else:
+ break
+
+ # The library name is now everything minus the extension.
+ libname = ".".join(comps[:-1])
+
+ return libname
+
def abs(value):
"""Returns the absolute value of a number.
@@ -162,8 +208,10 @@
File: Returns the first valid library type (only one is expected)
"""
if use_pic:
+ # Order consistent with https://github.com/bazelbuild/bazel/blob/815dfdabb7df31d4e99b6fc7616ff8e2f9385d98/src/main/java/com/google/devtools/build/lib/rules/cpp/CcLinkingContext.java#L437.
return (
library_to_link.pic_static_library or
+ library_to_link.static_library or
library_to_link.interface_library or
library_to_link.dynamic_library
)
@@ -176,12 +224,12 @@
)
def _expand_location(ctx, env, data):
- """A trivial helper for `_expand_locations`
+ """A trivial helper for `expand_dict_value_locations` and `expand_list_element_locations`
Args:
ctx (ctx): The rule's context object
env (str): The value possibly containing location macros to expand.
- data (sequence of Targets): see `_expand_locations`
+ data (sequence of Targets): See one of the parent functions.
Returns:
string: The location-macro expanded version of the string.
@@ -189,8 +237,12 @@
for directive in ("$(execpath ", "$(location "):
if directive in env:
# build script runner will expand pwd to execroot for us
- env = env.replace(directive, "${pwd}/" + directive)
- return ctx.expand_location(env, data)
+ env = env.replace(directive, "$${pwd}/" + directive)
+ return ctx.expand_make_variables(
+ env,
+ ctx.expand_location(env, data),
+ {},
+ )
def expand_dict_value_locations(ctx, env, data):
"""Performs location-macro expansion on string values.
@@ -207,7 +259,9 @@
as compilation happens in a separate sandbox folder, so when it comes time
to read the file at runtime, the path is no longer valid.
- See [`expand_location`](https://docs.bazel.build/versions/main/skylark/lib/ctx.html#expand_location) for detailed documentation.
+ For detailed documentation, see:
+ - [`expand_location`](https://bazel.build/rules/lib/ctx#expand_location)
+ - [`expand_make_variables`](https://bazel.build/rules/lib/ctx#expand_make_variables)
Args:
ctx (ctx): The rule's context object
@@ -228,7 +282,9 @@
which process_wrapper and build_script_runner will expand at run time
to the absolute path.
- See [`expand_location`](https://docs.bazel.build/versions/main/skylark/lib/ctx.html#expand_location) for detailed documentation.
+ For detailed documentation, see:
+ - [`expand_location`](https://bazel.build/rules/lib/ctx#expand_location)
+ - [`expand_make_variables`](https://bazel.build/rules/lib/ctx#expand_make_variables)
Args:
ctx (ctx): The rule's context object
@@ -262,7 +318,9 @@
Returns:
str: The name of the crate for this target.
"""
- return name.replace("-", "_")
+ for illegal in ("-", "/"):
+ name = name.replace(illegal, "_")
+ return name
def _invalid_chars_in_crate_name(name):
"""Returns any invalid chars in the given crate name.
@@ -451,37 +509,37 @@
# the second element is an encoding of that char suitable for use in a crate
# name.
_encodings = (
- (":", "colon"),
- ("!", "bang"),
- ("%", "percent"),
- ("@", "at"),
+ (":", "x"),
+ ("!", "excl"),
+ ("%", "prc"),
+ ("@", "ao"),
("^", "caret"),
- ("`", "backtick"),
- (" ", "space"),
- ("\"", "quote"),
- ("#", "hash"),
- ("$", "dollar"),
- ("&", "ampersand"),
- ("'", "backslash"),
- ("(", "lparen"),
- (")", "rparen"),
- ("*", "star"),
- ("-", "dash"),
- ("+", "plus"),
- (",", "comma"),
- (";", "semicolon"),
- ("<", "langle"),
- ("=", "equal"),
- (">", "rangle"),
- ("?", "question"),
- ("[", "lbracket"),
- ("]", "rbracket"),
- ("{", "lbrace"),
- ("|", "pipe"),
- ("}", "rbrace"),
- ("~", "tilde"),
- ("/", "slash"),
- (".", "dot"),
+ ("`", "bt"),
+ (" ", "sp"),
+ ("\"", "dq"),
+ ("#", "octo"),
+ ("$", "dllr"),
+ ("&", "amp"),
+ ("'", "sq"),
+ ("(", "lp"),
+ (")", "rp"),
+ ("*", "astr"),
+ ("-", "d"),
+ ("+", "pl"),
+ (",", "cm"),
+ (";", "sm"),
+ ("<", "la"),
+ ("=", "eq"),
+ (">", "ra"),
+ ("?", "qm"),
+ ("[", "lbk"),
+ ("]", "rbk"),
+ ("{", "lbe"),
+ ("|", "pp"),
+ ("}", "rbe"),
+ ("~", "td"),
+ ("/", "y"),
+ (".", "pd"),
)
# For each of the above encodings, we generate two substitution rules: one that
@@ -489,15 +547,18 @@
# aren't clobbered by this translation, and one that does the encoding itself.
# We also include a rule that protects the clobbering-protection rules from
# getting clobbered.
-_substitutions = [("_quote", "_quotequote_")] + [
+_substitutions = [("_z", "_zz_")] + [
subst
for (pattern, replacement) in _encodings
for subst in (
- ("_{}_".format(replacement), "_quote{}_".format(replacement)),
+ ("_{}_".format(replacement), "_z{}_".format(replacement)),
(pattern, "_{}_".format(replacement)),
)
]
+# Expose the substitutions for testing only.
+substitutions_for_testing = _substitutions
+
def encode_label_as_crate_name(package, name):
"""Encodes the package and target names in a format suitable for a crate name.
@@ -508,8 +569,21 @@
Returns:
A string that encodes the package and target name, to be used as the crate's name.
"""
- full_name = package + ":" + name
- return _replace_all(full_name, _substitutions)
+ return _encode_raw_string(package + ":" + name)
+
+def _encode_raw_string(str):
+ """Encodes a string using the above encoding format.
+
+ Args:
+ str (string): The string to be encoded.
+
+ Returns:
+ An encoded version of the input string.
+ """
+ return _replace_all(str, _substitutions)
+
+# Expose the underlying encoding function for testing only.
+encode_raw_string_for_testing = _encode_raw_string
def decode_crate_name_as_label_for_testing(crate_name):
"""Decodes a crate_name that was encoded by encode_label_as_crate_name.
@@ -574,3 +648,25 @@
string = string[:pattern_start] + replacement + string[after_pattern:]
return string
+
+def can_build_metadata(toolchain, ctx, crate_type):
+ """Can we build metadata for this rust_library?
+
+ Args:
+ toolchain (toolchain): The rust toolchain
+ ctx (ctx): The rule's context object
+ crate_type (String): one of lib|rlib|dylib|staticlib|cdylib|proc-macro
+
+ Returns:
+ bool: whether we can build metadata for this rule.
+ """
+
+ # In order to enable pipelined compilation we require that:
+ # 1) The _pipelined_compilation flag is enabled,
+ # 2) the OS running the rule is something other than windows as we require sandboxing (for now),
+ # 3) process_wrapper is enabled (this is disabled when compiling process_wrapper itself),
+ # 4) the crate_type is rlib or lib.
+ return toolchain._pipelined_compilation and \
+ toolchain.os != "windows" and \
+ ctx.attr._process_wrapper and \
+ crate_type in ("rlib", "lib")