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Auto merge of #82451 - jyn514:defaults, r=Mark-Simulacrum

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Cleanup option parsing and config.toml.example

- Add an assertion that `link-shared = true` when `thin-lto = true`.
  Previously, link-shared would be silently overwritten.

- Get rid of `Option<bool>` in bootstrap/config.rs. Set defaults
  immediately instead of delaying until later in bootstrap. This makes
  it easier to find what the default value is.

- Remove redundant `config.x = false` when the default was already false
- Set defaults for `bindir` in `default_opts()` instead of `parse()`
- Update `download-ci-llvm = if-supported` option to match bootstrap.py
- Remove redundant check for link_shared. Previously, it was checked twice.

- Update various options in config.toml.example to their defaults.
  Previously, some options showed an example value instead of the
  default value.

- Fix incorrect defaults in config.toml.example
  + `use-libcxx` defaults to false
  + Add missing `check-stage = 0`
  + Update several defaults to be conditional (e.g. `if incremental { 10 } else { 100 }`)

- Remove redundant defaults in prose
- Use the same comment for the default and target-dependent `musl-root`
- Fix typos
- Link to `cc_detect` for `cc` and `cxx`, since the logic is ... complicated.
- Update more defaults to better reflect how they actually get set
- Remove ignored `gpg-password-file` option

  This stopped being used in
  7704d35,
  but was never removed from config.toml.

- Remove unused flags from `config.toml`
    + Disallow `infodir` and `localstatedir` in `config.toml`
    + Allow the flags in `./configure`, but give a warning that they will be
      ignored.
    + Fix incorrect comment that `datadir` will be ignored.

    Example output:

    ```
    $ ./configure --set install.infodir=xxx
    configure: processing command line
    configure:
    configure: install.infodir      := xxx
    configure: build.configure-args := ['--set', 'install.infodir=xxx']
    warning: infodir will be ignored
    configure:
    configure: writing `config.toml` in current directory
    configure:
    configure: run `python /home/joshua/rustc3/x.py --help`
    configure:
    ```

- Update CHANGELOG

cc https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/bootstrap.20defaults
This commit is contained in:
bors 2021-04-07 20:44:37 +00:00
commit 361bfce305
6 changed files with 106 additions and 96 deletions
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136
config.toml.example
View File

@ -112,6 +112,7 @@ changelog-seen = 2
# When invoking `llvm-config` this configures whether the `--shared` argument is
# passed to prefer linking to shared libraries.
# NOTE: `thin-lto = true` requires this to be `true` and will give an error otherwise.
#link-shared = false
# When building llvm, this configures what is being appended to the version.
@ -120,22 +121,23 @@ changelog-seen = 2
#version-suffix = "-rust-dev"
# On MSVC you can compile LLVM with clang-cl, but the test suite doesn't pass
# with clang-cl, so this is special in that it only compiles LLVM with clang-cl
#clang-cl = '/path/to/clang-cl.exe'
# with clang-cl, so this is special in that it only compiles LLVM with clang-cl.
# Note that this takes a /path/to/clang-cl, not a boolean.
#clang-cl = cc
# Pass extra compiler and linker flags to the LLVM CMake build.
#cflags = "-fextra-flag"
#cxxflags = "-fextra-flag"
#ldflags = "-Wl,extra-flag"
#cflags = ""
#cxxflags = ""
#ldflags = ""
# Use libc++ when building LLVM instead of libstdc++. This is the default on
# platforms already use libc++ as the default C++ library, but this option
# allows you to use libc++ even on platforms when it's not. You need to ensure
# that your host compiler ships with libc++.
#use-libcxx = true
#use-libcxx = false
# The value specified here will be passed as `-DLLVM_USE_LINKER` to CMake.
#use-linker = "lld"
#use-linker = <none> (path)
# Whether or not to specify `-DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=YES`
#allow-old-toolchain = false
@ -147,6 +149,9 @@ changelog-seen = 2
# General build configuration options
# =============================================================================
[build]
# The default stage to use for the `check` subcommand
#check-stage = 0
# The default stage to use for the `doc` subcommand
#doc-stage = 0
@ -170,14 +175,14 @@ changelog-seen = 2
# binaries of this build triple and the nightly will be used to bootstrap the
# first compiler.
#
# Defaults to host platform
#build = "x86_64-unknown-linux-gnu"
# Defaults to platform where `x.py` is run.
#build = "x86_64-unknown-linux-gnu" (as an example)
# Which triples to produce a compiler toolchain for. Each of these triples will
# be bootstrapped from the build triple themselves.
#
# Defaults to just the build triple
#host = ["x86_64-unknown-linux-gnu"]
# Defaults to just the build triple.
#host = ["x86_64-unknown-linux-gnu"] (as an example)
# Which triples to build libraries (core/alloc/std/test/proc_macro) for. Each of
# these triples will be bootstrapped from the build triple themselves.
@ -185,7 +190,7 @@ changelog-seen = 2
# Defaults to `host`. If you set this explicitly, you likely want to add all
# host triples to this list as well in order for those host toolchains to be
# able to compile programs for their native target.
#target = ["x86_64-unknown-linux-gnu"]
#target = ["x86_64-unknown-linux-gnu"] (as an example)
# Use this directory to store build artifacts.
# You can use "$ROOT" to indicate the root of the git repository.
@ -193,15 +198,15 @@ changelog-seen = 2
# Instead of downloading the src/stage0.txt version of Cargo specified, use
# this Cargo binary instead to build all Rust code
#cargo = "/path/to/bin/cargo"
#cargo = "/path/to/cargo"
# Instead of downloading the src/stage0.txt version of the compiler
# specified, use this rustc binary instead as the stage0 snapshot compiler.
#rustc = "/path/to/bin/rustc"
#rustc = "/path/to/rustc"
# Instead of download the src/stage0.txt version of rustfmt specified,
# use this rustfmt binary instead as the stage0 snapshot rustfmt.
#rustfmt = "/path/to/bin/rustfmt"
#rustfmt = "/path/to/rustfmt"
# Flag to specify whether any documentation is built. If false, rustdoc and
# friends will still be compiled but they will not be used to generate any
@ -326,16 +331,9 @@ changelog-seen = 2
# Where to install man pages in `prefix` above
#mandir = "share/man"
# Where to install data in `prefix` above (currently unused)
# Where to install data in `prefix` above
#datadir = "share"
# Where to install additional info in `prefix` above (currently unused)
#infodir = "share/info"
# Where to install local state (currently unused)
# If this is a relative path, it will get installed in `prefix` above
#localstatedir = "/var/lib"
# =============================================================================
# Options for compiling Rust code itself
# =============================================================================
@ -387,7 +385,9 @@ changelog-seen = 2
# Sets the number of codegen units to build the standard library with,
# regardless of what the codegen-unit setting for the rest of the compiler is.
#codegen-units-std = 1
# NOTE: building with anything other than 1 is known to occasionally have bugs.
# See https://github.com/rust-lang/rust/issues/83600.
#codegen-units-std = codegen-units
# Whether or not debug assertions are enabled for the compiler and standard
# library. Debug assertions control the maximum log level used by rustc. When
@ -430,19 +430,13 @@ changelog-seen = 2
#debuginfo-level = 0
# Debuginfo level for the compiler.
#
# Defaults to rust.debuginfo-level value
#debuginfo-level-rustc = 0
#debuginfo-level-rustc = debuginfo-level
# Debuginfo level for the standard library.
#
# Defaults to rust.debuginfo-level value
#debuginfo-level-std = 0
#debuginfo-level-std = debuginfo-level
# Debuginfo level for the tools.
#
# Defaults to rust.debuginfo-level value
#debuginfo-level-tools = 0
#debuginfo-level-tools = debuginfo-level
# Debuginfo level for the test suites run with compiletest.
# FIXME(#61117): Some tests fail when this option is enabled.
@ -469,7 +463,9 @@ changelog-seen = 2
# The default linker that will be hard-coded into the generated compiler for
# targets that don't specify linker explicitly in their target specifications.
# Note that this is not the linker used to link said compiler.
#default-linker = "cc"
#
# See https://doc.rust-lang.org/rustc/codegen-options/index.html#linker for more information.
#default-linker = <none> (path)
# The "channel" for the Rust build to produce. The stable/beta channels only
# allow using stable features, whereas the nightly and dev channels allow using
@ -479,10 +475,15 @@ changelog-seen = 2
# A descriptive string to be appended to `rustc --version` output, which is
# also used in places like debuginfo `DW_AT_producer`. This may be useful for
# supplementary build information, like distro-specific package versions.
#description = ""
#description = <none> (string)
# The root location of the musl installation directory.
#musl-root = "..."
# The root location of the musl installation directory. The library directory
# will also need to contain libunwind.a for an unwinding implementation. Note
# that this option only makes sense for musl targets that produce statically
# linked binaries.
#
# Defaults to /usr on musl hosts. Has no default otherwise.
#musl-root = <platform specific> (path)
# By default the `rustc` executable is built with `-Wl,-rpath` flags on Unix
# platforms to ensure that the compiler is usable by default from the build
@ -505,14 +506,14 @@ changelog-seen = 2
# Having the git information can cause a lot of rebuilds during development.
# Note: If this attribute is not explicitly set (e.g. if left commented out) it
# will default to true if channel = "dev", but will default to false otherwise.
#ignore-git = true
#ignore-git = if channel == "dev" { true } else { false }
# When creating source tarballs whether or not to create a source tarball.
#dist-src = false
#dist-src = true
# After building or testing extended tools (e.g. clippy and rustfmt), append the
# result (broken, compiling, testing) into this JSON file.
#save-toolstates = "/path/to/toolstates.json"
#save-toolstates = <none> (path)
# This is an array of the codegen backends that will be compiled for the rustc
# that's being compiled. The default is to only build the LLVM codegen backend,
@ -548,9 +549,7 @@ changelog-seen = 2
# Compile the compiler with a non-default ThinLTO import limit. This import
# limit controls the maximum size of functions imported by ThinLTO. Decreasing
# will make code compile faster at the expense of lower runtime performance.
# If `incremental` is set to true above, the import limit will default to 10
# instead of LLVM's default of 100.
#thin-lto-import-instr-limit = 100
#thin-lto-import-instr-limit = if incremental { 10 } else { LLVM default (currently 100) }
# Map debuginfo paths to `/rust/$sha/...`, generally only set for releases
#remap-debuginfo = false
@ -584,63 +583,66 @@ changelog-seen = 2
# =============================================================================
[target.x86_64-unknown-linux-gnu]
# C compiler to be used to compiler C code. Note that the
# C compiler to be used to compile C code. Note that the
# default value is platform specific, and if not specified it may also depend on
# what platform is crossing to what platform.
#cc = "cc"
# See `src/bootstrap/cc_detect.rs` for details.
#cc = "cc" (path)
# C++ compiler to be used to compiler C++ code (e.g. LLVM and our LLVM shims).
# C++ compiler to be used to compile C++ code (e.g. LLVM and our LLVM shims).
# This is only used for host targets.
#cxx = "c++"
# See `src/bootstrap/cc_detect.rs` for details.
#cxx = "c++" (path)
# Archiver to be used to assemble static libraries compiled from C/C++ code.
# Note: an absolute path should be used, otherwise LLVM build will break.
#ar = "ar"
#ar = "ar" (path)
# Ranlib to be used to assemble static libraries compiled from C/C++ code.
# Note: an absolute path should be used, otherwise LLVM build will break.
#ranlib = "ranlib"
#ranlib = "ranlib" (path)
# Linker to be used to link Rust code. Note that the
# Linker to be used to bootstrap Rust code. Note that the
# default value is platform specific, and if not specified it may also depend on
# what platform is crossing to what platform.
# Setting this will override the `use-lld` option for Rust code when targeting MSVC.
#linker = "cc"
#linker = "cc" (path)
# Path to the `llvm-config` binary of the installation of a custom LLVM to link
# against. Note that if this is specified we don't compile LLVM at all for this
# target.
#llvm-config = "../path/to/llvm/root/bin/llvm-config"
#llvm-config = <none> (path)
# Normally the build system can find LLVM's FileCheck utility, but if
# not, you can specify an explicit file name for it.
#llvm-filecheck = "/path/to/FileCheck"
#llvm-filecheck = "/path/to/llvm-version/bin/FileCheck"
# If this target is for Android, this option will be required to specify where
# the NDK for the target lives. This is used to find the C compiler to link and
# build native code.
#android-ndk = "/path/to/ndk"
# See `src/bootstrap/cc_detect.rs` for details.
#android-ndk = <none> (path)
# Build the sanitizer runtimes for this target.
# This option will override the same option under [build] section.
#sanitizers = false
#sanitizers = build.sanitizers (bool)
# Build the profiler runtime for this target(required when compiling with options that depend
# on this runtime, such as `-C profile-generate` or `-Z instrument-coverage`).
# This option will override the same option under [build] section.
#profiler = false
#profiler = build.profiler (bool)
# Force static or dynamic linkage of the standard library for this target. If
# this target is a host for rustc, this will also affect the linkage of the
# compiler itself. This is useful for building rustc on targets that normally
# only use static libraries. If unset, the target's default linkage is used.
#crt-static = false
#crt-static = <platform-specific> (bool)
# The root location of the musl installation directory. The library directory
# will also need to contain libunwind.a for an unwinding implementation. Note
# that this option only makes sense for musl targets that produce statically
# linked binaries
#musl-root = "..."
# linked binaries.
#musl-root = build.musl-root (path)
# The full path to the musl libdir.
#musl-libdir = musl-root/lib
@ -648,11 +650,11 @@ changelog-seen = 2
# The root location of the `wasm32-wasi` sysroot. Only used for the
# `wasm32-wasi` target. If you are building wasm32-wasi target, make sure to
# create a `[target.wasm32-wasi]` section and move this field there.
#wasi-root = "..."
#wasi-root = <none> (path)
# Used in testing for configuring where the QEMU images are located, you
# probably don't want to use this.
#qemu-rootfs = "..."
#qemu-rootfs = <none> (path)
# =============================================================================
# Distribution options
@ -669,12 +671,7 @@ changelog-seen = 2
#
# This folder should be populated ahead of time before the build system is
# invoked.
#sign-folder = "path/to/folder/to/sign"
# This is a file which contains the password of the default gpg key. This will
# be passed to `gpg` down the road when signing all files in `sign-folder`
# above. This should be stored in plaintext.
#gpg-password-file = "path/to/gpg/password"
#sign-folder = <none> (path)
# The remote address that all artifacts will eventually be uploaded to. The
# build system generates manifests which will point to these urls, and for the
@ -682,18 +679,19 @@ changelog-seen = 2
#
# Note that this address should not contain a trailing slash as file names will
# be appended to it.
#upload-addr = "https://example.com/folder"
#upload-addr = <none> (URL)
# Whether to build a plain source tarball to upload
# We disable that on Windows not to override the one already uploaded on S3
# as the one built on Windows will contain backslashes in paths causing problems
# on linux
#src-tarball = true
#
# Whether to allow failures when building tools
#missing-tools = false
# List of compression formats to use when generating dist tarballs. The list of
# formats is provided to rust-installer, which must support all of them.
#
# This list must be non-empty.
#compression-formats = ["gz", "xz"]

1
src/bootstrap/CHANGELOG.md
View File

@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
## [Changes since the last major version]
- `llvm-libunwind` now accepts `in-tree` (formerly true), `system` or `no` (formerly false) [#77703](https://github.com/rust-lang/rust/pull/77703)
- The options `infodir`, `localstatedir`, and `gpg-password-file` are no longer allowed in config.toml. Previously, they were ignored without warning. Note that `infodir` and `localstatedir` are still accepted by `./configure`, with a warning. [#82451](https://github.com/rust-lang/rust/pull/82451)
### Non-breaking changes

52
src/bootstrap/config.rs
View File

@ -67,7 +67,7 @@ pub struct Config {
pub rustc_error_format: Option<String>,
pub json_output: bool,
pub test_compare_mode: bool,
pub llvm_libunwind: Option<LlvmLibunwind>,
pub llvm_libunwind: LlvmLibunwind,
pub color: Color,
pub on_fail: Option<String>,
@ -101,8 +101,8 @@ pub struct Config {
pub llvm_link_jobs: Option<u32>,
pub llvm_version_suffix: Option<String>,
pub llvm_use_linker: Option<String>,
pub llvm_allow_old_toolchain: Option<bool>,
pub llvm_polly: Option<bool>,
pub llvm_allow_old_toolchain: bool,
pub llvm_polly: bool,
pub llvm_from_ci: bool,
pub use_lld: bool,
@ -149,7 +149,6 @@ pub struct Config {
// dist misc
pub dist_sign_folder: Option<PathBuf>,
pub dist_upload_addr: Option<String>,
pub dist_gpg_password_file: Option<PathBuf>,
pub dist_compression_formats: Option<Vec<String>>,
// libstd features
@ -404,10 +403,6 @@ struct Install {
libdir: Option<String>,
mandir: Option<String>,
datadir: Option<String>,
// standard paths, currently unused
infodir: Option<String>,
localstatedir: Option<String>,
}
/// TOML representation of how the LLVM build is configured.
@ -564,11 +559,10 @@ impl Config {
config.rust_rpath = true;
config.channel = "dev".to_string();
config.codegen_tests = true;
config.ignore_git = false;
config.rust_dist_src = true;
config.rust_codegen_backends = vec![INTERNER.intern_str("llvm")];
config.deny_warnings = true;
config.missing_tools = false;
config.bindir = "bin".into();
// set by build.rs
config.build = TargetSelection::from_user(&env!("BUILD_TRIPLE"));
@ -598,7 +592,6 @@ impl Config {
config.dry_run = flags.dry_run;
config.keep_stage = flags.keep_stage;
config.keep_stage_std = flags.keep_stage_std;
config.bindir = "bin".into(); // default
config.color = flags.color;
if let Some(value) = flags.deny_warnings {
config.deny_warnings = value;
@ -748,12 +741,25 @@ impl Config {
config.llvm_ldflags = llvm.ldflags.clone();
set(&mut config.llvm_use_libcxx, llvm.use_libcxx);
config.llvm_use_linker = llvm.use_linker.clone();
config.llvm_allow_old_toolchain = llvm.allow_old_toolchain;
config.llvm_polly = llvm.polly;
config.llvm_allow_old_toolchain = llvm.allow_old_toolchain.unwrap_or(false);
config.llvm_polly = llvm.polly.unwrap_or(false);
config.llvm_from_ci = match llvm.download_ci_llvm {
Some(StringOrBool::String(s)) => {
assert!(s == "if-available", "unknown option `{}` for download-ci-llvm", s);
config.build.triple == "x86_64-unknown-linux-gnu"
// This is currently all tier 1 targets (since others may not have CI artifacts)
// https://doc.rust-lang.org/rustc/platform-support.html#tier-1
// FIXME: this is duplicated in bootstrap.py
let supported_platforms = [
"aarch64-unknown-linux-gnu",
"i686-pc-windows-gnu",
"i686-pc-windows-msvc",
"i686-unknown-linux-gnu",
"x86_64-unknown-linux-gnu",
"x86_64-apple-darwin",
"x86_64-pc-windows-gnu",
"x86_64-pc-windows-msvc",
];
supported_platforms.contains(&&*config.build.triple)
}
Some(StringOrBool::Bool(b)) => b,
None => false,
@ -774,7 +780,6 @@ impl Config {
check_ci_llvm!(llvm.targets);
check_ci_llvm!(llvm.experimental_targets);
check_ci_llvm!(llvm.link_jobs);
check_ci_llvm!(llvm.link_shared);
check_ci_llvm!(llvm.clang_cl);
check_ci_llvm!(llvm.version_suffix);
check_ci_llvm!(llvm.cflags);
@ -795,6 +800,11 @@ impl Config {
// If we're building with ThinLTO on, we want to link to LLVM
// shared, to avoid re-doing ThinLTO (which happens in the link
// step) with each stage.
assert_ne!(
llvm.link_shared,
Some(false),
"setting link-shared=false is incompatible with thin-lto=true"
);
config.llvm_link_shared = true;
}
}
@ -820,7 +830,8 @@ impl Config {
set(&mut config.test_compare_mode, rust.test_compare_mode);
config.llvm_libunwind = rust
.llvm_libunwind
.map(|v| v.parse().expect("failed to parse rust.llvm-libunwind"));
.map(|v| v.parse().expect("failed to parse rust.llvm-libunwind"))
.unwrap_or_default();
set(&mut config.backtrace, rust.backtrace);
set(&mut config.channel, rust.channel);
config.description = rust.description;
@ -908,7 +919,6 @@ impl Config {
if let Some(t) = toml.dist {
config.dist_sign_folder = t.sign_folder.map(PathBuf::from);
config.dist_gpg_password_file = t.gpg_password_file.map(PathBuf::from);
config.dist_upload_addr = t.upload_addr;
config.dist_compression_formats = t.compression_formats;
set(&mut config.rust_dist_src, t.src_tarball);
@ -932,12 +942,8 @@ impl Config {
// default values for all options that we haven't otherwise stored yet.
config.llvm_skip_rebuild = llvm_skip_rebuild.unwrap_or(false);
let default = false;
config.llvm_assertions = llvm_assertions.unwrap_or(default);
let default = true;
config.rust_optimize = optimize.unwrap_or(default);
config.llvm_assertions = llvm_assertions.unwrap_or(false);
config.rust_optimize = optimize.unwrap_or(true);
let default = debug == Some(true);
config.rust_debug_assertions = debug_assertions.unwrap_or(default);

5
src/bootstrap/configure.py
View File

@ -439,6 +439,11 @@ def configure_section(lines, config):
lines[i] = "{} = {}".format(key, to_toml(value))
break
if not found:
# These are used by rpm, but aren't accepted by x.py.
# Give a warning that they're ignored, but not a hard error.
if key in ["infodir", "localstatedir"]:
print("warning: {} will be ignored".format(key))
else:
raise RuntimeError("failed to find config line for {}".format(key))

2
src/bootstrap/lib.rs
View File

@ -547,7 +547,7 @@ impl Build {
fn std_features(&self, target: TargetSelection) -> String {
let mut features = "panic-unwind".to_string();
match self.config.llvm_libunwind.unwrap_or_default() {
match self.config.llvm_libunwind {
LlvmLibunwind::InTree => features.push_str(" llvm-libunwind"),
LlvmLibunwind::System => features.push_str(" system-llvm-libunwind"),
LlvmLibunwind::No => {}

4
src/bootstrap/native.rs
View File

@ -256,7 +256,7 @@ impl Step for Llvm {
enabled_llvm_projects.push("compiler-rt");
}
if let Some(true) = builder.config.llvm_polly {
if builder.config.llvm_polly {
enabled_llvm_projects.push("polly");
}
@ -311,7 +311,7 @@ impl Step for Llvm {
cfg.define("LLVM_USE_LINKER", linker);
}
if let Some(true) = builder.config.llvm_allow_old_toolchain {
if builder.config.llvm_allow_old_toolchain {
cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
}