rustc invocation standarized (#992)

* rustc invocation standarized

* Addressed comments

* Addressed comments

* Addressed comments

* Updated command output

src/backend/debugging.md

@@ -103,27 +103,27 @@ specifically the `#t-compiler/wg-llvm` stream.
 
 ### Compiler options to know and love
 
-The `-Chelp` and `-Zhelp` compiler switches will list out a variety
+The `-C help` and `-Z help` compiler switches will list out a variety
 of interesting options you may find useful. Here are a few of the most
 common that pertain to LLVM development (some of them are employed in the
 tutorial above):
 
 - The `--emit llvm-ir` option emits a `<filename>.ll` file with LLVM IR in textual format
     - The `--emit llvm-bc` option emits in bytecode format (`<filename>.bc`)
-- Passing `-Cllvm-args=<foo>` allows passing pretty much all the
+- Passing `-C llvm-args=<foo>` allows passing pretty much all the
   options that tools like llc and opt would accept;
-  e.g. `-Cllvm-args=-print-before-all` to print IR before every LLVM
+  e.g. `-C llvm-args=-print-before-all` to print IR before every LLVM
   pass.
-- The `-Cno-prepopulate-passes` will avoid pre-populate the LLVM pass
+- The `-C no-prepopulate-passes` will avoid pre-populate the LLVM pass
   manager with a list of passes.  This will allow you to view the LLVM
   IR that rustc generates, not the LLVM IR after optimizations.
-- The `-Cpasses=val` option allows you to supply a space separated list of extra LLVM passes to run
+- The `-C passes=val` option allows you to supply a space separated list of extra LLVM passes to run
-- The `-Csave-temps` option saves all temporary output files during compilation
+- The `-C save-temps` option saves all temporary output files during compilation
-- The `-Zprint-llvm-passes` option will print out LLVM optimization passes being run
+- The `-Z print-llvm-passes` option will print out LLVM optimization passes being run
-- The `-Ztime-llvm-passes` option measures the time of each LLVM pass
+- The `-Z time-llvm-passes` option measures the time of each LLVM pass
-- The `-Zverify-llvm-ir` option will verify the LLVM IR for correctness
+- The `-Z verify-llvm-ir` option will verify the LLVM IR for correctness
-- The `-Zno-parallel-llvm` will disable parallel compilation of distinct compilation units
+- The `-Z no-parallel-llvm` will disable parallel compilation of distinct compilation units
-- The `-Zllvm-time-trace` option will output a Chrome profiler compatible JSON file
+- The `-Z llvm-time-trace` option will output a Chrome profiler compatible JSON file
   which contains details and timings for LLVM passes.
 
 ### Filing LLVM bug reports

src/closure.md

@@ -32,10 +32,10 @@ fn main() {
 ```
 
 Let's say the above is the content of a file called `immut.rs`. If we compile
-`immut.rs` using the following command. The [`-Zdump-mir=all`][dump-mir] flag will cause
+`immut.rs` using the following command. The [`-Z dump-mir=all`][dump-mir] flag will cause
 `rustc` to generate and dump the [MIR][mir] to a directory called `mir_dump`.
 ```console
-> rustc +stage1 immut.rs -Zdump-mir=all
+> rustc +stage1 immut.rs -Z dump-mir=all
 ```
 
 [mir]: ./mir/index.md
@@ -146,7 +146,7 @@ codebase. For closures specifically, set the `RUST_LOG` env variable as below an
 output in a file:
 
 ```console
-> RUST_LOG=rustc_typeck::check::upvar rustc +stage1 -Zdump-mir=all \
+> RUST_LOG=rustc_typeck::check::upvar rustc +stage1 -Z dump-mir=all \
     <.rs file to compile> 2> <file where the output will be dumped>
 ```
 

src/compiler-debugging.md

@@ -82,28 +82,31 @@ For example:
 
 ```bash
 $ cat error.rs
+```
+
+```rust
 fn main() {
     1 + ();
 }
 ```
 
 ```bash
-$ ./build/x86_64-unknown-linux-gnu/stage1/bin/rustc error.rs
+$ rustc +stage1 error.rs
-error[E0277]: the trait bound `{integer}: std::ops::Add<()>` is not satisfied
+error[E0277]: cannot add `()` to `{integer}`
  --> error.rs:2:7
   |
 2 |       1 + ();
   |         ^ no implementation for `{integer} + ()`
   |
-  = help: the trait `std::ops::Add<()>` is not implemented for `{integer}`
+  = help: the trait `Add<()>` is not implemented for `{integer}`
 
 error: aborting due to previous error
+```
 
-$ # Now, where does the error above come from?
+Now, where does the error above come from?
-$ RUST_BACKTRACE=1 \
+
-    ./build/x86_64-unknown-linux-gnu/stage1/bin/rustc \
+```bash
-    error.rs \
+$ RUST_BACKTRACE=1 rustc +stage1 error.rs -Z treat-err-as-bug
-    -Z treat-err-as-bug
 error[E0277]: the trait bound `{integer}: std::ops::Add<()>` is not satisfied
  --> error.rs:2:7
   |
@@ -140,9 +143,10 @@ stack backtrace:
   (~~~ IRRELEVANT PART OF BACKTRACE REMOVED BY ME ~~~)
   36: rustc_driver::run_compiler
              at /home/user/rust/compiler/rustc_driver/src/lib.rs:253
-$ # Cool, now I have a backtrace for the error
 ```
 
+Cool, now I have a backtrace for the error!
+
 ## Getting logging output
 [getting-logging-output]: #getting-logging-output
 
@@ -180,16 +184,16 @@ So to put it together.
 ```bash
 # This puts the output of all debug calls in `rustc_middle/src/traits` into
 # standard error, which might fill your console backscroll.
-$ RUSTC_LOG=rustc_middle::traits rustc +local my-file.rs
+$ RUSTC_LOG=rustc_middle::traits rustc +stage1 my-file.rs
 
 # This puts the output of all debug calls in `rustc_middle/src/traits` in
 # `traits-log`, so you can then see it with a text editor.
-$ RUSTC_LOG=rustc_middle::traits rustc +local my-file.rs 2>traits-log
+$ RUSTC_LOG=rustc_middle::traits rustc +stage1 my-file.rs 2>traits-log
 
 # Not recommended. This will show the output of all `debug!` calls
 # in the Rust compiler, and there are a *lot* of them, so it will be
 # hard to find anything.
-$ RUSTC_LOG=debug rustc +local my-file.rs 2>all-log
+$ RUSTC_LOG=debug rustc +stage1 my-file.rs 2>all-log
 
 # This will show the output of all `info!` calls in `rustc_trans`.
 #
@@ -198,13 +202,13 @@ $ RUSTC_LOG=debug rustc +local my-file.rs 2>all-log
 # which function triggers an LLVM assertion, and this is an `info!`
 # log rather than a `debug!` log so it will work on the official
 # compilers.
-$ RUSTC_LOG=rustc_trans=info rustc +local my-file.rs
+$ RUSTC_LOG=rustc_trans=info rustc +stage1 my-file.rs
 
 # This will show the output of all `info!` calls made by rustdoc or any rustc library it calls.
-$ RUSTDOC_LOG=info rustdoc +local my-file.rs
+$ RUSTDOC_LOG=info rustdoc +stage1 my-file.rs
 
 # This will only show `debug!` calls made by rustdoc directly, not any `rustc*` crate.
-$ RUSTDOC_LOG=rustdoc rustdoc +local my-file.rs
+$ RUSTDOC_LOG=rustdoc rustdoc +stage1 my-file.rs
 ```
 
 ### How to keep or remove `debug!` and `trace!` calls from the resulting binary
@@ -271,7 +275,7 @@ In addition to [graphviz output](#formatting-graphviz-output-dot-files), MIR deb
 flags include an option to generate a MIR representation called `Spanview` that
 uses HTML to highlight code regions in the original source code and display
 compiler metadata associated with each region.
-[`-Zdump-mir-spanview`](./mir/debugging.md), for example, highlights spans
+[`-Z dump-mir-spanview`](./mir/debugging.md), for example, highlights spans
 associated with each MIR `Statement`, `Terminator`, and/or `BasicBlock`.
 
 These `.html` files use CSS features to dynamically expand spans obscured by

src/diagnostics.md

@@ -263,7 +263,7 @@ There are two main ways to find where a given error is emitted:
   the error emitting code is removed from the code where the error is
   constructed behind a relatively deep call-stack. Even then, it is a good way
   to get your bearings.
-- Invoking `rustc` with the nightly-only flag `-Ztreat-err-as-bug=1`, which
+- Invoking `rustc` with the nightly-only flag `-Z treat-err-as-bug=1`, which
   will treat the first error being emitted as an Internal Compiler Error, which
   allows you to use the environment variable `RUST_BACKTRACE=full` to get a
   stack trace at the point the error has been emitted. Change the `1` to

src/hir-debugging.md

@@ -1,6 +1,6 @@
 # HIR Debugging
 
-The `-Zunpretty=hir-tree` flag will dump out the HIR.
+The `-Z unpretty=hir-tree` flag will dump out the HIR.
 
 If you are trying to correlate `NodeId`s or `DefId`s with source code, the
 `--pretty expanded,identified` flag may be useful.

src/hir.md

@@ -12,10 +12,10 @@ the HIR. This makes HIR more amenable to analysis than a normal AST.
 This chapter covers the main concepts of the HIR.
 
 You can view the HIR representation of your code by passing the
-`-Zunpretty=hir-tree` flag to rustc:
+`-Z unpretty=hir-tree` flag to rustc:
 
 ```bash
-cargo rustc -- -Zunpretty=hir-tree
+cargo rustc -- -Z unpretty=hir-tree
 ```
 
 ### Out-of-band storage and the `Crate` type

src/llvm-coverage-instrumentation.md

@@ -496,8 +496,8 @@ An visual, interactive representation of the final `CoverageSpan`s can be
 generated with the following `rustc` flags:
 
 ```shell
-$ rustc -Zinstrument-coverage -Zdump-mir=InstrumentCoverage \
+$ rustc -Z instrument-coverage -Z dump-mir=InstrumentCoverage \
-    -Zdump-mir-spanview some_rust_source.rs
+    -Z dump-mir-spanview some_rust_source.rs
 ```
 
 These flags request Spanview output for the `InstrumentCoverage` pass, and the

src/mir/dataflow.md

@@ -201,8 +201,8 @@ for (bb, block) in body.basic_blocks().iter_enumerated() {
 ### Graphviz Diagrams
 
 When the results of a dataflow analysis are not what you expect, it often helps
-to visualize them. This can be done with the `-Zdump-mir` flags described in
+to visualize them. This can be done with the `-Z dump-mir` flags described in
-[Debugging MIR]. Start with `-Zdump-mir=F -Zdump-mir-dataflow`, where `F` is
+[Debugging MIR]. Start with `-Z dump-mir=F -Z dump-mir-dataflow`, where `F` is
 either "all" or the name of the MIR body you are interested in.
 
 These `.dot` files will be saved in your `mir_dump` directory and will have the

src/mir/debugging.md

@@ -1,26 +1,26 @@
 # MIR Debugging
 
-The `-Zdump-mir` flag can be used to dump a text representation of the MIR.
+The `-Z dump-mir` flag can be used to dump a text representation of the MIR.
-The following optional flags, used in combination with `-Zdump-mir`, enable
+The following optional flags, used in combination with `-Z dump-mir`, enable
 additional output formats, including:
 
-* `-Zdump-mir-graphviz` - dumps a `.dot` file that represents MIR as a
+* `-Z dump-mir-graphviz` - dumps a `.dot` file that represents MIR as a
 control-flow graph
-* `-Zdump-mir-dataflow` - dumps a `.dot` file showing the [dataflow state] at
+* `-Z dump-mir-dataflow` - dumps a `.dot` file showing the [dataflow state] at
   each point in the control-flow graph
-* `-Zdump-mir-spanview` - dumps an `.html` file that highlights the source
+* `-Z dump-mir-spanview` - dumps an `.html` file that highlights the source
 spans associated with MIR elements (including mouse-over actions to reveal
 elements obscured by overlaps, and tooltips to view the MIR statements).
 This flag takes an optional value: `statement` (the default), `terminator`, or
 `block`, to generate span highlights with different levels of granulatity.
 
-`-Zdump-mir=F` is a handy compiler options that will let you view the MIR for
+`-Z dump-mir=F` is a handy compiler options that will let you view the MIR for
-each function at each stage of compilation. `-Zdump-mir` takes a **filter** `F`
+each function at each stage of compilation. `-Z dump-mir` takes a **filter** `F`
 which allows you to control which functions and which passes you are
 interesting in. For example:
 
 ```bash
-> rustc -Zdump-mir=foo ...
+> rustc -Z dump-mir=foo ...
 ```
 
 This will dump the MIR for any function whose name contains `foo`; it
@@ -34,7 +34,7 @@ fn main() {
     println!("Hello, world!");
 }
 ^D
-> rustc -Zdump-mir=main foo.rs
+> rustc -Z dump-mir=main foo.rs
 > ls mir_dump/* | wc -l
      161
 ```
@@ -56,7 +56,7 @@ will select for things that reference *both* `main` and the pass
 `CleanEndRegions`:
 
 ```bash
-> rustc -Zdump-mir='main & CleanEndRegions' foo.rs
+> rustc -Z dump-mir='main & CleanEndRegions' foo.rs
 > ls mir_dump
 rustc.main.000-000.CleanEndRegions.after.mir	rustc.main.000-000.CleanEndRegions.before.mir
 ```
@@ -67,7 +67,7 @@ NoLandingPads` will select *either* `main` and `CleanEndRegions` *or*
 `main` and `NoLandingPads`:
 
 ```bash
-> rustc -Zdump-mir='main & CleanEndRegions | main & NoLandingPads' foo.rs
+> rustc -Z dump-mir='main & CleanEndRegions | main & NoLandingPads' foo.rs
 > ls mir_dump
 rustc.main-promoted[0].002-000.NoLandingPads.after.mir
 rustc.main-promoted[0].002-000.NoLandingPads.before.mir

src/notification-groups/llvm.md

@@ -22,8 +22,8 @@ The ["Debugging LLVM"][d] section of the
 rustc-dev-guide gives a step-by-step process for how to help debug bugs
 caused by LLVM. In particular, it discusses how to emit LLVM IR, run
 the LLVM IR optimization pipelines, and so forth. You may also find
-it useful to look at the various codegen options listed under `-Chelp`
+it useful to look at the various codegen options listed under `-C help`
-and the internal options under `-Zhelp` -- there are a number that
+and the internal options under `-Z help` -- there are a number that
 pertain to LLVM (just search for LLVM).
 
 [d]: ../backend/debugging.md

src/overview.md

@@ -330,7 +330,7 @@ For more details on bootstrapping, see
 
 - Does LLVM ever do optimizations in debug builds?
 - How do I explore phases of the compile process in my own sources (lexer,
-  parser, HIR, etc)? - e.g., `cargo rustc -- -Zunpretty=hir-tree` allows you to
+  parser, HIR, etc)? - e.g., `cargo rustc -- -Z unpretty=hir-tree` allows you to
   view HIR representation
 - What is the main source entry point for `X`?
 - Where do phases diverge for cross-compilation to machine code across
@@ -363,7 +363,7 @@ For more details on bootstrapping, see
   - Guide: [Identifiers in the HIR](https://rustc-dev-guide.rust-lang.org/hir.html#identifiers-in-the-hir)
   - Guide: [The HIR Map](https://rustc-dev-guide.rust-lang.org/hir.html#the-hir-map)
   - Guide: [Lowering AST to HIR](https://rustc-dev-guide.rust-lang.org/lowering.html)
-  - How to view HIR representation for your code `cargo rustc -- -Zunpretty=hir-tree`
+  - How to view HIR representation for your code `cargo rustc -- -Z unpretty=hir-tree`
   - Rustc HIR definition: [`rustc_hir`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/index.html)
   - Main entry point: **TODO**
   - Late linting: **TODO**

src/profile-guided-optimization.md

@@ -54,11 +54,11 @@ coverage results for PGO has not been attempted at this time.
 
 Generating a PGO-optimized program involves the following four steps:
 
-1. Compile the program with instrumentation enabled (e.g. `rustc -Cprofile-generate main.rs`)
+1. Compile the program with instrumentation enabled (e.g. `rustc -C profile-generate main.rs`)
 2. Run the instrumented program (e.g. `./main`) which generates a `default-<id>.profraw` file
 3. Convert the `.profraw` file into a `.profdata` file using LLVM's `llvm-profdata` tool.
 4. Compile the program again, this time making use of the profiling data
-   (e.g. `rustc -Cprofile-use=merged.profdata main.rs`)
+   (e.g. `rustc -C profile-use=merged.profdata main.rs`)
 
 ### Compile-Time Aspects
 

src/profiling.md

@@ -8,7 +8,7 @@ Depending on what you're trying to measure, there are several different approach
   - The [rustc-perf](https://github.com/rust-lang/rustc-perf) project makes this easy and can be triggered to run on a PR via the `@rustc-perf` bot.
 
 - If you want a medium-to-high level overview of where `rustc` is spending its time:
-  - The `-Zself-profile` flag and [measureme](https://github.com/rust-lang/measureme) tools offer a query-based approach to profiling.
+  - The `-Z self-profile` flag and [measureme](https://github.com/rust-lang/measureme) tools offer a query-based approach to profiling.
     See [their docs](https://github.com/rust-lang/measureme/blob/master/summarize/Readme.md) for more information.
 
 - If you want function level performance data or even just more details than the above approaches:
@@ -17,9 +17,9 @@ Depending on what you're trying to measure, there are several different approach
     full-featured graphical interface.
 
 - If you want a nice visual representation of the compile times of your crate graph,
-  you can use [cargo's `-Ztimings` flag](https://doc.rust-lang.org/cargo/reference/unstable.html#timings), 
+  you can use [cargo's `-Z timings` flag](https://doc.rust-lang.org/cargo/reference/unstable.html#timings),
-  eg. `cargo -Ztimings build`.
+  eg. `cargo -Z timings build`.
-  You can use this flag on the compiler itself with `CARGOFLAGS="-Ztimings" ./x.py build`
+  You can use this flag on the compiler itself with `CARGOFLAGS="-Z timings" ./x.py build`
 
 ## Optimizing rustc's bootstrap times with `cargo-llvm-lines`
 
@@ -88,7 +88,7 @@ codegen-units = 0  # num_cpus
 The llvm-lines output is affected by several options.
 `optimize = false` increases it from 2.1GB to 3.5GB and `codegen-units = 0` to 4.1GB.
 
-MIR optimizations have little impact. Compared to the default `RUSTFLAGS="-Zmir-opt-level=1"`,
+MIR optimizations have little impact. Compared to the default `RUSTFLAGS="-Z mir-opt-level=1"`,
 level 0 adds 0.3GB and level 2 removes 0.2GB.
 Inlining currently only happens in LLVM, but this might change in the future.
 

src/profiling/with_perf.md

@@ -150,7 +150,7 @@ the `cargo rustc` command, like so:
 
 ```bash
 touch src/lib.rs
-CARGO_INCREMENTAL=0 perf record -F99 --call-graph dwarf cargo rustc --profile check --lib -- -Zborrowck=mir
+CARGO_INCREMENTAL=0 perf record -F99 --call-graph dwarf cargo rustc --profile check --lib -- -Z borrowck=mir
 ```
 
 [pf]: https://github.com/nikomatsakis/perf-focus

src/sanitizers.md

@@ -11,7 +11,7 @@ The rustc compiler contains support for following sanitizers:
 
 ## How to use the sanitizers?
 
-To enable a sanitizer compile with `-Zsanitizer=...` option, where value is one
+To enable a sanitizer compile with `-Z sanitizer=...` option, where value is one
 of `address`, `leak`, `memory` or `thread`. For more details how to use
 sanitizers please refer to [the unstable book](https://doc.rust-lang.org/unstable-book/).
 
@@ -49,7 +49,7 @@ libraries. Highlight of the most important aspects of the implementation:
 *  When producing an executable, the sanitizer specific runtime library is
    [linked in][sanitizer-link]. The libraries are searched for in target libdir
    relative to default system root, so that this process is not affected
-   by sysroot overrides used for example by cargo `-Zbuild-std` functionality.
+   by sysroot overrides used for example by cargo `-Z build-std` functionality.
 
 [compiler-rt]: https://github.com/llvm/llvm-project/tree/master/compiler-rt
 [sanitizer-build]: https://github.com/rust-lang/rust/blob/a29424a2265411dda7d7446516ac5fd7499e2b55/src/bootstrap/native.rs#L566-L624

src/stability.md

@@ -129,9 +129,9 @@ default `allow`, but most of the standard library raises it to a warning with
 
 [`deprecated` attribute]: https://doc.rust-lang.org/reference/attributes/diagnostics.html#the-deprecated-attribute
 
-## -Zforce-unstable-if-unmarked
+## -Z force-unstable-if-unmarked
 
-The `-Zforce-unstable-if-unmarked` flag has a variety of purposes to help
+The `-Z force-unstable-if-unmarked` flag has a variety of purposes to help
 enforce that the correct crates are marked as unstable. It was introduced
 primarily to allow rustc and the standard library to link to arbitrary crates
 on crates.io which do not themselves use `staged_api`. `rustc` also relies on
@@ -152,9 +152,9 @@ This flag has the following effects:
   attribute to use other unstable crates. However, that would make it
   impossible for a crate from crates.io to access its own dependencies since
   that crate won't have a `feature(rustc_private)` attribute, but *everything*
-  is compiled with `-Zforce-unstable-if-unmarked`.
+  is compiled with `-Z force-unstable-if-unmarked`.
 
-Code which does not use `-Zforce-unstable-if-unmarked` should include the
+Code which does not use `-Z force-unstable-if-unmarked` should include the
 `#![feature(rustc_private)]` crate attribute to access these force-unstable
 crates. This is needed for things that link `rustc`, such as `miri`, `rls`, or
 `clippy`.

src/tests/adding.md

@@ -109,7 +109,7 @@ to specify a custom flag to give to rustc when the test is compiled:
 ```rust,ignore
 // Test the behavior of `0 - 1` when overflow checks are disabled.
 
-// compile-flags: -Coverflow-checks=off
+// compile-flags: -C overflow-checks=off
 
 fn main() {
     let x = 0 - 1;