issue-130 copy contents related x.py from rust-forge

Author: Rajkumar Natarajan

src/build-install-distribution-artifacts.md

@@ -0,0 +1,27 @@
+# Build distribution artifacts
+
+You might want to build and package up the compiler for distribution.
+You’ll want to run this command to do it:
+
+   `./x.py dist`
+
+Other Flags
+
+The same flags from build are available here. 
+You might want to consider adding on the -j flag for faster builds 
+when building a distribution artifact.
+
+```
+-j, --jobs JOBS     number of jobs to run in parallel
+```
+
+
+# Install distribution artifacts
+
+If you’ve built a distribution artifact you might want to install it and 
+test that it works on your target system. You’ll want to run this command:
+
+   `./x.py install`
+
+Other Flags
+The same flags from build are available 

src/compiler-benchmarking.md

@@ -0,0 +1,11 @@
+# Benchmarking rustc
+
+This one is a easier compared to the others. 
+All you’re doing is running benchmarks of the compiler itself 
+so it’ll build it and run the one set of benchmarks available to it. 
+The command is:
+
+   `./x.py bench`
+
+Benchmarking lacks `--no-fail-fast` flag that `test` command has.
+   

src/compiler-documenting.md

@@ -0,0 +1,49 @@
+# Documenting rustc
+
+You might want to build documentation of the various components 
+available like the standard library. There’s two ways to go about this.
+ You can run rustdoc directly on the file to make sure the HTML is 
+ correct which is fast or you can build the documentation as part of the 
+ build process through x.py. Both are viable methods since documentation 
+ is more about the content.
+
+## Document everything
+
+   `./x.py doc`
+
+## If you want to avoid the whole Stage 2 build
+
+   `./x.py doc --stage 1`
+
+First the compiler and rustdoc get built to make sure everything is okay 
+and then it documents the files.
+
+## Document specific components
+
+```bash
+   ./x.py doc src/doc/book
+   ./x.py doc src/doc/nomicon
+   ./x.py doc src/doc/book src/libstd
+```
+
+Much like individual tests or building certain components you can build only
+ the documentation you want.
+
+## Document internal rustc items
+By default rustc does not build the compiler docs for its internal items. 
+Mostly because this is useless for the average user. However, you might need 
+to have it available so you can understand the types. Here’s how you can 
+compile it yourself. From the top level directory where x.py is located run:
+
+    cp config.toml.example config.toml
+
+Next open up config.toml and make sure these two lines are set to true:
+
+docs = true
+compiler-docs = true
+When you want to build the compiler docs as well run this command:
+
+   `./x.py doc`
+
+This will see that the docs and compiler-docs options are set to true 
+and build the normally hidden compiler docs!

src/how-to-build-and-run.md

@@ -110,6 +110,44 @@ This is just a subset of the full rustc build. The **full** rustc build
 - Build libstd with stage2 compiler.
 - Build librustdoc and a bunch of other things.
 
+### Build different stages
+
+  `./x.py build --stage 0`
+
+  # Stage 1 is typically enough to test out all of your changes
+  # to the compiler
+    
+  `./x.py build --stage 1`
+
+  # Equivalent to ./x.py build
+    
+  `./x.py build --stage 2`
+
+You can pass the --stage flag with what stage you want to build to. 
+It is recommended that you build to Stage 1 as this is enough to know 
+your changes can successfully compile and should let you run tests 
+with your changes.
+
+### Build specific components
+
+   Build only the libcore library
+
+   `./x.py build src/libcore`
+
+   Build the libcore and libproc_macro library only
+
+   `./x.py build src/libcore src/libproc_macro`
+
+   Build only libcore up to Stage 1
+
+   `./x.py build src/libcore --stage 1`
+
+Sometimes you might just want to test if the part you’re working on can 
+compile. Using these commands you can test that it compiles before doing 
+a bigger build to make sure it works with the compiler. As shown before 
+you can also pass flags at the end such as --stage.
+
+
 ### Creating a rustup toolchain
 
 Once you have successfully built rustc, you will have created a bunch
@@ -121,8 +159,8 @@ you will likely need to build at some point; for example, if you want
 to run the entire test suite).
 
 ```bash
-> rustup toolchain link stage1 build/<host-triple>/stage1
-> rustup toolchain link stage2 build/<host-triple>/stage2
+  rustup toolchain link stage1 build/<host-triple>/stage1
+  rustup toolchain link stage2 build/<host-triple>/stage2
 ```
 
 Now you can run the rustc you built with. If you run with `-vV`, you
@@ -173,3 +211,12 @@ This allows you to do "jump-to-def" with whatever functions were around when
 you last built, which is ridiculously useful.
 
 [etags]: https://github.com/nikomatsakis/rust-etags
+
+### Cleaning out build directories
+
+Sometimes you need to start fresh, but this is normally not the case. 
+If you need to run this then rustbuild is most likely not acting right and 
+you should file a bug as to what is going wrong. If you do need to clean 
+everything up then you only need to run one command!
+
+   `./x.py clean`

src/tests/running.md

@@ -70,3 +70,26 @@ This is much faster, but doesn't always work. For example, some tests
 include directives that specify specific compiler flags, or which rely
 on other crates, and they may not run the same without those options.
 
+### Run specific tests
+
+# Run only the tidy script
+```bash
+> ./x.py test src/tools/tidy
+```
+# Run tests on the standard library
+```bash
+> ./x.py test src/libstd
+```
+
+# Run tests on the standard library and run the tidy script
+```bash
+> ./x.py test src/libstd src/tools/tidy
+```
+
+# Run tests on the standard library using a stage 1 compiler
+```bash
+>   ./x.py test src/libstd --stage 1
+```
+
+By listing which test suites you want to run you avoid having to run tests for 
+components you did not change at all.

src/what-is-x-py.md

@@ -0,0 +1,42 @@
+# what is x.py?
+
+x.py is the script used to orchestrate the tooling in the rustc repository. 
+It is the script that can build docs, run tests, and compile rustc. 
+It is the now preferred way to build rustc and it replaces the old makefiles 
+from before. Below are the different ways to utilize x.py in order to 
+effectively deal with the repo for various common tasks.
+
+### Build Flags
+
+There are other flags you can pass to the build portion of x.py that can be 
+beneficial to cutting down compile times or fitting other things you might 
+need to change. They are:
+
+```
+Options:
+    -v, --verbose       use verbose output (-vv for very verbose)
+    -i, --incremental   use incremental compilation
+        --config FILE   TOML configuration file for build
+        --build BUILD   build target of the stage0 compiler
+        --host HOST     host targets to build
+        --target TARGET target targets to build
+        --on-fail CMD   command to run on failure
+        --stage N       stage to build
+        --keep-stage N  stage to keep without recompiling
+        --src DIR       path to the root of the rust checkout
+    -j, --jobs JOBS     number of jobs to run in parallel
+    -h, --help          print this help message
+```
+
+Note that the options --incremental, --keep-stage 0 and --jobs JOBS can be 
+used in tandem with --stage to help reduce build times significantly by 
+reusing already built components, reusing the first bootstrapped stage, and 
+running compilation in parallel. To test changes you could run something like:
+
+```bash
+   ./x.py build --stage 1 --keep-stage 0 -j 4 -i
+```
+
+Please follow the links to build, document, test, benchmark and install 
+distribution
+ artifacts for rustc respectively.