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C++ Rules for Bazel
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rosica e02152f86e Remove fail("Unreachable") from features' and action_configs' declaration statements 
If toolchain A and B need feature f, but toolchain C doesn't, the generated declaration statement for feature f would be:
if ctx.attr.cpu == 'A.cpu':
   f = feature(...)
elif ctx.attr.cpu == "B.cpu" and ctx.attr.compiler == "B.compiler":
   f = feature(...)
else:
   fail("Unreachable")

This will break the rule implementation in the case of toolchain C because it will reach the  fail("Unreachable") although it doesn't need to declare feature f

This cl fixes that

Issue #5380

PiperOrigin-RevId: 232683639
 		2019-02-06 08:56:10 -08:00
.bazelci Add initial bazelci config for rules_cc 2019-01-11 00:05:29 -08:00
cc Add initial content of rules_cc repo 2019-01-09 08:58:14 +01:00
third_party Add a script for converting CROSSTOOL files to Starlark rules 2019-01-24 14:54:38 -08:00
tools/migration Remove fail("Unreachable") from features' and action_configs' declaration statements 2019-02-06 08:56:10 -08:00
.gitignore Add things needed for rules_cc to build & test in the open 2019-01-09 08:59:09 +01:00
BUILD Internal change 2019-01-09 08:56:00 +01:00
CODEOWNERS Add CODEOWNERS for rules_cc. 2019-02-05 02:22:15 -08:00
CONTRIBUTING.md Add initial content of rules_cc repo 2019-01-09 08:58:14 +01:00
LICENSE Internal change 2019-01-09 08:56:00 +01:00
README.md Fix rules_cc badge 2019-01-24 09:10:10 -08:00
WORKSPACE Add a script for converting CROSSTOOL files to Starlark rules 2019-01-24 14:54:38 -08:00

README.md

C++ rules for Bazel

Build status

This repository contains Starlark implementation of C++ rules in Bazel.

The rules are being incrementally converted from their native implementations in the Bazel source tree.

For the list of C++ rules, see the Bazel documentation.

Getting Started

There is no need to use rules from this repository just yet. If you want to use rules_cc anyway, add the following to your WORKSPACE file:

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
http_archive(
    name = "rules_cc",
    urls = ["https://github.com/bazelbuild/rules_cc/archive/TODO"],
    sha256 = "TODO",
)

Then, in your BUILD files, import and use the rules:

load("@rules_cc//cc:rules.bzl", "cc_library")
cc_library(
    ...
)

Migration Tools

This repository also contains migration tools that can be used to migrate your project for Bazel incompatible changes.

Legacy fields migrator

Script that migrates legacy crosstool fields into features (incompatible flag, tracking issue).

TLDR:

bazel run @rules_cc//tools/migration:legacy_fields_migrator -- \
  --input=my_toolchain/CROSSTOOL \
  --inline