gregestren

load("@bazel_skylib//rules:common_settings.bzl", "string_flag")

string_flag(
    name = "my_flag",
    build_setting_default = "",
)

config_setting(
    name = "apple",
    flag_values = {":my_flag": "apple"},

gregestren

#!/bin/bash
#
# Tests stripping config prefixes from output paths for better caching.
#
# What is this?
# -------------------
# Output paths are the paths of files created in a build. For example:
# "blaze-out/k8-fastbuild/bin/myproj/my.output".
#
# The config prefix is the "/k8-fastbuild/" part. That includes the CPU and

gregestren

query language parsing details

• The query language parses deps(//foo) as deps(WORD)

• review of WORD: https://bazel.build/query/language#expressions

• deps(//label with spaces) doesn't parse because //label with spaces isn't a WORD

• Quotes can solve this. From https://bazel.build/query/language#kind :

  Quotation of the pattern argument is often required because without it, many regular expressions, such as source file and .*_test, are not considered words by the parser.

gregestren

load("@bazel_skylib/rules:common_settings.bzl", "string_flag")
load("test.bzl", "test_rule")

string_flag(
    name = "myflag",
    build_setting_default = "a",
)

test_rule(name = "test")

gregestren

load("@bazel_skylib//rules:common_settings.bzl", "string_list_flag")
load("test.bzl", "test_rule")

string_list_flag(
    name = "string_list_flag",
    build_setting_default = ["default_orig"],
)

test_rule(
    name = "test",

gregestren

load(":defs.bzl", "my_rule", "my_toolchain")

# Declare a constraint value and an alias to it.
constraint_setting(name = "test_setting")

constraint_value(
    name = "actual_constraint",
    constraint_setting = ":test_setting",
)

gregestren

$ cat flagtest/defs.bzl
def _transition_impl(settings, attr):
    return {"//flagtest:other": "b"}

_transition = transition(
    implementation = _transition_impl,
    inputs = [],
    outputs = ["//flagtest:other"],
)