# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
+load("//:workspace_root.bzl", "workspace_root")
load("//llvm:tblgen.bzl", "gentbl")
load("//llvm:binary_alias.bzl", "binary_alias")
load("//llvm:cc_plugin_library.bzl", "cc_plugin_library")
],
)
+workspace_root(name = "workspace_root")
+
cc_library(
name = "ast",
srcs = glob([
# least bad approach. Using `includes` is *specifically* problematic for
# this library because it contains files that collide easily with system
# headers such as `CXXABI.h`.
- "-I$(GENDIR)/external/llvm-project/clang/lib/AST",
- "-I$(GENDIR)/external/llvm-project/clang/lib/AST/Interp",
+ "-I$(GENDIR)/$(WORKSPACE_ROOT)/clang/lib/AST",
+ "-I$(GENDIR)/$(WORKSPACE_ROOT)/clang/lib/AST/Interp",
],
textual_hdrs = [
"include/clang/AST/AttrImpl.inc",
] + glob([
"include/clang/AST/*.def",
]),
+ toolchains = [
+ ":workspace_root",
+ ],
deps = [
":ast_attr_gen",
":ast_comment_command_info_gen",
outs = [hdr.replace("lib/Headers/", "staging/include/") for hdr in builtin_headers],
cmd = """
for src in $(SRCS); do
- relsrc=$${src/*external\\/llvm-project\\/clang\\/lib\\/Headers\\/}
+ relsrc=$${src/*"$(WORKSPACE_ROOT)"\\/clang\\/lib\\/Headers}
target=$(@D)/staging/include/$$relsrc
mkdir -p $$(dirname $$target)
cp $$src $$target
done""",
output_to_bindir = 1,
+ toolchains = [
+ ":workspace_root",
+ ],
)
cc_library(
--- /dev/null
+def _workspace_root_impl(ctx):
+ """Dynamically determine the workspace root from the current context.
+
+ The path is made available as a `WORKSPACE_ROOT` environmment variable and
+ may for instance be consumed in the `toolchains` attributes for `cc_library`
+ and `genrule` targets.
+ """
+ return [
+ platform_common.TemplateVariableInfo({
+ "WORKSPACE_ROOT": ctx.label.workspace_root,
+ }),
+ ]
+
+workspace_root = rule(
+ implementation = _workspace_root_impl,
+ attrs = {},
+)