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# This file is licensed under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
"""Helper macros to configure the LLVM overlay project."""
load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe")
load(":zlib.bzl", "llvm_zlib_disable", "llvm_zlib_system")
load(":terminfo.bzl", "llvm_terminfo_disable", "llvm_terminfo_system")
# Directory of overlay files relative to WORKSPACE
DEFAULT_OVERLAY_PATH = "llvm-project-overlay"
DEFAULT_TARGETS = [
"AArch64",
"AMDGPU",
"ARM",
"AVR",
"BPF",
"Hexagon",
"Lanai",
"Mips",
"MSP430",
"NVPTX",
"PowerPC",
"RISCV",
"Sparc",
"SystemZ",
"VE",
"WebAssembly",
"X86",
"XCore",
]
def _overlay_directories(repository_ctx):
src_path = repository_ctx.path(Label("//:WORKSPACE")).dirname
bazel_path = src_path.get_child("utils").get_child("bazel")
overlay_path = bazel_path.get_child("llvm-project-overlay")
script_path = bazel_path.get_child("overlay_directories.py")
python_bin = repository_ctx.which("python3")
if not python_bin:
# Windows typically just defines "python" as python3. The script itself
# contains a check to ensure python3.
python_bin = repository_ctx.which("python")
if not python_bin:
fail("Failed to find python3 binary")
cmd = [
python_bin,
script_path,
"--src",
src_path,
"--overlay",
overlay_path,
"--target",
".",
]
exec_result = repository_ctx.execute(cmd, timeout = 20)
if exec_result.return_code != 0:
fail(("Failed to execute overlay script: '{cmd}'\n" +
"Exited with code {return_code}\n" +
"stdout:\n{stdout}\n" +
"stderr:\n{stderr}\n").format(
cmd = " ".join([str(arg) for arg in cmd]),
return_code = exec_result.return_code,
stdout = exec_result.stdout,
stderr = exec_result.stderr,
))
def _llvm_configure_impl(repository_ctx):
_overlay_directories(repository_ctx)
# Create a starlark file with the requested LLVM targets.
targets = repository_ctx.attr.targets
repository_ctx.file(
"llvm/targets.bzl",
content = "llvm_targets = " + str(targets),
executable = False,
)
llvm_configure = repository_rule(
implementation = _llvm_configure_impl,
local = True,
configure = True,
attrs = {
"targets": attr.string_list(default = DEFAULT_TARGETS),
},
)
def llvm_disable_optional_support_deps():
maybe(
llvm_zlib_disable,
name = "llvm_zlib",
)
maybe(
llvm_terminfo_disable,
name = "llvm_terminfo",
)
def llvm_use_system_support_deps():
maybe(
llvm_zlib_system,
name = "llvm_zlib",
)
maybe(
llvm_terminfo_system,
name = "llvm_terminfo",
)
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