//build/toolchain/musl-host-gcc: implement
This is a cc_toolchain which runs on x86 systems with Linux/gcc and
targets Smalltown via static musl builds.
It is currently unused, but can be tested by trying to build any
cc_binary with
--crosstool_top=//build/toolchain/musl-host-gcc:musl_host_cc_suite .
Test Plan: This has been tested manually by running it against a simple cc_binary. Another revision on top of this will attempt to build mkfs.xfs with it.
X-Origin-Diff: phab/D623
GitOrigin-RevId: ebdf51ee76d9d5a7fd94725c66ef53783f787df7
diff --git a/build/toolchain/musl-host-gcc/sysroot/musl.bzl b/build/toolchain/musl-host-gcc/sysroot/musl.bzl
new file mode 100644
index 0000000..5055b83
--- /dev/null
+++ b/build/toolchain/musl-host-gcc/sysroot/musl.bzl
@@ -0,0 +1,44 @@
+# Copyright 2020 The Monogon Project Authors.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load(
+ "//build/utils:detect_root.bzl",
+ "detect_root",
+)
+
+def _musl_headers(ctx):
+ hdrs_name = ctx.attr.name + "_headers"
+ hdrs_dir = ctx.actions.declare_directory(hdrs_name)
+
+ root = detect_root(ctx.attr.src)
+ ctx.actions.run_shell(
+ inputs = ctx.files.src,
+ outputs = [hdrs_dir],
+ progress_message = "Collecting musl headers",
+ mnemonic = "MuslCollectHeaders",
+ arguments = [root, ctx.attr.arch, hdrs_dir.path],
+ use_default_shell_env = True,
+ command = "make -C \"$1\" install-headers ARCH=\"$2\" includedir=\"$(pwd)/$3\" > /dev/null",
+ )
+ return [DefaultInfo(files=depset([hdrs_dir]))]
+
+musl_headers = rule(
+ implementation = _musl_headers,
+ attrs = {
+ "src": attr.label(mandatory = True),
+ "arch": attr.string(mandatory = True),
+ },
+)