Merge pull request #10 from buildbuddy-io/musl

Do the simplest thing to build with musl

Author: tylerwilliams

.bazelrc

@@ -89,7 +89,7 @@ build:java21 --tool_java_runtime_version=remotejdk_21
 import %workspace%/tools/javacopts.bazelrc
 
 # For release, stamp binaries, use optimized mode w/ minimum line table debugging.
-build:release --stamp -c opt --copt=-gmlt
+build:release --stamp -c opt
 
 # Use the RBE instance in the kythe-repo project
 build:remote --remote_instance_name=projects/kythe-repo/instances/default_instance --bes_instance_name=kythe-repo
@@ -124,6 +124,10 @@ build:remote --repo_env=KYTHE_DO_NOT_DETECT_BAZEL_TOOLCHAINS=1
 build:remote --extra_toolchains=//tools/build_rules/lexyacc:lexyacc_remote_toolchain
 build:remote --extra_toolchains=//tools/build_rules/external_tools:external_tools_remote_toolchain
 
+# Build fully static binaries linked against musl on Linux.
+common:static --platforms=//platforms:linux_x86_64_musl
+common:static-arm64 --platforms=//platforms:linux_arm64_musl
+
 build:remote --action_env=LEIN_JAVA_CMD=
 
 build:prepush --verbose_failures --noshow_loading_progress --noshow_progress

WORKSPACE

@@ -109,3 +109,21 @@ git_repository(
     commit = "133d89a6069ce253a92d32a93fdb7db9ef100e9d",
     remote = "https://github.com/erenon/bazel_clang_tidy.git",
 )
+
+http_archive(
+    name = "musl_toolchains",
+    sha256 = "26cacffab74e10f0840c83b0be9193dc6deccfbc8ec1cf6f8362dc61d0057fa1",
+    url = "https://github.com/bazel-contrib/musl-toolchain/releases/download/v0.1.15/musl_toolchain-v0.1.15.tar.gz",
+)
+
+load("@musl_toolchains//:repositories.bzl", "load_musl_toolchains")
+
+load_musl_toolchains(
+    extra_target_compatible_with = [
+        "@//toolchains:musl_on",
+    ],
+)
+
+load("@musl_toolchains//:toolchains.bzl", "register_musl_toolchains")
+
+register_musl_toolchains()

platforms/BUILD

@@ -0,0 +1,23 @@
+package(default_visibility = ["//visibility:public"])
+
+# Target this platforms with --platforms for a static build linked against musl libc.
+# Only meant to be used as a target platform.
+platform(
+    name = "linux_x86_64_musl",
+    constraint_values = [
+        "@platforms//cpu:x86_64",
+        "@platforms//os:linux",
+        "//toolchains:musl_on",
+    ],
+)
+
+# Target this platforms with --platforms for a static build linked against musl libc.
+# Only meant to be used as a target platform.
+platform(
+    name = "linux_arm64_musl",
+    constraint_values = [
+        "@platforms//cpu:arm64",
+        "@platforms//os:linux",
+        "//toolchains:musl_on",
+    ],
+)

toolchains/BUILD

@@ -0,0 +1,23 @@
+constraint_setting(
+    name = "use_musl",
+    default_constraint_value = ":musl_off",
+    visibility = [
+        "//visibility:public",
+    ],
+)
+
+constraint_value(
+    name = "musl_on",
+    constraint_setting = ":use_musl",
+    visibility = [
+        "//visibility:public",
+    ],
+)
+
+constraint_value(
+    name = "musl_off",
+    constraint_setting = ":use_musl",
+    visibility = [
+        "//visibility:public",
+    ],
+)