Add C++ toolchain configuration for OpenBSD.

In my limited testing, these changes appear to work. When I built Bazel on OpenBSD incorporating these changes, the resulting `bazel` binary could build C++ libraries and binaries. Likewise on FreeBSD.

This change, split out of the larger PR #10274, is part of the OpenBSD port in #10250.

Closes #10436.

PiperOrigin-RevId: 289091510

tools/cpp/BUILD.static.freebsd → tools/cpp/BUILD.static.bsd

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# This becomes the BUILD file for @local_config_cc// under FreeBSD.
+# This becomes the BUILD file for @local_config_cc// under FreeBSD and OpenBSD.
 
 package(default_visibility = ["//visibility:public"])
 
@@ -34,8 +34,10 @@ cc_toolchain_suite(
     toolchains = {
         "armeabi-v7a|compiler": ":cc-compiler-armeabi-v7a",
         "freebsd|compiler": ":cc-compiler-freebsd",
+        "openbsd|compiler": ":cc-compiler-openbsd",
         "armeabi-v7a": ":cc-compiler-armeabi-v7a",
         "freebsd": ":cc-compiler-freebsd",
+        "openbsd": ":cc-compiler-openbsd",
     },
 )
 
@@ -73,6 +75,40 @@ toolchain(
     toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
 )
 
+cc_toolchain(
+    name = "cc-compiler-openbsd",
+    all_files = ":empty",
+    ar_files = ":empty",
+    as_files = ":empty",
+    compiler_files = ":empty",
+    dwp_files = ":empty",
+    linker_files = ":empty",
+    objcopy_files = ":empty",
+    strip_files = ":empty",
+    supports_param_files = 0,
+    toolchain_config = ":local_openbsd",
+    toolchain_identifier = "local_openbsd",
+)
+
+cc_toolchain_config(
+    name = "local_openbsd",
+    cpu = "openbsd",
+)
+
+toolchain(
+    name = "cc-toolchain-openbsd",
+    exec_compatible_with = [
+        "@platforms//cpu:x86_64",
+        "@platforms//os:openbsd",
+    ],
+    target_compatible_with = [
+        "@platforms//cpu:x86_64",
+        "@platforms//os:openbsd",
+    ],
+    toolchain = ":cc-compiler-openbsd",
+    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
+)
+
 cc_toolchain(
     name = "cc-compiler-armeabi-v7a",
     all_files = ":empty",

tools/cpp/BUILD.tpl

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# This becomes the BUILD file for @local_config_cc// under non-FreeBSD unixes.
+# This becomes the BUILD file for @local_config_cc// under non-BSD unixes.
 
 package(default_visibility = ["//visibility:public"])
 

tools/cpp/freebsd_cc_toolchain_config.bzl → tools/cpp/bsd_cc_toolchain_config.bzl

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""A Starlark cc_toolchain configuration rule for freebsd."""
+"""A Starlark cc_toolchain configuration rule for FreeBSD and OpenBSD."""
 
 load(
     "@bazel_tools//tools/cpp:cc_toolchain_config_lib.bzl",
@@ -56,21 +56,22 @@ all_link_actions = [
 
 def _impl(ctx):
     cpu = ctx.attr.cpu
+    is_bsd = cpu == "freebsd" or cpu == "openbsd"
     compiler = "compiler"
-    toolchain_identifier = "local_freebsd" if cpu == "freebsd" else "stub_armeabi-v7a"
-    host_system_name = "local" if cpu == "freebsd" else "armeabi-v7a"
-    target_system_name = "local" if cpu == "freebsd" else "armeabi-v7a"
-    target_libc = "local" if cpu == "freebsd" else "armeabi-v7a"
-    abi_version = "local" if cpu == "freebsd" else "armeabi-v7a"
-    abi_libc_version = "local" if cpu == "freebsd" else "armeabi-v7a"
+    toolchain_identifier = "local_{}".format(cpu) if is_bsd else "stub_armeabi-v7a"
+    host_system_name = "local" if is_bsd else "armeabi-v7a"
+    target_system_name = "local" if is_bsd else "armeabi-v7a"
+    target_libc = "local" if is_bsd else "armeabi-v7a"
+    abi_version = "local" if is_bsd else "armeabi-v7a"
+    abi_libc_version = "local" if is_bsd else "armeabi-v7a"
 
     objcopy_embed_data_action = action_config(
         action_name = "objcopy_embed_data",
         enabled = True,
         tools = [tool(path = "/usr/bin/objcopy")],
     )
 
-    action_configs = [objcopy_embed_data_action] if cpu == "freebsd" else []
+    action_configs = [objcopy_embed_data_action] if is_bsd else []
 
     default_link_flags_feature = feature(
         name = "default_link_flags",
@@ -224,7 +225,7 @@ def _impl(ctx):
         ],
     )
 
-    if cpu == "freebsd":
+    if is_bsd:
         features = [
             default_compile_flags_feature,
             default_link_flags_feature,
@@ -240,12 +241,12 @@ def _impl(ctx):
     else:
         features = [supports_dynamic_linker_feature, supports_pic_feature]
 
-    if (cpu == "freebsd"):
+    if (is_bsd):
         cxx_builtin_include_directories = ["/usr/lib/clang", "/usr/local/include", "/usr/include"]
     else:
         cxx_builtin_include_directories = []
 
-    if cpu == "freebsd":
+    if is_bsd:
         tool_paths = [
             tool_path(name = "ar", path = "/usr/bin/ar"),
             tool_path(name = "compat-ld", path = "/usr/bin/ld"),

tools/cpp/cc_configure.bzl

@@ -102,18 +102,18 @@ def cc_autoconf_impl(repository_ctx, overriden_tools = dict()):
         ])
         repository_ctx.symlink(paths["@bazel_tools//tools/cpp:empty_cc_toolchain_config.bzl"], "cc_toolchain_config.bzl")
         repository_ctx.symlink(paths["@bazel_tools//tools/cpp:BUILD.empty"], "BUILD")
-    elif cpu_value == "freebsd":
+    elif cpu_value == "freebsd" or cpu_value == "openbsd":
         paths = resolve_labels(repository_ctx, [
-            "@bazel_tools//tools/cpp:BUILD.static.freebsd",
-            "@bazel_tools//tools/cpp:freebsd_cc_toolchain_config.bzl",
+            "@bazel_tools//tools/cpp:BUILD.static.bsd",
+            "@bazel_tools//tools/cpp:bsd_cc_toolchain_config.bzl",
         ])
 
-        # This is defaulting to a static crosstool, we should eventually
-        # autoconfigure this platform too.  Theorically, FreeBSD should be
-        # straightforward to add but we cannot run it in a docker container so
-        # skipping until we have proper tests for FreeBSD.
-        repository_ctx.symlink(paths["@bazel_tools//tools/cpp:freebsd_cc_toolchain_config.bzl"], "cc_toolchain_config.bzl")
-        repository_ctx.symlink(paths["@bazel_tools//tools/cpp:BUILD.static.freebsd"], "BUILD")
+        # This is defaulting to a static crosstool. We should eventually
+        # autoconfigure this platform too. Theorically, FreeBSD and OpenBSD
+        # should be straightforward to add but we cannot run them in a Docker
+        # container so skipping until we have proper tests for these platforms.
+        repository_ctx.symlink(paths["@bazel_tools//tools/cpp:bsd_cc_toolchain_config.bzl"], "cc_toolchain_config.bzl")
+        repository_ctx.symlink(paths["@bazel_tools//tools/cpp:BUILD.static.bsd"], "BUILD")
     elif cpu_value == "x64_windows":
         # TODO(ibiryukov): overriden_tools are only supported in configure_unix_toolchain.
         # We might want to add that to Windows too(at least for msys toolchain).

tools/cpp/cc_toolchain_config.bzl

@@ -98,6 +98,8 @@ def _impl(ctx):
         toolchain_identifier = "local_darwin"
     elif (ctx.attr.cpu == "freebsd"):
         toolchain_identifier = "local_freebsd"
+    elif (ctx.attr.cpu == "openbsd"):
+        toolchain_identifier = "local_openbsd"
     elif (ctx.attr.cpu == "local"):
         toolchain_identifier = "local_linux"
     elif (ctx.attr.cpu == "x64_windows" and ctx.attr.compiler == "windows_clang"):
@@ -119,6 +121,7 @@ def _impl(ctx):
         host_system_name = "armeabi-v7a"
     elif (ctx.attr.cpu == "darwin" or
           ctx.attr.cpu == "freebsd" or
+          ctx.attr.cpu == "openbsd" or
           ctx.attr.cpu == "local" or
           ctx.attr.cpu == "x64_windows" or
           ctx.attr.cpu == "x64_windows_msvc"):
@@ -130,6 +133,7 @@ def _impl(ctx):
         target_system_name = "armeabi-v7a"
     elif (ctx.attr.cpu == "darwin" or
           ctx.attr.cpu == "freebsd" or
+          ctx.attr.cpu == "openbsd" or
           ctx.attr.cpu == "local" or
           ctx.attr.cpu == "x64_windows" or
           ctx.attr.cpu == "x64_windows_msvc"):
@@ -143,6 +147,8 @@ def _impl(ctx):
         target_cpu = "darwin"
     elif (ctx.attr.cpu == "freebsd"):
         target_cpu = "freebsd"
+    elif (ctx.attr.cpu == "openbsd"):
+        target_cpu = "openbsd"
     elif (ctx.attr.cpu == "local"):
         target_cpu = "local"
     elif (ctx.attr.cpu == "x64_windows"):
@@ -155,6 +161,7 @@ def _impl(ctx):
     if (ctx.attr.cpu == "armeabi-v7a"):
         target_libc = "armeabi-v7a"
     elif (ctx.attr.cpu == "freebsd" or
+          ctx.attr.cpu == "openbsd" or
           ctx.attr.cpu == "local" or
           ctx.attr.cpu == "x64_windows"):
         target_libc = "local"
@@ -170,6 +177,7 @@ def _impl(ctx):
     elif (ctx.attr.cpu == "armeabi-v7a" or
           ctx.attr.cpu == "darwin" or
           ctx.attr.cpu == "freebsd" or
+          ctx.attr.cpu == "openbsd" or
           ctx.attr.cpu == "local"):
         compiler = "compiler"
     elif (ctx.attr.cpu == "x64_windows" and ctx.attr.compiler == "windows_clang"):
@@ -187,6 +195,7 @@ def _impl(ctx):
         abi_version = "armeabi-v7a"
     elif (ctx.attr.cpu == "darwin" or
           ctx.attr.cpu == "freebsd" or
+          ctx.attr.cpu == "openbsd" or
           ctx.attr.cpu == "local" or
           ctx.attr.cpu == "x64_windows" or
           ctx.attr.cpu == "x64_windows_msvc"):
@@ -198,6 +207,7 @@ def _impl(ctx):
         abi_libc_version = "armeabi-v7a"
     elif (ctx.attr.cpu == "darwin" or
           ctx.attr.cpu == "freebsd" or
+          ctx.attr.cpu == "openbsd" or
           ctx.attr.cpu == "local" or
           ctx.attr.cpu == "x64_windows" or
           ctx.attr.cpu == "x64_windows_msvc"):
@@ -211,6 +221,7 @@ def _impl(ctx):
 
     if (ctx.attr.cpu == "darwin" or
         ctx.attr.cpu == "freebsd" or
+        ctx.attr.cpu == "openbsd" or
         ctx.attr.cpu == "local"):
         objcopy_embed_data_action = action_config(
             action_name = "objcopy_embed_data",
@@ -274,6 +285,7 @@ def _impl(ctx):
         action_configs = [c_compile_action, cpp_compile_action]
     elif (ctx.attr.cpu == "darwin" or
           ctx.attr.cpu == "freebsd" or
+          ctx.attr.cpu == "openbsd" or
           ctx.attr.cpu == "local" or
           ctx.attr.cpu == "x64_windows"):
         action_configs = [objcopy_embed_data_action]
@@ -348,7 +360,8 @@ def _impl(ctx):
                 ),
             ],
         )
-    elif (ctx.attr.cpu == "freebsd"):
+    elif (ctx.attr.cpu == "freebsd" or
+          ctx.atr.cpu == "openbsd"):
         default_link_flags_feature = feature(
             name = "default_link_flags",
             enabled = True,
@@ -417,7 +430,8 @@ def _impl(ctx):
         )
 
     if (ctx.attr.cpu == "darwin" or
-        ctx.attr.cpu == "freebsd"):
+        ctx.attr.cpu == "freebsd" or
+        ctx.attr.cpu == "openbsd"):
         unfiltered_compile_flags_feature = feature(
             name = "unfiltered_compile_flags",
             enabled = True,
@@ -685,7 +699,8 @@ def _impl(ctx):
                 ),
             ],
         )
-    elif (ctx.attr.cpu == "freebsd"):
+    elif (ctx.attr.cpu == "freebsd" or
+          ctx.attr.cpu == "openbsd"):
         default_compile_flags_feature = feature(
             name = "default_compile_flags",
             enabled = True,
@@ -941,6 +956,7 @@ def _impl(ctx):
 
     if (ctx.attr.cpu == "darwin" or
         ctx.attr.cpu == "freebsd" or
+        ctx.attr.cpu == "openbsd" or
         ctx.attr.cpu == "local"):
         user_compile_flags_feature = feature(
             name = "user_compile_flags",
@@ -996,6 +1012,7 @@ def _impl(ctx):
 
     if (ctx.attr.cpu == "darwin" or
         ctx.attr.cpu == "freebsd" or
+        ctx.attr.cpu == "openbsd" or
         ctx.attr.cpu == "local"):
         sysroot_feature = feature(
             name = "sysroot",
@@ -1152,6 +1169,7 @@ def _impl(ctx):
             unfiltered_compile_flags_feature,
         ]
     elif (ctx.attr.cpu == "freebsd" or
+          ctx.attr.cpu == "openbsd" or
           ctx.attr.cpu == "local"):
         features = [
             default_compile_flags_feature,
@@ -1196,7 +1214,8 @@ def _impl(ctx):
         cxx_builtin_include_directories = []
     elif (ctx.attr.cpu == "darwin"):
         cxx_builtin_include_directories = ["/"]
-    elif (ctx.attr.cpu == "freebsd"):
+    elif (ctx.attr.cpu == "freebsd" or
+          ctx.attr.cpu == "openbsd"):
         cxx_builtin_include_directories = ["/usr/lib/clang", "/usr/local/include", "/usr/include"]
     elif (ctx.attr.cpu == "local" or
           ctx.attr.cpu == "x64_windows" and ctx.attr.compiler == "windows_clang"):
@@ -1297,6 +1316,20 @@ def _impl(ctx):
             tool_path(name = "objdump", path = "/usr/bin/objdump"),
             tool_path(name = "strip", path = "/usr/bin/strip"),
         ]
+    elif (ctx.attr.cpu == "openbsd"):
+        tool_paths = [
+            tool_path(name = "ar", path = "/usr/bin/ar"),
+            tool_path(name = "compat-ld", path = "/usr/bin/ld"),
+            tool_path(name = "cpp", path = "/usr/bin/cpp"),
+            tool_path(name = "dwp", path = "/usr/bin/false"),
+            tool_path(name = "gcc", path = "/usr/bin/clang"),
+            tool_path(name = "gcov", path = "/usr/bin/gcov"),
+            tool_path(name = "ld", path = "/usr/bin/ld"),
+            tool_path(name = "nm", path = "/usr/bin/nm"),
+            tool_path(name = "objcopy", path = "/usr/bin/objcopy"),
+            tool_path(name = "objdump", path = "/usr/bin/objdump"),
+            tool_path(name = "strip", path = "/usr/bin/strip"),
+        ]
     elif (ctx.attr.cpu == "local"):
         tool_paths = [
             tool_path(name = "ar", path = "/usr/bin/ar"),

tools/cpp/lib_cc_configure.bzl

@@ -184,6 +184,8 @@ def get_cpu_value(repository_ctx):
         return "darwin"
     if os_name.find("freebsd") != -1:
         return "freebsd"
+    if os_name.find("openbsd") != -1:
+        return "openbsd"
     if os_name.find("windows") != -1:
         return "x64_windows"