remove `.2.19` from toolchain params

Only the default toolchain can be exposed.

.build.yml

@@ -15,13 +15,13 @@ tasks:
         //test:gognu
   - test_linux-gnu: |
       cd bazel-zig-cc; ../bazel run \
-        --platforms @zig_sdk//:platform_x86_64-linux-gnu \
+        --platforms @zig_sdk//:x86_64-linux-gnu \
         //test:gognu
   - test_linux-musl: |
       cd bazel-zig-cc; ../bazel run \
-        --platforms @zig_sdk//:platform_x86_64-linux-musl \
+        --platforms @zig_sdk//:x86_64-linux-musl \
         //test:gomusl
   #- test_macos-gnu: |
   #    cd bazel-zig-cc; ../bazel build --toolchain_resolution_debug=true \
-  #      --platforms @zig_sdk//:platform_x86_64-macos-gnu \
+  #      --platforms @zig_sdk//:x86_64-macos-gnu \
   #      //test:gognu

README.md

@@ -35,13 +35,13 @@ $ file ../bazel-bin/test/gognu_/gognu
 
 Explicitly the toolchain explicitly `-gnu`:
 ```
-$ bazel run --platforms @zig_sdk//:platform_x86_64-linux-gnu //test:gognu
+$ bazel run --platforms @zig_sdk//:x86_64-linux-gnu //test:gognu
 ```
 
 ## linux cgo + musl
 
 ```
-$ bazel build --platforms @zig_sdk//:platform_x86_64-linux-musl //test:gomusl
+$ bazel build --platforms @zig_sdk//:x86_64-linux-musl //test:gomusl
 ...
 $ file ../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/gomusl_/gomusl
 ../bazel-out/k8-fastbuild-ST-d17813c235ce/bin/test/gomusl_/gomusl: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, Go BuildID=redacted, with debug_info, not stripped
@@ -54,7 +54,7 @@ hello, world
 Does not work?
 
 ```
-$ bazel build --platforms @zig_sdk//:platform_x86_64-macos-musl //test:gognu
+$ bazel build --platforms @zig_sdk//:x86_64-macos-musl //test:gognu
 ...
 ```
 

toolchain/BUILD.sdk.bazel

@@ -1,36 +1,10 @@
 load("@zig-cc-bazel//toolchain:defs.bzl", "zig_build_macro")
-package(default_visibility = ["//visibility:public"])
-zig_build_macro(absolute_path={absolute_path}, zig_include_root={zig_include_root})
 
-constraint_setting(name = "libc")
-
-constraint_value(
-    name = "musl",
-    constraint_setting = ":libc",
+package(
+    default_visibility = ["//visibility:public"]
 )
 
-
-platform(
-    name = "platform_x86_64-macos-gnu",
-    constraint_values = [
-        "@platforms//os:macos",
-        "@platforms//cpu:x86_64",
-    ],
-)
-
-platform(
-    name = "platform_x86_64-linux-gnu",
-    constraint_values = [
-        "@platforms//os:linux",
-        "@platforms//cpu:x86_64",
-    ],
-)
-
-platform(
-    name = "platform_x86_64-linux-musl",
-    constraint_values = [
-        "@platforms//os:linux",
-        "@platforms//cpu:x86_64",
-        ":musl",
-    ],
+zig_build_macro(
+    absolute_path={absolute_path},
+    zig_include_root={zig_include_root},
 )

toolchain/defs.bzl

@@ -39,7 +39,8 @@ TARGET_CONFIGS = [
         tool_paths={"ld": "ld64.lld"},
     ),
     struct(
-        target="x86_64-linux-gnu.2.19",
+        target="x86_64-linux-gnu",
+        target_suffix = ".2.19",
         includes=[
             "libunwind/include",
             "libc/include/generic-glibc",
@@ -182,11 +183,21 @@ def zig_build_macro(absolute_path, zig_include_root):
     filegroup(name="zig_compiler", srcs=["zig"])
     filegroup(name="lib/std", srcs=native.glob(["lib/std/**"]))
 
+    native.constraint_setting(name = "libc")
+
+    native.constraint_value(
+        name = "musl",
+        constraint_setting = ":libc",
+    )
+
     lazy_filegroups = {}
 
     for target_config in TARGET_CONFIGS:
         target = target_config.target
-        native.platform(name = target, constraint_values = target_config.constraint_values)
+        native.platform(
+            name = target,
+            constraint_values = target_config.constraint_values,
+        )
 
         all_srcs = []
         ar_srcs = [":zig_compiler"]
@@ -219,6 +230,7 @@ def zig_build_macro(absolute_path, zig_include_root):
         zig_cc_toolchain_config(
             name = target + "_cc_toolchain_config",
             target = target,
+            target_suffix = getattr(target_config, 'target_suffix', ''),
             tool_paths = absolute_tool_paths,
             cxx_builtin_include_directories = cxx_builtin_include_directories,
             copts = target_config.copts,

toolchain/zig_toolchain.bzl

@@ -40,7 +40,7 @@ def _zig_cc_toolchain_config_impl(ctx):
                             "-I" + d
                             for d in ctx.attr.cxx_builtin_include_directories
                         ] + [
-                            "-target", ctx.attr.target,
+                            "-target", ctx.attr.target + ctx.attr.target_suffix,
                             "-no-canonical-prefixes",
                             "-Wno-builtin-macro-redefined",
                             "-D__DATE__=\"redacted\"",
@@ -104,6 +104,7 @@ zig_cc_toolchain_config = rule(
         "target_system_name": attr.string(),
         "target_cpu": attr.string(),
         "target_libc": attr.string(),
+        "target_suffix": attr.string(),
         "compiler": attr.string(),
         "abi_version": attr.string(),
         "abi_libc_version": attr.string(),