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Set target_libc to macosx for Apple platforms #665

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Set target_libc to macosx for Apple platforms #665

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f4bcd6e
Set target_libc to macosx for Apple platforms
keith Mar 25, 2026
9907345
Merge branch 'main' into ks/set-target_libc-to-macosx-for-apple-platf…
lilygorsheneva May 12, 2026
f95dd15
Update toolchain.bzl
lilygorsheneva May 12, 2026
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3 changes: 2 additions & 1 deletion cc/toolchains/impl/toolchain_config.bzl
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Original file line number Diff line number Diff line change
Expand Up @@ -95,9 +95,9 @@ def cc_toolchain_config_impl_helper(ctx):
# compiler
compiler = ctx.attr.compiler,
target_cpu = ctx.attr.cpu,
target_libc = ctx.attr.target_libc, # Used by legacy features to determine if we're building for Apple platfroms or not
target_system_name = ctx.expand_make_variables("target_system_name", ctx.attr.target_system_name, {}),
# These fields are only relevant for legacy toolchain resolution.
target_libc = "",
abi_version = "",
abi_libc_version = "",
),
Expand All @@ -120,6 +120,7 @@ CC_TOOLCHAIN_CONFIG_PUBLIC_ATTRS = {
# Attributes new to this rule.
"compiler": attr.string(default = ""),
"cpu": attr.string(default = ""),
"target_libc": attr.string(default = ""),
"target_system_name": attr.string(default = ""),
"tool_map": attr.label(providers = [ToolConfigInfo], mandatory = True),
"args": attr.label_list(providers = [ArgsListInfo]),
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7 changes: 7 additions & 0 deletions cc/toolchains/toolchain.bzl
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,11 @@ def cc_toolchain(
"//conditions:default": "",
})

target_libc = select({
Label("//cc/settings:apple_constraint"): "macosx",
"//conditions:default": "",
})

if bazel_features.cc.supports_starlarkified_toolchains:
_cc_toolchain(
name = name,
Expand All @@ -183,6 +188,7 @@ def cc_toolchain(
known_features = known_features,
enabled_features = enabled_features,
compiler = compiler,
target_libc = target_libc,
cpu = cpu or _CPU,
target_system_name = target_system_name,
dynamic_runtime_lib = dynamic_runtime_lib,
Expand All @@ -208,6 +214,7 @@ def cc_toolchain(
enabled_features = enabled_features,
compiler = compiler,
cpu = cpu or _CPU,
target_libc = target_libc,
target_system_name = target_system_name,
visibility = ["//visibility:private"],
**kwargs
Expand Down