Skip to content

Make windows toolchain configurable with BAZEL_*OPTS #431

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
AustinSchuh wants to merge 5 commits into from
Closed

Make windows toolchain configurable with BAZEL_*OPTS #431

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
3b661c0
Make windows toolchain configurable with BAZEL_*OPTS
AustinSchuh Jul 5, 2025
731963a
Deduplicate the default field value for BAZEL_WIN32_WINNT
AustinSchuh Jul 23, 2025
c460d54
Merge branch 'main' into configurable_windows_toolchain
AustinSchuh Jul 23, 2025
6d26eb2
Merge branch 'main' into configurable_windows_toolchain
AustinSchuh Dec 2, 2025
96e665f
s/c_flags/all_compile_flags/g for trybka
AustinSchuh Dec 15, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
50 changes: 50 additions & 0 deletions cc/private/toolchain/BUILD.windows.tpl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -124,6 +124,11 @@ cc_toolchain_config(
cxx_builtin_include_directories = [%{cxx_builtin_include_directories}],
tool_paths = {%{tool_paths}},
tool_bin_path = "%{tool_bin_path}",
c_flags = [%{c_flags}],
conly_flags = [%{conly_flags}],
cxx_flags = [%{cxx_flags}],
link_flags = [%{link_flags}],
win32_winnt_flag = "%{win32_winnt_flag}",
)

toolchain(
Expand Down Expand Up @@ -170,6 +175,11 @@ cc_toolchain_config(
tool_bin_path = "%{tool_bin_path}",
default_compile_flags = ["-m32"],
default_link_flags = ["-m32"],
c_flags = [%{c_flags}],
conly_flags = [%{conly_flags}],
cxx_flags = [%{cxx_flags}],
link_flags = [%{link_flags}],
win32_winnt_flag = "%{win32_winnt_flag}",
)

toolchain(
Expand Down Expand Up @@ -214,6 +224,11 @@ cc_toolchain_config(
tool_bin_path = "%{mingw_tool_bin_path}",
cxx_builtin_include_directories = [%{mingw_cxx_builtin_include_directories}],
tool_paths = {%{mingw_tool_paths}},
c_flags = [%{c_flags}],
conly_flags = [%{conly_flags}],
cxx_flags = [%{cxx_flags}],
link_flags = [%{link_flags}],
win32_winnt_flag = "%{win32_winnt_flag}",
)

toolchain(
Expand Down Expand Up @@ -260,6 +275,11 @@ cc_toolchain_config(
tool_paths = {%{mingw_tool_paths}},
default_compile_flags = ["-m32"],
default_link_flags = ["-m32"],
c_flags = [%{c_flags}],
conly_flags = [%{conly_flags}],
cxx_flags = [%{cxx_flags}],
link_flags = [%{link_flags}],
win32_winnt_flag = "%{win32_winnt_flag}",
)

toolchain(
Expand Down Expand Up @@ -330,6 +350,11 @@ cc_toolchain_config(
dbg_mode_debug_flag = "%{dbg_mode_debug_flag_x64}",
fastbuild_mode_debug_flag = "%{fastbuild_mode_debug_flag_x64}",
supports_parse_showincludes = %{msvc_parse_showincludes_x64},
c_flags = [%{c_flags}],
conly_flags = [%{conly_flags}],
cxx_flags = [%{cxx_flags}],
link_flags = [%{link_flags}],
win32_winnt_flag = "%{win32_winnt_flag}",
)

toolchain(
Expand Down Expand Up @@ -399,6 +424,11 @@ cc_toolchain_config(
dbg_mode_debug_flag = "%{dbg_mode_debug_flag_x86}",
fastbuild_mode_debug_flag = "%{fastbuild_mode_debug_flag_x86}",
supports_parse_showincludes = %{msvc_parse_showincludes_x86},
c_flags = [%{c_flags}],
conly_flags = [%{conly_flags}],
cxx_flags = [%{cxx_flags}],
link_flags = [%{link_flags}],
win32_winnt_flag = "%{win32_winnt_flag}",
)

toolchain(
Expand Down Expand Up @@ -468,6 +498,11 @@ cc_toolchain_config(
dbg_mode_debug_flag = "%{dbg_mode_debug_flag_arm}",
fastbuild_mode_debug_flag = "%{fastbuild_mode_debug_flag_arm}",
supports_parse_showincludes = %{msvc_parse_showincludes_arm},
c_flags = [%{c_flags}],
conly_flags = [%{conly_flags}],
cxx_flags = [%{cxx_flags}],
link_flags = [%{link_flags}],
win32_winnt_flag = "%{win32_winnt_flag}",
)

toolchain(
Expand Down Expand Up @@ -537,6 +572,11 @@ cc_toolchain_config(
dbg_mode_debug_flag = "%{dbg_mode_debug_flag_arm64}",
fastbuild_mode_debug_flag = "%{fastbuild_mode_debug_flag_arm64}",
supports_parse_showincludes = %{msvc_parse_showincludes_arm64},
c_flags = [%{c_flags}],
conly_flags = [%{conly_flags}],
cxx_flags = [%{cxx_flags}],
link_flags = [%{link_flags}],
win32_winnt_flag = "%{win32_winnt_flag}",
)

toolchain(
Expand Down Expand Up @@ -604,6 +644,11 @@ cc_toolchain_config(
dbg_mode_debug_flag = "%{clang_cl_dbg_mode_debug_flag_x64}",
fastbuild_mode_debug_flag = "%{clang_cl_fastbuild_mode_debug_flag_x64}",
supports_parse_showincludes = %{clang_cl_parse_showincludes_x64},
c_flags = [%{c_flags}],
conly_flags = [%{conly_flags}],
cxx_flags = [%{cxx_flags}],
link_flags = [%{link_flags}],
win32_winnt_flag = "%{win32_winnt_flag}",
)

toolchain(
Expand Down Expand Up @@ -672,6 +717,11 @@ cc_toolchain_config(
dbg_mode_debug_flag = "%{clang_cl_dbg_mode_debug_flag_arm64}",
fastbuild_mode_debug_flag = "%{clang_cl_fastbuild_mode_debug_flag_arm64}",
supports_parse_showincludes = %{clang_cl_parse_showincludes_arm64},
c_flags = [%{c_flags}],
conly_flags = [%{conly_flags}],
cxx_flags = [%{cxx_flags}],
link_flags = [%{link_flags}],
win32_winnt_flag = "%{win32_winnt_flag}",
)

toolchain(
Expand Down
1 change: 1 addition & 0 deletions cc/private/toolchain/cc_configure.bzl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -125,6 +125,7 @@ cc_autoconf = repository_rule(
"BAZEL_TARGET_SYSTEM",
"BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN",
"BAZEL_USE_LLVM_NATIVE_COVERAGE",
"BAZEL_WIN32_WINNT",
"BAZEL_LLVM",
"BAZEL_IGNORE_SYSTEM_HEADERS_VERSIONS",
"USE_CLANG_CL",
Expand Down
39 changes: 39 additions & 0 deletions cc/private/toolchain/windows_cc_configure.bzl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,9 @@ load(
"auto_configure_warning_maybe",
"escape_string",
"execute",
"get_starlark_list",
"resolve_labels",
"split_escaped",
"write_builtin_include_directory_paths",
)

Expand Down Expand Up @@ -848,6 +850,42 @@ def _get_msvc_deps_scanner_vars(repository_ctx, paths, template_vars, target_arc
"%{msvc_deps_scanner_wrapper_path_" + target_arch + "}": "msvc_deps_scanner_wrapper_" + target_arch + ".bat",
}

def _get_copts(repository_ctx):
"""Get the variables we need to populate the msys/mingw toolchains."""
conly_opts = split_escaped(_get_env_var(
repository_ctx,
"BAZEL_CONLYOPTS",
"",
), ":")
c_opts = split_escaped(_get_env_var(
repository_ctx,
"BAZEL_COPTS",
"",
), ":")
cxx_opts = split_escaped(_get_env_var(
repository_ctx,
"BAZEL_CXXOPTS",
"",
), ":")
link_opts = split_escaped(_get_env_var(
repository_ctx,
"BAZEL_LINKOPTS",
"",
), ":")
win32_winnt_opts = _get_env_var(
repository_ctx,
"BAZEL_WIN32_WINNT",
"/D_WIN32_WINNT=0x0601",
)
copts_vars = {
"%{c_flags}": get_starlark_list(c_opts),
"%{conly_flags}": get_starlark_list(conly_opts),
"%{cxx_flags}": get_starlark_list(cxx_opts),
"%{link_flags}": get_starlark_list(link_opts),
"%{win32_winnt_flag}": escape_string(win32_winnt_opts),
}
return copts_vars

def configure_windows_toolchain(repository_ctx):
"""Configure C++ toolchain on Windows.

Expand Down Expand Up @@ -882,6 +920,7 @@ def configure_windows_toolchain(repository_ctx):
template_vars.update(msvc_vars_x64)
template_vars.update(_get_clang_cl_vars(repository_ctx, paths, msvc_vars_x64, "x64"))
template_vars.update(_get_msys_mingw_vars(repository_ctx))
template_vars.update(_get_copts(repository_ctx))
template_vars.update(_get_msvc_vars(repository_ctx, paths, "x86", msvc_vars_x64))
template_vars.update(_get_msvc_vars(repository_ctx, paths, "arm", msvc_vars_x64))
msvc_vars_arm64 = _get_msvc_vars(repository_ctx, paths, "arm64", msvc_vars_x64)
Expand Down
108 changes: 93 additions & 15 deletions cc/private/toolchain/windows_cc_toolchain_config.bzl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,12 @@ all_link_actions = [
ACTION_NAMES.cpp_link_nodeps_dynamic_library,
]

lto_index_actions = [
ACTION_NAMES.lto_index_for_executable,
ACTION_NAMES.lto_index_for_dynamic_library,
ACTION_NAMES.lto_index_for_nodeps_dynamic_library,
]

def _use_msvc_toolchain(ctx):
return ctx.attr.cpu in ["x64_windows", "arm64_windows"] and (ctx.attr.compiler == "msvc-cl" or ctx.attr.compiler == "clang-cl")

Expand Down Expand Up @@ -579,14 +585,42 @@ def _impl(ctx):
ACTION_NAMES.cpp20_module_compile,
ACTION_NAMES.cpp20_module_codegen,
],
flag_groups = [
flag_groups = ([
flag_group(
flags = ctx.attr.c_flags,
),
] if ctx.attr.c_flags else []) + [
flag_group(
flags = ["%{user_compile_flags}"],
iterate_over = "user_compile_flags",
expand_if_available = "user_compile_flags",
),
],
),
flag_set(
actions = [ACTION_NAMES.c_compile],
flag_groups = ([
flag_group(
flags = ctx.attr.conly_flags,
),
] if ctx.attr.conly_flags else []),
),
flag_set(
actions = [
ACTION_NAMES.linkstamp_compile,
ACTION_NAMES.cpp_compile,
ACTION_NAMES.cpp_header_parsing,
ACTION_NAMES.cpp_module_compile,
ACTION_NAMES.cpp_module_codegen,
ACTION_NAMES.lto_backend,
ACTION_NAMES.clif_match,
],
flag_groups = ([
flag_group(
flags = ctx.attr.cxx_flags,
),
] if ctx.attr.cxx_flags else []),
),
],
)

Expand Down Expand Up @@ -725,9 +759,32 @@ def _impl(ctx):
),
],
),
flag_set(
actions = all_link_actions + lto_index_actions,
flag_groups = ([
flag_group(
flags = ctx.attr.link_flags,
),
] if ctx.attr.link_flags else []),
),
],
)

default_compile_flags_list = [
"/DNOMINMAX",
"/D_CRT_SECURE_NO_DEPRECATE",
"/D_CRT_SECURE_NO_WARNINGS",
"/bigobj",
"/Zm500",
"/EHsc",
"/wd4351",
"/wd4291",
"/wd4250",
"/wd4996",
]
if ctx.attr.win32_winnt_flag:
default_compile_flags_list.append(ctx.attr.win32_winnt_flag)

default_compile_flags_feature = feature(
name = "default_compile_flags",
enabled = True,
Expand All @@ -750,19 +807,7 @@ def _impl(ctx):
],
flag_groups = [
flag_group(
flags = [
"/DNOMINMAX",
"/D_WIN32_WINNT=0x0601",
"/D_CRT_SECURE_NO_DEPRECATE",
"/D_CRT_SECURE_NO_WARNINGS",
"/bigobj",
"/Zm500",
"/EHsc",
"/wd4351",
"/wd4291",
"/wd4250",
"/wd4996",
],
flags = default_compile_flags_list,
),
],
),
Expand Down Expand Up @@ -1533,14 +1578,42 @@ def _impl(ctx):
ACTION_NAMES.lto_backend,
ACTION_NAMES.clif_match,
],
flag_groups = [
flag_groups = ([
flag_group(
flags = ctx.attr.c_flags,
),
] if ctx.attr.c_flags else []) + [
flag_group(
flags = ["%{user_compile_flags}"],
iterate_over = "user_compile_flags",
expand_if_available = "user_compile_flags",
),
],
),
flag_set(
actions = [ACTION_NAMES.c_compile],
flag_groups = ([
flag_group(
flags = ctx.attr.conly_flags,
),
] if ctx.attr.conly_flags else []),
),
flag_set(
actions = [
ACTION_NAMES.linkstamp_compile,
ACTION_NAMES.cpp_compile,
ACTION_NAMES.cpp_header_parsing,
ACTION_NAMES.cpp_module_compile,
ACTION_NAMES.cpp_module_codegen,
ACTION_NAMES.lto_backend,
ACTION_NAMES.clif_match,
],
flag_groups = ([
flag_group(
flags = ctx.attr.cxx_flags,
),
] if ctx.attr.cxx_flags else []),
),
],
)

Expand Down Expand Up @@ -1641,14 +1714,18 @@ cc_toolchain_config = rule(
"abi_libc_version": attr.string(),
"abi_version": attr.string(),
"archiver_flags": attr.string_list(default = []),
"c_flags": attr.string_list(),
"compiler": attr.string(),
"conly_flags": attr.string_list(),
"cpu": attr.string(mandatory = True),
"cxx_builtin_include_directories": attr.string_list(),
"cxx_flags": attr.string_list(),
"dbg_mode_debug_flag": attr.string(default = ""),
"default_compile_flags": attr.string_list(default = []),
"default_link_flags": attr.string_list(default = []),
"fastbuild_mode_debug_flag": attr.string(default = ""),
"host_system_name": attr.string(),
"link_flags": attr.string_list(),
"msvc_cl_path": attr.string(default = "vc_installation_error.bat"),
"msvc_env_include": attr.string(default = "msvc_not_found"),
"msvc_env_lib": attr.string(default = "msvc_not_found"),
Expand All @@ -1663,6 +1740,7 @@ cc_toolchain_config = rule(
"tool_bin_path": attr.string(default = "not_found"),
"tool_paths": attr.string_dict(),
"toolchain_identifier": attr.string(),
"win32_winnt_flag": attr.string(default = "/D_WIN32_WINNT=0x0601"),
Comment thread
AustinSchuh marked this conversation as resolved.
},
provides = [CcToolchainConfigInfo],
)