82d41a76d3
This is a working solution for generating a separate Emscripten cache.
Note that this requires an additional entry in the workspace as follows:
```starlark
load("@emsdk//:emscripten_cache.bzl", emsdk_emscripten_cache = "emscripten_cache")
emsdk_emscripten_cache()
```
When used like this, the default Emscripten cache will be used. However,
if the entry is as follows:
```starlark
load("@emsdk//:emscripten_cache.bzl", emsdk_emscripten_cache = "emscripten_cache")
emsdk_emscripten_cache(flags = ["--lto"])
```
Then embuilder will be called to build all system libraries and ports
(i.e., the `ALL` option to embuilder) with the LTO option enabled. This
can take awhile, so I have also made possible to specify which libraries
you want to build explicitly:
```starlark
load("@emsdk//:emscripten_cache.bzl", emsdk_emscripten_cache = "emscripten_cache")
emsdk_emscripten_cache(
flags = ["--lto"],
libraries = [
"crtbegin",
"libprintf_long_double-debug",
"libstubs-debug",
"libnoexit",
"libc-debug",
"libdlmalloc",
"libcompiler_rt",
"libc++-noexcept",
"libc++abi-debug-noexcept",
"libsockets"
]
)
```
Resolves #807, resolves #971, resolves #1099, resolves #1362, resolves
#1401
104 lines
2.1 KiB
Python
104 lines
2.1 KiB
Python
load(":toolchain.bzl", "emscripten_cc_toolchain_config_rule")
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package(default_visibility = ["//visibility:public"])
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filegroup(
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name = "common_files",
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srcs = [
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"@emscripten_cache//:emscripten_config",
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"env.sh",
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"env.bat",
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"@nodejs//:node_files",
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],
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)
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filegroup(
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name = "compiler_files",
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srcs = [
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"emcc.sh",
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"emcc.bat",
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"@emsdk//:compiler_files",
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":common_files",
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],
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)
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filegroup(
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name = "linker_files",
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srcs = [
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"emcc_link.sh",
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"emcc_link.bat",
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"link_wrapper.py",
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"@emsdk//:linker_files",
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":common_files",
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],
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)
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filegroup(
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name = "ar_files",
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srcs = [
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"emar.sh",
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"emar.bat",
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"@emsdk//:ar_files",
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":common_files",
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],
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)
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filegroup(
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name = "all_files",
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srcs = [
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":ar_files",
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":compiler_files",
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":linker_files",
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],
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)
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filegroup(name = "empty")
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# dlmalloc.bc is implictly added by the emscripten toolchain
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cc_library(name = "malloc")
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emscripten_cc_toolchain_config_rule(
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name = "wasm",
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cpu = "wasm",
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em_config = "@emscripten_cache//:emscripten_config",
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emscripten_binaries = "@emsdk//:compiler_files",
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script_extension = select({
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"@bazel_tools//src/conditions:host_windows": "bat",
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"//conditions:default": "sh",
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}),
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)
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cc_toolchain(
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name = "cc-compiler-wasm",
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all_files = ":all_files",
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ar_files = ":ar_files",
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as_files = ":empty",
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compiler_files = ":compiler_files",
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dwp_files = ":empty",
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linker_files = ":linker_files",
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objcopy_files = ":empty",
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strip_files = ":empty",
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toolchain_config = "wasm",
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toolchain_identifier = "emscripten-wasm",
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)
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cc_toolchain_suite(
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name = "everything",
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toolchains = {
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"wasm": ":cc-compiler-wasm",
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"wasm|emscripten": ":cc-compiler-wasm",
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},
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)
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toolchain(
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name = "cc-toolchain-wasm",
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target_compatible_with = ["@platforms//cpu:wasm32"],
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toolchain = ":cc-compiler-wasm",
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toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
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)
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py_binary(
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name = "wasm_binary",
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srcs = ["wasm_binary.py"],
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)
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