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[Bazel] Support generating a secondary cache (#1405)

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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
This commit is contained in:
Michael Allwright
2024-07-01 18:23:07 +02:00
committed by GitHub
parent 7fbd555dbe
commit 82d41a76d3
14 changed files with 199 additions and 3 deletions
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23
bazel/emscripten_toolchain/default_config Normal file
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import os
import platform
ROOT_DIR = os.environ["ROOT_DIR"]
EMSCRIPTEN_ROOT = os.environ["EMSCRIPTEN"]
BINARYEN_ROOT = os.path.join(ROOT_DIR, os.environ["EM_BIN_PATH"])
LLVM_ROOT = os.path.join(BINARYEN_ROOT, "bin")
FROZEN_CACHE = True
system = platform.system()
machine = "arm64" if platform.machine() in ('arm64', 'aarch64') else "amd64"
nodejs_binary = "bin/nodejs/node.exe" if(system =="Windows") else "bin/node"
NODE_JS = ROOT_DIR + "/external/nodejs_{}_{}/{}".format(system.lower(), machine, nodejs_binary)
# This works around an issue with Bazel RBE where the symlinks in node_modules/.bin
# are uploaded as the linked files, which means the cli.js cannot load its
# dependencies from the expected locations.
# See https://github.com/emscripten-core/emscripten/pull/16640 for more
if system != "Windows":
CLOSURE_COMPILER = [NODE_JS, os.path.join(EMSCRIPTEN_ROOT, "node_modules",
"google-closure-compiler", "cli.js")]