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build/wasm: enable wasm_exceptions in bazel rules for cpp plugins #199

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leonm1 merged 1 commit into from
Aug 28, 2026
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build/wasm: enable wasm_exceptions in bazel rules for cpp plugins #199

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28 changes: 23 additions & 5 deletions bazel/defs.bzl
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Original file line number Diff line number Diff line change
Expand Up @@ -19,20 +19,38 @@ def _optimized_wasm_cc_binary_transition_impl(settings, attr):
# Define STANDALONE_WASM at compile time as well as link time (below).
# This fixes Abseil by not including Emscripten JS stacktraces + symbolization.
# TODO(martijneken): Remove after Abseil stops using this define.

copts = list(settings["//command_line_option:copt"])
copts.append("-O3")
copts.append("-DSTANDALONE_WASM")

linkopts = list(settings["//command_line_option:linkopt"])
linkopts.append("-O3")

features = list(settings["//command_line_option:features"])
# Enable native wasm exceptions, see https://emscripten.org/docs/porting/exceptions.html.
features.append("wasm_exceptions")
features.append("wasm_sjlj")
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leonm1 marked this conversation as resolved.
features.append("-emscripten_sjlj")

return {
"//command_line_option:copt": ["-O3", "-flto", "-DSTANDALONE_WASM"],
"//command_line_option:cxxopt": [],
"//command_line_option:linkopt": [],
"//command_line_option:copt": copts,
"//command_line_option:linkopt": linkopts,
"//command_line_option:features": features,
"//command_line_option:collect_code_coverage": False,
}

_optimized_wasm_cc_binary_transition = transition(
implementation = _optimized_wasm_cc_binary_transition_impl,
inputs = [],
inputs = [
"//command_line_option:copt",
"//command_line_option:linkopt",
"//command_line_option:features",
],
outputs = [
"//command_line_option:copt",
"//command_line_option:cxxopt",
"//command_line_option:linkopt",
"//command_line_option:features",
"//command_line_option:collect_code_coverage",
],
)
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