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load(
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"//bazel:build_defs.bzl",
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"UPB_DEFAULT_COPTS",
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)
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def py_extension(name, srcs, deps = []):
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version_script = name + "_version_script.lds"
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symbol = "PyInit_" + name
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native.genrule(
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name = "gen_" + version_script,
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outs = [version_script],
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cmd = "echo 'message { global: " + symbol + "; local: *; };' > $@",
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)
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native.cc_binary(
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name = name,
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srcs = srcs,
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copts = UPB_DEFAULT_COPTS + [
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# The Python API requires patterns that are ISO C incompatible, like
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# casts between function pointers and object pointers.
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"-Wno-pedantic",
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],
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# We use a linker script to hide all symbols except the entry point for
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# the module.
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linkopts = select({
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"@platforms//os:linux": ["-Wl,--version-script,$(location :" + version_script + ")"],
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"@platforms//os:macos": [
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"-Wl,-exported_symbol",
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"-Wl,_" + symbol,
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],
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}),
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linkshared = True,
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linkstatic = True,
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deps = deps + [
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":" + version_script,
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"@system_python//:python_headers",
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],
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)
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