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c41aa09bfb
Just fixing an old TODO, no dramatic behavior change. Differential Revision: https://reviews.llvm.org/D102843
60 lines
1.8 KiB
Plaintext
60 lines
1.8 KiB
Plaintext
# This file defines a template for using .export files.
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#
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# Parameters:
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# exports_file (required)
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# Path of the .exports file to use.
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#
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# Example use:
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# symbol_exports("my_exports") {
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# exports_file = "//foo/bar/my.exports"
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# }
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# ...
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# shared_library("my_target") {
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# deps = [ ":my_exports" ] # Adds correct ldflags.
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# ...
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# }
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# Corresponds to add_llvm_symbol_exports() in the CMake build.
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template("symbol_exports") {
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# Create a platform-appropriate name for the temporary file.
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linker_file = get_path_info(invoker.exports_file, "name")
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if (current_os == "mac") {
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linker_file = linker_file + "_symbols.txt"
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} else if (current_os == "win") {
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linker_file = linker_file + ".def"
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} else {
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linker_file = linker_file + ".script"
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}
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linker_file = "$target_gen_dir/$linker_file"
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rebased_linker_file = rebase_path(linker_file, root_build_dir)
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config_name = "${target_name}_config"
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config(config_name) {
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# FIXME: With this setup, targets are not relinked automatically
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# when the input exports file is touched but nothing else changes.
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# https://groups.google.com/a/chromium.org/g/gn-dev/c/sN09GYS1ufE
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visibility = [ ":$target_name" ]
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if (current_os == "mac") {
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ldflags = [ "-Wl,-exported_symbols_list,$rebased_linker_file" ]
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} else if (current_os == "win") {
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ldflags = [ "/DEF:$rebased_linker_file" ]
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} else {
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ldflags = [ "-Wl,--version-script,$rebased_linker_file" ]
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}
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}
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action(target_name) {
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script = "//llvm/utils/gn/build/symbol_exports.py"
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inputs = [ invoker.exports_file ]
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outputs = [ linker_file ]
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args = [
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"--format=" + current_os,
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rebase_path(inputs[0], root_build_dir),
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rebased_linker_file,
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]
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# Let targets depending on this receive the right ldflags.
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public_configs = [ ":$config_name" ]
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}
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}
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