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02bc480b15
Previously, the gn build would create VCSRevision.h / VCSVersion.h files with some LLD_REVISION / LLVM_REVISION / CLANG_REVISION but by default wouldn't add a dependency on .git/logs/HEAD so that the step doesn't rerun after every branch switch or every pull. That's bad for deterministic builds, and having --version print some arbitrarily old revision isn't great either. Instead, move to the model that the cmake build (now) uses fairly consistently: If llvm_append_vc_rev is set, include the revision, else don't. Since the GN build is focused on developers, set llvm_append_vc_rev to false instead of true by default (different from the cmake build), so that things don't rebuild after every branch switch and every pull. While here, also remove some pre-monorepo code. Differential Revision: https://reviews.llvm.org/D72859
53 lines
1.3 KiB
Plaintext
53 lines
1.3 KiB
Plaintext
# This file introduces a templates for calling write_vcsrevision.py.
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#
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# Parameters:
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#
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# header (required) [string]
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#
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# names (optional) [list of strings]
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# Writes "$foo_REVISION" and "$foo_REPOSITORY" for each foo in names.
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# Defaults to [ "LLVM" ]
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declare_args() {
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# If this is set to true, VCSRevision.h is updated after every git commit.
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# That's technically correct, but results in rebuilds after every commit.
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# If it's false (default), VCSRevision.h will not contain a revision.
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llvm_append_vc_rev = false
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}
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template("write_vcsrevision") {
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assert(defined(invoker.header), "must set 'header' in $target_name")
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action(target_name) {
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script = "//llvm/utils/gn/build/write_vcsrevision.py"
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header = invoker.header
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if (defined(invoker.names)) {
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names = invoker.names
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} else {
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names = [ "LLVM" ]
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}
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args = [ rebase_path(header, root_build_dir) ]
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if (llvm_append_vc_rev) {
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depfile = "$header.d"
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args += [
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"--write-git-rev",
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"-d",
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rebase_path(depfile, root_build_dir),
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]
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}
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foreach(name, names) {
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args += [ "--name=$name" ]
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}
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outputs = [ header ]
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forward_variables_from(invoker,
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[
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"public_configs",
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"visibility",
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])
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}
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}
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