tree 63a79ddc541fd4bad44bd230803f429064f26729
parent cea074c65731ceb4cbb1985388634c16b4c74479
author Daniele Di Proietto <ddiproietto@google.com> 1656590173 +0100
committer Daniele Di Proietto <ddiproietto@google.com> 1656597353 +0100

gn: Minimize rebuilding when commit hash changes

Today, src/base:base depends on a generated header that embeds the
perfetto version (therefore the repository commit hash).

Since almost everything depends on src/base:base, when the commit hash
changes, everything is rebuilt.

This is kind of wasteful when changing commits often (e.g., when doing
bisects).

This commit fixes the problem by putting version header into its own gn
target, which is going to be depended on by only a few other targets.

This avoids, for example, rebuilding the protoc_plugin, which triggers
the recompilation on most of the perfetto code.

Change-Id: I68140570e1abda489d9f30582eed5f8ddb7b3ead