tree add8c5d2c52dad624f33097cb93d6fe056c93637
parent 1de6f6517b76fa7f7867032d4883a522b731a3b4
author Qiongsi Wu <qiongsiwu@gmail.com> 1758235334 -0700
committer GitHub <noreply@github.com> 1758235334 -0700
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[clang][Dependency Scanning] Canonicalize Defines of a Compiler Invocation As Early As Possible (#159620)

Before this patch, we only perform `-D` canonicalization on the deep
copy of the `CompilerInvocation` instance, since the canonicalization
should have no impact on scanning.

However, in the presence of CAS, the content of the `builtin` macros are
included in the context hash. This patch makes sure that we canonicalize
the scanning `CompilerInvocation`'s `-D`s.

Part of work for rdar://136303612.

---------

Co-authored-by: Jan Svoboda <jan@svoboda.ai>