https://bugs.llvm.org/show_bug.cgi?id=50294
Bug ID: 50294
Summary: LLVM12 PCH leads to 2x slower compilation times
Product: clang
Version: 12.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Starting with LLVM12, we are getting a 1.5x - 2x performance hit if we compile
our projects using PCH, compared to without PCH with LLVM 12. Exactly the
opposite of what one would expect by using precompiled headers.
Compared to LLVM 11, with PCH enabled, we are observing a penalty of 3-4x.
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