https://bugs.llvm.org/show_bug.cgi?id=43397
Bug ID: 43397
Summary: Merge r371557 into 9.0.1
Product: clang
Version: 9.0
Hardware: All
OS: All
Status: NEW
Severity: release blocker
Priority: P
Component: -New Bugs
Assignee: unassignedclangbugs at nondot.org
Reporter: dimitry at andric.com
CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
neeilans at live.com, richard-llvm at metafoo.co.uk
Please merge https://reviews.llvm.org/rL371557 ("When evaluating a
__builtin_constant_p conditional, always enter constant-folding mode regardless
of the original evaluation mode") into 9.0.1.
This solves an issue with bootstrapping gcc, where during the linking of
several of its "gen" tools it would error out with many undefined symbols.
These symbol references were emitted because they were in
__builtin_constant_p() expressions, and the corresponding sources were compiled
without any optimization.
See also <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240629#c2> and
<https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240629#c7>.
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