https://bugs.llvm.org/show_bug.cgi?id=48245
Bug ID: 48245
Summary: -fwhole-program-vtables causes unused vtables to be
kept (breaks --gc-sections)
Product: lld
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Not a confirmed theory, but it seems like the most plausible explanation for
what we're seeing.
When enabling -fwhole-program-vtables for Chrome on Android (arm32), the number
of relocations goes up instead of down.
I created a SuperSize report with --relocations, which produces a report of
just symbols that have relocations applied to them, and where their size is
replaced by the count of relocations that are applied to them.
Report:
https://chrome-supersize.firebaseapp.com/viewer.html?load_url=https%3A%2F%2Fstorage.googleapis.com%2Fchrome-supersize%2Foneoffs%2F1544ee488cda7704a1b001454fa81f09e66ac00d_5a6a344f9cb70dc3adf404ab99b1b4fce943b6ed.sizediff&byteunit=B&diff_mode=on
I chatted with [email protected], and we think the problem is that
-fwhole-program-vtables removes all section names in favor of a few
".L__unnamed_#" sections, and that's what's breaking --gc-sections's ability to
remove unused virtual classes.
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