https://bugs.llvm.org/show_bug.cgi?id=34169
Bug ID: 34169
Summary: LTO seems to be optimizing away calls to compiler
generated symbols
Product: tools
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: release blocker
Priority: P
Component: lto
Assignee: unassignedb...@nondot.org
Reporter: pho...@chromium.org
CC: llvm-bugs@lists.llvm.org
We're seeing this issue when building our kernel and low-level libraries (below
libc) with LTO. This appears to be a recent regression, we don't see these
issues with our Clang build from April.
https://storage.googleapis.com/fuchsia-build/lld/libuserboot.cpio
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/bin/ld.lld: error:
undefined symbol: memmove
>>> referenced by ld-temp.o
>>> lto.tmp:(bootstrap)
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/bin/ld.lld: error:
undefined symbol: memcpy
>>> referenced by ld-temp.o
>>> lto.tmp:(bootstrap)
https://storage.googleapis.com/fuchsia-build/lld/libmagenta.cpio
/usr/local/google/home/phosek/clang-llvm/llvm/out/lld/bin/ld.lld: error:
undefined symbol: __stack_chk_fail
>>> referenced by acpi.cpp:54
(kernel/platform/pc/acpi.cpp:54)
>>>
lto.tmp:(platform_init_acpi_tables)
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