https://bugs.llvm.org/show_bug.cgi?id=40368
Bug ID: 40368
Summary: ifunc turns into alias when using LTO
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Linker
Assignee: unassignedb...@nondot.org
Reporter: s...@immunant.com
CC: llvm-bugs@lists.llvm.org
Created attachment 21349
--> https://bugs.llvm.org/attachment.cgi?id=21349&action=edit
Minimal ifunc test case that does not build with -flto
Functions declared with the "ifunc" attribute are correctly handled without
LTO, but as soon as LTO is enabled (full or thin), the bitcode linking drops
the ifunc and treats it as an alias. This leads to completely incorrect code
generation for the ifunc.
ifunc.o (compiled with -flto -c):
@foo = dso_local ifunc i8* (i8*, i32, i64), bitcast (i8* (i8*, i32, i64)*
()* @foo_resolver to i8* (i8*, i32, i64)*)
a.out.0.0.preopt.bc (linked with -flto -Wl,--plugin-opt,save-temps):
@foo = dso_local alias i8* (i8*, i32, i64), bitcast (i8* (i8*, i32, i64)*
()* @foo_resolver to i8* (i8*, i32, i64)*)
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