https://llvm.org/bugs/show_bug.cgi?id=24647
Bug ID: 24647
Summary: -fpie has no effect on code generation when doing LTO
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: ahata...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
-fpie enables optimizations that are valid only when it is known that a
position independent code is linked into an executable. However, these
optimizations are not enabled when doing LTO since that information is not
conveyed to the backend. This can possibly be fixed by using module flags or
passing -fpie to the driver's command line. It is also possible to have the
linker inform the backend via libLTO or gold plugin whether it is linking an
executable or a shared library.
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