https://bugs.llvm.org/show_bug.cgi?id=40074
Bug ID: 40074
Summary: Duplicate definition of symbol error to do with
mergable comdat constant symbols on Windows/COFF
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: OrcJIT
Assignee: unassignedb...@nondot.org
Reporter: cont...@machiel.info
CC: 1101.deb...@gmail.com, llvm-bugs@lists.llvm.org
It happens when the same literal is defined twice, each in a different module
and after the second module has been added to the RTDyldObjectLinkingLayer.
So for example in some module:
define float @someFunction() {
entry:
ret float 2.000000e+00
}
In some other module:
define float @someOtherFunction() {
entry:
ret float 2.000000e+00
}
When materializing the second function, you will get this error:
JIT session error: Duplicate definition of symbol '__real@40000000'
The symbol names come from comdat symbols that are created in
TargetLoweringObjectFileImpl.cpp
TargetLoweringObjectFileCOFF::getSectionForConstant
For COFF, I have the OverrideObjectFlagsWithResponsibilityFlags and
AutoClaimResponsibilityForObjectSymbols set to true on the
RTDyldObjectLinkingLayer or my function symbols are not found at all.
The same code compiles and runs just fine on Linux/Elf, even with the COFF
workarounds enabled there as well.
A workaround I found is to set HasCOFFComdatConstants to false in
MCAsmInfoCOFF.cpp
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