[llvm-dev] Why -pie option force LLD to output shared obj file type, not executable?

[Shi, Steven via llvm-dev]

Hello Rui,
I'm enabling the LLD in the Uefi firmware edk2 build. I meet a problem about the -pie option and cannot output the executable type obj file correctly. I need your advice.
The Uefi firmware executable binary is the position independent + small code mode in 64bits. So we always add the options "-Wl,-pie -mcmodel=small" in our clang build toolchain. These options work well with binutils LD, but cannot work with LLD. I see the LLD uses the below code to force the output obj file as shared obj type if link with -pie. Is there any way to let LLD output executable type obj with -pie option? I'm OK if I have to link twice, first output DYN and then covert to EXEC in some way. Could you give some link command examples on it?

lld\ELF\Writer.cpp
static uint16_t getELFType() {
  if (Config->Pic)
    return ET_DYN;
  if (Config->Relocatable)
    return ET_REL;
  return ET_EXEC;
}


Thanks
Steven

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