[llvm-bugs] [Bug 32613] LLD COFF /LTCG option not supported

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Apr 10 17:49:21 PDT 2017


Rui Ueyama <ruiu at google.com> changed:

           What    |Removed                     |Added
         Resolution|---                         |WONTFIX
                 CC|                            |ruiu at google.com
             Status|NEW                         |RESOLVED

--- Comment #1 from Rui Ueyama <ruiu at google.com> ---
The /LTCG option is to make the linker generate code at link-time. This needs
coordination between a compiler and a linker. MSVC's cl.exe and link.exe uses
some intermediate representation of code to generate code. And that
intermediate code is highly compiler-dependent. So it is not supported by our
compiler nor linker.

We instead support LTO (link-time optimization) which is the same feature as
LTCG. Just like cl.exe and link.exe, you need to use clang-cl.exe and
lld-link.exe to use LTO.

You want to use LTO instead of LTCG.

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