Re: [edk2-devel] [PATCH] CryptoPkg/FltUsedLib: Add FltUsedLib for float.

["Guomin Jiang" <guomin.jiang@intel.com>]

Hi Ard,

it explain the reason at https://docs.microsoft.com/en-us/cpp/error-messages/tool-errors/linker-tools-error-lnk1237?view=vs-2019.
It can use ```MSFT:*_*_*_DLINK_FLAGS = /include:_fltused``` to resolve the error, but it is complex.

Best Regards
Guomin

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Ard
> Biesheuvel
> Sent: Friday, April 17, 2020 4:15 PM
> To: Jiang, Guomin <guomin.jiang@intel.com>; Ard Biesheuvel
> <ard.biesheuvel@arm.com>
> Cc: devel@edk2.groups.io; Ni, Ray <ray.ni@intel.com>; Kinney, Michael D
> <michael.d.kinney@intel.com>; lersek@redhat.com; macarl@microsoft.com
> Subject: Re: [edk2-devel] [PATCH] CryptoPkg/FltUsedLib: Add FltUsedLib for
> float.
> 
> On Tue, 14 Apr 2020 at 09:01, Jiang, Guomin <guomin.jiang@intel.com>
> wrote:
> >
> > Summarize current status:
> >
> > Problem Statement:
> > Openssl require _fltused to be defined as a constant anywhere floating
> point is used.
> > It may use float out of edk2 tree and need _fltused, for example,
> Microsoft’s OnScreenKeyboard and UiToolKit.
> >
> > Current Proposal as below:
> >
> > Proposal 1: Add FltUsed.c into exist library
> > Detail: Add FltUsed.c into EntryPointLib(PEIM, DXE).
> > Recommend: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> > Approve: Laszlo Ersek lersek@redhat.com
> > Netual: Michael D Kinney <michael.d.kinney@intel.com>
> > Benefit: Doesn’t need modify every .dsc description file.
> > Defection: I test that it will fail because of /GL option, the error
> > show fatal error LNK1237: during code generation, compiler introduced
> > reference to symbol '_fltused' defined in module
> > 'UefiApplicationEntryPoint.lib(FltUsed.obj)' compiled with /GL
> >
> 
> Can you elaborate on this issue? What does /GL do, and why is it throwing
> this error?
> 
>