[edk2-devel] [2021-gsoc-llvm-gnumake]: proposal for building using llvm/gnumake

Fri Aug 13 19:50:10 UTC 2021

Hi Steven,

Have you considered using the --rtlib switch? It would eliminate the
dependency on the system's libgcc, crtbegin/end.o and crti/o.o, for most
systems. I don't know exactly how the build system works but I assume
there's some way to force a compiler flag.

Best regards,

Pedro

On Fri, 13 Aug 2021 at 14:34, Steven Shi <steven.shi at intel.com> wrote:

> Liming,
>
> The MSVC is required only because the Windows SDK Universal C runtime
> (UCRT) library depends on the MSVC.  Please see the dependency description
> here: “When you install Visual C++, Visual Studio setup installs the subset
> of the Windows 10 SDK required to use the UCRT.”
> https://docs.microsoft.com/en-us/cpp/c-runtime-library/crt-library-features?view=msvc-160.
>
>
>
>
> If the MSVC is not installed, the ucrt will complain cannot find the msvc
> header files. Below is an example:
>
> C:\Program Files\LLVM\bin\clang  -c  -I .. -I ../Include/Common -I
> ../Include/ -I ../Include/IndustryStandard -I ../Common/ -I .. -I . -I
> ../Include/X64/ -I "" -MD -fshort-wchar -fno-strict-aliasing -fwrapv
> -fno-delete-null-pointer-checks -Wall -Werror -Wno-deprecated-declarations
> -Wno-self-assign -Wno-unused-result -nostdlib -Wno-unused-function -g -m32
> -O2  BasePeCoff.c -o BasePeCoff.o
>
> In file included from BasePeCoff.c:13:
>
> In file included from ../Common\CommonLib.h:14:
>
> In file included from C:\Program Files (x86)\Windows
> Kits\10\Include\10.0.10240.0\ucrt\assert.h:12:
>
> C:\Program Files (x86)\Windows
> Kits\10\Include\10.0.10240.0\ucrt\corecrt.h:10:10: fatal error:
> 'vcruntime.h' file not
>
>       found
>
> #include <vcruntime.h>
>
>          ^~~~~~~~~~~~~
>
> 1 error generated.
>
>
>
>
>
>
>
> BTW, the compiler dependency requirement also exists in Linux side. Below
> is the Linux GCC CRT library example. Although I build with clang, it still
> needs link the crt libraries in GCC installation. Below is an example:
>
> $
> /home/jshi19/llvm/clang+llvm-11.0.0-x86_64-linux-gnu-ubuntu-20.04/bin/clang
> -o ../bin/LzmaCompress   LzmaCompress.o Sdk/C/Alloc.o Sdk/C/LzFind.o
> Sdk/C/LzmaDec.o Sdk/C/LzmaEnc.o Sdk/C/7zFile.o Sdk/C/7zStream.o
> Sdk/C/Bra86.o -L../libs -lCommon -###
>
> clang version 11.0.0 (https://github.com/llvm/llvm-project.git
> 0160ad802e899c2922bc9b29564080c22eb0908c)
>
> Target: x86_64-unknown-linux-gnu
>
> Thread model: posix
>
> InstalledDir:
> /home/jshi19/llvm/clang+llvm-11.0.0-x86_64-linux-gnu-ubuntu-20.04/bin
>
> "/usr/bin/ld" "-z" "relro" "--hash-style=gnu" "--eh-frame-hdr" "-m"
> "elf_x86_64" "-dynamic-linker" "/lib64/ld-linux-x86-64.so.2" "-o"
> "../bin/LzmaCompress"
> "/usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/crt1.o"
> "/usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/crti.o"
> "/usr/lib/gcc/x86_64-linux-gnu/10/crtbegin.o" "-L../libs"
> "-L/usr/lib/gcc/x86_64-linux-gnu/10"
> "-L/usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/lib/../lib64"
> "-L/usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu"
> "-L/lib/x86_64-linux-gnu" "-L/lib/../lib64" "-L/usr/lib/x86_64-linux-gnu"
> "-L/usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/lib"
> "-L/usr/lib/gcc/x86_64-linux-gnu/10/../../.."
> "-L/home/jshi19/llvm/clang+llvm-11.0.0-x86_64-linux-gnu-ubuntu-20.04/bin/../lib"
> "-L/lib" "-L/usr/lib" "LzmaCompress.o" "Sdk/C/Alloc.o" "Sdk/C/LzFind.o"
> "Sdk/C/LzmaDec.o" "Sdk/C/LzmaEnc.o" "Sdk/C/7zFile.o" "Sdk/C/7zStream.o"
> "Sdk/C/Bra86.o" "-lCommon" "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed"
> "-lc" "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed"
> "/usr/lib/gcc/x86_64-linux-gnu/10/crtend.o"
> "/usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/crtn.o"
>
>
>
>
>
>
>
>
>
> Thanks
>
>
>
> *Steven Shi*
>
> *Intel\SATG\SFP\FIA (Firmware Infrastructure Automation)*
>
>
>
>
>
> *From:* devel at edk2.groups.io <devel at edk2.groups.io> * On Behalf Of *
> gaoliming
> *Sent:* Friday, August 13, 2021 9:18 AM
> *To:* devel at edk2.groups.io; yuqi.chen at mail.utoronto.ca
> *Subject:* 回复: [edk2-devel] [2021-gsoc-llvm-gnumake]: proposal for
> building using llvm/gnumake
>
>
>
> Yuqi:
>
>  On Windows, can Clang + make combination drop the dependency of Visual
> studio? If I don’t install Visual studio 2015 or 2017, I only install
> LLVM, can I fully compile BaseTools and Edk2 code?
>
>
>
> Thanks
>
> Liming
>
> *发件人**:* devel at edk2.groups.io <devel at edk2.groups.io> *代表 *Yuqi Chen
> *发送时间:* 2021年8月12日 9:52
> *收件人:* devel at edk2.groups.io
> *主题:* [edk2-devel] [2021-gsoc-llvm-gnumake]: proposal for building using
> llvm/gnumake
>
>
> *Hi,*   *I want to push my change to my codes to edk2-staging, yet it
> seems like I don’t have permission to do so:*
>
>   *My mentor and I have enabled edk2 building using llvm+make and
> gnumake+clang in windows command prompt. The attached patch indicates
> changes we made to make this happen.*
>
>
> I also attach the readme file to go through the steps to build Basetools.
>   *Please review our codes and thank you very much for your time.*   Best
> regards, Yuqi
>
>
>
> 
>
>

-- 
Pedro Falcato

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