Re: Building GNUstep for Windows using Clang

[Frederik Seiffert]

Hi all,

As a second option I’ve been working on trying to build using the MSVC ABI 
(i.e. without MinGW).

Using the latest Clang 11 from the LLVM website and Pthreads-win32, plus 
removing -lm from target.make, I was able to get quite a bit further running 
Base configure.

However, it fails checking for objc_sync_enter with the following linker errors 
– any ideas what these could be about?

> configure:8038: checking for objc_sync_enter
> configure:8038: /C/LLVM/bin/clang -o conftest.exe -g  
> -I/c/GNUstep/MSVC/x64/include -I/c/GNUstep/MSVC/x64/include 
> -I/c/GNUstep/MSVC/x64/include -I/c/GNUstep/MSVC/x64/include  -x objective-c 
> -fuse-ld=lld -L/c/GNUstep/MSVC/x64/lib -L/c/GNUstep/MSVC/x64/lib 
> -L/c/GNUstep/MSVC/x64/lib -L/c/GNUstep/MSVC/x64/lib conftest.c  -lpthread 
> -fuse-ld=lld -pthread -fexceptions -fobjc-runtime=gnustep-2.0 -fblocks 
> -L/home/Frederik -LSeiffert/GNUstep/Library/Libraries 
> -L/c/GNUstep/MSVC/x64/lib -lobjc     >&5
> conftest.c:119:6: warning: incompatible redeclaration of library function 
> 'objc_sync_enter' [-Wincompatible-library-redeclaration]
> char objc_sync_enter ();
>      ^
> conftest.c:119:6: note: 'objc_sync_enter' is a builtin with type 'int (id)'
> 1 warning generated.
> lld-link: error: relocation against symbol in discarded section: 
> __start_.objcrt$SEL
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __stop.objcrt$SEL
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __start_.objcrt$CLS
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __stop.objcrt$CLS
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __start_.objcrt$CLR
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __stop.objcrt$CLR
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __start_.objcrt$CAT
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __stop.objcrt$CAT
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __start_.objcrt$PCL
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __stop.objcrt$PCL
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __start_.objcrt$PCR
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __stop.objcrt$PCR
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __start_.objcrt$CAL
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __stop.objcrt$CAL
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __start_.objcrt$STR
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> 
> lld-link: error: relocation against symbol in discarded section: 
> __stop.objcrt$STR
> >>> referenced by C:\tmp\conftest-78a937.o:(.objc_init)
> PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash 
> backtrace.
> 0.    Program arguments: C:\LLVM\bin\lld-link -out:conftest.exe 
> -defaultlib:libcmt -libpath:C:\Program Files (x86)\Microsoft Visual 
> Studio\2019\Professional\VC\Tools\MSVC\14.28.29333\lib\x64 
> -libpath:C:\Program Files (x86)\Microsoft Visual 
> Studio\2019\Professional\VC\Tools\MSVC\14.28.29333\atlmfc\lib\x64 
> -libpath:C:\Program Files (x86)\Windows Kits\10\Lib\10.0.18362.0\ucrt\x64 
> -libpath:C:\Program Files (x86)\Windows Kits\10\Lib\10.0.18362.0\um\x64 
> -libpath:C:\LLVM\lib\clang\11.0.0\lib\windows 
> -libpath:C:/GNUstep/MSVC/x64/lib -libpath:C:/GNUstep/MSVC/x64/lib 
> -libpath:C:/GNUstep/MSVC/x64/lib -libpath:C:/GNUstep/MSVC/x64/lib 
> -libpath:C:/msys64/home/Frederik -libpath:Seiffert/GNUstep/Library/Libraries 
> -libpath:C:/GNUstep/MSVC/x64/lib -nologo -debug C:\tmp\conftest-76158a.o 
> pthread.lib objc.lib 


> configure:8038: result: no
> configure:8052: error: The objc runtime library does not appear to have 
> synchronisation support.  Try re-configuring gnustep-make with a CPPFLAGS 
> variable containing a -L point to specify the directory containing the 
> correct libobjc, or using the --with-objc-lib-flag=... option.


Thanks,
Frederik