[TCLCORE] TK9.0 rc1 on Windows/arm64

[Jan M. <0x...@gm...>]

Hi list.

I'm still not able to produce working Tcl/Tk Windows arm64 dlls on Linux.

I'm using the latest llvm cross toolchain
(llvm-mingw-20240917-ucrt-ubuntu-20.04-x86_64.tar.xz
from https://github.com/mstorsjo/llvm-mingw/releases/tag/20240917).
The .configure && make
approach mostly works with some minor tweaks. This is the part of a
Makefile I'm using in my
project and the target I'm trying zo use for producing the Windows/arm64 stuff:

   130  lib_winarm64: download
   131          if [ "$(GOOS)" != "linux" ]; then exit 1 ; fi
   132          if [ "$(GOARCH)" != "amd64" ]; then exit 1 ; fi
   133          rm -rf ~/tmp/tcl9* ~/tmp/tk9* $(WINARM64)
   134          mkdir -p $(WINARM64)
   135          tar xf $(TAR) -C ~/tmp
   136          tar xf $(TAR2) -C ~/tmp
   137          sh -c "cd ~/tmp/tcl9.0.0/win ; ./configure
--build=x86_64-linux-gnu --host=aarch64-w64-mingw32
--enable-64bit=aarch64"
   138          sh -c "cd ~/tmp/tcl9.0.0/win ; sed -i
's/-DHAVE_CPUID=1/-UHAVE_CPUID/g' *"
   139          make -C ~/tmp/tcl9.0.0/win -j12
   140          cp -v
~/tmp/tcl9.0.0/libtommath/win64-arm/libtommath.dll
~/tmp/tcl9.0.0/compat/zlib/win64-arm/zlib1.dll ~/tmp/tcl9.0.0/win/
   141          cp -v ~/tmp/tcl9.0.0/win/*.dll $(WINARM64)
   142          sh -c "cd ~/tmp/tk9.0.0/win ; ./configure
--build=x86_64-linux-gnu --host=aarch64-w64-mingw32
--with-tcl=$$HOME/tmp/tcl9.0.0/win  --enable-64bit=aarch64"
   143          make -C ~/tmp/tk9.0.0/win -j12
   144          cp -v ~/tmp/tk9.0.0/win/tcl9tk90.dll
~/tmp/tk9.0.0/win/libtk9.0.0.zip $(WINARM64)
   145          zip -j $(WINARM64)/lib.zip.tmp $(WINARM64)/*.dll
$(WINARM64)/*.zip
   146          rm -f $(WINARM64)/*.dll $(WINARM64)/*.zip
   147          mv $(WINARM64)/lib.zip.tmp $(WINARM64)/lib.zip
   148

On lines 137 and 142 the '--enable-64bit=aarch64' works around
producing x86_64 dlls othewrwise.
However libtommath.dll and zlib1.dll produced in the win/ directory
are still x86_64 dlls. Hence line
140 takes the prebuilt ones instead. Line 138 patches out x86_64
CPUID. Without the patch the build fails:

    tclWin32Dll.c:472:2: error: unknown register name '%eax' in asm
     472 |         "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
         |         ^
    1 error generated.
make[1]: *** [Makefile:766: tclWin32Dll.o] Error 1

However, the preceding guard at tclWin32Dll:445 should have not been
taken, I think:

   #elif defined(__GNUC__) && defined(HAVE_CPUID)

Hence I suspect I have the configuration still wrong even with
--host=aarch64-w64-mingw32 as AFAIK,
HAVE_CPUID should not be defined when targeting aarch64 CPU.

When I try the results that correctly show being for Windows/arm64,
Tcl shell fails before prompt with "illegal instruction". The CPU used
for testing is Cortex-A72.

Please let me know if I can help somehow in solving this issue from
the Linux side, thanks.

-j