Cross-compiling for Windows

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Ubuntu, wine and Microsoft Visual C++

General setup

It seems that an Office extension for Windows must be compiled with MSVC to be compatible. Here is a way to do this from within Ubuntu. Make sure you have a recent wine installed. By default this will be a 64 bit version. If you need a 32-bit wine, use winearch='win32' winecfg.

Visual Studio 2017 or 2019 (64 bit compiler, outputting 32 bit or 64 bit code)

  • Get a working Visual Studio installation under Windows (the community version is available for free, and works fine)
  • Set up the following file structure in your .wine/drive_c directory (for 32 bit wine, change Hostx64 to Hostx86 in the first two lines).
 vc/bin/x64 from C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\XX.YY.ZZZZZ\bin\Hostx64\x64
 vc/bin/x86 from C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\XX.YY.ZZZZZ\bin\Hostx64\x86
 vc/lib/x64 from C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\XX.YY.ZZZZZ\lib\x64
 vc/lib/x86 from C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\XX.YY.ZZZZZ\lib\x86
 vc/include from C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\XX.YY.ZZZZZ\include
 vc/sdk/lib/ucrt/x64 from C:\Program Files (x86)\Windows Kits\10\Lib\10.0.16299.0\ucrt\x64
 vc/sdk/lib/ucrt/x86 from C:\Program Files (x86)\Windows Kits\10\Lib\10.0.16299.0\ucrt\x86
 vc/sdk/lib/um/x64 from C:\Program Files (x86)\Windows Kits\10\Lib\10.0.16299.0\um\x64
 vc/sdk/lib/um/x86 from C:\Program Files (x86)\Windows Kits\10\Lib\10.0.16299.0\um\x86
 vc/sdk/include/ucrt from C:\Program Files (x86)\Windows Kits\10\Include\10.0.16299.0\ucrt
 vc/sdk/include/um from C:\Program Files (x86)\Windows Kits\10\Include\10.0.16299.0\um
 vc/sdk/include/shared from C:\Program Files (x86)\Windows Kits\10\Include\10.0.16299.0\shared
 vc/sdk/include/ucrt/sys/time.h: link to ../time.h
  • If you change this structure you must also adapt the .configure calls later
  • If you are only targeting x64 or x86 you can omit the other architecture
  • Run wine regedit and add to HKEY_CURRENT_USER\Environment the entry PATH:
    • 64 bit host, 64 bit target: C:\vc\bin\x64
    • 64 bit host, 32 bit target: C:\vc\bin\x86;C:\vc\bin\x64

wine cl, wine link and wine lib should now work.

Debug build

  • To get a debug build, use the flags -MDd -D_DEBUG for libraries
  • You will need to copy the debug versions of the standard libraries into the paths

Compiling CLN

You must use a recent CLN (>1.3.6)

If the linker reports undefined symbols, try to remove the inlined methods cl_string::cl_string (const char * s) and cl_string& cl_string::operator= (const char * s) from include/cln/string.h and instead defining them in src/base/string/cl_st_make2.cc. The extern definitions can be removed from these two methods.

If compilation fails on the two assembler files, remove the following lines from src/Makefile.am: 

 nodist_libcln_la_SOURCES = \
 base/digitseq/cl_asm.S \
 polynomial/elem/cl_asm_GF2.S

Visual Studio 2017 and 2019

  • Run autoreconf -i
  • Configure the build
    • 64 bit build: ./configure CC="wine cl" CXX="wine cl" CCAS="wine cl" LD="wine link" LIB="C:/vc/lib/x64;C:/vc/sdk/lib/um/x64;C:/vc/sdk/lib/ucrt/x64" CPPFLAGS="-MD -DNO_ASM -EHsc -IC:/vc/include -IC:/vc/sdk/include/um -IC:/vc/sdk/include/ucrt -IC:/vc/sdk/include/shared" --host=amd64-mingw64msvc
    • 32 bit build: ./configure CC="wine cl" CXX="wine cl" CCAS="wine cl" LD="wine link" LIB="C:/vc/lib/x86;C:/vc/sdk/lib/um/x86;C:/vc/sdk/lib/ucrt/x86" CPPFLAGS="-MD -DNO_ASM -EHsc -IC:/vc/include -IC:/vc/sdk/include/um -IC:/vc/sdk/include/ucrt -IC:/vc/sdk/include/shared" --host=i586-mingw32msvc
  • Edit libtool and find the two lines containing -OUT. Replace lib with wine lib
  • Make one of these changes (depending on what source version you have only one is possible)
    • Edit the src/Makefile and find the line starting with .S.lo and add the switch -TC before -c -o
    • Remove the definition of nodist_libcln_la_SOURCES from src/Makefile.am (total three lines) and re-run configure
  • Build
    • 64 bit build: make LIB="C:/vc/lib/x64;C:/vc/sdk/lib/um/x64;C:/vc/sdk/lib/ucrt/x64"
    • 32 bit build: make LIB="C:/vc/lib/x86;C:/vc/sdk/lib/um/x86;C:/vc/sdk/lib/ucrt/x86"
  • Check
    • 64 bit build: make LIB="C:/vc/lib/x64;C:/vc/sdk/lib/um/x64;C:/vc/sdk/lib/ucrt/x64" check
    • 32 bit build: make LIB="C:/vc/lib/x86;C:/vc/sdk/lib/um/x86;C:/vc/sdk/lib/ucrt/x86" check
  • All tests should pass successfully (note that on a 64-bit wine, the 32-bit tests will not execute). If they do not, you might need to install the package wine-binfmt

Compiling GiNaC

For a 64 bit build, you need a recent version of GiNaC (>1.7.8).

If compilation fails with reference to a missing C++20 compiler, edit the configure.ac and change the compiler prerequisite AX_CXX_COMPILE_STDCXX to version 20.

Visual Studio 2017 and 2019

  • Copy src/.libs/libcln.lib into ~/.wine/drive_c/local/lib/x64 (or x86) and the CLN headers in the include directory into ~/.wine/drive_c/local/include/x64/cln (or x86/cln)
  • Get a recent GiNaC (>= 1.8.2)
  • Run autoreconf -i in the source directory
  • Configure
    • 64 bit: ./configure CC="wine cl" CXX="wine cl" LD="wine link" CLN_CFLAGS=-IC:/local/include/x64 CLN_LIBS=C:/local/lib/x64/libcln.lib LIB="C:/vc/lib/x64;C:/vc/sdk/lib/um/x64;C:/vc/sdk/lib/ucrt/x64" CPPFLAGS="-MD -EHsc -Zc:__cplusplus -IC:/vc/include -IC:/vc/sdk/include/um -IC:/vc/sdk/include/ucrt -IC:/local/include" --disable-shared --enable-static --host=amd64-mingw64msvc
    • 32 bit: ./configure CC="wine cl" CXX="wine cl" LD="wine link" CLN_CFLAGS=-IC:/local/include/x86 CLN_LIBS=C:/local/lib/x86/libcln.lib LIB="C:/vc/lib/x86;C:/vc/sdk/lib/um/x86;C:/vc/sdk/lib/ucrt/x86" CPPFLAGS="-MD -EHsc -IC:/vc/include -IC:/vc/sdk/include/um -IC:/vc/sdk/include/ucrt -IC:/local/include" --disable-shared --enable-static --host=i586-mingw32msvc
  • Edit the libtool created by configure:
    • The line starting with old_archive_cmds must read "wine lib -OUT:\$oldlib\$oldobjs\$old_deplibs". Note that this line occurs twice in the file!
  • Build
    • 64 bit: make LIB="C:/vc/lib/x64;C:/vc/sdk/lib/um/x64;C:/vc/sdk/lib/ucrt/x64"
    • 32 bit: make LIB="C:/vc/lib/x86;C:/vc/sdk/lib/um/x86;C:/vc/sdk/lib/ucrt/x86"
  • On Windows compilation will fail in the ginsh subdirectory. Simply cd to this directory and run make -t (since we won't be needing ginsh)
  • Change to the toplevel directory again and finish the build with the same make command as before
  • Check
    • 64 bit: make LIB="C:/vc/lib/x64;C:/vc/sdk/lib/um/x64;C:/vc/sdk/lib/ucrt/x64" check
    • 32 bit: make LIB="C:/vc/lib/x86;C:/vc/sdk/lib/um/x86;C:/vc/sdk/lib/ucrt/x86" check
  • All tests should pass successfully (note that on 64 bit wine the 32 bit tests will not execute)

Preparing the Office SDK

  • Install Office and the Office SDK into wine using the standard Windows installation files. Try to run ~/.wine/drive_c/Program Files/<YOUR_OFFICE>/program/soffice.exe, if this doesn't start, then install it into a clean wine.
  • Remember to install 64-bit versions of the Office and SDK if you set up a 64-bit Visual C++ environment
  • In the SDK base directory (e.g. ~/.wine/drive_c/Program Files/<YOUR_OFFICE>/sdk), edit settings/dk.mk and change the platform PLATFORM=wine (for Apache OpenOffice, create a file called config.guess in the sdk subdirectory with contents echo wine; exit 0)
  • Edit settings/settings.mk and add a section for wine. The iMath source subdirectory src/wine-sdk-config contains a sample that works for me, but keep in mind that the settings.mk file varies between SDK versions.
  • Go to sdk/bin and create an executable called cppumaker with content wine "$OO_SDK_HOME/bin/cppumaker.exe" "$@"
  • Install the Office DLLs where wine can find them (e.g. symlink into the sdk/bin directory) but not into ~/.wine/drive_c/windows/system32, because this will confuse the office. This is required for cppumaker.exe to run

Compiling iMath

Copy libginac.lib into ~/.wine/drive_c/local/lib/x64 (or x86) and the GiNaC headers (also from the parser subdirectory) into ~/.wine/drive_c/local/include/x64/ginac (or x86/ginac)

  • Because GNU make has problems with spaces in paths, it is strongly advisable to create a symlink to ~/.wine/drive_c/Program\ Files and any other directory that has spaces (e.g. LibreOffice\ 5)
  • Edit the config.wine file matching your Office installation in the directory src/wine-sdk-config. Set BASE= to match your wine installation directory. Edit the relevant entries at the top of the file using the symlinked directory names without spaces
  • Source this config.wine.xxx file
  • Run autoreconf -i
  • 32 bit build: Run ./configure CC="wine cl" CXX="wine cl" LD="wine cl" --host=i586-mingw32msvc
  • 64 bit build: Run ./configure CC="wine cl" CXX="wine cl" LD="wine cl" --host=amd64-mingw64msvc
  • Change into the source directory
  • Run make. This will produce an error about mt.exe at the end of the process. Just run make again and the extension is created in the iMathout directory
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