[llvm-dev] Shipping LLVM.dll for the C API with the Windows installer.

Mon Jul 10 06:20:40 PDT 2017

Thanks for starting!
Btw here is my CMD version:

cmd /Q /V:ON /c "for /F "tokens=4" %l in ('dir llvm*.lib') do (for /F
"tokens=2" %e in ('dumpbin /linkermember:1 %l ^| findstr "_LLVM"') do (set
symbolname=%e & echo !symbolname:~1!))"

You run it in the directory with all the llvm*.lib (yes the ThinLTO is
excluded in this example but can be added easily i think)

2017-07-06 20:16 GMT+02:00 Jakob Bornecrantz <wallbraker at gmail.com>:

> Made a bit of headway here: https://reviews.llvm.org/D35077
>
> Cheers, Jakob.
>
> On Thu, Apr 6, 2017 at 2:34 PM, Alexander Benikowski
> <sebal007 at googlemail.com> wrote:
> > Maybe someone can use this as a startingpoint to add the windows-specific
> > commandblock which is triggered instead of the Darwin one together with a
> > proper setup of targets to have the libs build before.
> >
> > 2017-04-06 14:30 GMT+02:00 Alexander Benikowski <sebal007 at googlemail.com
> >:
> >>
> >> The following is an older commandline i used. Have a more recent one at
> >> home. But basically you can write it as batch and trigger it within a
> target
> >> during the build(never got targets into correct order, i am a cmake
> noob)
> >>
> >> So for reference, i'll post this one and look for the recent one at
> >> home(if that didn't go down with my recent hdd crash):
> >>
> >> cmd /Q /V:ON /c "for /F "tokens=4" %l in ('dir llvm*.lib') do (for /F
> >> "tokens=2" %e in ('dumpbin /linkermember:1 %l ^| findstr "_LLVM"') do
> (set
> >> symbolname=%e & echo !symbolname:~1!))"
> >>
> >> What it does:
> >>
> >> For all *.lib files ina specific dir starting with LLVM call dumpbin.exe
> >> (tool from Visualstudio) and write all symbols with LLVM_ into a
> specific
> >> file
> >>
> >>
> >> 2017-04-05 20:40 GMT+02:00 Jakob Bornecrantz via llvm-dev
> >> <llvm-dev at lists.llvm.org>:
> >>>
> >>> On Wed, Apr 5, 2017 at 5:20 PM, John Brawn <John.Brawn at arm.com> wrote:
> >>> > We already half-have this, the LLVM_BUILD_LLVM_C_DYLIB cmake option
> >>> > builds
> >>> > a shared object which exports the llvm-c interface but it only works
> on
> >>> > Darwin.
> >>> >
> >>> > tools/llvm-shlib/CMakeLists.txt is where how this is done is
> defined,
> >>> > and it
> >>> > looks like it does it by:
> >>> >  * build LLVM.so
> >>> >  * use nm+awk+sed to pick out the symbols starting with LLVM
> >>> >  * build LLVM-C.so using a -reexport_library linker option
> >>> >
> >>> > I'm thinking that maybe we could make this not-darwin-specific by
> >>> > making
> >>> > use of utils/extract_symbols.py:
> >>> >  * edit extract_symbols.py to add a --only_unmangled option (or maybe
> >>> >    --only_prefix=LLVM or something like that)
> >>> >  * on non-darwin use that instead of the existing command to get the
> >>> >    symbols to export (or: make extract_symbols.py work on Darwin)
> >>> >  * instead of building LLVM-C.so from LLVM.so using this
> >>> > -reexport_library
> >>> >    option, instead build LLVM-C.so from the same libraries that
> LLVM.so
> >>> >    is built from
> >>> >  (where I use .so above, it also applies to .dll)
> >>> >
> >>> > John
> >>>
> >>> Thanks for the info John!
> >>>
> >>> I tried to enable LLVM_BUILD_LLVM_C_DYLIB on my linux machine
> >>> to play around a little bit. I disabled the APPLE check to get past
> that.
> >>> The config failed if I had BUILD_SHARED_LIBS also set to true.
> >>> If I tried that without the flag it complained about missing:
> >>> builddir/./lib/libLLVM.so
> >>>
> >>> Which is a bit weird since it builds a lib/libLLVM-5.0svn.so.
> >>>
> >>> I have to admit I'm a tiny bit in over my head here with the cmake
> >>> scripts here.
> >>>
> >>> Cheers, Jakob.
> >>>
> >>> >
> >>> >> -----Original Message-----
> >>> >> From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf
> Of
> >>> >> Jakob Bornecrantz via llvm-dev
> >>> >> Sent: 05 April 2017 12:51
> >>> >> To: llvm-dev
> >>> >> Subject: Re: [llvm-dev] Shipping LLVM.dll for the C API with the
> >>> >> Windows
> >>> >> installer.
> >>> >>
> >>> >> On Thu, Mar 30, 2017 at 4:46 PM, Jakob Bornecrantz
> >>> >> <wallbraker at gmail.com> wrote:
> >>> >> > Hello list!
> >>> >> >
> >>> >> > So I'm wondering if there is a will to ship a DLL with the C API
> >>> >> > exported? LLVM currently ships with LTO.dll which has some C api
> >>> >> > functions exported, made from the export file
> tools/lto/lto.exports,
> >>> >> > so it would not be the first DLL LLVM shipped.
> >>> >> >
> >>> >> > Currently I (and the users of my project[1]) are building it
> >>> >> > ourselves
> >>> >> > using this script[2] derived from the LLVMSharp script[3]. Which
> >>> >> > adds
> >>> >> > a extra long step for all users of ours and other projects like
> >>> >> > LLVMSharp in order to use them.
> >>> >> >
> >>> >> > The resulting LLVM.dll exports 809 functions and weighs in at
> around
> >>> >> > 18mb, so it would make the installer larger. There is also the
> cost
> >>> >> > of
> >>> >> > maintaining a lists of export for the DLL, but hopefully we can
> use
> >>> >> > the llvm-echo to test it on the windows nodes so any failure to
> add
> >>> >> > new exports gets detected early.
> >>> >> >
> >>> >> > Now for the bike-shed questions, do we call it LLVM-c.dll or just
> >>> >> > LLVM.dll? Annotate all functions with a LLVM_EXPORT define or use
> a
> >>> >> > llvm-c.exports file?
> >>> >> >
> >>> >> > Thoughts and feedback welcome.
> >>> >> >
> >>> >> > Cheers, Jakob.
> >>> >> >
> >>> >> > [1] http://volt-lang.org
> >>> >> > [2]
> >>> >> > https://github.com/VoltLang/GenLLVMDLLPy/blob/master/
> GenLLVMDLL.py
> >>> >> > [3]
> >>> >>
> >>> >> https://github.com/Microsoft/LLVMSharp/blob/master/tools/
> GenLLVMDLL.ps1
> >>> >>
> >>> >> Ping? Any thoughts?
> >>> >>
> >>> >> What would be the best way to proceed? My cmake-fu is very weak so
> any
> >>> >> pointers here from those knowledgeable and stakeholders in the code
> >>> >> would be greatly appreciated.
> >>> >>
> >>> >> Cheers, Jakob.
> >>> >> _______________________________________________
> >>> >> LLVM Developers mailing list
> >>> >> llvm-dev at lists.llvm.org
> >>> >> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >>> _______________________________________________
> >>> LLVM Developers mailing list
> >>> llvm-dev at lists.llvm.org
> >>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >>
> >>
> >
>
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