[llvm-dev] build llvm fails under win7 x64/VS2017

[Dennis Luehring via llvm-dev]

>BUILD_SHARED_LIBS is definitely not supported with MSVC. I'm not even
>confident that LLVM_BUILD_LLVM_DYLIB

both does not work for me

BUILD_SHARED_LIBS breaks the build very early, few seconds after build start

LLVM_BUILD_LLVM_DYLIB comes up with "Not Supported" after waiting a long long time for the build to finish

i will stay with the static build

thx


Am 17.09.2018 um 19:32 schrieb Reid Kleckner:
> BUILD_SHARED_LIBS is definitely not supported with MSVC. I'm not even
> confident that LLVM_BUILD_LLVM_DYLIB will work well, despite various
> people's attempts to make it work. I would recommend static linking first,
> and then move on to the much harder problem of building a DLL that exports
> what you want.
>
> On Mon, Sep 17, 2018 at 7:04 AM Dennis Luehring via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> > i've read the following on https://llvm.org/docs/CMake.html
> > ....
> > BUILD_SHARED_LIBS is only recommended for use by LLVM developers.
> > If you want to build LLVM as a shared library, you should use the
> > LLVM_BUILD_LLVM_DYLIB option.
> > ....
> >
> > replacing BUILD_SHARED_LIBS with LLVM_LINK_LLVM_DYLIB fixed my build
> > problems
> >
> > my new build-config:
> >
> > cmake -Thost=x64 -G "Visual Studio 15 2017 Win64"
> > -DLLVM_TARGETS_TO_BUILD=host -DLLVM_INCLUDE_EXAMPLES=OFF
> > -DLLVM_INCLUDE_TESTS=OFF -DLLVM_INCLUDE_DOCS=OFF
> > -DLLVM_INCLUDE_TOOLS=OFF -DLLVM_BUILD_LLVM_DYLIB=ON ../llvm
> >
> > using BUILD_SHARED_LIBS with this config fails very early - is that
> > intended behavior or a config bug?
> >
> > the next thing i try is to use Ninja on my Win7x64/VS2017 - hope that
> > reduces the build-times (currently 1.5h for an full static build - but
> > im using an old pc)
> >
> >
> >
> > Am 17.09.2018 um 10:30 schrieb Dennis Luehring via llvm-dev:
> > > my build environment:
> > >
> > > Win7 x64
> > > VStudio 2017 Community Edition 15.8.4 (latest)
> > > CMake 3.12.1 (x86)
> > > git 2.19.0 (latest, x64)
> > > Python 2.7.2 (x86)
> > >
> > > my build steps:
> > >
> > > open VS2017 x64 developer command prompt
> > > cd D:\projects\fun\jit_tests
> > > mkdir llvm
> > > cd llvm
> > > git clone https://github.com/llvm-mirror/llvm
> > > mkdir llvm-build
> > > cd llvm-build
> > > cmake -G "Visual Studio 15 2017 Win64" -DBUILD_SHARED_LIBS=ON
> > > -DLLVM_TARGETS_TO_BUILD=host -DLLVM_ENABLE_WARNINGS=OFF
> > > -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_INCLUDE_TESTS=OFF
> > > -DLLVM_INCLUDE_DOCS=OFF ../llvm
> > > cmake --build .
> > >
> > > produces these errors and warnings while building
> > >
> > > CMake Warning at CMakeLists.txt:29 (message):
> > >     Visual Studio generators use the x86 host compiler by default, even
> > for
> > >     64-bit targets.  This can result in linker instability and out of
> > memory
> > >     errors.  To use the 64-bit host compiler, pass -Thost=x64 on the
> > CMake
> > >     command line.
> > > ...
> > > CMake Warning (dev) at utils/benchmark/CMakeLists.txt:3 (project):
> > >     Policy CMP0048 is not set: project() command manages VERSION
> > variables.
> > >     Run "cmake --help-policy CMP0048" for policy details.  Use the
> > > cmake_policy
> > >     command to set the policy and suppress this warning.
> > > -----> seems related to https://bugs.llvm.org/show_bug.cgi?id=38874
> > > ...
> > > CMake Warning at utils/benchmark/CMakeLists.txt:234 (message):
> > >     Using std::regex with exceptions disabled is not fully supported
> > >
> > > and later some linker errors
> > >
> > > LINK : fatal error LNK1104: cannot open file
> > > '..\..\Debug\lib\LLVMDemangle.lib'
> > >
> > [D:\projects\fun\jit_tests\llvm40\llvm40-build\lib\Support\LLVMSupport.vcxproj]
> > > ...
> > > LINK : fatal error LNK1104: cannot open file
> > > '..\..\..\lib\Debug\benchmark.lib'
> > >
> > [D:\projects\fun\jit_tests\llvm40\llvm40-build\utils\benchmark\src\benchmark_main.vcxproj]
> > > ...
> > > LINK : fatal error LNK1104: cannot open file
> > > '..\..\Debug\lib\LLVMDemangle.lib'
> > >
> > [D:\projects\fun\jit_tests\llvm40\llvm40-build\lib\Support\LLVMSupport.vcxproj]
> > > ...
> > > LINK : fatal error LNK1104: cannot open file
> > > '..\..\..\lib\Debug\benchmark.lib'
> > >
> > [D:\projects\fun\jit_tests\llvm40\llvm40-build\utils\benchmark\src\benchmark_main.vcxproj]
> > >
> > > i also tried to build LLVM 4 and 6 on a clean cloned version
> > > git checkout -b release_40
> > > git checkout -b release_60
> > >
> > > producing the very same warnings/errors and the build breaks
> > >
> > > in the end i've got 1 lib and 2 dlls - not what i've expected :)
> > >
> > >
> > > any ideas?
> > >
> > >
> > >
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