[llvm-dev] Building SVN head with CMake - shared libraries?

[David Jones via llvm-dev]

Thanks - I'll try this tonight.

Assuming it works, should these variables be added to the docs at
http://llvm.org/docs/CMake.html ?



On Wed, Jan 13, 2016 at 10:26 PM, Andrew Wilkins <axwalk at gmail.com> wrote:

>
>
> On Thu, 14 Jan 2016 at 11:02 David Jones via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Now that autoconf is going away soon, I figured I'd try building using
>> CMake.
>>
>> I checked out llvm, cfe and lldb from the SVN server, and followed the
>> basic build instructions.
>>
>> cmake -DBUILD_SHARED_LIBS=OFF -DCMAKE_INSTALL_PREFIX=/tools/llvm/svn_head
>> -DLLVM_TARGETS_TO_BUILD="X86;CppBackend" -DCMAKE_BUILD_TYPE=Release
>> -DLLVM_ENABLE_ASSERTIONS=ON ../llvm
>>
>> Everything worked well, and in the end I got the following shared
>> libraries:
>>
>> /tools/llvm/svn_head/lib/BugpointPasses.so
>> /tools/llvm/svn_head/lib/libclang.so
>> /tools/llvm/svn_head/lib/libclang.so.3.9
>> /tools/llvm/svn_head/lib/liblldb.so
>> /tools/llvm/svn_head/lib/liblldb.so.3.9.0
>> /tools/llvm/svn_head/lib/libLTO.so
>> /tools/llvm/svn_head/lib/LLVMHello.so
>>
>> However, with an autoconf build, I am used to seeing a libLLVM.so. From a
>> 3.7.1 autoconf build:
>>
>> /tools/llvm/3.7.1dbg/lib/BugpointPasses.so
>> /tools/llvm/3.7.1dbg/lib/libclang.so
>> /tools/llvm/3.7.1dbg/lib/liblldb.so
>> /tools/llvm/3.7.1dbg/lib/libLLVM-3.7.1.so
>> /tools/llvm/3.7.1dbg/lib/libLLVM-3.7.so
>> /tools/llvm/3.7.1dbg/lib/libLTO.so
>> /tools/llvm/3.7.1dbg/lib/LLVMHello.so
>>
>> I'd like to get libLLVM with the CMake build as well. But if I try
>> -DBUILD_SHARED_LIBS=ON, lldb-server fails to link properly and I cannot
>> install anything.
>>
>> Is this a bug in the make scripts for lldb-server?
>> How can I get libLLVM.so in addition to liblldb.so?
>>
>
> -DBUILD_SHARED_LIBS=ON will give you shared libraries for each component
> (libLLVMSupport.so instead of libLLVMSupport.a, etc.)
>
> What you want to set is -DLLVM_BUILD_LLVM_DYLIB=ON. For this to work, you
> must *not* set -DBUILD_SHARED_LIBS=ON.
>
> If you also want all the tools (clang, llvm-*, etc.) to link against
> libLLVM.so, you'll want to set -DLLVM_LINK_LLVM_DYLIB=ON, otherwise you'll
> have libLLVM.so but the tools will be linked against the static libraries.
>
> HTH,
> Andrew
>
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>
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