llvm dev - Jan 2016 - Building SVN head with CMake - shared libraries?

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
>
> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
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On 14 January 2016 at 11:24, David Jones via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> Thanks - I'll try this tonight.
>
> Assuming it works, should these variables be added to the docs at
> http://llvm.org/docs/CMake.html ?
Yes.

We should probably be updating [1] too given that this document talks
exclusively about compiling with the Autoconf/Makefile build system.

@Hans @Chris:

Should the packaging instructions refer to the CMake or
Autoconf/Makefile build system for the LLVM 3.8 release?


[1] http://llvm.org/docs/Packaging.html

> On Jan 14, 2016, at 5:18 AM, Dan Liew <dan at su-root.co.uk> wrote:
> 
> On 14 January 2016 at 11:24, David Jones via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
>> Thanks - I'll try this tonight.
>> 
>> Assuming it works, should these variables be added to the docs at
>> http://llvm.org/docs/CMake.html ?
> 
> Yes.
It probably makes sense to add LLVM_BUILD_LLVM_DYLIB, but I would discourage
adding BUILD_SHARED_LIBS to that document. BUILD_SHARED_LIBS is rarely what
people actually want, and a lot of people gravitate to it because the wording is
similar to the autoconf —enable-shared flag.
> 
> We should probably be updating [1] too given that this document talks
> exclusively about compiling with the Autoconf/Makefile build system.
Yes, we should update that too. I actually have been meaning to put a section up
there documenting the Apple Clang packaging because that is almost entirely open
source now. I’ll try to get that done this week.
> 
> @Hans @Chris:
> 
> Should the packaging instructions refer to the CMake or
> Autoconf/Makefile build system for the LLVM 3.8 release?
Maybe, I’ll defer that to Hans. I believe the packaging scripts are on CMake, so
we’ve at least gotten that far.
> 
> 
> [1] http://llvm.org/docs/Packaging.html

On Thu, 14 Jan 2016 at 19:24 David Jones <djones at xtreme-eda.com> wrote:
> Thanks - I'll try this tonight.
>
> Assuming it works, should these variables be added to the docs at
> http://llvm.org/docs/CMake.html ?
>
http://reviews.llvm.org/D16208

Cheers,
Andrew

>
> 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
>>
>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
>>
>
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On 15 January 2016 at 01:36, Andrew Wilkins via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> On Thu, 14 Jan 2016 at 19:24 David Jones <djones at xtreme-eda.com>
wrote:
>>
>> Thanks - I'll try this tonight.
>>
>> Assuming it works, should these variables be added to the docs at
>> http://llvm.org/docs/CMake.html ?
>
>
> http://reviews.llvm.org/D16208
That got accepted before I could review it.

I have left some comments with suggestions on how to improve what has
been committed to trunk.

http://reviews.llvm.org/D16208