[libcxx] r323453 - [cmake] [libcxx] Call llvm_setup_rpath() when adding shared libraries.

Thu Jan 25 16:21:37 PST 2018

> On Jan 25, 2018, at 16:18, Duncan P. N. Exon Smith via cfe-commits <cfe-commits at lists.llvm.org> wrote:
> 
> 
> 
>> On Jan 25, 2018, at 13:07, Don Hinton <hintonda at gmail.com <mailto:hintonda at gmail.com>> wrote:
>> 
>> On Thu, Jan 25, 2018 at 12:54 PM, Chris Bieneman <beanz at apple.com <mailto:beanz at apple.com>> wrote:
>> Historically we have supported building libcxx without llvm-config available on the system.
>> 
>> In all likelihood the bots didn't fail because the bots do have llvm-config because we usually require an llvm build or source checkout in order to build and run the tests since tests depend on lit and gtest.
>> 
>> Ah, okay, but if the bots don't test/enforce this, does it make sense to continue to support building without llvm-config?
> 
> I didn't realize we didn't have a bot enforcing this.  I just made one:
> http://lab.llvm.org:8080/green/view/Libcxx/job/libcxx_master_cmake_standalone <http://lab.llvm.org:8080/green/view/Libcxx/job/libcxx_master_cmake_standalone>
> 
>> I don't want to break upstream users, but the alternative is to duplicate this logic across multiple sub-projects.  (see http://lists.llvm.org/pipermail/llvm-dev/2018-January/120707.html <http://lists.llvm.org/pipermail/llvm-dev/2018-January/120707.html> for a related rpath issue).
> 
> It's temporary though.  In the brave new world on GitHub with monorepo, the runtime libraries will be able to access a shared set of CMake configuration scripts.

Note that there's other stuff duplicated in the runtime libraries, such as preprocessor definitions (LLVM_... => __LIBCXX_...), that we'll never really be able to collapse.

>> 
>>  
>> 
>> 
>> -Chris
>> 
>> 
>>> On Jan 25, 2018, at 12:51 PM, Don Hinton <hintonda at gmail.com <mailto:hintonda at gmail.com>> wrote:
>>> 
>>> On Thu, Jan 25, 2018 at 12:29 PM, Duncan P. N. Exon Smith <dexonsmith at apple.com <mailto:dexonsmith at apple.com>> wrote:
>>> I don't really understand why, but our bots seemed to survive this:
>>> http://lab.llvm.org:8080/green/view/Libcxx/job/libcxx_master_cmake/2137/ <http://lab.llvm.org:8080/green/view/Libcxx/job/libcxx_master_cmake/2137/>
>>> 
>>> Console output is here:
>>> http://lab.llvm.org:8080/green/view/Libcxx/job/libcxx_master_cmake/2137/consoleFull <http://lab.llvm.org:8080/green/view/Libcxx/job/libcxx_master_cmake/2137/consoleFull>
>>> 
>>> That doesn't necessarily mean it's safe.  Does anyone know why this might have "worked"?
>>> 
>>> I'm not an expert, but llvm installs all of these cmake modules along side llvm-config, so if you find llvm-config, you find these modules.
>>> 
>>> So, unless I'm missing something, it looks like AddLLVM.cmake is always available.
>>>  
>>> 
>>>> On Jan 25, 2018, at 11:02, Shoaib Meenai <smeenai at fb.com <mailto:smeenai at fb.com>> wrote:
>>>> 
>>>> This is going to break building libc++ standalone (i.e. without any LLVM repository or even its CMake modules), right? Some upstream users care a lot about that use case (CC beanz and Duncan).
>>>>  
>>>> From: cfe-commits <cfe-commits-bounces at lists.llvm.org <mailto:cfe-commits-bounces at lists.llvm.org>> on behalf of Don Hinton via cfe-commits <cfe-commits at lists.llvm.org <mailto:cfe-commits at lists.llvm.org>>
>>>> Reply-To: Don Hinton <hintonda at gmail.com <mailto:hintonda at gmail.com>>
>>>> Date: Thursday, January 25, 2018 at 10:15 AM
>>>> To: "cfe-commits at lists.llvm.org <mailto:cfe-commits at lists.llvm.org>" <cfe-commits at lists.llvm.org <mailto:cfe-commits at lists.llvm.org>>
>>>> Subject: [libcxx] r323453 - [cmake] [libcxx] Call llvm_setup_rpath() when adding shared libraries.
>>>>  
>>>> Author: dhinton
>>>> Date: Thu Jan 25 10:13:26 2018
>>>> New Revision: 323453
>>>>  
>>>> URL: https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_viewvc_llvm-2Dproject-3Frev-3D323453-26view-3Drev&d=DwIGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=zwvSmk9ZIfMARYg3JvYvNuA0Iz-PEq3H2i_ICF6vsR8&s=LDCu89byjNdZWoCIYHGHaPr3IamIdHLF0JwbnYE92vM&e= <https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_viewvc_llvm-2Dproject-3Frev-3D323453-26view-3Drev&d=DwIGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=zwvSmk9ZIfMARYg3JvYvNuA0Iz-PEq3H2i_ICF6vsR8&s=LDCu89byjNdZWoCIYHGHaPr3IamIdHLF0JwbnYE92vM&e=>
>>>> Log:
>>>> [cmake] [libcxx] Call llvm_setup_rpath() when adding shared libraries.
>>>>  
>>>> Clang and llvm already use llvm_setup_rpath(), so this change will
>>>> help standarize rpath usage across all projects.
>>>>  
>>>> Differential Revision: https://urldefense.proofpoint.com/v2/url?u=https-3A__reviews.llvm.org_D42459&d=DwIGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=zwvSmk9ZIfMARYg3JvYvNuA0Iz-PEq3H2i_ICF6vsR8&s=YCR-YJBua5p-4IK05GjHoZUU7aN8UJAFzL2xaz7byyw&e= <https://urldefense.proofpoint.com/v2/url?u=https-3A__reviews.llvm.org_D42459&d=DwIGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=zwvSmk9ZIfMARYg3JvYvNuA0Iz-PEq3H2i_ICF6vsR8&s=YCR-YJBua5p-4IK05GjHoZUU7aN8UJAFzL2xaz7byyw&e=>
>>>>  
>>>> Modified:
>>>>     libcxx/trunk/lib/CMakeLists.txt
>>>>  
>>>> Modified: libcxx/trunk/lib/CMakeLists.txt
>>>> URL: https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_viewvc_llvm-2Dproject_libcxx_trunk_lib_CMakeLists.txt-3Frev-3D323453-26r1-3D323452-26r2-3D323453-26view-3Ddiff&d=DwIGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=zwvSmk9ZIfMARYg3JvYvNuA0Iz-PEq3H2i_ICF6vsR8&s=Rd7xc2GWS8oyDcm0QshNPTqM3BglPY5_aHMIuCRUt1s&e= <https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_viewvc_llvm-2Dproject_libcxx_trunk_lib_CMakeLists.txt-3Frev-3D323453-26r1-3D323452-26r2-3D323453-26view-3Ddiff&d=DwIGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=zwvSmk9ZIfMARYg3JvYvNuA0Iz-PEq3H2i_ICF6vsR8&s=Rd7xc2GWS8oyDcm0QshNPTqM3BglPY5_aHMIuCRUt1s&e=>
>>>> ==============================================================================
>>>> --- libcxx/trunk/lib/CMakeLists.txt (original)
>>>> +++ libcxx/trunk/lib/CMakeLists.txt Thu Jan 25 10:13:26 2018
>>>> @@ -222,6 +222,7 @@ set(LIBCXX_TARGETS)
>>>> # Build the shared library.
>>>> if (LIBCXX_ENABLE_SHARED)
>>>>    add_library(cxx_shared SHARED $<TARGET_OBJECTS:cxx_objects>)
>>>> +  llvm_setup_rpath(cxx_shared)
>>>>    target_link_libraries(cxx_shared ${LIBCXX_LIBRARIES})
>>>>    set_target_properties(cxx_shared
>>>>      PROPERTIES
>>>>  
>>>>  
>>>> _______________________________________________
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>>>> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.llvm.org_cgi-2Dbin_mailman_listinfo_cfe-2Dcommits&d=DwIGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=zwvSmk9ZIfMARYg3JvYvNuA0Iz-PEq3H2i_ICF6vsR8&s=TPt8bk99XfmUCdi7MBxyguYV6hJg3PsXFCTXyDfGms8&e= <https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.llvm.org_cgi-2Dbin_mailman_listinfo_cfe-2Dcommits&d=DwIGaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=zwvSmk9ZIfMARYg3JvYvNuA0Iz-PEq3H2i_ICF6vsR8&s=TPt8bk99XfmUCdi7MBxyguYV6hJg3PsXFCTXyDfGms8&e=>
>>>>  
>>> 
>>> 
>> 
>> 
> 
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