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List: cmake
Subject: Re: [CMake] OBJECT libraries and INTERFACE_SOURCES
From: Giovanni Funchal <gio () cloudnc ! co ! uk>
Date: 2016-12-09 16:25:31
Message-ID: CACs7uvbydQa3mpkdOUT6RdvJarReyRAPgyLX5MXciBW+AmZMfw () mail ! gmail ! com
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Hello,
PRIVATE works, but I don't understand why (the only difference between the
two examples is using a subdirectory).
Using ${CMAKE_CURRENT_SOURCE_DIR} does not work.
Thanks,
-- Giovanni
On Fri, Dec 9, 2016 at 4:17 PM, Chuck Atkins <chuck.atkins@kitware.com>
wrote:
> Hi Giovanni,
> Does it work if you add lib1 as a private dependency of lib2? i.e.:
> target_link_libraries(lib2 PRIVATE lib1)
>
> Also, it shouldn't matter but what about in your original example if you
> use the full path to the source file instead while still keeping the public
> link dependency? i.e.:
> add_library(lib1-obj OBJECT $(CMAKE_CURRENT_SOURCE_DIR}/lib1.cpp).
>
> ----------
> Chuck Atkins
> Staff R&D Engineer, Scientific Computing
> Kitware, Inc.
>
>
> On Fri, Dec 9, 2016 at 5:26 AM, Giovanni Funchal <gio@cloudnc.co.uk>
> wrote:
>
>> Hi,
>>
>> Apologies, the problem wasn't properly minimised because I had some
>> trouble wrapping my head around it. Here's two complete examples which I
>> hope can explain the problem better this time.
>>
>> 1) This works:
>>
>> [CMakeLists.txt]
>> cmake_minimum_required(VERSION 3.6)
>> project(Test)
>> add_library(lib1-obj OBJECT lib1.cpp)
>> add_library(lib1 INTERFACE)
>> set_target_properties(lib1 PROPERTIES INTERFACE_SOURCES
>> $<TARGET_OBJECTS:lib1-obj>)
>> add_library(lib2 lib2.cpp)
>> target_link_libraries(lib2 lib1)
>> add_executable(main main.cpp)
>> target_link_libraries(main lib2)
>>
>> 2) But this does not:
>>
>> [CMakeLists.txt]
>> cmake_minimum_required(VERSION 3.6)
>> project(Test)
>> add_library(lib1-obj OBJECT lib1.cpp)
>> add_library(lib1 INTERFACE)
>> set_target_properties(lib1 PROPERTIES INTERFACE_SOURCES
>> $<TARGET_OBJECTS:lib1-obj>)
>> add_library(lib2 lib2.cpp)
>> target_link_libraries(lib2 lib1)
>> add_subdirectory(main)
>>
>> [main/CMakeLists.txt]
>> add_executable(main main.cpp)
>> target_link_libraries(main lib2)
>>
>> With the second example, I get an error "cannot find source file
>> lib1.cpp.o tried extensions...".
>>
>> Thanks,
>> -- Giovanni
>>
>>
>> On Thu, Dec 8, 2016 at 9:56 PM, Stephen Kelly <steveire@gmail.com> wrote:
>>
>>> Giovanni Funchal wrote:
>>>
>>> > Hi,
>>> >
>>> > The help page [1] mentions that:
>>> >
>>> >> Although object libraries may not be named directly in calls to the
>>> >> target_link_libraries() command, they can be "linked" indirectly by
>>> >> using an Interface Library whose INTERFACE_SOURCES target property
>>> >> is set to name $<TARGET_OBJECTS:objlib>.
>>> >
>>> > However, I was unable to get this to work. Doing this:
>>> >
>>> > add_library(lib-obj OBJECT test.cpp)
>>> > add_library(lib INTERFACE)
>>> > add_dependencies(lib lib-obj)
>>> > set_target_properties(lib PROPERTIES INTERFACE_SOURCES
>>> > $<TARGET_OBJECTS:lib-obj>)
>>> >
>>> > And then trying to specify lib in link_libraries of an executable
>>> yields
>>> > an error message "Cannot find source file: ... Tried extensions:... ".
>>> >
>>> > Am I doing something wrong?
>>>
>>> This works for me:
>>>
>>> cmake_minimum_required(VERSION 3.3)
>>>
>>> project(testit CXX)
>>>
>>> add_library(lib-obj OBJECT foo.cpp)
>>> add_library(lib-iface INTERFACE)
>>> set_target_properties(lib-iface PROPERTIES
>>> INTERFACE_SOURCES $<TARGET_OBJECTS:lib-obj>
>>> )
>>> add_executable(main foo-user.cpp)
>>> target_link_libraries(main lib-iface)
>>>
>>>
>>> Thanks,
>>>
>>> Steve.
>>>
>>>
>>> --
>>>
>>> Powered by www.kitware.com
>>>
>>> Please keep messages on-topic and check the CMake FAQ at:
>>> http://www.cmake.org/Wiki/CMake_FAQ
>>>
>>> Kitware offers various services to support the CMake community. For more
>>> information on each offering, please visit:
>>>
>>> CMake Support: http://cmake.org/cmake/help/support.html
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>>>
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>>
>>
>>
>> --
>>
>> Powered by www.kitware.com
>>
>> Please keep messages on-topic and check the CMake FAQ at:
>> http://www.cmake.org/Wiki/CMake_FAQ
>>
>> Kitware offers various services to support the CMake community. For more
>> information on each offering, please visit:
>>
>> CMake Support: http://cmake.org/cmake/help/support.html
>> CMake Consulting: http://cmake.org/cmake/help/consulting.html
>> CMake Training Courses: http://cmake.org/cmake/help/training.html
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Follow this link to subscribe/unsubscribe:
>> http://public.kitware.com/mailman/listinfo/cmake
>>
>
>
[Attachment #5 (text/html)]
<div dir="ltr">Hello,<div><br></div><div>PRIVATE works, but I don't understand \
why (the only difference between the two examples is using a \
subdirectory).</div><div><br></div><div>Using ${CMAKE_CURRENT_SOURCE_DIR} does not \
work.</div><div><br></div><div>Thanks,</div><div>-- Giovanni</div><div><br></div><div \
class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 9, 2016 at 4:17 PM, \
Chuck Atkins <span dir="ltr"><<a href="mailto:chuck.atkins@kitware.com" \
target="_blank">chuck.atkins@kitware.com</a>></span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr"><div>Hi Giovanni,<br>Does it work if you add \
lib1 as a private dependency of lib2? i.e.:<br><span \
style="font-family:monospace,monospace">target_link_libraries(lib2 PRIVATE \
lib1)</span><br><br>Also, it shouldn't matter but what about in your original \
example if you use the full path to the source file instead while still keeping the \
public link dependency? i.e.:<br><span \
style="font-family:monospace,monospace">add_library(lib1-obj OBJECT \
$(CMAKE_CURRENT_SOURCE_DIR}/li<wbr>b1.cpp).</span><br></div><div \
class="gmail_extra"><br clear="all"><div><div \
class="m_5844174973165701670m_-5799557117749818928gmail_signature" \
data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div \
dir="ltr">----------<br>Chuck Atkins<br>Staff R&D Engineer, Scientific \
Computing<br>Kitware, Inc.<br><br></div></div></div></div></div></div></div><div><div \
class="h5"> <br><div class="gmail_quote">On Fri, Dec 9, 2016 at 5:26 AM, Giovanni \
Funchal <span dir="ltr"><<a href="mailto:gio@cloudnc.co.uk" \
target="_blank">gio@cloudnc.co.uk</a>></span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr">Hi,<div><br></div><div>Apologies, the problem \
wasn't properly minimised because I had some trouble wrapping my head around it. \
Here's two complete examples which I hope can explain the problem better this \
time.</div><div><br></div><div>1) This \
works:</div><div><br></div><div>[CMakeLists.txt]</div><div><div> \
cmake_minimum_required(VERSION 3.6)</div><div> project(Test)</div><div> \
add_library(lib1-obj OBJECT lib1.cpp)<br></div><div> add_library(lib1 \
INTERFACE)<br></div><div> set_target_properties(lib1 PROPERTIES \
INTERFACE_SOURCES $<TARGET_OBJECTS:lib1-obj>)</div><div> add_library(lib2 \
lib2.cpp)<br></div><div> target_link_libraries(lib2 lib1)</div><div> \
add_executable(main main.cpp)<br></div><div> target_link_libraries(main \
lib2)</div></div><div><br></div><div>2) But this does \
not:</div><div><br></div><div><div>[CMakeLists.txt]</div><div></div><div> \
cmake_minimum_required(VERSION 3.6)</div><div> project(Test)</div><div> \
add_library(lib1-obj OBJECT lib1.cpp)<br></div><div> add_library(lib1 \
INTERFACE)<br></div><div> set_target_properties(lib1 PROPERTIES \
INTERFACE_SOURCES $<TARGET_OBJECTS:lib1-obj>)</div><div> add_library(lib2 \
lib2.cpp)<br></div><div> target_link_libraries(lib2 lib1)</div><div> \
add_subdirectory(main)<br></div></div><div><br></div><div>[main/CMakeLists.txt]</div><div><div> \
add_executable(main main.cpp)<br></div><div> target_link_libraries(main \
lib2)</div></div><div><br></div><div>With the second example, I get an error \
"cannot find source file lib1.cpp.o tried \
extensions...".</div><div><br></div><div>Thanks,</div><div>-- \
Giovanni</div><div><div \
class="m_5844174973165701670m_-5799557117749818928h5"><div><br></div><div \
class="gmail_extra"><br><div class="gmail_quote">On Thu, Dec 8, 2016 at 9:56 PM, \
Stephen Kelly <span dir="ltr"><<a href="mailto:steveire@gmail.com" \
target="_blank">steveire@gmail.com</a>></span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid \
rgb(204,204,204);padding-left:1ex"><span \
class="m_5844174973165701670m_-5799557117749818928m_3387639873968406080gmail-">Giovanni \
Funchal wrote:<br> <br>
> Hi,<br>
><br>
> The help page [1] mentions that:<br>
><br>
>> Although object libraries may not be named directly in calls to the<br>
>> target_link_libraries() command, they can be "linked" indirectly by<br>
>> using an Interface Library whose INTERFACE_SOURCES target property<br>
>> is set to name $<TARGET_OBJECTS:objlib>.<br>
><br>
> However, I was unable to get this to work. Doing this:<br>
><br>
> add_library(lib-obj OBJECT test.cpp)<br>
> add_library(lib INTERFACE)<br>
> add_dependencies(lib lib-obj)<br>
> set_target_properties(lib PROPERTIES INTERFACE_SOURCES<br>
> $<TARGET_OBJECTS:lib-obj>)<br>
><br>
> And then trying to specify lib in link_libraries of an executable yields<br>
> an error message "Cannot find source file: ... Tried extensions:... \
".<br> ><br>
> Am I doing something wrong?<br>
<br>
</span>This works for me:<br>
<br>
cmake_minimum_required(VERSION 3.3)<br>
<br>
project(testit CXX)<br>
<br>
add_library(lib-obj OBJECT foo.cpp)<br>
add_library(lib-iface INTERFACE)<br>
set_target_properties(lib-ifac<wbr>e PROPERTIES<br>
<span class="m_5844174973165701670m_-5799557117749818928m_3387639873968406080gmail-"> \
INTERFACE_SOURCES $<TARGET_OBJECTS:lib-obj><br> )<br>
</span> add_executable(main foo-user.cpp)<br>
target_link_libraries(main lib-iface)<br>
<br>
<br>
Thanks,<br>
<br>
Steve.<br>
<br>
<br>
--<br>
<br>
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<br>--<br>
<br>
Powered by <a href="http://www.kitware.com" rel="noreferrer" \
target="_blank">www.kitware.com</a><br> <br>
Please keep messages on-topic and check the CMake FAQ at: <a \
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Kitware offers various services to support the CMake community. For more information \
on each offering, please visit:<br> <br>
CMake Support: <a href="http://cmake.org/cmake/help/support.html" rel="noreferrer" \
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Consulting: <a href="http://cmake.org/cmake/help/consulting.html" rel="noreferrer" \
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Visit other Kitware open-source projects at <a \
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</blockquote></div><br></div></div>
--
Powered by www.kitware.com
Please keep messages on-topic and check the CMake FAQ at: \
http://www.cmake.org/Wiki/CMake_FAQ
Kitware offers various services to support the CMake community. For more information \
on each offering, please visit:
CMake Support: http://cmake.org/cmake/help/support.html
CMake Consulting: http://cmake.org/cmake/help/consulting.html
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Visit other Kitware open-source projects at \
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