[CMake] Trouble with CMAKE_EXE_LINKER_FLAGS not honored

[Tom Finegan]

On Wed, Jun 5, 2019 at 9:29 AM Bryan Christ <bryan.christ at gmail.com> wrote:

> Tom,
>
> I'll give that a try.  Can that variable be changed after project() is
> called?
>

Yes, you should be able to change it at any point in your CMake script(s).

Remember that CMAKE_<linker type>_LINKER_FLAGS will effect all targets.
Restricting your settings changes to the targets for which they are
intended is usually better than touching variables like
CMAKE_SHARED_LINKER_FLAGS.  You may have better results using
target_link_libraries() to set your flags.


>
> On Tue, Jun 4, 2019 at 5:24 PM Tom Finegan <tomfinegan at google.com> wrote:
>
>> I think you want CMAKE_SHARED_LINKER_FLAGS:
>>
>>
>> https://cmake.org/cmake/help/latest/variable/CMAKE_SHARED_LINKER_FLAGS.html
>>
>> You can also use target_link_libraries to pass linker flags:
>>
>> https://cmake.org/cmake/help/latest/command/target_link_libraries.html
>>
>> On Tue, Jun 4, 2019 at 1:12 PM Bryan Christ <bryan.christ at gmail.com>
>> wrote:
>>
>>> For building my project on Linux with gcc I set the following.
>>>
>>> set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}
>>> -Wl,--no-as-needed")
>>>
>>> Later, if, the system appears to be OSX, I change it:
>>>
>>> if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
>>>
>>>     set(CMAKE_EXE_LINKER_FLAGS "-Wl,-undefined -Wl,dynamic_lookup")
>>>     set(CMAKE_PREFIX_PATH /usr/local/opt/ncurses)
>>>
>>> endif()
>>>
>>> However, when creating the shared object, linking fails.  The flags are
>>> not being passed to clang as expected.  When I dive into
>>> CMakeFile/vterm-shared.dir/link.txt I confirm that the wrong flags are
>>> there.
>>>
>>> What am I doing wrong?
>>>
>>> --
>>> Bryan
>>> <><
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>
> --
> Bryan
> <><
>
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