raulcd commented on code in PR #45618:
URL: https://github.com/apache/arrow/pull/45618#discussion_r2053612804
##########
cpp/src/arrow/compute/CMakeLists.txt:
##########
@@ -81,11 +86,36 @@ function(ADD_ARROW_COMPUTE_TEST REL_TEST_NAME)
set(LABELS ${ARROW_COMPUTE_TEST_LABELS})
endif()
+ if(WIN32)
+ if(MSVC)
+ set(EXTRA_LINK_LIBS arrow_compute_shared)
+ set(EXTRA_LINK_OPTIONS "/WHOLEARCHIVE:arrow_compute_shared")
+ else()
+ set(EXTRA_LINK_LIBS "-Wl,--whole-archive" arrow_compute_shared
+ "-Wl,--allow-multiple-definition"
"-Wl,--no-whole-archive")
+ endif()
+ elseif(APPLE)
+ set(EXTRA_LINK_LIBS "-Wl,-force_load" arrow_compute_shared)
+ else()
+ set(EXTRA_LINK_LIBS "-Wl,--push-state,--no-as-needed" arrow_compute_shared
+ "-Wl,--pop-state")
+ endif()
+
+ if(ARG_EXTRA_LINK_LIBS)
+ list(APPEND EXTRA_LINK_LIBS ${ARG_EXTRA_LINK_LIBS})
+ endif()
Review Comment:
I haven't been able to make this work for `WIN32` yet, I'll keep
investigating how to force the linker to not optimize out
`arrow_compute_shared` and force adding it on `WIN32`. I am unsure this is what
we want to do. From what I understand the linker is allowed to skip libraries
not used by the end result and as `libarrow_compute_shared` is never used its
optimized out, that's why we have to use the `--no-as-needed` / `-force-load` /
`while-archive` flags. From my understanding, having the static initializer
there and never calling anything explicitly on `libarrow_compute` will make
anyone that tries to use Compute and link against Arrow to require those flags
to be set making the use of `arrow_compute` quite cumbersome.
At this point I think the explicit function call to `RegisterComputeKernels`
is a better approach as it's much simpler from a user stand-point.
@kou @pitrou any thoughts on this?
I am trying to investigate as this is new for me :) and I haven't found much
info about those flags or how to use them on the different platforms. A couple
of links issues around those (not super relevant):
https://discourse.cmake.org/t/add-linker-archive-options-before-and-after-a-target/2373
https://github.com/PixarAnimationStudios/OpenUSD/pull/2284/files
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