Re: [Tarantool-patches] [PATCH v2 luajit 5/7] test: shrink LUA_CPATH and {DY}LD_LIBRARY_PATH

[Sergey Bronnikov via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

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Hi, Sergey,

thanks for the updated patch!

I'm happy to see how much code was removed.

See my comments below.

On 24.09.2024 13:29, Sergey Kaplun wrote:
> This patch sets the unique value of each of these variables for each of
> the tests and only where they are needed. Also, it drops the comment
> about SIP [1] tricks since it is obsolete after
> 29897567ee5ed57e961c730432c056a3dbaa8f09 ("test: stop using
> utils.selfrun in tests").
>
> [1]:https://support.apple.com/en-us/HT204899
>
> Resolves tarantool/tarantool#9898
> ---
>   test/tarantool-tests/CMakeLists.txt           | 85 ++++++++-----------
>   test/tarantool-tests/ffi-ccall/CMakeLists.txt |  2 +-
>   .../fix-bit-shift-generation/CMakeLists.txt   |  3 +-
>   .../gh-4427-ffi-sandwich/CMakeLists.txt       |  3 +-
>   .../CMakeLists.txt                            |  3 +-
>   .../gh-6189-cur_L/CMakeLists.txt              |  3 +-
>   .../lj-1004-oom-error-frame/CMakeLists.txt    |  3 +-
>   .../CMakeLists.txt                            |  3 +-
>   .../lj-1166-error-stitch/CMakeLists.txt       |  6 +-
>   .../lj-416-xor-before-jcc/CMakeLists.txt      |  3 +-
>   .../CMakeLists.txt                            |  3 +-
>   .../lj-549-bytecode-loader/CMakeLists.txt     |  3 +-
>   .../CMakeLists.txt                            |  3 +-
>   .../lj-601-fix-gc-finderrfunc/CMakeLists.txt  |  3 +-
>   .../lj-727-lightuserdata-itern/CMakeLists.txt |  3 +-
>   .../CMakeLists.txt                            |  3 +-
>   .../lj-flush-on-trace/CMakeLists.txt          |  3 +-
>   .../both/CMakeLists.txt                       |  4 +-
>   .../gnuhash/CMakeLists.txt                    |  4 +-
>   .../hash/CMakeLists.txt                       |  4 +-
>   .../stripped/CMakeLists.txt                   |  4 +-
>   21 files changed, 82 insertions(+), 69 deletions(-)
>
> diff --git a/test/tarantool-tests/CMakeLists.txt b/test/tarantool-tests/CMakeLists.txt
> index 5e3493b6..d0964aed 100644
> --- a/test/tarantool-tests/CMakeLists.txt
> +++ b/test/tarantool-tests/CMakeLists.txt
> @@ -5,17 +5,16 @@ add_custom_target(tarantool-tests-libs
>     DEPENDS libluajit
>   )
>   
> -macro(BuildTestCLib lib sources)
> -  AddTestLib(${lib} ${sources})
> +macro(BuildTestCLib lib source for_tests)
> +  AddTestLib(${lib} ${source})
>     add_dependencies(tarantool-tests-libs ${lib})
> -  # Add the directory where the lib is built to the list with
> -  # entries for LUA_CPATH environment variable, so LuaJIT can find
> -  # and load it. See the comment about extending the list in the
> -  # parent scope few lines above.
> -  set(LUA_CPATHS "${CMAKE_CURRENT_BINARY_DIR}/?${CMAKE_SHARED_LIBRARY_SUFFIX};${LUA_CPATHS}" PARENT_SCOPE)
> -  # Also add this directory to LD_LIBRARY_PATH environment
> -  # variable, so FFI machinery can find and load it.
> -  set(LD_LIBRARY_PATH "${CMAKE_CURRENT_BINARY_DIR}:${LD_LIBRARY_PATH}" PARENT_SCOPE)
> +  # Remember libraries for each test to be proceeded with after
> +  # test targets are created.
> +  foreach(testname ${for_tests})
> +    set(LIBS_${testname}
> +      "${CMAKE_CURRENT_BINARY_DIR};${LIBS_${testname}}" PARENT_SCOPE
> +    )
> +  endforeach()
>   endmacro()
>   
>   # FIXME: This is used only due to ancient CMake requirements.
> @@ -81,46 +80,8 @@ make_lua_path(LUA_PATH
>       ${LUAJIT_BINARY_DIR}/?.lua
>   )
>   
> -# Update LUA_CPATH with the library paths collected within
> -# <BuildTestLib> macro.
> -make_lua_path(LUA_CPATH PATHS ${LUA_CPATHS})
> -
>   set(LUA_TEST_SUFFIX .test.lua)
>   
> -# XXX: Since the auxiliary libraries are built as a dynamically
> -# loaded modules on MacOS instead of shared libraries as it is
> -# done on Linux and BSD, another environment variable should be
> -# used to guide <ffi.load> while searching the extension.
> -# XXX: Be noticed that we shouldn't use `"` here to wrap
> -# the variable's content. If we do this, the variable value will
> -# contain `"` at the beginning and the end, so this `"` at the
> -# beginning will be treated as the directory for the first entry
> -# (the last subdirectory added).
> -if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
> -  # XXX: Apple tries their best to "protect their users from
> -  # malware". As a result SIP (see the link[1] below) has been
> -  # designed and released. Now, Apple developers are so protected,
> -  # that they can load nothing being not installed in the system,
> -  # since some programs sanitize the environment before they start
> -  # child processes. Specifically, environment variables starting
> -  # with DYLD_ and LD_ are unset for child process started by
> -  # other programs (like `ctest` using for launching tests).
> -  # For more info, see the docs[2] below.
> -  #
> -  # These environment variables are used by FFI machinery to find
> -  # the proper shared library, hence we can still tweak testing
> -  # environment before calling <ffi.load>. However, the value
> -  # can't be passed via the standard environment variable, so we
> -  # use ENVIRONMENT property in `set_tests_properties` to get
> -  # around SIP magic tricks.
> -  #
> -  # [1]:https://support.apple.com/en-us/HT204899
> -  # [2]:https://developer.apple.com/library/archive/documentation/Security/Conceptual/System_Integrity_Protection_Guide/RuntimeProtections/RuntimeProtections.html
> -  list(APPEND LUA_TEST_ENV_MORE DYLD_LIBRARY_PATH=${LD_LIBRARY_PATH})
> -else()
> -  list(APPEND LUA_TEST_ENV_MORE LD_LIBRARY_PATH=${LD_LIBRARY_PATH})
> -endif()
> -
>   # Some tests use `LD_PRELOAD` to mock system calls (like
>   # <lj-802-panic-at-mcode-protfail.test.lua> overwrites
>   # `mprotect()`. When compiling with ASan support under GCC, it is
> @@ -157,7 +118,7 @@ foreach(test_path ${tests})
>       # LUA_CPATH and LD_LIBRARY_PATH variables and also
>       # dependencies list with libraries are set in scope of
>       # BuildTestLib macro.
> -    ENVIRONMENT "LUA_PATH=${LUA_PATH};LUA_CPATH=${LUA_CPATH};${LUA_TEST_ENV_MORE}"
> +    ENVIRONMENT "LUA_PATH=${LUA_PATH};${LUA_TEST_ENV_MORE}"
>       LABELS ${TEST_SUITE_NAME}
>       DEPENDS tarantool-tests-deps
>     )
> @@ -169,4 +130,30 @@ foreach(test_path ${tests})
>         LUA_PATH "${PROJECT_SOURCE_DIR}/tools/?.lua\;"
>       )
>     endif()
> +
> +  if(LIBS_${test_name})
> +    foreach(path ${LIBS_${test_name}})
> +      # Add the directory where the library is built to the list
> +      # with entries for the LUA_CPATH environment variable, so
> +      # LuaJIT can find and load it.
> +      AppendTestEnvVar(${test_title}
> +        LUA_CPATH "${path}/?${CMAKE_SHARED_LIBRARY_SUFFIX}\;"
> +      )
> +      # Also, add this directory to the LD_LIBRARY_PATH environment
> +      # variable so FFI machinery can find and load it.
> +      # XXX: Be noticed that we shouldn't use `"` here to wrap the
> +      # variable's content. If we do this, the variable value will
> +      # contain `"` at the beginning and the end, so this `"` at the
> +      # beginning will be treated as the directory for the entry.
> +      # XXX: Since the auxiliary libraries are built as dynamically
> +      # loaded modules on MacOS instead of shared libraries as it is
> +      # done on Linux and BSD, another environment variable should
> +      # be used to guide <ffi.load> while searching the extension.
> +      if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
> +        AppendTestEnvVar(${test_title} DYLD_LIBRARY_PATH ${path}:)
> +      else()
> +        AppendTestEnvVar(${test_title} LD_LIBRARY_PATH ${path}:)
> +      endif()
please add unset(LIBS_${test_name})
> +    endforeach()
> +  endif()
>   endforeach()
> diff --git a/test/tarantool-tests/ffi-ccall/CMakeLists.txt b/test/tarantool-tests/ffi-ccall/CMakeLists.txt
> index df937bf8..8acd8fe4 100644
> --- a/test/tarantool-tests/ffi-ccall/CMakeLists.txt
> +++ b/test/tarantool-tests/ffi-ccall/CMakeLists.txt
> @@ -1 +1 @@
> -BuildTestCLib(libfficcall libfficcall.c)
> +BuildTestCLib(libfficcall libfficcall.c ffi-ccall-arm64-fp-convention.test.lua)
> diff --git a/test/tarantool-tests/fix-bit-shift-generation/CMakeLists.txt b/test/tarantool-tests/fix-bit-shift-generation/CMakeLists.txt
> index f85f875b..597b0088 100644
> --- a/test/tarantool-tests/fix-bit-shift-generation/CMakeLists.txt
> +++ b/test/tarantool-tests/fix-bit-shift-generation/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(libtestbitshift libtestbitshift.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(libtestbitshift libtestbitshift.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/gh-4427-ffi-sandwich/CMakeLists.txt b/test/tarantool-tests/gh-4427-ffi-sandwich/CMakeLists.txt
> index f2be5493..7766373d 100644
> --- a/test/tarantool-tests/gh-4427-ffi-sandwich/CMakeLists.txt
> +++ b/test/tarantool-tests/gh-4427-ffi-sandwich/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(libsandwich libsandwich.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(libsandwich libsandwich.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/gh-6098-fix-side-exit-patching-on-arm64/CMakeLists.txt b/test/tarantool-tests/gh-6098-fix-side-exit-patching-on-arm64/CMakeLists.txt
> index 361d0cd7..381577fb 100644
> --- a/test/tarantool-tests/gh-6098-fix-side-exit-patching-on-arm64/CMakeLists.txt
> +++ b/test/tarantool-tests/gh-6098-fix-side-exit-patching-on-arm64/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(libproxy libproxy.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(libproxy libproxy.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/gh-6189-cur_L/CMakeLists.txt b/test/tarantool-tests/gh-6189-cur_L/CMakeLists.txt
> index 1e58e560..11dbfa6b 100644
> --- a/test/tarantool-tests/gh-6189-cur_L/CMakeLists.txt
> +++ b/test/tarantool-tests/gh-6189-cur_L/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(libcur_L libcur_L.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(libcur_L libcur_L.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/lj-1004-oom-error-frame/CMakeLists.txt b/test/tarantool-tests/lj-1004-oom-error-frame/CMakeLists.txt
> index 3bca5df8..865e4d26 100644
> --- a/test/tarantool-tests/lj-1004-oom-error-frame/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-1004-oom-error-frame/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(testoomframe testoomframe.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(testoomframe testoomframe.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/lj-1066-fix-cur_L-after-coroutine-resume/CMakeLists.txt b/test/tarantool-tests/lj-1066-fix-cur_L-after-coroutine-resume/CMakeLists.txt
> index c8a3731f..7b507b81 100644
> --- a/test/tarantool-tests/lj-1066-fix-cur_L-after-coroutine-resume/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-1066-fix-cur_L-after-coroutine-resume/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(libcur_L_coroutine libcur_L_coroutine.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(libcur_L_coroutine libcur_L_coroutine.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/lj-1166-error-stitch/CMakeLists.txt b/test/tarantool-tests/lj-1166-error-stitch/CMakeLists.txt
> index 342e438e..658b3b8c 100644
> --- a/test/tarantool-tests/lj-1166-error-stitch/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-1166-error-stitch/CMakeLists.txt
> @@ -1 +1,5 @@
> -BuildTestCLib(allocinject allocinject.c)
> +list(APPEND tests
> +  lj-1166-error-stitch-oom-ir-buff.test.lua
> +  lj-1166-error-stitch-oom-snap-buff.test.lua
> +)
> +BuildTestCLib(allocinject allocinject.c "${tests}")
> diff --git a/test/tarantool-tests/lj-416-xor-before-jcc/CMakeLists.txt b/test/tarantool-tests/lj-416-xor-before-jcc/CMakeLists.txt
> index 17aa9f9b..e25863a4 100644
> --- a/test/tarantool-tests/lj-416-xor-before-jcc/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-416-xor-before-jcc/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(libtestxor testxor.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(libtestxor testxor.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/lj-522-fix-dlerror-return-null/CMakeLists.txt b/test/tarantool-tests/lj-522-fix-dlerror-return-null/CMakeLists.txt
> index 903da4d3..c4383b37 100644
> --- a/test/tarantool-tests/lj-522-fix-dlerror-return-null/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-522-fix-dlerror-return-null/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(mydlerror mydlerror.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(mydlerror mydlerror.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/lj-549-bytecode-loader/CMakeLists.txt b/test/tarantool-tests/lj-549-bytecode-loader/CMakeLists.txt
> index d66c4935..515de667 100644
> --- a/test/tarantool-tests/lj-549-bytecode-loader/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-549-bytecode-loader/CMakeLists.txt
> @@ -17,5 +17,6 @@ add_custom_target(export_bc
>     VERBATIM
>   )
>   
> -BuildTestCLib(${LIB_NAME} ${C_FILE})
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(${LIB_NAME} ${C_FILE} ${test_name}.test.lua)
>   add_dependencies(${LIB_NAME} export_bc)
> diff --git a/test/tarantool-tests/lj-551-bytecode-c-broken-macro/CMakeLists.txt b/test/tarantool-tests/lj-551-bytecode-c-broken-macro/CMakeLists.txt
> index 1f3e8fe6..89f8583f 100644
> --- a/test/tarantool-tests/lj-551-bytecode-c-broken-macro/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-551-bytecode-c-broken-macro/CMakeLists.txt
> @@ -27,7 +27,8 @@ macro(BuildTestBCLib file_ext)
>       VERBATIM
>     )
>   
> -  BuildTestCLib(${LIB_NAME} ${EXT_SOURCE})
> +  get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +  BuildTestCLib(${LIB_NAME} ${EXT_SOURCE} ${test_name}.test.lua)
>     add_dependencies(${LIB_NAME} export_bc_${file_ext})
>   endmacro()
>   
> diff --git a/test/tarantool-tests/lj-601-fix-gc-finderrfunc/CMakeLists.txt b/test/tarantool-tests/lj-601-fix-gc-finderrfunc/CMakeLists.txt
> index 3fed6105..31c9fa3b 100644
> --- a/test/tarantool-tests/lj-601-fix-gc-finderrfunc/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-601-fix-gc-finderrfunc/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(libmixcframe mixcframe.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(libmixcframe mixcframe.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/lj-727-lightuserdata-itern/CMakeLists.txt b/test/tarantool-tests/lj-727-lightuserdata-itern/CMakeLists.txt
> index 564b688b..1161017d 100644
> --- a/test/tarantool-tests/lj-727-lightuserdata-itern/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-727-lightuserdata-itern/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(lightuserdata lightuserdata.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(lightuserdata lightuserdata.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/lj-802-panic-at-mcode-protfail/CMakeLists.txt b/test/tarantool-tests/lj-802-panic-at-mcode-protfail/CMakeLists.txt
> index 25520a1a..39c7532a 100644
> --- a/test/tarantool-tests/lj-802-panic-at-mcode-protfail/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-802-panic-at-mcode-protfail/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(mymprotect mymprotect.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(mymprotect mymprotect.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/lj-flush-on-trace/CMakeLists.txt b/test/tarantool-tests/lj-flush-on-trace/CMakeLists.txt
> index 16f1aa8f..7dfea075 100644
> --- a/test/tarantool-tests/lj-flush-on-trace/CMakeLists.txt
> +++ b/test/tarantool-tests/lj-flush-on-trace/CMakeLists.txt
> @@ -1 +1,2 @@
> -BuildTestCLib(libflush libflush.c)
> +get_filename_component(test_name ${CMAKE_CURRENT_SOURCE_DIR} NAME)
> +BuildTestCLib(libflush libflush.c ${test_name}.test.lua)
> diff --git a/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/both/CMakeLists.txt b/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/both/CMakeLists.txt
> index ce616fcf..bf980c7d 100644
> --- a/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/both/CMakeLists.txt
> +++ b/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/both/CMakeLists.txt
> @@ -1,5 +1,7 @@
>   if (NOT(CMAKE_SYSTEM_NAME STREQUAL "Darwin"))
> -  BuildTestCLib(resboth resboth.c)
> +  BuildTestCLib(resboth resboth.c
> +    profilers/gh-5813-resolving-of-c-symbols.test.lua
> +  )
>     # Unfortunately, <target_link_options> command is introduced
>     # since CMake 3.13, so we can't use it now considering ancient
>     # distros support. Just build linker flags by hands.
> diff --git a/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/gnuhash/CMakeLists.txt b/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/gnuhash/CMakeLists.txt
> index 1179601b..b80129a3 100644
> --- a/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/gnuhash/CMakeLists.txt
> +++ b/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/gnuhash/CMakeLists.txt
> @@ -1,5 +1,7 @@
>   if (NOT(CMAKE_SYSTEM_NAME STREQUAL "Darwin"))
> -  BuildTestCLib(resgnuhash resgnuhash.c)
> +  BuildTestCLib(resgnuhash resgnuhash.c
> +    profilers/gh-5813-resolving-of-c-symbols.test.lua
> +  )
>     # Unfortunately, <target_link_options> command is introduced
>     # since CMake 3.13, so we can't use it now considering ancient
>     # distros support. Just build linker flags by hands.
> diff --git a/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/hash/CMakeLists.txt b/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/hash/CMakeLists.txt
> index e0ad5675..0633f1f3 100644
> --- a/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/hash/CMakeLists.txt
> +++ b/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/hash/CMakeLists.txt
> @@ -1,5 +1,7 @@
>   if (NOT(CMAKE_SYSTEM_NAME STREQUAL "Darwin"))
> -  BuildTestCLib(reshash reshash.c)
> +  BuildTestCLib(reshash reshash.c
> +    profilers/gh-5813-resolving-of-c-symbols.test.lua
> +  )
>     # Unfortunately, <target_link_options> command is introduced
>     # since CMake 3.13, so we can't use it now considering ancient
>     # distros support. Just build linker flags by hands.
> diff --git a/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/stripped/CMakeLists.txt b/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/stripped/CMakeLists.txt
> index 243902be..2ea0b4ac 100644
> --- a/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/stripped/CMakeLists.txt
> +++ b/test/tarantool-tests/profilers/gh-5813-resolving-of-c-symbols/stripped/CMakeLists.txt
> @@ -1,5 +1,7 @@
>   if (NOT(CMAKE_SYSTEM_NAME STREQUAL "Darwin"))
> -  BuildTestCLib(resstripped resstripped.c)
> +  BuildTestCLib(resstripped resstripped.c
> +    profilers/gh-5813-resolving-of-c-symbols.test.lua
> +  )
>     # Unfortunately, <target_link_options> command is introduced
>     # since CMake 3.13, so we can't use it now considering ancient
>     # distros support. Just build linker flags by hands.

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