File seqan3-unbundle_benchmark.patch of Package seqan3

Author: Michael R. Crusoe <michael.crusoe@gmail.com>
Description: Use the Debian package of libbenchmark
--- seqan3.orig/test/seqan3-test.cmake
+++ seqan3/test/seqan3-test.cmake
@@ -57,7 +57,7 @@
 # seqan3::test::performance specifies required flags, includes and libraries
 # needed for performance test cases in seqan3/test/performance
 add_library (seqan3_test_performance INTERFACE)
-target_link_libraries (seqan3_test_performance INTERFACE "seqan3::test" "gbenchmark")
+target_link_libraries (seqan3_test_performance INTERFACE "seqan3::test" "benchmark")
 
 if (SEQAN3_BENCHMARK_ALIGN_LOOPS)
     target_compile_options (seqan3_test_performance INTERFACE "-falign-loops=32")
--- a/test/cmake/seqan3_require_benchmark.orig.cmake 2021-03-12 15:32:16.217895000 +0100
+++ b/test/cmake/seqan3_require_benchmark.cmake      2021-03-12 15:33:34.694342382 +0100
@@ -5,75 +5,7 @@
 # shipped with this file and also available at: https://github.com/seqan/seqan3/blob/master/LICENSE.md
 # -----------------------------------------------------------------------------------------------------
 
-# Exposes the google-benchmark target `gbenchmark`.
-macro (seqan3_require_benchmark_old gbenchmark_git_tag)
-    set (gbenchmark_project_args ${SEQAN3_EXTERNAL_PROJECT_CMAKE_ARGS})
-    list (APPEND gbenchmark_project_args "-DBENCHMARK_ENABLE_TESTING=false")
-    # google-benchmarks suggest to use LTO (link-time optimisation), but we don't really need that because we are a
-    # header only library. This option might be still interesting for external libraries benchmarks.
-    # see https://github.com/google/benchmark#debug-vs-release
-    # list (APPEND gbenchmark_project_args "-DBENCHMARK_ENABLE_LTO=true")
-
-    # force that libraries are installed to `lib/`, because GNUInstallDirs might install it into `lib64/`
-    list (APPEND gbenchmark_project_args "-DCMAKE_INSTALL_LIBDIR=${PROJECT_BINARY_DIR}/lib/")
-
-    set (gbenchmark_path "${PROJECT_BINARY_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}benchmark${CMAKE_STATIC_LIBRARY_SUFFIX}")
-
-    include (ExternalProject)
-    ExternalProject_Add (
-        gbenchmark_project
-        PREFIX gbenchmark_project
-        GIT_REPOSITORY "https://github.com/google/benchmark.git"
-        GIT_TAG "${gbenchmark_git_tag}"
-        SOURCE_DIR "${SEQAN3_BENCHMARK_CLONE_DIR}"
-        CMAKE_ARGS "${gbenchmark_project_args}"
-        BUILD_BYPRODUCTS "${gbenchmark_path}"
-        UPDATE_DISCONNECTED ${SEQAN3_TEST_BUILD_OFFLINE}
-    )
-    unset (gbenchmark_project_args)
-
-    add_library (gbenchmark STATIC IMPORTED)
-    add_dependencies (gbenchmark gbenchmark_project)
-    set_target_properties (gbenchmark PROPERTIES IMPORTED_LOCATION "${gbenchmark_path}")
-    set_property (TARGET gbenchmark APPEND PROPERTY INTERFACE_LINK_LIBRARIES "pthread")
-
-    # NOTE: google benchmarks needs Shlwapi (Shell Lightweight Utility Functions) on windows
-    # see https://msdn.microsoft.com/en-us/library/windows/desktop/bb759844(v=vs.85).aspx
-    # see https://github.com/google/benchmark/blob/c614dfc0d4eadcd19b188ff9c7e226c138f894a1/README.md#platform-specific-libraries
-    if(${CMAKE_SYSTEM_NAME} MATCHES "Windows")
-        target_link_libraries (gbenchmark INTERFACE "Shlwapi")
-    endif()
-
-    unset (gbenchmark_path)
-endmacro ()
-
 macro (seqan3_require_benchmark)
     enable_testing ()
-
-    set (gbenchmark_git_tag "v1.5.0")
-
-    if (NOT CMAKE_VERSION VERSION_LESS 3.14)
-        # NOTE: setting the standard prevents an ICE involving passing -fconcepts through CMAKE_CXX_FLAGS
-        set (CMAKE_CXX_STANDARD 17)
-        message (STATUS "Fetch google benchmark:")
-
-        include (FetchContent)
-        FetchContent_Declare (
-            gbenchmark_fetch_content
-            GIT_REPOSITORY "https://github.com/google/benchmark.git"
-            GIT_TAG "${gbenchmark_git_tag}"
-        )
-        option (BENCHMARK_ENABLE_TESTING "" OFF)
-        FetchContent_MakeAvailable(gbenchmark_fetch_content)
-
-        # NOTE: google benchmark's CMakeLists.txt already defines Shlwapi
-        add_library (gbenchmark ALIAS benchmark_main)
-        unset (CMAKE_CXX_STANDARD)
-    else ()
-        message (STATUS "Use google benchmark as external project:")
-
-        seqan3_require_benchmark_old ("${gtest_git_tag}")
-    endif ()
-
-    add_custom_target (gbenchmark_build DEPENDS gbenchmark)
+    find_package(benchmark REQUIRED)
 endmacro ()