From f6a79db4d2c0a8bc1dbe1cefe31c25255b20bb20 Mon Sep 17 00:00:00 2001
From: topazus <topazus@outlook.com>
Date: Mon, 18 Dec 2023 14:26:43 +0800
Subject: [PATCH] Add ROARING_USE_CPM option in CMake

---
 CMakeLists.txt                 |  6 +++++-
 microbenchmarks/CMakeLists.txt | 28 ++++++++++++++++------------
 tools/cmake/FindCTargets.cmake | 24 ++++++++++++++++++------
 3 files changed, 39 insertions(+), 19 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9218de391..baea6d5c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,7 +52,11 @@ endif()
 
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/tools/cmake")
 
-include(cmake/CPM.cmake)
+option(ROARING_USE_CPM "Use CPM to fetch dependencies" ON)
+
+if(ROARING_USE_CPM)
+  include(cmake/CPM.cmake)
+endif()
 find_package(CTargets)
 find_package(Options)
 find_package(LTO)
diff --git a/microbenchmarks/CMakeLists.txt b/microbenchmarks/CMakeLists.txt
index 4a7288e70..04ba24c7a 100644
--- a/microbenchmarks/CMakeLists.txt
+++ b/microbenchmarks/CMakeLists.txt
@@ -3,19 +3,23 @@ set (BENCHMARK_DATA_DIR "${PROJECT_SOURCE_DIR}/benchmarks/realdata/")
 
 include(${PROJECT_SOURCE_DIR}/tools/cmake/Import.cmake)
 
-set_off(BENCHMARK_ENABLE_TESTING)
-set_off(BENCHMARK_ENABLE_INSTALL)
-set_off(BENCHMARK_ENABLE_WERROR)
-set(BENCHMARK_ENABLE_WERROR OFF)
- CPMAddPackage(
-     NAME benchmark
-     GITHUB_REPOSITORY google/benchmark
-     GIT_TAG 3441176
-     OPTIONS "BENCHMARK_ENABLE_TESTING OFF"
-             "BENCHMARK_ENABLE_INSTALL OFF"
-             "BENCHMARK_ENABLE_WERROR OFF"
+if(ROARING_USE_CPM)
+    set_off(BENCHMARK_ENABLE_TESTING)
+    set_off(BENCHMARK_ENABLE_INSTALL)
+    set_off(BENCHMARK_ENABLE_WERROR)
+    set(BENCHMARK_ENABLE_WERROR OFF)
+    CPMAddPackage(
+        NAME benchmark
+        GITHUB_REPOSITORY google/benchmark
+        GIT_TAG 3441176
+        OPTIONS "BENCHMARK_ENABLE_TESTING OFF"
+                "BENCHMARK_ENABLE_INSTALL OFF"
+                "BENCHMARK_ENABLE_WERROR OFF"
 
-   )
+    )
+else()
+    find_package(benchmark REQUIRED)
+endif()
 
 add_executable(bench bench.cpp)
 target_link_libraries(bench PRIVATE roaring)
diff --git a/tools/cmake/FindCTargets.cmake b/tools/cmake/FindCTargets.cmake
index 8eb227e6c..243cc848a 100644
--- a/tools/cmake/FindCTargets.cmake
+++ b/tools/cmake/FindCTargets.cmake
@@ -4,11 +4,15 @@ endif ()
 include(${PROJECT_SOURCE_DIR}/tools/cmake/Import.cmake)
 set(BUILD_STATIC_LIB ON)
 if (ENABLE_ROARING_TESTS)
-  CPMAddPackage(
-       NAME cmocka
-       GITHUB_REPOSITORY clibs/cmocka
-       GIT_TAG f5e2cd7
+  if(ROARING_USE_CPM)
+    CPMAddPackage(
+      NAME cmocka
+      GITHUB_REPOSITORY clibs/cmocka
+      GIT_TAG f5e2cd7
     )
+  else()
+    find_package(cmocka REQUIRED)
+  endif()
 endif()
 
 function(add_c_test TEST_NAME)
@@ -18,7 +22,11 @@ function(add_c_test TEST_NAME)
 
   add_executable(${TEST_NAME} ${TEST_NAME}.c)
 
-  target_link_libraries(${TEST_NAME} roaring cmocka-static)
+  if(ROARING_USE_CPM)
+    target_link_libraries(${TEST_NAME} roaring cmocka-static)
+  else()
+    target_link_libraries(${TEST_NAME} roaring cmocka)
+  endif()
 
   add_test(${TEST_NAME} ${TEST_NAME})
 endfunction(add_c_test)
@@ -35,7 +43,11 @@ if (CMAKE_VERSION VERSION_GREATER 2.8.10)
     get_directory_property(parent_dir PARENT_DIRECTORY)
     target_include_directories(${TEST_NAME} PRIVATE "${parent_dir}/cpp")
 
-    target_link_libraries(${TEST_NAME} roaring cmocka-static)
+    if(ROARING_USE_CPM)
+      target_link_libraries(${TEST_NAME} roaring cmocka-static)
+    else()
+      target_link_libraries(${TEST_NAME} roaring cmocka)
+    endif()
 
     add_test(${TEST_NAME} ${TEST_NAME})
   endfunction(add_cpp_test)