deps(abseil-cpp): remove dependence on abseil-cpp

.clang-tidy

@@ -2,7 +2,6 @@
 # NOTE: there must be no spaces before the '-', so put the comma last.
 InheritParentConfig: true
 Checks: '
-abseil-*,
 bugprone-*,
 -bugprone-easily-swappable-parameters,
 clang-analyzer-*,

CMakeLists.txt

@@ -22,15 +22,9 @@ set(THIRD_PARTY_DIR "${CMAKE_SOURCE_DIR}/third-party")
 if(NOT DEFINED PYBIND11_VERSION AND NOT "$ENV{PYBIND11_VERSION}" STREQUAL "")
     set(PYBIND11_VERSION "$ENV{PYBIND11_VERSION}")
 endif()
-if(NOT DEFINED ABSEIL_CPP_VERSION AND NOT "$ENV{ABSEIL_CPP_VERSION}" STREQUAL "")
-    set(ABSEIL_CPP_VERSION "$ENV{ABSEIL_CPP_VERSION}")
-endif()
 if(NOT PYBIND11_VERSION)
     set(PYBIND11_VERSION v2.11.1)
 endif()
-if(NOT ABSEIL_CPP_VERSION)
-    set(ABSEIL_CPP_VERSION 20230802.1)
-endif()
 
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Release)
@@ -189,24 +183,5 @@ else()
     find_package(pybind11 CONFIG PATHS "${PYBIND11_CMAKE_DIR}")
 endif()
 
-# Include abseil-cpp
-set(ABSL_PROPAGATE_CXX_STD ON)
-set(ABSL_BUILD_TESTING OFF)
-FetchContent_Declare(
-    abseilcpp
-    GIT_REPOSITORY /~https://github.com/abseil/abseil-cpp.git
-    GIT_TAG "${ABSEIL_CPP_VERSION}"
-    GIT_SHALLOW TRUE
-    SOURCE_DIR "${THIRD_PARTY_DIR}/abseil-cpp"
-    BINARY_DIR "${THIRD_PARTY_DIR}/.cmake/abseil-cpp/build"
-    STAMP_DIR "${THIRD_PARTY_DIR}/.cmake/abseil-cpp/stamp"
-)
-FetchContent_GetProperties(abseilcpp)
-
-if(NOT abseilcpp_POPULATED)
-    message(STATUS "Populating Git repository abseil-cpp@${ABSEIL_CPP_VERSION} to third-party/abseil-cpp...")
-    FetchContent_MakeAvailable(abseilcpp)
-endif()
-
 include_directories("${CMAKE_SOURCE_DIR}")
 add_subdirectory(src)