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cmake: Add layered dependency resolution for offline builds
Add a layered dependency resolution system inspired by abseil-cpp's ABSL_USE_EXTERNAL_GOOGLETEST / ABSL_FIND_GOOGLETEST / ABSL_LOCAL_* pattern. Each dependency now supports three resolution strategies: 1. TCMALLOC_USE_EXTERNAL_<DEP> (ON/OFF): Assume targets already provided by parent project, or use find_package() to locate them. 2. TCMALLOC_LOCAL_<DEP>_DIR (path): Point to a local source checkout which is added via add_subdirectory(). 3. Default: Fall back to FetchContent from GitHub (existing behavior). Dependencies covered: - abseil-cpp: TCMALLOC_USE_EXTERNAL_ABSEIL, TCMALLOC_LOCAL_ABSEIL_DIR - GoogleTest: TCMALLOC_USE_EXTERNAL_GOOGLETEST, TCMALLOC_LOCAL_GOOGLETEST_DIR - Protobuf: TCMALLOC_USE_EXTERNAL_PROTOBUF, TCMALLOC_LOCAL_PROTOBUF_DIR - Benchmark: TCMALLOC_USE_EXTERNAL_BENCHMARK, TCMALLOC_LOCAL_BENCHMARK_DIR - FuzzTest: TCMALLOC_USE_EXTERNAL_FUZZTEST, TCMALLOC_LOCAL_FUZZTEST_DIR This enables fully offline/hermetic builds by pointing all dependencies to pre-fetched local directories or system-installed packages.
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‎CMakeLists.txt‎

Lines changed: 136 additions & 39 deletions
Original file line numberDiff line numberDiff line change
@@ -53,48 +53,145 @@ set(ABSL_FIND_GOOGLETEST OFF CACHE BOOL "" FORCE)
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include(FetchContent)
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# -- abseil-cpp (always required) --
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FetchContent_Declare(
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abseil-cpp
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GIT_REPOSITORY https://github.com/abseil/abseil-cpp.git
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GIT_TAG master
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FIND_PACKAGE_ARGS NAMES absl
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)
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FetchContent_MakeAvailable(abseil-cpp)
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##
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## Dependency resolution options
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##
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## Each dependency supports a layered resolution strategy inspired by
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## abseil-cpp's ABSL_USE_EXTERNAL_GOOGLETEST / ABSL_FIND_GOOGLETEST
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## pattern. For offline or hermetic builds, set the appropriate
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## TCMALLOC_USE_EXTERNAL_* or TCMALLOC_LOCAL_*_DIR options so that
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## no network fetch is required.
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##
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# -- abseil-cpp --
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option(TCMALLOC_USE_EXTERNAL_ABSEIL
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"If ON, assume abseil-cpp targets (absl::*) are already provided by the parent project." OFF)
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set(TCMALLOC_LOCAL_ABSEIL_DIR "" CACHE PATH
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"Path to a local abseil-cpp source directory. Used when TCMALLOC_USE_EXTERNAL_ABSEIL is OFF.")
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if(TCMALLOC_USE_EXTERNAL_ABSEIL)
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if(NOT TARGET absl::base)
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find_package(absl REQUIRED)
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endif()
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else()
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if(TCMALLOC_LOCAL_ABSEIL_DIR)
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add_subdirectory("${TCMALLOC_LOCAL_ABSEIL_DIR}" abseil-cpp EXCLUDE_FROM_ALL)
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else()
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FetchContent_Declare(
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abseil-cpp
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GIT_REPOSITORY https://github.com/abseil/abseil-cpp.git
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GIT_TAG master
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FIND_PACKAGE_ARGS NAMES absl
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)
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FetchContent_MakeAvailable(abseil-cpp)
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endif()
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endif()
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# -- Test-only dependencies --
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if((BUILD_TESTING AND TCMALLOC_BUILD_TESTING) OR TCMALLOC_BUILD_TEST_HELPERS)
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FetchContent_Declare(
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googletest
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GIT_REPOSITORY https://github.com/google/googletest.git
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GIT_TAG main
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FIND_PACKAGE_ARGS NAMES GTest
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)
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FetchContent_MakeAvailable(googletest)
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FetchContent_Declare(
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protobuf
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GIT_REPOSITORY https://github.com/protocolbuffers/protobuf.git
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GIT_TAG main
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FIND_PACKAGE_ARGS NAMES Protobuf
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)
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FetchContent_MakeAvailable(protobuf)
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FetchContent_Declare(
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benchmark
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GIT_REPOSITORY https://github.com/google/benchmark.git
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GIT_TAG main
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FIND_PACKAGE_ARGS NAMES benchmark
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)
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FetchContent_MakeAvailable(benchmark)
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FetchContent_Declare(
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fuzztest
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GIT_REPOSITORY https://github.com/google/fuzztest.git
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GIT_TAG main
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FIND_PACKAGE_ARGS NAMES fuzztest
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)
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FetchContent_MakeAvailable(fuzztest)
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# GoogleTest
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option(TCMALLOC_USE_EXTERNAL_GOOGLETEST
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"If ON, assume GoogleTest targets (GTest::*) are already provided." OFF)
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set(TCMALLOC_LOCAL_GOOGLETEST_DIR "" CACHE PATH
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"Path to a local GoogleTest source directory.")
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if(TCMALLOC_USE_EXTERNAL_GOOGLETEST)
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if(NOT TARGET GTest::gtest)
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find_package(GTest REQUIRED)
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endif()
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else()
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if(TCMALLOC_LOCAL_GOOGLETEST_DIR)
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add_subdirectory("${TCMALLOC_LOCAL_GOOGLETEST_DIR}" googletest EXCLUDE_FROM_ALL)
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if(TARGET gtest AND NOT TARGET GTest::gtest)
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add_library(GTest::gtest ALIAS gtest)
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add_library(GTest::gtest_main ALIAS gtest_main)
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add_library(GTest::gmock ALIAS gmock)
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add_library(GTest::gmock_main ALIAS gmock_main)
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endif()
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else()
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FetchContent_Declare(
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googletest
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GIT_REPOSITORY https://github.com/google/googletest.git
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GIT_TAG main
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FIND_PACKAGE_ARGS NAMES GTest
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)
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FetchContent_MakeAvailable(googletest)
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endif()
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endif()
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# Protobuf
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option(TCMALLOC_USE_EXTERNAL_PROTOBUF
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"If ON, assume Protobuf targets are already provided." OFF)
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set(TCMALLOC_LOCAL_PROTOBUF_DIR "" CACHE PATH
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"Path to a local protobuf source directory.")
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if(TCMALLOC_USE_EXTERNAL_PROTOBUF)
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if(NOT TARGET protobuf::libprotobuf)
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find_package(Protobuf REQUIRED)
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endif()
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else()
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if(TCMALLOC_LOCAL_PROTOBUF_DIR)
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add_subdirectory("${TCMALLOC_LOCAL_PROTOBUF_DIR}" protobuf EXCLUDE_FROM_ALL)
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else()
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FetchContent_Declare(
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protobuf
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GIT_REPOSITORY https://github.com/protocolbuffers/protobuf.git
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GIT_TAG main
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FIND_PACKAGE_ARGS NAMES Protobuf
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)
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FetchContent_MakeAvailable(protobuf)
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endif()
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endif()
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# Google Benchmark
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option(TCMALLOC_USE_EXTERNAL_BENCHMARK
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"If ON, assume Google Benchmark targets are already provided." OFF)
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set(TCMALLOC_LOCAL_BENCHMARK_DIR "" CACHE PATH
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"Path to a local Google Benchmark source directory.")
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if(TCMALLOC_USE_EXTERNAL_BENCHMARK)
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if(NOT TARGET benchmark::benchmark)
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find_package(benchmark REQUIRED)
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endif()
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else()
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if(TCMALLOC_LOCAL_BENCHMARK_DIR)
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add_subdirectory("${TCMALLOC_LOCAL_BENCHMARK_DIR}" benchmark EXCLUDE_FROM_ALL)
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else()
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FetchContent_Declare(
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benchmark
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GIT_REPOSITORY https://github.com/google/benchmark.git
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GIT_TAG main
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FIND_PACKAGE_ARGS NAMES benchmark
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)
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FetchContent_MakeAvailable(benchmark)
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endif()
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endif()
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# FuzzTest
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option(TCMALLOC_USE_EXTERNAL_FUZZTEST
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"If ON, assume FuzzTest targets are already provided." OFF)
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set(TCMALLOC_LOCAL_FUZZTEST_DIR "" CACHE PATH
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"Path to a local FuzzTest source directory.")
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if(TCMALLOC_USE_EXTERNAL_FUZZTEST)
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if(NOT TARGET fuzztest::fuzztest)
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find_package(fuzztest REQUIRED)
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endif()
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else()
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if(TCMALLOC_LOCAL_FUZZTEST_DIR)
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add_subdirectory("${TCMALLOC_LOCAL_FUZZTEST_DIR}" fuzztest EXCLUDE_FROM_ALL)
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else()
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FetchContent_Declare(
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fuzztest
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GIT_REPOSITORY https://github.com/google/fuzztest.git
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GIT_TAG main
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FIND_PACKAGE_ARGS NAMES fuzztest
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)
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FetchContent_MakeAvailable(fuzztest)
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endif()
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endif()
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endif()
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list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/CMake)

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