OpenCensusDeps.cmake

# Copyright 2018, OpenCensus Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

include(FetchContent)

find_package(googletest)
if(NOT googletest_FOUND)
  FetchContent_Declare(
    googletest
    GIT_REPOSITORY https://github.com/google/googletest
    GIT_TAG master)

  FetchContent_GetProperties(googletest)
  if(BUILD_TESTING)
    message(STATUS "Dependency: googletest (BUILD_TESTING=${BUILD_TESTING})")
    if(NOT googletest_POPULATED)
      if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
        # All the libraries in the build must use either /MD or /MT (runtime
        # library to link)
        #
        # force this option to ON so that Google Test will use /MD instead of
        # /MT /MD is now the default for Visual Studio, so it should be our
        # default, too
        option(
          gtest_force_shared_crt
          "Use shared (DLL) run-time lib even when Google Test is built as static lib."
          ON)
      endif()

      FetchContent_Populate(googletest)
      add_subdirectory(${googletest_SOURCE_DIR} ${googletest_BINARY_DIR}
                       EXCLUDE_FROM_ALL)
    endif()
  endif()
endif()

# the right thing to do would be to _always_ build abseil as a static library
# with -fPIC in case BUILD_SHARED_LIBS is on. it is problematic with the way I
# currently build googleapis cpp files within google-cloud-cpp
#
# the crux of the matter is that I need to link opencensus-cpp shared libs into
# applications that already have their own libcurl, libgrpc* ...

find_package(absl)
if(NOT absl_FOUND)
  FetchContent_Declare(
    abseil
    GIT_REPOSITORY https://github.com/abseil/abseil-cpp
    GIT_TAG master)

  FetchContent_GetProperties(abseil)
  if(NOT abseil_POPULATED)
    message(STATUS "Dependency: abseil")
    set(orig_BUILD_TESTING "${BUILD_TESTING}")
    set(BUILD_TESTING OFF) # Don't include abseil tests.
    FetchContent_Populate(abseil)
    add_subdirectory(${abseil_SOURCE_DIR} ${abseil_BINARY_DIR} EXCLUDE_FROM_ALL)
    set(BUILD_TESTING "${orig_BUILD_TESTING}") # Restore value.
  endif()
endif()

FetchContent_Declare(
  prometheus
  GIT_REPOSITORY https://github.com/jupp0r/prometheus-cpp
  GIT_TAG master)

FetchContent_GetProperties(prometheus)
if(NOT prometheus_POPULATED)
  message(STATUS "Dependency: prometheus")
  set(ENABLE_PUSH
      OFF
      CACHE BOOL "Build prometheus-cpp push library" FORCE)
  set(ENABLE_PULL
      OFF
      CACHE BOOL "Build prometheus-cpp pull library" FORCE)
  set(ENABLE_COMPRESSION
      OFF
      CACHE BOOL "Enable gzip compression for prometheus-cpp" FORCE)
  set(ENABLE_TESTING
      OFF
      CACHE BOOL "Build test for prometheus-cpp" FORCE)
  FetchContent_Populate(prometheus)
  add_subdirectory(${prometheus_SOURCE_DIR} ${prometheus_BINARY_DIR}
                   EXCLUDE_FROM_ALL)
endif()

find_package(benchmark)
if(NOT benchmark_FOUND)
  FetchContent_Declare(
    benchmark
    GIT_REPOSITORY https://github.com/google/benchmark
    GIT_TAG master)
  FetchContent_GetProperties(benchmark)
  if(BUILD_TESTING)
    message(STATUS "Dependency: benchmark (BUILD_TESTING=${BUILD_TESTING})")
    if(NOT benchmark_POPULATED)
      set(BENCHMARK_ENABLE_TESTING
          OFF
          CACHE BOOL "Enable testing of the benchmark library." FORCE)
      set(BENCHMARK_ENABLE_GTEST_TESTS
          OFF
          CACHE BOOL "Enable building the unit tests which depend on gtest"
                FORCE)
      FetchContent_Populate(benchmark)
      add_subdirectory(${benchmark_SOURCE_DIR} ${benchmark_BINARY_DIR}
                       EXCLUDE_FROM_ALL)
    endif()
  endif()
endif()