PR #1546: CMake: Enable CMP0074 so that GTest_ROOT can be specified Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1546 I am building Abseil with tests enabled and an external GTest build, i.e. ``` -DABSL_BUILD_TESTING=ON -DABSL_USE_EXTERNAL_GOOGLETEST=ON -DABSL_FIND_GOOGLETEST=ON -DGTest_ROOT=/path/to/googletest/1.14.0 ``` However, CMake (3.20.2) configuration yielded this result: ``` -- Looking for pthread_create in pthreads - not found -- Looking for pthread_create in pthread -- Looking for pthread_create in pthread - found -- Found Threads: TRUE CMake Warning (dev) at CMakeLists.txt:150 (find_package): Policy CMP0074 is not set: find_package uses <PackageName>_ROOT variables. Run "cmake --help-policy CMP0074" for policy details. Use the cmake_policy command to set the policy and suppress this warning. CMake variable GTest_ROOT is set to: /path/to/googletest/1.14.0 For compatibility, CMake is ignoring the variable. This warning is for project developers. Use -Wno-dev to suppress it. CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:230 (message): Could NOT find GTest (missing: GTEST_LIBRARY GTEST_INCLUDE_DIR GTEST_MAIN_LIBRARY) Call Stack (most recent call first): /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:594 (_FPHSA_FAILURE_MESSAGE) /usr/share/cmake/Modules/FindGTest.cmake:255 (FIND_PACKAGE_HANDLE_STANDARD_ARGS) CMakeLists.txt:150 (find_package) -- Configuring incomplete, errors occurred! See also "/tmp/abseil-build/CMakeFiles/CMakeOutput.log". See also "/tmp/abseil-build/CMakeFiles/CMakeError.log". ``` This PR sets `CMP0074=NEW` so that the GTest install location can be specified via `GTest_ROOT`. Merge 4e4f035affd9b8af739634afdf9c2e80d14c2391 into 2a18ba753bca64e79f6d9857a9f64e638b32c371 Merging this change closes #1546 COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1546 from iskunk:feature/fix-gtest-root 4e4f035affd9b8af739634afdf9c2e80d14c2391 PiperOrigin-RevId: 574159856 Change-Id: Ifc796500c3a6403d28a027375116437bc743205a
The repository contains the Abseil C++ library code. Abseil is an open-source collection of C++ code (compliant to C++14) designed to augment the C++ standard library.
Abseil is an open-source collection of C++ library code designed to augment the C++ standard library. The Abseil library code is collected from Google's own C++ code base, has been extensively tested and used in production, and is the same code we depend on in our daily coding lives.
In some cases, Abseil provides pieces missing from the C++ standard; in others, Abseil provides alternatives to the standard for special needs we've found through usage in the Google code base. We denote those cases clearly within the library code we provide you.
Abseil is not meant to be a competitor to the standard library; we've just found that many of these utilities serve a purpose within our code base, and we now want to provide those resources to the C++ community as a whole.
If you want to just get started, make sure you at least run through the Abseil Quickstart. The Quickstart contains information about setting up your development environment, downloading the Abseil code, running tests, and getting a simple binary working.
Bazel and CMake are the official build systems for Abseil. See the quickstart for more information on building Abseil using the Bazel build system. If you require CMake support, please check the CMake build instructions and CMake Quickstart.
Abseil follows Google's Foundational C++ Support Policy. See this table for a list of currently supported versions compilers, platforms, and build tools.
Abseil contains the following C++ library components:
base base library contains initialization code and other code which all other Abseil code depends on. Code within base may not depend on any other code (other than the C++ standard library).algorithm algorithm library contains additions to the C++ <algorithm> library and container-based versions of such algorithms.cleanup cleanup library contains the control-flow-construct-like type absl::Cleanup which is used for executing a callback on scope exit.container container library contains additional STL-style containers, including Abseil's unordered “Swiss table” containers.crc The crc library contains code for computing error-detecting cyclic redundancy checks on data.debugging debugging library contains code useful for enabling leak checks, and stacktrace and symbolization utilities.flags flags library contains code for handling command line flags for libraries and binaries built with Abseil.hash hash library contains the hashing framework and default hash functor implementations for hashable types in Abseil.log log library contains LOG and CHECK macros and facilities for writing logged messages out to disk, stderr, or user-extensible destinations.memory memory library contains memory management facilities that augment C++'s <memory> library.meta meta library contains compatible versions of type checks available within C++14 and C++17 versions of the C++ <type_traits> library.numeric numeric library contains 128-bit integer types as well as implementations of C++20's bitwise math functions.profiling profiling library contains utility code for profiling C++ entities. It is currently a private dependency of other Abseil libraries.random random library contains functions for generating psuedorandom values.status status library contains abstractions for error handling, specifically absl::Status and absl::StatusOr<T>.strings strings library contains a variety of strings routines and utilities, including a C++14-compatible version of the C++17 std::string_view type.synchronization synchronization library contains concurrency primitives (Abseil's absl::Mutex class, an alternative to std::mutex) and a variety of synchronization abstractions.time time library contains abstractions for computing with absolute points in time, durations of time, and formatting and parsing time within time zones.types types library contains non-container utility types, like a C++14-compatible version of the C++17 std::optional type.utility utility library contains utility and helper code.Abseil recommends users “live-at-head” (update to the latest commit from the master branch as often as possible). However, we realize this philosophy doesn't work for every project, so we also provide Long Term Support Releases to which we backport fixes for severe bugs. See our release management document for more details.
The Abseil C++ library is licensed under the terms of the Apache license. See LICENSE for more information.
For more information about Abseil: