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CMakeLists.txt
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# ~~~
# Copyright 2017 Google Inc.
#
# 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.
# ~~~
cmake_minimum_required(VERSION 3.5)
# Define the project name and where to report bugs.
set(PACKAGE_BUGREPORT
"https://github.com/GoogleCloudPlatform/google-cloud-cpp/issues")
project(google-cloud-cpp CXX C)
# Configure the Compiler options, we will be using C++11 features.
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
# gcc-4.8 C++11 support has bugs preventing us from using it.
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
message(
FATAL_ERROR
"GCC version must be at least 4.9. Older versions"
" either lack C++11 support or have bugs"
" (e.g. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55817)"
" that prevent us from using them.")
endif ()
elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
# Before Clang-3.8 we ran into bugs with std::async() and exceptions.
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.8)
message(
FATAL_ERROR
"Clang version must be at least 3.8. Older versions"
" either lack C++11 support or have bugs that prevent us from"
" using them.")
endif ()
endif ()
option(GOOGLE_CLOUD_CPP_ENABLE_MACOS_OPENSSL_CHECK
"If enabled, check that the user has defined OPENSSL_ROOT_DIR on macOS"
ON)
if (APPLE)
# This is an easy mistake to make, and the error messages are very
# confusing. Help our users by giving them some guidance.
if ("${GOOGLE_CLOUD_CPP_ENABLE_MACOS_OPENSSL_CHECK}"
AND
NOT DEFINED ENV{OPENSSL_ROOT_DIR})
message(FATAL_ERROR [===[
The Google Cloud C++ client libraries use the native OpenSSL library. In most
macOS systems, you need to set the OPENSSL_ROOT_DIR environment variable to find
this dependency, for example:
export OPENSSL_ROOT_DIR=/usr/local/opt/libressl
You have not set this environment variable. Most likely, this will result in a
broken build with fairly obscure error messages. If your environment does not
require setting OPENSSL_ROOT_DIR, you can disable this check using:
cmake -DGOOGLE_CLOUD_CPP_ENABLE_MACOS_OPENSSL_CHECK=OFF ...
]===])
endif ()
endif (APPLE)
# If ccache is installed use it for the build. This makes the Travis
# configuration agnostic as to wether ccache is installed or not.
option(
GOOGLE_CLOUD_CPP_ENABLE_CCACHE "Automatically use ccache if available" ON)
if ("${GOOGLE_CLOUD_CPP_ENABLE_CCACHE}")
find_program(CCACHE_FOUND ccache NAMES /usr/bin/ccache)
if (CCACHE_FOUND)
message(STATUS "ccache found: ${CCACHE_FOUND}")
set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_FOUND}")
set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK "${CCACHE_FOUND}")
set(GOOGLE_CLOUD_CPP_EXTERNAL_PROJECT_CCACHE
"-DCMAKE_CXX_COMPILER_LAUNCHER=${CCACHE_FOUND}"
"-DCMAKE_CC_COMPILER_LAUNCHER=${CCACHE_FOUND}")
endif ()
endif ()
# The default source for dependencies.
set(GOOGLE_CLOUD_CPP_DEPENDENCY_PROVIDER "external" CACHE STRING "[===[
How to find the dependencies for google-cloud-cpp.
The Google Cloud C++ client libraries have several external dependencies,
notably gRPC, libcurl, OpenSSL, and a few others.
This configuration option controls how are these dependencies are found. It can
be set to:
* external: use CMake's `ExternalProject` to download and compile the
dependencies. This is the recommended configuration for development, as it
isolates your build from the system configuration.
* package: use CMake's `find_package()` to find the dependencies. This is the
recommended configuration for compiling and installing google-cloud-cpp.
* vcpkg: use github.com/Microsoft/vcpkg to find the dependencies. vcpkg
largely behaves as `package`, but we have a few bugs in our CMake
configuration that need to be cleaned up. This option will be changed to
behave exactly as `package` once we fix these problems.
* pkg-config: use pkg-config(1) to find the dependencies. Sometimes the
dependencies are installed in the system, but the CMake configuration files
to support them are not. WARNING: this option may be removed in the future,
we think that modern CMake features like `ExternalProject` and `find_package`
are better options for dependency management.
To experiment with different configurations developers can override the setting
for one or more dependencies. For example, you could set
`GOOGLE_CLOUD_CPP_DEPENDENCY_PROVIDER` to `package` and
`GOOGLE_CLOUD_CPP_GMOCK_PROVIDER` to `external`. These overrides are intended
for development and testing of new dependencies and are not recommended for
production use.
]===]")
set_property(CACHE GOOGLE_CLOUD_CPP_DEPENDENCY_PROVIDER
PROPERTY STRINGS
"external"
"package"
"vcpkg"
"pkg-config")
set(PROJECT_THIRD_PARTY_DIR "${PROJECT_SOURCE_DIR}/third_party")
list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
# Add gRPC and protobuf targets as submodules or packages, depending on the
# configuration. This should happen before enable_testing(), because we are not
# interested in compiling and running the gRPC tests.
include(IncludeGrpc)
# Enable testing in this directory so we can do a top-level `make test`. This
# also includes the BUILD_TESTING option, which is on by default.
include(CTest)
# Each subproject adds dependencies to this target to have their docs generated.
add_custom_target(doxygen-docs)
# There are a number of targets we cannot, or do not care to compile with the
# static analyzer enabled. Either because the build times are too long, or
# because the code is an external dependency, or generated code, or all of
# above. These targets are added as dependencies of `skip-scanbuild-targets` and
# compiled with, obviously, scan-build disabled.
add_custom_target(skip-scanbuild-targets)
# Add subprojects here.
add_subdirectory(google/cloud)