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CMakeLists.txt
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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/googleapis/google-cloud-cpp-common/issues")
project(google-cloud-cpp-common CXX C)
# Configure the Compiler options, we use C++11 features by default.
set(GOOGLE_CLOUD_CPP_CXX_STANDARD
11
CACHE STRING "Configure CMAKE_CXX_STANDARD")
mark_as_advanced(GOOGLE_CLOUD_CPP_CXX_STANDARD)
set(CMAKE_CXX_STANDARD "${GOOGLE_CLOUD_CPP_CXX_STANDARD}")
set(CMAKE_CXX_STANDARD_REQUIRED ON)
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
# gcc-4.8 is the first release that claims C++11 support.
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
message(
FATAL_ERROR
"GCC version must be at least 4.8. Older versions"
" either lack C++11 support or have bugs 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)
mark_as_advanced(GOOGLE_CLOUD_CPP_ENABLE_CCACHE)
if ("${GOOGLE_CLOUD_CPP_ENABLE_CCACHE}")
find_program(GOOGLE_CLOUD_CPP_CCACHE_PROGRAM ccache NAMES /usr/bin/ccache)
mark_as_advanced(GOOGLE_CLOUD_CPP_CCACHE_PROGRAM)
if (GOOGLE_CLOUD_CPP_CCACHE_PROGRAM)
message(STATUS "ccache found: ${GOOGLE_CLOUD_CPP_CCACHE_PROGRAM}")
set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE
"${GOOGLE_CLOUD_CPP_CCACHE_PROGRAM}")
set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK
"${GOOGLE_CLOUD_CPP_CCACHE_PROGRAM}")
set(GOOGLE_CLOUD_CPP_EXTERNAL_PROJECT_CCACHE
"-DCMAKE_CXX_COMPILER_LAUNCHER=${GOOGLE_CLOUD_CPP_CCACHE_PROGRAM}"
"-DCMAKE_CC_COMPILER_LAUNCHER=${GOOGLE_CLOUD_CPP_CCACHE_PROGRAM}")
endif ()
endif ()
# Generate docs with relative URLs matching with the directory structure on
# googleapis.dev hositng.
option(GOOGLE_CLOUD_CPP_GEN_DOCS_FOR_GOOGLEAPIS_DEV
"Use relative URLs in docs for googleapis.dev" OFF)
mark_as_advanced(GOOGLE_CLOUD_CPP_GEN_DOCS_FOR_GOOGLEAPIS_DEV)
# Use master as the version part of the relative URLs.
option(GOOGLE_CLOUD_CPP_USE_MASTER_FOR_REFDOC_LINKS
"Use master as the version part for refdoc relative links" OFF)
mark_as_advanced(GOOGLE_CLOUD_CPP_USE_MASTER_FOR_REFDOC_LINKS)
list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
option(GOOGLE_CLOUD_CPP_TESTING_UTIL_ENABLE_INSTALL
"Install the testing utilities." OFF)
mark_as_advanced(GOOGLE_CLOUD_CPP_TESTING_UTIL_ENABLE_INSTALL)
option(GOOGLE_CLOUD_CPP_ENABLE_GRPC_UTILS
"Enable building the gRPC utilities library." ON)
mark_as_advanced(GOOGLE_CLOUD_CPP_ENABLE_GRPC_UTILS)
# 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)
add_subdirectory(google/cloud)