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Support find_package and install #256

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Support find_package and install #256

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140b234
Replace OPENCENSUS_INCLUDE_DIR with CMAKE_SOURCE_DIR
meastp Dec 4, 2018
b9e1302
Support install and find_package
meastp Dec 11, 2018
43e5789
WIP add headers to the install target
meastp Dec 11, 2018
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27 changes: 24 additions & 3 deletions CMakeLists.txt
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Expand Up @@ -25,13 +25,27 @@ project(opencensus-cpp VERSION 0.3.0 LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(OPENCENSUS_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")

option(BUILD_SHARED_LIBS "Build shared libraries" OFF)

IF(MSVC)
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nit: be consistent IF or if everywhere (I think the trend is towards lowercase).

add_definitions(-DNOMINMAX)
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I think you want target_compile_definitions() in the targets that need this definition, not need to push it on everybody.

ENDIF()

if(CMAKE_BUILD_TYPE STREQUAL "Release")
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This is unusual... is that to avoid installing the headers twice?

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I think so. To be honest I took that example from somewhere else. What is the proper way to do it? :)

option(INSTALL_HEADERS "Install header files" ON)
else()
option(INSTALL_HEADERS "Install header files" OFF)
endif()

list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)

find_package(googletest REQUIRED)
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CMake has a native module to find gtest:

https://cmake.org/cmake/help/latest/module/FindGTest.html

why not use it here?

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Ah, because you want to download it.

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Well, this is the rationale for changing from "inline" ExternalProject_Add to doing it via find_package

  1. Adding install/export failed because I then also had to export the abseil targets, which seemed wrong to me
  2. find_package is then a point of customization: in vcpkg I'll just delete the FindModule.cmake for abseil and googletest, and use the built-in packages for vcpkg
  3. when abseil supports find_package directly (with a install/targets and a config-file) this approach will still work
  4. for GTest the native module is missing gmock, unfortunately :( - else I would be happy to use that
  5. the only thing that does not work properly is that I have to cmake build the abseil and googletest targets before I can build the opencensus. This is because (I think) ExternaProject_Add runs at build time (not configure time) and for some reason cmake is not smart enough to build the dependencies on demand.
    What I want is e.g. to build an opencensus test and automatically build abseil and gtest when they are required, while also supporting install/export for opencensus. I found an approach on stackoverflow, see the other reply. If this works, might that be okay? :)

find_package(abseil REQUIRED)

include(CTest) # Defines option BUILD_TESTING.
enable_testing()

list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
include(OpenCensusDeps)
include(OpenCensusHelpers)

# OpenCensus code.
Expand All @@ -41,3 +55,10 @@ add_subdirectory(opencensus)
if(BUILD_TESTING)
add_subdirectory(examples)
endif()

install(
EXPORT opencensus-targets
FILE opencensus-config.cmake
NAMESPACE opencensus::
DESTINATION share/opencensus
)
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nit: newline at end of file.

278 changes: 278 additions & 0 deletions cmake/Findabseil.cmake
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@@ -0,0 +1,278 @@
# Copyright 2018 The Cartographer Authors
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Is this the right copyright?

#
# 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 3.2)

if(NOT TARGET absl_base)
set(prefix ${CMAKE_STATIC_LIBRARY_PREFIX})
set(suffix ${CMAKE_STATIC_LIBRARY_SUFFIX})
include(${CMAKE_ROOT}/Modules/ExternalProject.cmake)
set(ABSEIL_PROJECT_NAME abseil)
set(ABSEIL_PROJECT_SRC_DIR
${CMAKE_CURRENT_BINARY_DIR}/${ABSEIL_PROJECT_NAME}/src/${ABSEIL_PROJECT_NAME})
set(ABSEIL_PROJECT_BUILD_DIR
${CMAKE_CURRENT_BINARY_DIR}/${ABSEIL_PROJECT_NAME}/src/${ABSEIL_PROJECT_NAME}-build)
set(ABSEIL_INCLUDE_DIRS ${ABSEIL_PROJECT_SRC_DIR})

ExternalProject_Add(${ABSEIL_PROJECT_NAME}
PREFIX ${ABSEIL_PROJECT_NAME}
GIT_REPOSITORY https://github.com/abseil/abseil-cpp.git
GIT_TAG 5441bbe1db5d0f2ca24b5b60166367b0966790af
INSTALL_COMMAND ""
BUILD_COMMAND ${CMAKE_COMMAND} --build "${ABSEIL_PROJECT_BUILD_DIR}"
CMAKE_CACHE_ARGS "-DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON;-DBUILD_TESTING:BOOL=OFF"
BUILD_BYPRODUCTS "${ABSEIL_LIBRARY_PATH};${ABSEIL_DEPENDENT_LIBRARIES}"
)

# absl_algorithm

add_library(absl_algorithm STATIC IMPORTED GLOBAL)
set_target_properties(absl_algorithm
PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/algorithm/${prefix}absl_algorithm${suffix}
)

# absl_base

add_library(absl_base STATIC IMPORTED GLOBAL)
set_target_properties(absl_base
PROPERTIES IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/base/${prefix}absl_base${suffix}
INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_PROJECT_SRC_DIR}
)

set_property(TARGET absl_base
PROPERTY INTERFACE_LINK_LIBRARIES
${ABSEIL_PROJECT_BUILD_DIR}/absl/base/${prefix}absl_dynamic_annotations${suffix}
${ABSEIL_PROJECT_BUILD_DIR}/absl/base/${prefix}absl_malloc_internal${suffix}
${ABSEIL_PROJECT_BUILD_DIR}/absl/base/${prefix}absl_spinlock_wait${suffix}
${ABSEIL_PROJECT_BUILD_DIR}/absl/base/${prefix}absl_throw_delegate${suffix}
)

# absl_container

add_library(absl_container STATIC IMPORTED GLOBAL)
set_target_properties(absl_container
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/container/${prefix}absl_container${suffix}
)
set_property(TARGET absl_container
PROPERTY INTERFACE_LINK_LIBRARIES
${ABSEIL_PROJECT_BUILD_DIR}/absl/container/${prefix}test_instance_tracker_lib${suffix}
)

# absl_debugging

add_library(absl_debugging STATIC IMPORTED GLOBAL)
set_target_properties(absl_debugging
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/debugging/${prefix}absl_debugging${suffix}
)
set_property(TARGET absl_debugging
PROPERTY INTERFACE_LINK_LIBRARIES
${ABSEIL_PROJECT_BUILD_DIR}/absl/debugging/${prefix}absl_symbolize${suffix}
${ABSEIL_PROJECT_BUILD_DIR}/absl/debugging/${prefix}absl_examine_stack${suffix}
${ABSEIL_PROJECT_BUILD_DIR}/absl/debugging/${prefix}absl_failure_signal_handler${suffix}
${ABSEIL_PROJECT_BUILD_DIR}/absl/debugging/${prefix}absl_leak_check${suffix}
${ABSEIL_PROJECT_BUILD_DIR}/absl/debugging/${prefix}absl_stack_consumption${suffix}
${ABSEIL_PROJECT_BUILD_DIR}/absl/debugging/${prefix}absl_stacktrace${suffix}
)

# absl_memory

add_library(absl_memory STATIC IMPORTED GLOBAL)
set_target_properties(absl_memory
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/memory/${prefix}absl_memory${suffix}
)

# absl_meta

add_library(absl_meta STATIC IMPORTED GLOBAL)
set_target_properties(absl_meta
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/meta/${prefix}absl_meta${suffix}
)

# absl_numeric

add_library(absl_numeric STATIC IMPORTED GLOBAL)
set_target_properties(absl_numeric
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/numeric/${prefix}absl_numeric${suffix}
)
set_property(TARGET absl_numeric
PROPERTY INTERFACE_LINK_LIBRARIES
${ABSEIL_PROJECT_BUILD_DIR}/absl/numeric/${prefix}absl_int128${suffix}
)

# absl_strings

add_library(absl_strings STATIC IMPORTED GLOBAL)
set_target_properties(absl_strings
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/strings/${prefix}absl_strings${suffix}
)
set_property(TARGET absl_strings
PROPERTY INTERFACE_LINK_LIBRARIES
${ABSEIL_PROJECT_BUILD_DIR}/absl/strings/${prefix}str_format_internal${suffix}
${ABSEIL_PROJECT_BUILD_DIR}/absl/strings/${prefix}str_format_extension_internal${suffix}
${ABSEIL_PROJECT_BUILD_DIR}/absl/strings/${prefix}absl_str_format${suffix}
)

# absl_synchronization

add_library(absl_synchronization STATIC IMPORTED GLOBAL)
set_target_properties(absl_synchronization
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/synchronization/${prefix}absl_synchronization${suffix}
)

# absl_time

add_library(absl_time STATIC IMPORTED GLOBAL)
set_target_properties(absl_time
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/time/${prefix}absl_time${suffix}
)

# absl_utility

add_library(absl_utility STATIC IMPORTED GLOBAL)
set_target_properties(absl_utility
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/utility/${prefix}absl_utility${suffix}
)

# absl_span

add_library(absl_span STATIC IMPORTED GLOBAL)
set_target_properties(absl_span
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/types/${prefix}absl_span${suffix}
)

# absl_optional

add_library(absl_optional STATIC IMPORTED GLOBAL)
set_target_properties(absl_optional
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/types/${prefix}absl_optional${suffix}
)

# absl_variant

add_library(absl_variant STATIC IMPORTED GLOBAL)
set_target_properties(absl_variant
PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
${ABSEIL_INCLUDE_DIRS}
IMPORTED_LOCATION
${ABSEIL_PROJECT_BUILD_DIR}/absl/types/${prefix}absl_variant${suffix}
)


# missing: absl_hash "${ABSEIL_PROJECT_BUILD_DIR}/absl/hash/${prefix}absl_hash${suffix}"

# absl_types

#add_library(absl_types STATIC IMPORTED GLOBAL)
#set_target_properties(absl_types
# PROPERTIES INTERFACE_INCLUDE_DIRECTORIES
# ${ABSEIL_INCLUDE_DIRS}
#)
#set_target_properties(absl_types
# PROPERTIES INTERFACE_LINK_LIBRRARIES
# "${ABSEIL_PROJECT_BUILD_DIR}/absl/types/${prefix}absl_any${suffix}
# ${ABSEIL_PROJECT_BUILD_DIR}/absl/types/${prefix}absl_bad_any_cast${suffix}
# ${ABSEIL_PROJECT_BUILD_DIR}/absl/types/${prefix}absl_bad_optional_access${suffix}
#
#
# "
#)
#add_dependencies(absl_types ${ABSEIL_PROJECT_NAME})
#add_library(absl::types ALIAS absl_types)

target_link_libraries(absl_algorithm INTERFACE absl_base absl_meta)
target_link_libraries(absl_container INTERFACE absl_algorithm absl_base absl_memory)
target_link_libraries(absl_debugging INTERFACE absl_base)
target_link_libraries(absl_memory INTERFACE absl_meta)
target_link_libraries(absl_meta INTERFACE absl_base)
target_link_libraries(absl_numeric INTERFACE absl_base)
target_link_libraries(absl_strings INTERFACE absl_base absl_memory absl_meta absl_numeric)
target_link_libraries(absl_synchronization INTERFACE absl_base absl_time absl_debugging)
target_link_libraries(absl_time INTERFACE absl_base absl_numeric)
target_link_libraries(absl_utility INTERFACE absl_base absl_meta)
target_link_libraries(absl_span INTERFACE absl_base absl_utility absl_meta absl_algorithm absl_strings)
target_link_libraries(absl_optional INTERFACE absl_utility absl_meta absl_algorithm absl_strings)
target_link_libraries(absl_variant INTERFACE absl_utility absl_meta absl_algorithm absl_strings)

add_dependencies(absl_algorithm ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_base ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_container ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_debugging ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_memory ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_meta ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_numeric ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_strings ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_synchronization ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_time ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_utility ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_span ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_optional ${ABSEIL_PROJECT_NAME})
add_dependencies(absl_variant ${ABSEIL_PROJECT_NAME})

add_library(absl::algorithm ALIAS absl_algorithm)
add_library(absl::base ALIAS absl_base)
add_library(absl::container ALIAS absl_container)
add_library(absl::debugging ALIAS absl_debugging)
add_library(absl::memory ALIAS absl_memory)
add_library(absl::meta ALIAS absl_meta)
add_library(absl::numeric ALIAS absl_numeric)
add_library(absl::strings ALIAS absl_strings)
add_library(absl::synchronization ALIAS absl_synchronization)
add_library(absl::time ALIAS absl_time)
add_library(absl::utility ALIAS absl_utility)
add_library(absl::span ALIAS absl_span)
add_library(absl::optional ALIAS absl_optional)
add_library(absl::variant ALIAS absl_variant)

unset(prefix)
unset(suffix)
endif()
74 changes: 74 additions & 0 deletions cmake/Findgoogletest.cmake
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# Copyright 2018 The Cartographer 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.

cmake_minimum_required(VERSION 3.2)

if(NOT TARGET gtest)
set(prefix ${CMAKE_STATIC_LIBRARY_PREFIX})
set(suffix ${CMAKE_STATIC_LIBRARY_SUFFIX})
include(${CMAKE_ROOT}/Modules/ExternalProject.cmake)
set(GOOGLETEST_PROJECT_NAME googletest)
set(GOOGLETEST_PROJECT_SRC_DIR
"${CMAKE_CURRENT_BINARY_DIR}/${GOOGLETEST_PROJECT_NAME}-prefix/src/${GOOGLETEST_PROJECT_NAME}")
set(GOOGLETEST_PROJECT_BUILD_DIR
"${CMAKE_CURRENT_BINARY_DIR}/${GOOGLETEST_PROJECT_NAME}-prefix/src/${GOOGLETEST_PROJECT_NAME}-build")
set(GOOGLETEST_INCLUDE_DIRS ${GOOGLETEST_PROJECT_SRC_DIR})

include(ExternalProject)
ExternalProject_Add(${GOOGLETEST_PROJECT_NAME}
GIT_REPOSITORY https://github.com/abseil/googletest
GIT_TAG "master"
INSTALL_COMMAND ""
BUILD_COMMAND ${CMAKE_COMMAND} --build "${GOOGLETEST_PROJECT_BUILD_DIR}"
CMAKE_CACHE_ARGS "-Dgtest_force_shared_crt:BOOL=ON"
)

file(MAKE_DIRECTORY ${GOOGLETEST_PROJECT_SRC_DIR}/googletest/include)
file(MAKE_DIRECTORY ${GOOGLETEST_PROJECT_SRC_DIR}/googlemock/include)

add_library(gtest STATIC IMPORTED)
set_target_properties(gtest PROPERTIES
IMPORTED_LOCATION_DEBUG ${GOOGLETEST_PROJECT_BUILD_DIR}/lib/${prefix}gtest${suffix}
IMPORTED_LOCATION_RELEASE ${GOOGLETEST_PROJECT_BUILD_DIR}/lib/${prefix}gtestd${suffix}
IMPORTED_LINK_INTERFACE_LIBRARIES "${CMAKE_THREAD_LIBS_INIT}"
INTERFACE_INCLUDE_DIRECTORIES ${GOOGLETEST_PROJECT_SRC_DIR}/googletest/include)
add_dependencies(gtest googletest)

add_library(gtest_main STATIC IMPORTED)
set_target_properties(gtest_main PROPERTIES
IMPORTED_LOCATION_DEBUG ${GOOGLETEST_PROJECT_BUILD_DIR}/lib/${prefix}gtest_maind${suffix}
IMPORTED_LOCATION_RELEASE ${GOOGLETEST_PROJECT_BUILD_DIR}/lib/${prefix}gtest_main${suffix}
IMPORTED_LINK_INTERFACE_LIBRARIES "${CMAKE_THREAD_LIBS_INIT}"
INTERFACE_INCLUDE_DIRECTORIES ${GOOGLETEST_PROJECT_SRC_DIR}/googletest/include)
add_dependencies(gtest_main googletest)

add_library(gmock STATIC IMPORTED)
set_target_properties(gmock PROPERTIES
IMPORTED_LOCATION_DEBUG ${GOOGLETEST_PROJECT_BUILD_DIR}/lib/${prefix}gmockd${suffix}
IMPORTED_LOCATION_RELEASE ${GOOGLETEST_PROJECT_BUILD_DIR}/lib/${prefix}gmock${suffix}
IMPORTED_LINK_INTERFACE_LIBRARIES "${CMAKE_THREAD_LIBS_INIT}"
INTERFACE_INCLUDE_DIRECTORIES ${GOOGLETEST_PROJECT_SRC_DIR}/googlemock/include)
add_dependencies(gmock googletest)

add_library(gmock_main STATIC IMPORTED)
set_target_properties(gmock_main PROPERTIES
IMPORTED_LOCATION_DEBUG ${GOOGLETEST_PROJECT_BUILD_DIR}/lib/${prefix}gmock_maind${suffix}
IMPORTED_LOCATION_RELEASE ${GOOGLETEST_PROJECT_BUILD_DIR}/lib/${prefix}gmock_main${suffix}
IMPORTED_LINK_INTERFACE_LIBRARIES "${CMAKE_THREAD_LIBS_INIT}"
INTERFACE_INCLUDE_DIRECTORIES ${GOOGLETEST_PROJECT_SRC_DIR}/googlemock/include)
add_dependencies(gmock_main googletest)

unset(prefix)
unset(suffix)
endif()
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