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# Functions and macros for handling of JSON-C
#
# Copyright (c) 2024 Netdata Inc.
# SPDX-License-Identifier: GPL-3.0-or-later
# Handle bundling of json-c.
#
# This pulls it in as a sub-project using FetchContent functionality.
#
# This needs to be a function and not a macro for variable scoping
# reasons. All the things we care about from the sub-project are exposed
# as targets, which are globally scoped and not function scoped.
function(netdata_bundle_jsonc)
include(FetchContent)
include(NetdataFetchContentExtra)
message(STATUS "Preparing vendored copy of JSON-C")
if(ENABLE_BUNDLED_JSONC)
set(FETCHCONTENT_TRY_FIND_PACKAGE_MODE NEVER)
endif()
set(FETCHCONTENT_FULLY_DISCONNECTED Off)
# JSON-C supports older versions of CMake than we do, so set
# the correct values for the few policies we actually need.
set(CMAKE_POLICY_DEFAULT_CMP0077 NEW)
# JSON-C's build system does string comparisons against option
# values instead of treating them as booleans, so we need to use
# proper strings for option values instead of just setting them
# to true or false.
set(DISABLE_BSYMBOLIC ON)
set(DISABLE_WERROR ON)
set(DISABLE_EXTRA_LIBS ON)
set(BUILD_SHARED_LIBS OFF)
set(BUILD_STATIC_LIBS ON)
set(BUILD_APPS OFF)
set(repo https://github.com/json-c/json-c)
set(tag b4c371fa0cbc4dcbaccc359ce9e957a22988fb34) # json-c-0.17-20230812
if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.28)
FetchContent_Declare(json-c
GIT_REPOSITORY ${repo}
GIT_TAG ${tag}
CMAKE_ARGS ${NETDATA_CMAKE_PROPAGATE_TOOLCHAIN_ARGS}
EXCLUDE_FROM_ALL
)
else()
FetchContent_Declare(json-c
GIT_REPOSITORY ${repo}
GIT_TAG ${tag}
CMAKE_ARGS ${NETDATA_CMAKE_PROPAGATE_TOOLCHAIN_ARGS}
)
endif()
FetchContent_MakeAvailable_NoInstall(json-c)
message(STATUS "Finished preparing vendored copy of JSON-C")
endfunction()
# Handle setup of json-c for the build.
#
# This will attempt to find json-c using pkg_check_modules. If it finds
# a usable copy, that will be used. If not, it will bundle a vendored copy
# as a sub-project.
#
# Irrespective of how json-c is to be included, library names,
# include directories, and compile definitions will be specified in the
# NETDATA_JSONC_* variables for later use.
macro(netdata_detect_jsonc)
if(NOT ENABLE_BUNDLED_JSONC)
pkg_check_modules(JSONC json-c)
endif()
if(NOT JSONC_FOUND)
set(ENABLE_BUNDLED_JSONC True)
netdata_bundle_jsonc()
set(NETDATA_JSONC_LDFLAGS json-c)
set(NETDATA_JSONC_INCLUDE_DIRS ${PROJECT_BINARY_DIR}/include)
get_target_property(NETDATA_JSONC_CFLAGS_OTHER json-c INTERFACE_COMPILE_DEFINITIONS)
if(NETDATA_JSONC_CFLAGS_OTHER STREQUAL NETDATA_JSONC_CFLAGS_OTHER-NOTFOUND)
set(NETDATA_JSONC_CFLAGS_OTHER "")
endif()
add_custom_command(
OUTPUT ${PROJECT_BINARY_DIR}/include/json-c
COMMAND ${CMAKE_COMMAND} -E make_directory ${PROJECT_BINARY_DIR}/include
COMMAND ${CMAKE_COMMAND} -E create_symlink ${json-c_BINARY_DIR} ${PROJECT_BINARY_DIR}/include/json-c
COMMENT "Create compatibility symlink for vendored JSON-C headers"
DEPENDS json-c
)
add_custom_target(
json-c-compat-link
DEPENDS ${PROJECT_BINARY_DIR}/include/json-c
)
else()
set(NETDATA_JSONC_LDFLAGS ${JSONC_LDFLAGS})
set(NETDATA_JSONC_CFLAGS_OTHER ${JSONC_CFLAGS_OTHER})
set(NETDATA_JSONC_INCLUDE_DIRS ${JSONC_INCLUDE_DIRS})
add_custom_target(json-c-compat-link)
endif()
endmacro()
# Add json-c as a public link dependency of the specified target.
#
# The specified target must already exist, and the netdata_detect_json-c
# macro must have already been run at least once for this to work correctly.
function(netdata_add_jsonc_to_target _target)
if(ENABLE_BUNDLED_JSONC)
target_include_directories(${_target} BEFORE PUBLIC ${NETDATA_JSONC_INCLUDE_DIRS})
else()
target_include_directories(${_target} PUBLIC ${NETDATA_JSONC_INCLUDE_DIRS})
endif()
target_compile_options(${_target} PUBLIC ${NETDATA_JSONC_CFLAGS_OTHER})
target_link_libraries(${_target} PUBLIC ${NETDATA_JSONC_LDFLAGS})
add_dependencies(${_target} json-c-compat-link)
endfunction()
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