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# Copyright The OpenTelemetry Authors
# SPDX-License-Identifier: Apache-2.0
function(get_directory_name_in_path PATH_VAR RESULT_VAR)
# get_filename_component does not work with paths ending in / or \, so remove it.
string(REGEX REPLACE "[/\\]$" "" PATH_TRIMMED "${PATH_VAR}")
get_filename_component(DIR_NAME ${PATH_TRIMMED} NAME)
set(${RESULT_VAR} "${DIR_NAME}" PARENT_SCOPE)
endfunction()
# Enable building external components through otel-cpp build
# The config options are
# - OPENTELEMETRY_EXTERNAL_COMPONENT_PATH - Setting local paths of the external
# component as env variable. Multiple paths can be set by separating them with.
# - OPENTELEMETRY_EXTERNAL_COMPONENT_URL Setting github-repo of external component
# as env variable
# Add custom vendor component from local path, or GitHub repo
# Prefer CMake option, then env variable, then URL.
if(OPENTELEMETRY_EXTERNAL_COMPONENT_PATH)
# Add custom component path to build tree and consolidate binary artifacts in
# current project binary output directory.
foreach(DIR IN LISTS OPENTELEMETRY_EXTERNAL_COMPONENT_PATH)
get_directory_name_in_path(${DIR} EXTERNAL_EXPORTER_DIR_NAME)
add_subdirectory(${DIR} ${PROJECT_BINARY_DIR}/external/${EXTERNAL_EXPORTER_DIR_NAME})
endforeach()
elseif(DEFINED ENV{OPENTELEMETRY_EXTERNAL_COMPONENT_PATH})
# Add custom component path to build tree and consolidate binary artifacts in
# current project binary output directory.
set(OPENTELEMETRY_EXTERNAL_COMPONENT_PATH_VAR $ENV{OPENTELEMETRY_EXTERNAL_COMPONENT_PATH})
foreach(DIR IN LISTS OPENTELEMETRY_EXTERNAL_COMPONENT_PATH_VAR)
get_directory_name_in_path(${DIR} EXTERNAL_EXPORTER_DIR_NAME)
add_subdirectory(${DIR} ${PROJECT_BINARY_DIR}/external/${EXTERNAL_EXPORTER_DIR_NAME})
endforeach()
elseif(DEFINED $ENV{OPENTELEMETRY_EXTERNAL_COMPONENT_URL})
# This option requires CMake 3.11+: add standard remote repo to build tree.
include(FetchContent)
FetchContent_Declare(
external
GIT_REPOSITORY $ENV{OPENTELEMETRY_EXTERNAL_COMPONENT_URL}
GIT_TAG "main")
FetchContent_GetProperties(external)
if(NOT external_POPULATED)
FetchContent_Populate(external)
add_subdirectory(${external_SOURCE_DIR})
endif()
endif()
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