gn/perfetto.gni - platform/external/perfetto - Git at Google

 # Copyright (C) 2017 The Android Open Source Project
 #
 # 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.

 import("//build_overrides/build.gni")
 import("wasm_vars.gni")

 # Summary of our typical build configurations:

 # 1. Standalone builds
 #    build_with_chromium = false
 #    is_perfetto_build_generator = false
 #    perfetto_build_standalone = true
 #    perfetto_build_with_android = false
 #    perfetto_build_with_embedder = false

 # 2. Android tree builds
 #    build_with_chromium = false
 #    is_perfetto_build_generator = true
 #    perfetto_build_standalone = false
 #    perfetto_build_with_android = true
 #    perfetto_build_with_embedder = false

 # 3. Chromium tree builds
 #    build_with_chromium = true
 #    is_perfetto_build_generator = false
 #    perfetto_build_standalone = false
 #    perfetto_build_with_android = false
 #    perfetto_build_with_embedder = true

 # 4. Builds in other embedder trees (e.g. V8 standalone)
 #    build_with_chromium = false
 #    is_perfetto_build_generator = false
 #    perfetto_build_standalone = false
 #    perfetto_build_with_android = false
 #    perfetto_build_with_embedder = true

 # 5. Amalgamated sources (Client library)
 #    build_with_chromium = false
 #    is_perfetto_build_generator = true
 #    perfetto_build_standalone = false
 #    perfetto_build_with_android = false
 #    perfetto_build_with_embedder = true

 # +----------------------------------------------------------------------------+
 # | Toolchain / environment related configuration                              |
 # +----------------------------------------------------------------------------+
 # This section contains a bunch of variables that are related with the toolchain
 # and the build environment. Only tools/gen_xxx should customize them.

 # Note that |build_with_chromium| is a global convention used by several
 # projects, set outside of our control.

 # Chromium sets this to true in its //build_overrides/build.gni.
 if (!defined(build_with_chromium)) {
   build_with_chromium = false
 }

 declare_args() {
   # The Android blueprint file generator set this to true (as well as
   # is_perfetto_build_generator). This is just about being built in the
   # Android tree (AOSP and internal) and is NOT related with the target OS.
   # In standalone Android builds and Chromium Android builds, this is false.
   perfetto_build_with_android = false

   # All the tools/gen_* scripts set this to true. This is mainly used to locate
   # .gni files from //gn rather than //build.
   is_perfetto_build_generator = false

   # This is for override via `gn args` (e.g. for tools/gen_xxx). Embedders
   # based on GN (e.g. v8) should NOT set this and instead directly sets
   # perfetto_build_with_embedder=true in their GN files.
   is_perfetto_embedder = false
 }

 # This can be overridden by embedders (e.g. v8) in their .gn(i) files. This must
 # be different from the GN args flag (is_perfetto_embedder) because of the way
 # GN works.
 if (!defined(perfetto_build_with_embedder)) {
   perfetto_build_with_embedder = build_with_chromium || is_perfetto_embedder
 }

 perfetto_build_standalone =
     !perfetto_build_with_android && !build_with_chromium &&
     !perfetto_build_with_embedder

 # Only relevant for GN builds. Sets the path where perfetto lives. This is //
 # for standalone builds and //third_party/perfetto/ in embedders. The embedder
 # can ovverride it in its GN files.
 if (perfetto_build_standalone || is_perfetto_build_generator) {
   perfetto_root_path = "//"
   import("//gn/standalone/android.gni")  # For android_api_level
   import("//gn/standalone/sanitizers/vars.gni")  # For is_fuzzer
 } else if (!defined(perfetto_root_path)) {
   perfetto_root_path = "//third_party/perfetto/"
   import("//build/config/android/config.gni")  # For android_api_level
 }

 # Whether the ftrace producer and the service should be started
 # by the integration test or assumed to be running.
 # If we're building in the Android tree, we expect that the testing infra
 # will start the binaries in the system image before the tests are run.
 # In all other cases (i.e. when true), a temporary in-process instance will be
 # brought up by our own integrationtest harness.
 start_daemons_for_testing = !perfetto_build_with_android

 # +----------------------------------------------------------------------------+
 # | Tunable build variables for embedders                                      |
 # +----------------------------------------------------------------------------+
 # The variables in this section allow embedders to enable/disable features
 # at the build-system level. This allows to opt-in into the various services
 # and tools.

 perfetto_force_dlog_default = ""
 if (build_with_chromium) {
   perfetto_force_dlog_default = "off"
 }

 declare_args() {
   # Platform-wide tracing executables (traced, traced_probes, perfetto_cmd).
   enable_perfetto_platform_services =
       perfetto_build_standalone || perfetto_build_with_android

   # Allow the embedder to use the IPC layer. In turn this allows to use the
   # system backend in the client library.
   # This includes building things that rely on POSIX sockets, this places
   # limitations on the supported operating systems.
   enable_perfetto_ipc = (is_android || is_linux || is_mac) &&
                         (perfetto_build_standalone ||
                          perfetto_build_with_android || build_with_chromium)

   # Makes the heap profiling daemon target reachable. It works only on Android,
   # but is built on Linux as well for test/compiler coverage.
   # On Android, it requires API level 26 due to libunwindstack.
   enable_perfetto_heapprofd =
       perfetto_build_with_android ||
       (perfetto_build_standalone && is_clang &&
        (is_linux || (is_android && android_api_level >= 26)))

   # Build the perf event profiler (traced_perf).
   # TODO(b/144281346): under development.
   enable_perfetto_traced_perf =
       perfetto_build_with_android ||
       (perfetto_build_standalone && (is_linux || is_android))

   # The Trace Processor: offline analytical engine to process traces and compute
   # metrics using a SQL engine.
   enable_perfetto_trace_processor =
       perfetto_build_standalone || build_with_chromium ||
       is_perfetto_build_generator

   # Enables base::Watchdog. Is supported only on Linux-based platforms.
   # gn/BUILD.gn further restricts this to OS_LINUX || OS_ANDROID when generating
   # the perfetto_build_flags.h header.
   enable_perfetto_watchdog =
       perfetto_build_with_android || perfetto_build_standalone

   # Misc host executable under tools/.
   enable_perfetto_tools =
       perfetto_build_standalone || perfetto_build_with_android

   enable_perfetto_unittests = perfetto_build_standalone ||
                               build_with_chromium || perfetto_build_with_android

   enable_perfetto_integration_tests =
       perfetto_build_standalone || perfetto_build_with_android

   enable_perfetto_benchmarks = perfetto_build_standalone

   enable_perfetto_fuzzers =
       perfetto_build_standalone && defined(is_fuzzer) && is_fuzzer

   # Enables the gen_git_revision tool that generates a .h that contains a macro
   # with the current git revision. Works only in standalone GN checkouts.
   # If disabled, the version string will be "unknown".
   enable_perfetto_version_gen =
       perfetto_build_standalone && !is_perfetto_build_generator

   # Only for local development. When true the binaries (perfetto, traced, ...)
   # are monolithic and don't use a common shared library. This is mainly to
   # avoid LD_LIBRARY_PATH dances when testing locally.
   monolithic_binaries = false

   # Whether DLOG should be enabled on debug builds (""), all builds ("on"), or
   # none ("off"). We disable it by default for embedders to avoid spamming their
   # console.
   perfetto_force_dlog = perfetto_force_dlog_default
 }

 declare_args() {
   # Enables the SQL query layer of trace processor.
   enable_perfetto_trace_processor_sqlite =
       enable_perfetto_trace_processor && !(build_with_chromium && is_android)

   # Enables the optional SQLite percentile module.
   enable_perfetto_trace_processor_percentile =
       enable_perfetto_trace_processor && perfetto_build_standalone

   # Enables the REPL interactive prompt in the trace processor.
   enable_perfetto_trace_processor_linenoise =
       perfetto_build_standalone && enable_perfetto_trace_processor &&
       (is_linux || is_android || is_mac)

   # Enables ftrace support in the trace processor.
   enable_perfetto_trace_processor_ftrace =
       enable_perfetto_trace_processor && !(build_with_chromium && is_android)

   # Enables parsing support for system probes in trace processor.
   enable_perfetto_trace_processor_system_probes =
       enable_perfetto_trace_processor && !(build_with_chromium && is_android)

   # Enables parsing support for android system probes in trace processor.
   enable_perfetto_trace_processor_android_probes =
       enable_perfetto_trace_processor && !(build_with_chromium && is_android)

   # Enables parsing support for heap graphs in trace processor.
   enable_perfetto_trace_processor_heap_graphs =
       enable_perfetto_trace_processor && !(build_with_chromium && is_android)

   # Enables graphics event support in the trace processor.
   enable_perfetto_trace_processor_graphics =
       enable_perfetto_trace_processor && !(build_with_chromium && is_android)

   # Enables JSON support in the trace processor. Required for JSON trace import
   # and export. Importer support can also be disabled using
   # |enable_perfetto_trace_processor_json_import|.
   enable_perfetto_trace_processor_json =
       enable_perfetto_trace_processor && !perfetto_build_with_android

   # Enables Fuchsia trace format support in trace processor.
   enable_perfetto_trace_processor_fuchsia =
       enable_perfetto_trace_processor && !(build_with_chromium && is_android)

   # Enables httpd RPC support in the trace processor.
   # Further per-OS conditionals are applied in gn/BUILD.gn.
   enable_perfetto_trace_processor_httpd =
       enable_perfetto_trace_processor && perfetto_build_standalone
 }

 declare_args() {
   # Enables importer support for JSON traces in the trace processor.
   enable_perfetto_trace_processor_json_import =
       enable_perfetto_trace_processor_json &&
       !(build_with_chromium && is_android)

   # Enables syscall support in trace processor. Required for ftrace, system
   # probes, and android probes support.
   enable_perfetto_trace_processor_syscalls =
       enable_perfetto_trace_processor_ftrace ||
       enable_perfetto_trace_processor_system_probes ||
       enable_perfetto_trace_processor_android_probes

   # Enables metrics support in the trace processor, which require SQL support.
   enable_perfetto_trace_processor_metrics =
       enable_perfetto_trace_processor_sqlite

   # Enables the trace_to_text tool.
   enable_perfetto_tools_trace_to_text =
       enable_perfetto_tools && enable_perfetto_trace_processor_sqlite

   # Allows to build the UI (TypeScript/ HTML / WASM)
   enable_perfetto_ui =
       perfetto_build_standalone && enable_perfetto_trace_processor_sqlite
 }

 # +---------------------------------------------------------------------------+
 # | Cross-checks                                                              |
 # +---------------------------------------------------------------------------+

 # Exactly one between build_with_android, build_standalone and
 # build_with_embedder must be true.
 assert(perfetto_build_standalone || perfetto_build_with_android ||
        perfetto_build_with_embedder)
 assert(!(perfetto_build_with_android && perfetto_build_standalone))
 assert(!(perfetto_build_with_embedder && perfetto_build_standalone))
 assert(!(perfetto_build_with_android && perfetto_build_with_embedder))

 # If |build_with_chromium| is true then also |perfetto_build_with_embedder|
 # must be true
 assert(!build_with_chromium || perfetto_build_with_embedder)

 # If |perfetto_build_with_android| is true then also
 # |is_perfetto_build_generator| must be true.
 assert(!perfetto_build_with_android || is_perfetto_build_generator)

 # The IPC layer based on UNIX sockets can't be built on Win.
 assert(!enable_perfetto_ipc || !is_win)

 # We should never end up in a state where is_perfetto_embedder=true but
 # perfetto_build_with_embedder=false.
 assert(!is_perfetto_embedder || perfetto_build_with_embedder)

 # The monolithic binaries is not supported when building in the Android tree.
 assert(!monolithic_binaries || !perfetto_build_with_android)

 # Watchdog must be on in Android builds.
 assert(enable_perfetto_watchdog || !perfetto_build_with_android)

 assert(perfetto_force_dlog == "" || perfetto_force_dlog == "on" ||
        perfetto_force_dlog == "off")

 # Metrics, the UI, and trace to text require SQLite support in trace processor.
 assert(!enable_perfetto_trace_processor_metrics ||
        enable_perfetto_trace_processor_sqlite)
 assert(!enable_perfetto_tools_trace_to_text ||
        enable_perfetto_trace_processor_sqlite)
 assert(!enable_perfetto_ui || enable_perfetto_trace_processor_sqlite)

 # Syscall support is required for ftrace, system probes, and android probes.
 assert(enable_perfetto_trace_processor_syscalls ||
        (!enable_perfetto_trace_processor_ftrace &&
         !enable_perfetto_trace_processor_system_probes &&
         !enable_perfetto_trace_processor_android_probes))
	# Copyright (C) 2017 The Android Open Source Project
	#
	# 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.

	import("//build_overrides/build.gni")
	import("wasm_vars.gni")

	# Summary of our typical build configurations:

	# 1. Standalone builds
	# build_with_chromium = false
	# is_perfetto_build_generator = false
	# perfetto_build_standalone = true
	# perfetto_build_with_android = false
	# perfetto_build_with_embedder = false

	# 2. Android tree builds
	# build_with_chromium = false
	# is_perfetto_build_generator = true
	# perfetto_build_standalone = false
	# perfetto_build_with_android = true
	# perfetto_build_with_embedder = false

	# 3. Chromium tree builds
	# build_with_chromium = true
	# is_perfetto_build_generator = false
	# perfetto_build_standalone = false
	# perfetto_build_with_android = false
	# perfetto_build_with_embedder = true

	# 4. Builds in other embedder trees (e.g. V8 standalone)
	# build_with_chromium = false
	# is_perfetto_build_generator = false
	# perfetto_build_standalone = false
	# perfetto_build_with_android = false
	# perfetto_build_with_embedder = true

	# 5. Amalgamated sources (Client library)
	# build_with_chromium = false
	# is_perfetto_build_generator = true
	# perfetto_build_standalone = false
	# perfetto_build_with_android = false
	# perfetto_build_with_embedder = true

	# +----------------------------------------------------------------------------+
	# \| Toolchain / environment related configuration \|
	# +----------------------------------------------------------------------------+
	# This section contains a bunch of variables that are related with the toolchain
	# and the build environment. Only tools/gen_xxx should customize them.

	# Note that \|build_with_chromium\| is a global convention used by several
	# projects, set outside of our control.

	# Chromium sets this to true in its //build_overrides/build.gni.
	if (!defined(build_with_chromium)) {
	build_with_chromium = false
	}

	declare_args() {
	# The Android blueprint file generator set this to true (as well as
	# is_perfetto_build_generator). This is just about being built in the
	# Android tree (AOSP and internal) and is NOT related with the target OS.
	# In standalone Android builds and Chromium Android builds, this is false.
	perfetto_build_with_android = false

	# All the tools/gen_* scripts set this to true. This is mainly used to locate
	# .gni files from //gn rather than //build.
	is_perfetto_build_generator = false

	# This is for override via `gn args` (e.g. for tools/gen_xxx). Embedders
	# based on GN (e.g. v8) should NOT set this and instead directly sets
	# perfetto_build_with_embedder=true in their GN files.
	is_perfetto_embedder = false
	}

	# This can be overridden by embedders (e.g. v8) in their .gn(i) files. This must
	# be different from the GN args flag (is_perfetto_embedder) because of the way
	# GN works.
	if (!defined(perfetto_build_with_embedder)) {
	perfetto_build_with_embedder = build_with_chromium \|\| is_perfetto_embedder
	}

	perfetto_build_standalone =
	!perfetto_build_with_android && !build_with_chromium &&
	!perfetto_build_with_embedder

	# Only relevant for GN builds. Sets the path where perfetto lives. This is //
	# for standalone builds and //third_party/perfetto/ in embedders. The embedder
	# can ovverride it in its GN files.
	if (perfetto_build_standalone \|\| is_perfetto_build_generator) {
	perfetto_root_path = "//"
	import("//gn/standalone/android.gni") # For android_api_level
	import("//gn/standalone/sanitizers/vars.gni") # For is_fuzzer
	} else if (!defined(perfetto_root_path)) {
	perfetto_root_path = "//third_party/perfetto/"
	import("//build/config/android/config.gni") # For android_api_level
	}

	# Whether the ftrace producer and the service should be started
	# by the integration test or assumed to be running.
	# If we're building in the Android tree, we expect that the testing infra
	# will start the binaries in the system image before the tests are run.
	# In all other cases (i.e. when true), a temporary in-process instance will be
	# brought up by our own integrationtest harness.
	start_daemons_for_testing = !perfetto_build_with_android

	# +----------------------------------------------------------------------------+
	# \| Tunable build variables for embedders \|
	# +----------------------------------------------------------------------------+
	# The variables in this section allow embedders to enable/disable features
	# at the build-system level. This allows to opt-in into the various services
	# and tools.

	perfetto_force_dlog_default = ""
	if (build_with_chromium) {
	perfetto_force_dlog_default = "off"
	}

	declare_args() {
	# Platform-wide tracing executables (traced, traced_probes, perfetto_cmd).
	enable_perfetto_platform_services =
	perfetto_build_standalone \|\| perfetto_build_with_android

	# Allow the embedder to use the IPC layer. In turn this allows to use the
	# system backend in the client library.
	# This includes building things that rely on POSIX sockets, this places
	# limitations on the supported operating systems.
	enable_perfetto_ipc = (is_android \|\| is_linux \|\| is_mac) &&
	(perfetto_build_standalone \|\|
	perfetto_build_with_android \|\| build_with_chromium)

	# Makes the heap profiling daemon target reachable. It works only on Android,
	# but is built on Linux as well for test/compiler coverage.
	# On Android, it requires API level 26 due to libunwindstack.
	enable_perfetto_heapprofd =
	perfetto_build_with_android \|\|
	(perfetto_build_standalone && is_clang &&
	(is_linux \|\| (is_android && android_api_level >= 26)))

	# Build the perf event profiler (traced_perf).
	# TODO(b/144281346): under development.
	enable_perfetto_traced_perf =
	perfetto_build_with_android \|\|
	(perfetto_build_standalone && (is_linux \|\| is_android))

	# The Trace Processor: offline analytical engine to process traces and compute
	# metrics using a SQL engine.
	enable_perfetto_trace_processor =
	perfetto_build_standalone \|\| build_with_chromium \|\|
	is_perfetto_build_generator

	# Enables base::Watchdog. Is supported only on Linux-based platforms.
	# gn/BUILD.gn further restricts this to OS_LINUX \|\| OS_ANDROID when generating
	# the perfetto_build_flags.h header.
	enable_perfetto_watchdog =
	perfetto_build_with_android \|\| perfetto_build_standalone

	# Misc host executable under tools/.
	enable_perfetto_tools =
	perfetto_build_standalone \|\| perfetto_build_with_android

	enable_perfetto_unittests = perfetto_build_standalone \|\|
	build_with_chromium \|\| perfetto_build_with_android

	enable_perfetto_integration_tests =
	perfetto_build_standalone \|\| perfetto_build_with_android

	enable_perfetto_benchmarks = perfetto_build_standalone

	enable_perfetto_fuzzers =
	perfetto_build_standalone && defined(is_fuzzer) && is_fuzzer

	# Enables the gen_git_revision tool that generates a .h that contains a macro
	# with the current git revision. Works only in standalone GN checkouts.
	# If disabled, the version string will be "unknown".
	enable_perfetto_version_gen =
	perfetto_build_standalone && !is_perfetto_build_generator

	# Only for local development. When true the binaries (perfetto, traced, ...)
	# are monolithic and don't use a common shared library. This is mainly to
	# avoid LD_LIBRARY_PATH dances when testing locally.
	monolithic_binaries = false

	# Whether DLOG should be enabled on debug builds (""), all builds ("on"), or
	# none ("off"). We disable it by default for embedders to avoid spamming their
	# console.
	perfetto_force_dlog = perfetto_force_dlog_default
	}

	declare_args() {
	# Enables the SQL query layer of trace processor.
	enable_perfetto_trace_processor_sqlite =
	enable_perfetto_trace_processor && !(build_with_chromium && is_android)

	# Enables the optional SQLite percentile module.
	enable_perfetto_trace_processor_percentile =
	enable_perfetto_trace_processor && perfetto_build_standalone

	# Enables the REPL interactive prompt in the trace processor.
	enable_perfetto_trace_processor_linenoise =
	perfetto_build_standalone && enable_perfetto_trace_processor &&
	(is_linux \|\| is_android \|\| is_mac)

	# Enables ftrace support in the trace processor.
	enable_perfetto_trace_processor_ftrace =
	enable_perfetto_trace_processor && !(build_with_chromium && is_android)

	# Enables parsing support for system probes in trace processor.
	enable_perfetto_trace_processor_system_probes =
	enable_perfetto_trace_processor && !(build_with_chromium && is_android)

	# Enables parsing support for android system probes in trace processor.
	enable_perfetto_trace_processor_android_probes =
	enable_perfetto_trace_processor && !(build_with_chromium && is_android)

	# Enables parsing support for heap graphs in trace processor.
	enable_perfetto_trace_processor_heap_graphs =
	enable_perfetto_trace_processor && !(build_with_chromium && is_android)

	# Enables graphics event support in the trace processor.
	enable_perfetto_trace_processor_graphics =
	enable_perfetto_trace_processor && !(build_with_chromium && is_android)

	# Enables JSON support in the trace processor. Required for JSON trace import
	# and export. Importer support can also be disabled using
	# \|enable_perfetto_trace_processor_json_import\|.
	enable_perfetto_trace_processor_json =
	enable_perfetto_trace_processor && !perfetto_build_with_android

	# Enables Fuchsia trace format support in trace processor.
	enable_perfetto_trace_processor_fuchsia =
	enable_perfetto_trace_processor && !(build_with_chromium && is_android)

	# Enables httpd RPC support in the trace processor.
	# Further per-OS conditionals are applied in gn/BUILD.gn.
	enable_perfetto_trace_processor_httpd =
	enable_perfetto_trace_processor && perfetto_build_standalone
	}

	declare_args() {
	# Enables importer support for JSON traces in the trace processor.
	enable_perfetto_trace_processor_json_import =
	enable_perfetto_trace_processor_json &&
	!(build_with_chromium && is_android)

	# Enables syscall support in trace processor. Required for ftrace, system
	# probes, and android probes support.
	enable_perfetto_trace_processor_syscalls =
	enable_perfetto_trace_processor_ftrace \|\|
	enable_perfetto_trace_processor_system_probes \|\|
	enable_perfetto_trace_processor_android_probes

	# Enables metrics support in the trace processor, which require SQL support.
	enable_perfetto_trace_processor_metrics =
	enable_perfetto_trace_processor_sqlite

	# Enables the trace_to_text tool.
	enable_perfetto_tools_trace_to_text =
	enable_perfetto_tools && enable_perfetto_trace_processor_sqlite

	# Allows to build the UI (TypeScript/ HTML / WASM)
	enable_perfetto_ui =
	perfetto_build_standalone && enable_perfetto_trace_processor_sqlite
	}

	# +---------------------------------------------------------------------------+
	# \| Cross-checks \|
	# +---------------------------------------------------------------------------+

	# Exactly one between build_with_android, build_standalone and
	# build_with_embedder must be true.
	assert(perfetto_build_standalone \|\| perfetto_build_with_android \|\|
	perfetto_build_with_embedder)
	assert(!(perfetto_build_with_android && perfetto_build_standalone))
	assert(!(perfetto_build_with_embedder && perfetto_build_standalone))
	assert(!(perfetto_build_with_android && perfetto_build_with_embedder))

	# If \|build_with_chromium\| is true then also \|perfetto_build_with_embedder\|
	# must be true
	assert(!build_with_chromium \|\| perfetto_build_with_embedder)

	# If \|perfetto_build_with_android\| is true then also
	# \|is_perfetto_build_generator\| must be true.
	assert(!perfetto_build_with_android \|\| is_perfetto_build_generator)

	# The IPC layer based on UNIX sockets can't be built on Win.
	assert(!enable_perfetto_ipc \|\| !is_win)

	# We should never end up in a state where is_perfetto_embedder=true but
	# perfetto_build_with_embedder=false.
	assert(!is_perfetto_embedder \|\| perfetto_build_with_embedder)

	# The monolithic binaries is not supported when building in the Android tree.
	assert(!monolithic_binaries \|\| !perfetto_build_with_android)

	# Watchdog must be on in Android builds.
	assert(enable_perfetto_watchdog \|\| !perfetto_build_with_android)

	assert(perfetto_force_dlog == "" \|\| perfetto_force_dlog == "on" \|\|
	perfetto_force_dlog == "off")

	# Metrics, the UI, and trace to text require SQLite support in trace processor.
	assert(!enable_perfetto_trace_processor_metrics \|\|
	enable_perfetto_trace_processor_sqlite)
	assert(!enable_perfetto_tools_trace_to_text \|\|
	enable_perfetto_trace_processor_sqlite)
	assert(!enable_perfetto_ui \|\| enable_perfetto_trace_processor_sqlite)

	# Syscall support is required for ftrace, system probes, and android probes.
	assert(enable_perfetto_trace_processor_syscalls \|\|
	(!enable_perfetto_trace_processor_ftrace &&
	!enable_perfetto_trace_processor_system_probes &&
	!enable_perfetto_trace_processor_android_probes))