1*8975f5c5SAndroid Build Coastguard Worker# Copyright 2015 The Chromium Authors 2*8975f5c5SAndroid Build Coastguard Worker# Use of this source code is governed by a BSD-style license that can be 3*8975f5c5SAndroid Build Coastguard Worker# found in the LICENSE file. 4*8975f5c5SAndroid Build Coastguard Worker 5*8975f5c5SAndroid Build Coastguard Workerimport("//build/config/c++/c++.gni") 6*8975f5c5SAndroid Build Coastguard Workerimport("//build/config/cast.gni") 7*8975f5c5SAndroid Build Coastguard Workerimport("//build/config/chrome_build.gni") 8*8975f5c5SAndroid Build Coastguard Workerimport("//build/config/chromeos/args.gni") 9*8975f5c5SAndroid Build Coastguard Workerimport("//build/config/chromeos/ui_mode.gni") 10*8975f5c5SAndroid Build Coastguard Workerimport("//build/config/compiler/pgo/pgo.gni") 11*8975f5c5SAndroid Build Coastguard Workerimport("//build/config/cronet/config.gni") 12*8975f5c5SAndroid Build Coastguard Workerimport("//build/config/sanitizers/sanitizers.gni") 13*8975f5c5SAndroid Build Coastguard Workerimport("//build/toolchain/cc_wrapper.gni") 14*8975f5c5SAndroid Build Coastguard Workerimport("//build/toolchain/toolchain.gni") 15*8975f5c5SAndroid Build Coastguard Workerimport("//build_overrides/build.gni") 16*8975f5c5SAndroid Build Coastguard Worker 17*8975f5c5SAndroid Build Coastguard Workerif (is_android) { 18*8975f5c5SAndroid Build Coastguard Worker import("//build/config/android/abi.gni") 19*8975f5c5SAndroid Build Coastguard Worker} 20*8975f5c5SAndroid Build Coastguard Workerif (current_cpu == "arm" || current_cpu == "arm64") { 21*8975f5c5SAndroid Build Coastguard Worker import("//build/config/arm.gni") 22*8975f5c5SAndroid Build Coastguard Worker} 23*8975f5c5SAndroid Build Coastguard Worker 24*8975f5c5SAndroid Build Coastguard Workerif (is_apple) { 25*8975f5c5SAndroid Build Coastguard Worker import("//build/config/apple/symbols.gni") 26*8975f5c5SAndroid Build Coastguard Worker} 27*8975f5c5SAndroid Build Coastguard Worker 28*8975f5c5SAndroid Build Coastguard Workerdeclare_args() { 29*8975f5c5SAndroid Build Coastguard Worker # Set to true to use lld, the LLVM linker. 30*8975f5c5SAndroid Build Coastguard Worker # In late bring-up on macOS (see docs/mac_lld.md). 31*8975f5c5SAndroid Build Coastguard Worker # Tentatively used on iOS. 32*8975f5c5SAndroid Build Coastguard Worker # The default linker everywhere else. 33*8975f5c5SAndroid Build Coastguard Worker use_lld = is_clang && current_os != "zos" 34*8975f5c5SAndroid Build Coastguard Worker 35*8975f5c5SAndroid Build Coastguard Worker # If true, optimize for size. 36*8975f5c5SAndroid Build Coastguard Worker # Default to favoring speed over size for platforms not listed below. 37*8975f5c5SAndroid Build Coastguard Worker optimize_for_size = 38*8975f5c5SAndroid Build Coastguard Worker !is_high_end_android && (is_android || is_castos || is_fuchsia) 39*8975f5c5SAndroid Build Coastguard Worker} 40*8975f5c5SAndroid Build Coastguard Worker 41*8975f5c5SAndroid Build Coastguard Workerdeclare_args() { 42*8975f5c5SAndroid Build Coastguard Worker # Default to warnings as errors for default workflow, where we catch 43*8975f5c5SAndroid Build Coastguard Worker # warnings with known toolchains. Allow overriding this e.g. for Chromium 44*8975f5c5SAndroid Build Coastguard Worker # builds on Linux that could use a different version of the compiler. 45*8975f5c5SAndroid Build Coastguard Worker # With GCC, warnings in no-Chromium code are always not treated as errors. 46*8975f5c5SAndroid Build Coastguard Worker treat_warnings_as_errors = true 47*8975f5c5SAndroid Build Coastguard Worker 48*8975f5c5SAndroid Build Coastguard Worker # How many symbols to include in the build. This affects the performance of 49*8975f5c5SAndroid Build Coastguard Worker # the build since the symbols are large and dealing with them is slow. 50*8975f5c5SAndroid Build Coastguard Worker # 2 means regular build with symbols. 51*8975f5c5SAndroid Build Coastguard Worker # 1 means minimal symbols, usually enough for backtraces only. Symbols with 52*8975f5c5SAndroid Build Coastguard Worker # internal linkage (static functions or those in anonymous namespaces) may not 53*8975f5c5SAndroid Build Coastguard Worker # appear when using this level. 54*8975f5c5SAndroid Build Coastguard Worker # 0 means no symbols. 55*8975f5c5SAndroid Build Coastguard Worker # -1 means auto-set according to debug/release and platform. 56*8975f5c5SAndroid Build Coastguard Worker symbol_level = -1 57*8975f5c5SAndroid Build Coastguard Worker 58*8975f5c5SAndroid Build Coastguard Worker # Android-only: Strip the debug info of libraries within lib.unstripped to 59*8975f5c5SAndroid Build Coastguard Worker # reduce size. As long as symbol_level > 0, this will still allow stacks to be 60*8975f5c5SAndroid Build Coastguard Worker # symbolized. 61*8975f5c5SAndroid Build Coastguard Worker strip_debug_info = false 62*8975f5c5SAndroid Build Coastguard Worker 63*8975f5c5SAndroid Build Coastguard Worker # Compile in such a way as to enable profiling of the generated code. For 64*8975f5c5SAndroid Build Coastguard Worker # example, don't omit the frame pointer and leave in symbols. 65*8975f5c5SAndroid Build Coastguard Worker enable_profiling = false 66*8975f5c5SAndroid Build Coastguard Worker 67*8975f5c5SAndroid Build Coastguard Worker # use_debug_fission: whether to use split DWARF debug info files. This can 68*8975f5c5SAndroid Build Coastguard Worker # reduce link time significantly. 69*8975f5c5SAndroid Build Coastguard Worker use_debug_fission = 70*8975f5c5SAndroid Build Coastguard Worker !is_android && !is_fuchsia && !is_apple && !is_win && use_lld 71*8975f5c5SAndroid Build Coastguard Worker 72*8975f5c5SAndroid Build Coastguard Worker # Enables support for ThinLTO, which links 3x-10x faster than full LTO. See 73*8975f5c5SAndroid Build Coastguard Worker # also http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html 74*8975f5c5SAndroid Build Coastguard Worker # Use it by default on official-optimized android and Chrome OS builds, but 75*8975f5c5SAndroid Build Coastguard Worker # not ARC or linux-chromeos since it's been seen to not play nicely with 76*8975f5c5SAndroid Build Coastguard Worker # Chrome's clang. crbug.com/1033839 77*8975f5c5SAndroid Build Coastguard Worker # Disabled in iOS cronet builds since build step cronet_static_complete 78*8975f5c5SAndroid Build Coastguard Worker # wants to build a .a file consumable by external clients, and they won't 79*8975f5c5SAndroid Build Coastguard Worker # have the same LLVM revisions as us, making bitcode useless to them. 80*8975f5c5SAndroid Build Coastguard Worker use_thin_lto = 81*8975f5c5SAndroid Build Coastguard Worker is_cfi || (is_clang && is_official_build && chrome_pgo_phase != 1 && 82*8975f5c5SAndroid Build Coastguard Worker (is_linux || is_win || is_mac || 83*8975f5c5SAndroid Build Coastguard Worker (is_ios && use_lld && !is_cronet_build) || 84*8975f5c5SAndroid Build Coastguard Worker (is_android && target_os != "chromeos") || 85*8975f5c5SAndroid Build Coastguard Worker (is_chromeos && is_chromeos_device))) 86*8975f5c5SAndroid Build Coastguard Worker 87*8975f5c5SAndroid Build Coastguard Worker # Whether we're using a sample profile collected on an architecture different 88*8975f5c5SAndroid Build Coastguard Worker # than the one we're compiling for. 89*8975f5c5SAndroid Build Coastguard Worker # 90*8975f5c5SAndroid Build Coastguard Worker # It's currently not possible to collect AFDO profiles on anything but 91*8975f5c5SAndroid Build Coastguard Worker # x86{,_64}. 92*8975f5c5SAndroid Build Coastguard Worker using_mismatched_sample_profile = current_cpu != "x64" && current_cpu != "x86" 93*8975f5c5SAndroid Build Coastguard Worker 94*8975f5c5SAndroid Build Coastguard Worker # Whether an error should be raised on attempts to make debug builds with 95*8975f5c5SAndroid Build Coastguard Worker # is_component_build=false. Very large debug symbols can have unwanted side 96*8975f5c5SAndroid Build Coastguard Worker # effects so this is enforced by default for chromium. 97*8975f5c5SAndroid Build Coastguard Worker forbid_non_component_debug_builds = build_with_chromium 98*8975f5c5SAndroid Build Coastguard Worker 99*8975f5c5SAndroid Build Coastguard Worker # Exclude unwind tables by default for official builds as unwinding can be 100*8975f5c5SAndroid Build Coastguard Worker # done from stack dumps produced by Crashpad at a later time "offline" in the 101*8975f5c5SAndroid Build Coastguard Worker # crash server. Since this increases binary size, we don't recommend including 102*8975f5c5SAndroid Build Coastguard Worker # them in shipping builds. 103*8975f5c5SAndroid Build Coastguard Worker # For unofficial (e.g. development) builds and non-Chrome branded (e.g. Cronet 104*8975f5c5SAndroid Build Coastguard Worker # which doesn't use Crashpad, crbug.com/479283) builds it's useful to be able 105*8975f5c5SAndroid Build Coastguard Worker # to unwind at runtime. 106*8975f5c5SAndroid Build Coastguard Worker # Include the unwind tables on Android even for official builds, as otherwise 107*8975f5c5SAndroid Build Coastguard Worker # the crash dumps generated by Android's debuggerd are largely useless, and 108*8975f5c5SAndroid Build Coastguard Worker # having this additional mechanism to understand issues is particularly helpful 109*8975f5c5SAndroid Build Coastguard Worker # to WebView. 110*8975f5c5SAndroid Build Coastguard Worker exclude_unwind_tables = is_official_build && !is_android 111*8975f5c5SAndroid Build Coastguard Worker 112*8975f5c5SAndroid Build Coastguard Worker # Where to redirect clang crash diagnoses 113*8975f5c5SAndroid Build Coastguard Worker clang_diagnostic_dir = 114*8975f5c5SAndroid Build Coastguard Worker rebase_path("//tools/clang/crashreports", root_build_dir) 115*8975f5c5SAndroid Build Coastguard Worker 116*8975f5c5SAndroid Build Coastguard Worker # Mark binaries as compatible with Shadow Stack of Control-flow Enforcement 117*8975f5c5SAndroid Build Coastguard Worker # Technology (CET). If Windows version and hardware supports the feature and 118*8975f5c5SAndroid Build Coastguard Worker # it's enabled by OS then additional validation of return address will be 119*8975f5c5SAndroid Build Coastguard Worker # performed as mitigation against Return-oriented programming (ROP). 120*8975f5c5SAndroid Build Coastguard Worker # https://chromium.googlesource.com/chromium/src/+/main/docs/design/sandbox.md#cet-shadow-stack 121*8975f5c5SAndroid Build Coastguard Worker enable_cet_shadow_stack = target_cpu == "x64" 122*8975f5c5SAndroid Build Coastguard Worker 123*8975f5c5SAndroid Build Coastguard Worker # Set to true to enable using the ML inliner in LLVM. This currently only 124*8975f5c5SAndroid Build Coastguard Worker # enables the ML inliner when targeting Android. 125*8975f5c5SAndroid Build Coastguard Worker # Currently the ML inliner is only supported on linux hosts 126*8975f5c5SAndroid Build Coastguard Worker use_ml_inliner = host_os == "linux" && is_android && 127*8975f5c5SAndroid Build Coastguard Worker !llvm_android_mainline # https://crbug.com/1468680 128*8975f5c5SAndroid Build Coastguard Worker 129*8975f5c5SAndroid Build Coastguard Worker # Set to true to use the android unwinder V2 implementation. 130*8975f5c5SAndroid Build Coastguard Worker use_android_unwinder_v2 = true 131*8975f5c5SAndroid Build Coastguard Worker 132*8975f5c5SAndroid Build Coastguard Worker # Whether we should consider the profile we're using to be accurate. Accurate 133*8975f5c5SAndroid Build Coastguard Worker # profiles have the benefit of (potentially substantial) binary size 134*8975f5c5SAndroid Build Coastguard Worker # reductions, by instructing the compiler to optimize cold and uncovered 135*8975f5c5SAndroid Build Coastguard Worker # functions heavily for size. This often comes at the cost of performance. 136*8975f5c5SAndroid Build Coastguard Worker sample_profile_is_accurate = optimize_for_size 137*8975f5c5SAndroid Build Coastguard Worker 138*8975f5c5SAndroid Build Coastguard Worker # Use offsets rather than pointers in vtables in order to reduce the number of 139*8975f5c5SAndroid Build Coastguard Worker # relocations. This is safe to enable only when all C++ code is built with the 140*8975f5c5SAndroid Build Coastguard Worker # flag set to the same value. 141*8975f5c5SAndroid Build Coastguard Worker use_relative_vtables_abi = is_android && current_cpu == "arm64" && 142*8975f5c5SAndroid Build Coastguard Worker use_custom_libcxx && !is_component_build 143*8975f5c5SAndroid Build Coastguard Worker} 144*8975f5c5SAndroid Build Coastguard Worker 145*8975f5c5SAndroid Build Coastguard Worker# To try out this combination, delete this assert. 146*8975f5c5SAndroid Build Coastguard Workerassert( 147*8975f5c5SAndroid Build Coastguard Worker !use_relative_vtables_abi || !is_cfi, 148*8975f5c5SAndroid Build Coastguard Worker "is_cfi=true is known to conflict with use_relative_vtables_abi=true.\n" + 149*8975f5c5SAndroid Build Coastguard Worker "See https://bugs.chromium.org/p/chromium/issues/detail?id=1375035#c53") 150*8975f5c5SAndroid Build Coastguard Worker 151*8975f5c5SAndroid Build Coastguard Workerassert(!is_cfi || use_thin_lto, "CFI requires ThinLTO") 152*8975f5c5SAndroid Build Coastguard Workerassert(!enable_profiling || !is_component_build, 153*8975f5c5SAndroid Build Coastguard Worker "Cannot profile component builds (crbug.com/1199271).") 154*8975f5c5SAndroid Build Coastguard Worker 155*8975f5c5SAndroid Build Coastguard Workerif (use_thin_lto && is_debug) { 156*8975f5c5SAndroid Build Coastguard Worker print("WARNING: ThinLTO (use_thin_lto=true) doesn't work with debug" + 157*8975f5c5SAndroid Build Coastguard Worker " (is_debug=true) build.") 158*8975f5c5SAndroid Build Coastguard Worker} 159*8975f5c5SAndroid Build Coastguard Worker 160*8975f5c5SAndroid Build Coastguard Worker# Determine whether to enable or disable frame pointers, based on the platform 161*8975f5c5SAndroid Build Coastguard Worker# and build arguments. 162*8975f5c5SAndroid Build Coastguard Workerif (is_chromeos) { 163*8975f5c5SAndroid Build Coastguard Worker # ChromeOS generally prefers frame pointers, to support CWP. 164*8975f5c5SAndroid Build Coastguard Worker # However, Clang does not currently generate usable frame pointers in ARM 165*8975f5c5SAndroid Build Coastguard Worker # 32-bit builds (https://bugs.llvm.org/show_bug.cgi?id=18505) so disable them 166*8975f5c5SAndroid Build Coastguard Worker # there to avoid the unnecessary overhead. 167*8975f5c5SAndroid Build Coastguard Worker enable_frame_pointers = current_cpu != "arm" 168*8975f5c5SAndroid Build Coastguard Worker} else if (is_apple || is_linux) { 169*8975f5c5SAndroid Build Coastguard Worker enable_frame_pointers = true 170*8975f5c5SAndroid Build Coastguard Worker} else if (is_win) { 171*8975f5c5SAndroid Build Coastguard Worker # 64-bit Windows ABI doesn't support frame pointers. 172*8975f5c5SAndroid Build Coastguard Worker # NOTE: This setting is actually not used in the BUILD.gn for Windows, 173*8975f5c5SAndroid Build Coastguard Worker # but it still reflects correctly that we don't emit frame pointers on x64. 174*8975f5c5SAndroid Build Coastguard Worker if (current_cpu == "x64") { 175*8975f5c5SAndroid Build Coastguard Worker enable_frame_pointers = false 176*8975f5c5SAndroid Build Coastguard Worker } else { 177*8975f5c5SAndroid Build Coastguard Worker enable_frame_pointers = true 178*8975f5c5SAndroid Build Coastguard Worker } 179*8975f5c5SAndroid Build Coastguard Worker} else if (is_android) { 180*8975f5c5SAndroid Build Coastguard Worker enable_frame_pointers = 181*8975f5c5SAndroid Build Coastguard Worker enable_profiling || 182*8975f5c5SAndroid Build Coastguard Worker # Ensure that stacks from arm64 crash dumps are usable (crbug.com/391706). 183*8975f5c5SAndroid Build Coastguard Worker current_cpu == "arm64" || 184*8975f5c5SAndroid Build Coastguard Worker # For x86 Android, unwind tables are huge without frame pointers 185*8975f5c5SAndroid Build Coastguard Worker # (crbug.com/762629). Enabling frame pointers grows the code size slightly 186*8975f5c5SAndroid Build Coastguard Worker # but overall shrinks binaries considerably by avoiding huge unwind 187*8975f5c5SAndroid Build Coastguard Worker # tables. 188*8975f5c5SAndroid Build Coastguard Worker (current_cpu == "x86" && !exclude_unwind_tables && optimize_for_size) || 189*8975f5c5SAndroid Build Coastguard Worker using_sanitizer 190*8975f5c5SAndroid Build Coastguard Worker} else if (is_fuchsia) { 191*8975f5c5SAndroid Build Coastguard Worker # Fuchsia on arm64 could use shadow call stack for unwinding. 192*8975f5c5SAndroid Build Coastguard Worker enable_frame_pointers = current_cpu != "arm64" 193*8975f5c5SAndroid Build Coastguard Worker} else { 194*8975f5c5SAndroid Build Coastguard Worker # Explicitly ask for frame pointers, otherwise stacks may be missing for 195*8975f5c5SAndroid Build Coastguard Worker # sanitizer and profiling builds. 196*8975f5c5SAndroid Build Coastguard Worker enable_frame_pointers = using_sanitizer || enable_profiling || is_debug 197*8975f5c5SAndroid Build Coastguard Worker} 198*8975f5c5SAndroid Build Coastguard Worker 199*8975f5c5SAndroid Build Coastguard Worker# In general assume that if we have frame pointers then we can use them to 200*8975f5c5SAndroid Build Coastguard Worker# unwind the stack. However, this requires that they are enabled by default for 201*8975f5c5SAndroid Build Coastguard Worker# most translation units, that they are emitted correctly, and that the 202*8975f5c5SAndroid Build Coastguard Worker# compiler or platform provides a way to access them. 203*8975f5c5SAndroid Build Coastguard Workercan_unwind_with_frame_pointers = enable_frame_pointers 204*8975f5c5SAndroid Build Coastguard Workerif (current_cpu == "arm" && arm_use_thumb) { 205*8975f5c5SAndroid Build Coastguard Worker # We cannot currently unwind ARM Thumb frame pointers correctly. 206*8975f5c5SAndroid Build Coastguard Worker # See https://bugs.llvm.org/show_bug.cgi?id=18505 207*8975f5c5SAndroid Build Coastguard Worker can_unwind_with_frame_pointers = false 208*8975f5c5SAndroid Build Coastguard Worker} else if (is_win) { 209*8975f5c5SAndroid Build Coastguard Worker # Windows 32-bit does provide frame pointers, but the compiler does not 210*8975f5c5SAndroid Build Coastguard Worker # provide intrinsics to access them, so we don't use them. 211*8975f5c5SAndroid Build Coastguard Worker can_unwind_with_frame_pointers = false 212*8975f5c5SAndroid Build Coastguard Worker} 213*8975f5c5SAndroid Build Coastguard Worker 214*8975f5c5SAndroid Build Coastguard Workerassert(!can_unwind_with_frame_pointers || enable_frame_pointers) 215*8975f5c5SAndroid Build Coastguard Worker 216*8975f5c5SAndroid Build Coastguard Worker# Unwinding with CFI table is only possible on static library builds and 217*8975f5c5SAndroid Build Coastguard Worker# requried only when frame pointers are not enabled. 218*8975f5c5SAndroid Build Coastguard Workercan_unwind_with_cfi_table = is_android && !is_component_build && 219*8975f5c5SAndroid Build Coastguard Worker !enable_frame_pointers && current_cpu == "arm" 220*8975f5c5SAndroid Build Coastguard Worker 221*8975f5c5SAndroid Build Coastguard Worker# Whether or not cfi table should be enabled on arm. 222*8975f5c5SAndroid Build Coastguard Worker# TODO(crbug.com/40133751): Replace can_unwind_with_cfi_table with this once 223*8975f5c5SAndroid Build Coastguard Worker# sampling profiler is enabled on android. 224*8975f5c5SAndroid Build Coastguard Workerenable_arm_cfi_table = is_android && !is_component_build && current_cpu == "arm" 225*8975f5c5SAndroid Build Coastguard Worker 226*8975f5c5SAndroid Build Coastguard Worker# Use relative paths for debug info. This is important to make the build 227*8975f5c5SAndroid Build Coastguard Worker# results independent of the checkout and build directory names, which 228*8975f5c5SAndroid Build Coastguard Worker# in turn is important for reclient compile hit rate. 229*8975f5c5SAndroid Build Coastguard Worker# Setting this to true may make it harder to debug binaries on Linux, see 230*8975f5c5SAndroid Build Coastguard Worker# https://chromium.googlesource.com/chromium/src/+/main/docs/linux/debugging.md#Source-level-debug-with-fdebug_compilation_dir 231*8975f5c5SAndroid Build Coastguard Worker# It's not clear if the crash server will correctly handle dSYMs with relative 232*8975f5c5SAndroid Build Coastguard Worker# paths, so we disable this feature for official benefit. The main benefit is 233*8975f5c5SAndroid Build Coastguard Worker# deterministic builds to reduce compile times, so this is less relevant for 234*8975f5c5SAndroid Build Coastguard Worker# official builders. 235*8975f5c5SAndroid Build Coastguard Workerstrip_absolute_paths_from_debug_symbols_default = 236*8975f5c5SAndroid Build Coastguard Worker is_android || is_fuchsia || is_nacl || (is_win && use_lld) || is_linux || 237*8975f5c5SAndroid Build Coastguard Worker is_chromeos || (is_apple && !enable_dsyms) 238*8975f5c5SAndroid Build Coastguard Worker 239*8975f5c5SAndroid Build Coastguard Worker# If the platform uses stripped absolute paths by default, then we don't expose 240*8975f5c5SAndroid Build Coastguard Worker# it as a configuration option. If this is causing problems, please file a bug. 241*8975f5c5SAndroid Build Coastguard Workerif (strip_absolute_paths_from_debug_symbols_default) { 242*8975f5c5SAndroid Build Coastguard Worker strip_absolute_paths_from_debug_symbols = true 243*8975f5c5SAndroid Build Coastguard Worker} else { 244*8975f5c5SAndroid Build Coastguard Worker declare_args() { 245*8975f5c5SAndroid Build Coastguard Worker strip_absolute_paths_from_debug_symbols = false 246*8975f5c5SAndroid Build Coastguard Worker } 247*8975f5c5SAndroid Build Coastguard Worker} 248*8975f5c5SAndroid Build Coastguard Worker 249*8975f5c5SAndroid Build Coastguard Worker# When absolute_paths in debug symbols, we need to use input root 250*8975f5c5SAndroid Build Coastguard Worker# absolute path to execute remotely in RBE. 251*8975f5c5SAndroid Build Coastguard Workerclang_need_input_root_absolute_path = !strip_absolute_paths_from_debug_symbols 252*8975f5c5SAndroid Build Coastguard Worker 253*8975f5c5SAndroid Build Coastguard Workerif (clang_need_input_root_absolute_path) { 254*8975f5c5SAndroid Build Coastguard Worker compiler_logs = [ "clang_need_input_root_absolute_path=true" ] 255*8975f5c5SAndroid Build Coastguard Worker} else { 256*8975f5c5SAndroid Build Coastguard Worker compiler_logs = [ "clang_need_input_root_absolute_path=false" ] 257*8975f5c5SAndroid Build Coastguard Worker} 258*8975f5c5SAndroid Build Coastguard Worker 259*8975f5c5SAndroid Build Coastguard Worker# TODO: https://issues.chromium.org/40120210 - remove this 260*8975f5c5SAndroid Build Coastguard Worker# once we can use relative path in hmap. 261*8975f5c5SAndroid Build Coastguard Workerclang_need_input_root_absolute_path_for_objc = 262*8975f5c5SAndroid Build Coastguard Worker clang_need_input_root_absolute_path 263*8975f5c5SAndroid Build Coastguard Workerif (target_os == "ios") { 264*8975f5c5SAndroid Build Coastguard Worker # objc/objcxx uses hmap, which contains absolute path 265*8975f5c5SAndroid Build Coastguard Worker # see also b/256536089 266*8975f5c5SAndroid Build Coastguard Worker clang_need_input_root_absolute_path_for_objc = true 267*8975f5c5SAndroid Build Coastguard Worker} 268*8975f5c5SAndroid Build Coastguard Workercompiler_logs += [ "clang_need_input_root_absolute_path_for_objc=$clang_need_input_root_absolute_path_for_objc" ] 269*8975f5c5SAndroid Build Coastguard Worker 270*8975f5c5SAndroid Build Coastguard Worker# If it wasn't manually set, set to an appropriate default. 271*8975f5c5SAndroid Build Coastguard Workerassert(symbol_level >= -1 && symbol_level <= 2, "Invalid symbol_level") 272*8975f5c5SAndroid Build Coastguard Workerif (symbol_level == -1) { 273*8975f5c5SAndroid Build Coastguard Worker if (is_android && !is_component_build && !use_debug_fission) { 274*8975f5c5SAndroid Build Coastguard Worker # Prefer faster & smaller release builds. 275*8975f5c5SAndroid Build Coastguard Worker symbol_level = 1 276*8975f5c5SAndroid Build Coastguard Worker } else if (is_chromeos_device) { 277*8975f5c5SAndroid Build Coastguard Worker # Use lower symbol level in Simple Chrome build for faster link time. 278*8975f5c5SAndroid Build Coastguard Worker # For Simple Chrome, this should take precedence over is_official_build, 279*8975f5c5SAndroid Build Coastguard Worker # turned on by --internal. 280*8975f5c5SAndroid Build Coastguard Worker if ((target_cpu == "x64" || target_cpu == "x86") && !is_debug) { 281*8975f5c5SAndroid Build Coastguard Worker # For release x86/x64 build, specify symbol_level=0 for faster link time. 282*8975f5c5SAndroid Build Coastguard Worker # x86/x64 shows backtraces with symbol_level=0 (arm requires 283*8975f5c5SAndroid Build Coastguard Worker # symbol_level=1). 284*8975f5c5SAndroid Build Coastguard Worker symbol_level = 0 285*8975f5c5SAndroid Build Coastguard Worker } else { 286*8975f5c5SAndroid Build Coastguard Worker symbol_level = 1 287*8975f5c5SAndroid Build Coastguard Worker } 288*8975f5c5SAndroid Build Coastguard Worker } else if (using_sanitizer) { 289*8975f5c5SAndroid Build Coastguard Worker # Sanitizers need line table info for stack traces. They don't need type 290*8975f5c5SAndroid Build Coastguard Worker # info or variable info, so we can leave that out to speed up the build. 291*8975f5c5SAndroid Build Coastguard Worker # Sanitizers also require symbols for filename suppressions to work. 292*8975f5c5SAndroid Build Coastguard Worker symbol_level = 1 293*8975f5c5SAndroid Build Coastguard Worker } else if ((!is_nacl && !is_linux && !is_chromeos && !is_fuchsia && 294*8975f5c5SAndroid Build Coastguard Worker current_os != "aix") || is_debug || is_official_build || 295*8975f5c5SAndroid Build Coastguard Worker is_castos || is_cast_android) { 296*8975f5c5SAndroid Build Coastguard Worker # Linux builds slower by having symbols as part of the target binary, 297*8975f5c5SAndroid Build Coastguard Worker # whereas Mac and Windows have them separate, so in Release Linux, default 298*8975f5c5SAndroid Build Coastguard Worker # them off, but keep them on for Official builds and Chromecast builds. 299*8975f5c5SAndroid Build Coastguard Worker symbol_level = 2 300*8975f5c5SAndroid Build Coastguard Worker } else { 301*8975f5c5SAndroid Build Coastguard Worker symbol_level = 0 302*8975f5c5SAndroid Build Coastguard Worker } 303*8975f5c5SAndroid Build Coastguard Worker} 304*8975f5c5SAndroid Build Coastguard Worker 305*8975f5c5SAndroid Build Coastguard Worker# Split dwarf works only for symbol_level == 2. 306*8975f5c5SAndroid Build Coastguard Workeruse_debug_fission = use_debug_fission && symbol_level == 2 307*8975f5c5SAndroid Build Coastguard Worker 308*8975f5c5SAndroid Build Coastguard Worker# Non-component debug builds with symbol_level = 2 are an undesirable (very slow 309*8975f5c5SAndroid Build Coastguard Worker# build times, almost two-minute link times) combination. This is only checked 310*8975f5c5SAndroid Build Coastguard Worker# when current_toolchain == default_toolchain because the is_component_build 311*8975f5c5SAndroid Build Coastguard Worker# flag is set to false in various components of the build (like nacl) and we 312*8975f5c5SAndroid Build Coastguard Worker# don't want to assert on those. 313*8975f5c5SAndroid Build Coastguard Worker# iOS does not support component builds so add an exception for this platform. 314*8975f5c5SAndroid Build Coastguard Worker# Windows supports huge PDBs so this combination is allowed for those who don't 315*8975f5c5SAndroid Build Coastguard Worker# mind long build times. 316*8975f5c5SAndroid Build Coastguard Workerif (forbid_non_component_debug_builds) { 317*8975f5c5SAndroid Build Coastguard Worker assert( 318*8975f5c5SAndroid Build Coastguard Worker symbol_level != 2 || current_toolchain != default_toolchain || 319*8975f5c5SAndroid Build Coastguard Worker is_component_build || is_fuchsia || is_apple || use_debug_fission || 320*8975f5c5SAndroid Build Coastguard Worker is_android || is_chromeos || is_win, 321*8975f5c5SAndroid Build Coastguard Worker "Can't do non-component builds at symbol_level=2 without use_debug_fission=true") 322*8975f5c5SAndroid Build Coastguard Worker} 323*8975f5c5SAndroid Build Coastguard Worker 324*8975f5c5SAndroid Build Coastguard Worker# TODO(crbug.com/40230692) For Windows, to assemble lzma_sdk's assembly files, 325*8975f5c5SAndroid Build Coastguard Worker# ml64.exe needs to be utilized as llvm-ml cannot yet assemble it. Once llvm-ml 326*8975f5c5SAndroid Build Coastguard Worker# is able to assemble lzma_sdk assembly files, remove this. 327*8975f5c5SAndroid Build Coastguard Worker# LzmaDecOpt.asm only works on x64 and not x86. 328*8975f5c5SAndroid Build Coastguard Worker# https://sourceforge.net/p/sevenzip/discussion/45797/thread/768932e9dd/?limit=25#0d6c 329*8975f5c5SAndroid Build Coastguard Workerdisable_llvm_ml = host_os == "win" && target_cpu == "x64" && !is_msan 330