1 # Copyright 2015 The Chromium Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 # Toolchain-related configuration that may be needed outside the context of the 6 # toolchain() rules themselves. 7 8 declare_args() { 9 # Enable Link Time Optimization in optimized builds (output programs run 10 # faster, but linking is up to 5-20x slower). 11 # 12 # TODO(pcc): Remove this flag if/when LTO is enabled in official builds. 13 allow_posix_link_time_opt = false 14 15 # Set to true to use lld, the LLVM linker. This flag may be used on Windows 16 # with the shipped LLVM toolchain, or on Linux with a self-built top-of-tree 17 # LLVM toolchain (see llvm_force_head_revision in 18 # build/config/compiler/BUILD.gn). 19 use_lld = false 20 21 if (is_clang) { 22 # Clang compiler version. Clang files are placed at version-dependent paths. 23 clang_version = "3.9.0" 24 } 25 } 26 27 # Subdirectory within root_out_dir for shared library files. 28 # TODO(agrieve): GYP sets this to "lib" for Linux & Android, but this won't work 29 # in GN until support for loadable_module() is added. 30 # See: https://codereview.chromium.org/1236503002/ 31 shlib_subdir = "." 32 33 # Root out dir for shared library files. 34 root_shlib_dir = root_out_dir 35 if (shlib_subdir != ".") { 36 root_shlib_dir += "/$shlib_subdir" 37 } 38 39 # Extension for shared library files (including leading dot). 40 if (is_mac || is_ios) { 41 shlib_extension = ".dylib" 42 } else if (is_android && is_component_build) { 43 # By appending .cr, we prevent name collisions with libraries already 44 # loaded by the Android zygote. 45 shlib_extension = ".cr.so" 46 } else if (is_posix) { 47 shlib_extension = ".so" 48 } else if (is_win) { 49 shlib_extension = ".dll" 50 } else { 51 assert(false, "Platform not supported") 52 } 53 54 # Prefix for shared library files. 55 if (is_posix) { 56 shlib_prefix = "lib" 57 } else { 58 shlib_prefix = "" 59 } 60 61 # While other "tool"s in a toolchain are specific to the target of that 62 # toolchain, the "stamp" and "copy" tools are really generic to the host; 63 # but each toolchain must define them separately. GN doesn't allow a 64 # template instantiation inside a toolchain definition, so some boilerplate 65 # has to be repeated in each toolchain to define these two tools. These 66 # four variables reduce the duplication in that boilerplate. 67 stamp_description = "STAMP {{output}}" 68 copy_description = "COPY {{source}} {{output}}" 69 if (host_os == "win") { 70 stamp_command = "$python_path gyp-win-tool stamp {{output}}" 71 copy_command = 72 "$python_path gyp-win-tool recursive-mirror {{source}} {{output}}" 73 } else { 74 stamp_command = "touch {{output}}" 75 copy_command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})" 76 } 77
