BUILD.gn (2170B)
1 # Copyright 2015 The Chromium Authors 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 import("//chromium/build/config/sysroot.gni") 6 7 # This build configuration is used by both Fuchsia and POSIX systems. 8 assert(is_posix || is_fuchsia) 9 10 group("posix") { 11 visibility = [ "//:optimize_gn_gen" ] 12 } 13 14 # This is included by reference in the //build/config/compiler:runtime_library 15 # config that is applied to all targets. It is here to separate out the logic 16 # that is Posix-only. Please see that target for advice on what should go in 17 # :runtime_library vs. :compiler. 18 config("runtime_library") { 19 asmflags = [] 20 cflags = [] 21 cflags_c = [] 22 cflags_cc = [] 23 cflags_objc = [] 24 cflags_objcc = [] 25 defines = [] 26 ldflags = [] 27 28 if (!is_apple && sysroot != "" && current_os != "zos") { 29 # Pass the sysroot to all C compiler variants, the assembler, and linker. 30 sysroot_flags = [ "--sysroot=" + rebase_path(sysroot, root_build_dir) ] 31 if (is_linux || is_chromeos) { 32 # This is here so that all files get recompiled after a sysroot roll and 33 # when turning the sysroot on or off. (defines are passed via the command 34 # line, and build system rebuilds things when their commandline 35 # changes). Nothing should ever read this define. 36 import("//chromium/build/linux/sysroot_scripts/sysroot.gni") 37 defines += [ "CR_SYSROOT_KEY=$cr_sysroot_key" ] 38 } 39 asmflags += sysroot_flags 40 ldflags += sysroot_flags 41 42 # When use_custom_libcxx=true, some -isystem flags get passed to 43 # cflags_cc to set up libc++ include paths. We want to make sure 44 # the sysroot includes take lower precendence than the libc++ 45 # ones, so they must appear later in the command line. However, 46 # the gn reference states "These variant-specific versions of 47 # cflags* will be appended on the compiler command line after 48 # 'cflags'." Because of this, we must set the sysroot flags for 49 # all cflags variants instead of using 'cflags' directly. 50 cflags_c += sysroot_flags 51 cflags_cc += sysroot_flags 52 cflags_objc += sysroot_flags 53 cflags_objcc += sysroot_flags 54 } 55 }