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- # Copyright 2014 The Chromium Authors. All rights reserved.
- # Use of this source code is governed by a BSD-style license that can be
- # found in the LICENSE file.
- import("//build/config/c++/c++.gni")
- import("//build/config/compiler/compiler.gni")
- import("//build/config/sanitizers/sanitizers.gni")
- import("//build/config/sysroot.gni")
- import("//build/toolchain/toolchain.gni")
- declare_args() {
- # When non empty, overrides the target rpath value. This allows a user to
- # make a Chromium build where binaries and shared libraries are meant to be
- # installed into separate directories, like /usr/bin/chromium and
- # /usr/lib/chromium for instance. It is useful when a build system that
- # generates a whole target root filesystem (like Yocto) is used on top of gn,
- # especially when cross-compiling.
- # Note: this gn arg is similar to gyp target_rpath generator flag.
- gcc_target_rpath = ""
- ldso_path = ""
- }
- # This config causes functions not to be automatically exported from shared
- # libraries. By default, all symbols are exported but this means there are
- # lots of exports that slow everything down. In general we explicitly mark
- # which functions we want to export from components.
- #
- # Some third_party code assumes all functions are exported so this is separated
- # into its own config so such libraries can remove this config to make symbols
- # public again.
- #
- # See http://gcc.gnu.org/wiki/Visibility
- config("symbol_visibility_hidden") {
- cflags = [ "-fvisibility=hidden" ]
- # Visibility attribute is not supported on AIX.
- if (current_os != "aix") {
- cflags_cc = [ "-fvisibility-inlines-hidden" ]
- cflags_objcc = cflags_cc
- }
- }
- # This config is usually set when :symbol_visibility_hidden is removed.
- # It's often a good idea to set visibility explicitly, as there're flags
- # which would error out otherwise (e.g. -fsanitize=cfi-unrelated-cast)
- config("symbol_visibility_default") {
- cflags = [ "-fvisibility=default" ]
- }
- # The rpath is the dynamic library search path. Setting this config on a link
- # step will put the directory where the build generates shared libraries into
- # the rpath.
- #
- # This is required for component builds since the build generates many shared
- # libraries in the build directory that we expect to be automatically loaded.
- # It will be automatically applied in this case by :executable_config.
- #
- # In non-component builds, certain test binaries may expect to load dynamic
- # libraries from the current directory. As long as these aren't distributed,
- # this is OK. For these cases use something like this:
- #
- # if ((is_linux || is_chromeos) && !is_component_build) {
- # configs += [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
- # }
- config("rpath_for_built_shared_libraries") {
- if (!is_android && current_os != "aix" && !is_castos) {
- # Note: Android, Aix don't support rpath. Chromecast has its own logic for
- # setting the rpath in //build/config/chromecast.
- if (current_toolchain != default_toolchain || gcc_target_rpath == "") {
- ldflags = [
- # Want to pass "\$". GN will re-escape as required for ninja.
- "-Wl,-rpath=\$ORIGIN",
- ]
- } else {
- ldflags = [ "-Wl,-rpath=${gcc_target_rpath}" ]
- }
- if (current_toolchain == default_toolchain && ldso_path != "") {
- ldflags += [ "-Wl,--dynamic-linker=${ldso_path}" ]
- }
- }
- }
- if (is_component_build && !is_android) {
- # See the rpath_for... config above for why this is necessary for component
- # builds.
- executable_and_shared_library_configs_ =
- [ ":rpath_for_built_shared_libraries" ]
- } else {
- executable_and_shared_library_configs_ = []
- }
- # Settings for executables.
- config("executable_config") {
- configs = executable_and_shared_library_configs_
- ldflags = [ "-pie" ]
- if (is_android) {
- ldflags += [
- "-Bdynamic",
- "-Wl,-z,nocopyreloc",
- ]
- }
- if (!is_android && current_os != "aix") {
- ldflags += [
- # TODO(GYP): Do we need a check on the binutils version here?
- #
- # Newer binutils don't set DT_RPATH unless you disable "new" dtags
- # and the new DT_RUNPATH doesn't work without --no-as-needed flag.
- "-Wl,--disable-new-dtags",
- ]
- }
- }
- # Settings for shared libraries.
- config("shared_library_config") {
- configs = executable_and_shared_library_configs_
- }
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