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# Copyright (c) 2014 The Native Client 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/nacl/config.gni")
# Native Client Definitions
config("nacl_defines") {
if (is_linux || is_android || is_nacl) {
defines = [
"_POSIX_C_SOURCE=199506",
"_XOPEN_SOURCE=600",
"_GNU_SOURCE=1",
"__STDC_LIMIT_MACROS=1",
]
} else if (is_win) {
defines = [ "__STDC_LIMIT_MACROS=1" ]
}
if (current_cpu == "pnacl" && !is_nacl_nonsfi) {
# TODO: Remove the following definition once NACL_BUILD_ARCH and
# NACL_BUILD_SUBARCH are defined by the PNaCl toolchain.
defines += [ "NACL_BUILD_ARCH=pnacl" ]
}
}
config("nexe_defines") {
defines = [
"DYNAMIC_ANNOTATIONS_ENABLED=1",
"DYNAMIC_ANNOTATIONS_PREFIX=NACL_",
]
}
config("nacl_warnings") {
if (is_win) {
# Some NaCl code uses forward declarations of static const variables,
# with initialized definitions later on. (The alternative would be
# many, many more forward declarations of everything used in that
# const variable's initializer before the definition.) The Windows
# compiler is too stupid to notice that there is an initializer later
# in the file, and warns about the forward declaration.
cflags = [ "/wd4132" ]
}
}
# The base target that all targets in the NaCl build should depend on.
# This allows configs to be modified for everything in the NaCl build, even when
# the NaCl build is composed into the Chrome build. (GN has no functionality to
# add flags to everything in //native_client, having a base target works around
# that limitation.)
source_set("nacl_base") {
public_configs = [
":nacl_defines",
":nacl_warnings",
]
if (current_os == "nacl") {
public_configs += [ ":nexe_defines" ]
}
}
config("compiler") {
configs = []
cflags = []
ldflags = []
libs = []
if (is_clang && current_cpu != "pnacl") {
# -no-integrated-as is the default in nacl-clang for historical
# compatibility with inline assembly code and so forth. But there
# are no such cases in Chromium code, and -integrated-as is nicer in
# general. Moreover, the IRT must be built using LLVM's assembler
# on x86-64 to preserve sandbox base address hiding. Use it
# everywhere for consistency (and possibly quicker builds).
cflags += [ "-integrated-as" ]
}
if (is_nacl_nonsfi) {
cflags += [ "--pnacl-allow-translate" ]
ldflags += [
"--pnacl-allow-translate",
"--pnacl-allow-native",
"-Wl,--noirt",
"-Wt,--noirt",
"-Wt,--noirtshim",
# The clang driver automatically injects -lpthread when using libc++, but
# the toolchain doesn't have it yet. To get around this, use
# -nodefaultlibs and make each executable target depend on
# "//native_client/src/nonsfi/irt:nacl_sys_private".
"-nodefaultlibs",
]
libs += [
"c++",
"m",
"c",
"pnaclmm",
]
include_dirs = [ "//native_client/src/public/linux_syscalls" ]
}
asmflags = cflags
}
config("compiler_codegen") {
cflags = []
if (is_nacl_irt) {
cflags += [
# A debugger should be able to unwind IRT call frames. This is
# the default behavior on x86-64 and when compiling C++ with
# exceptions enabled; the change is for the benefit of x86-32 C.
# The frame pointer is unnecessary when unwind tables are used.
"-fasynchronous-unwind-tables",
"-fomit-frame-pointer",
]
if (current_cpu == "x86") {
# The x86-32 IRT needs to be callable with an under-aligned
# stack; so we disable SSE instructions, which can fault on
# misaligned addresses. See
# https://code.google.com/p/nativeclient/issues/detail?id=3935
cflags += [
"-mstackrealign",
"-mno-sse",
]
}
}
asmflags = cflags
}
config("irt_optimize") {
cflags = [
# Optimize for space, keep the IRT nexe small.
"-Os",
# These are omitted from non-IRT libraries to keep the libraries
# themselves small.
"-ffunction-sections",
"-fdata-sections",
]
ldflags = [ "-Wl,--gc-sections" ]
}
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