1# Copyright (c) 2014 The Native Client 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
5import("//build/config/nacl/config.gni")
6
7# Native Client Definitions
8config("nacl_defines") {
9  if (is_linux || is_chromeos || is_android || is_nacl) {
10    defines = [
11      "_POSIX_C_SOURCE=199506",
12      "_XOPEN_SOURCE=600",
13      "_GNU_SOURCE=1",
14      "__STDC_LIMIT_MACROS=1",
15    ]
16  } else if (is_win) {
17    defines = [ "__STDC_LIMIT_MACROS=1" ]
18  }
19
20  if (current_cpu == "pnacl" && !is_nacl_nonsfi) {
21    # TODO: Remove the following definition once NACL_BUILD_ARCH and
22    # NACL_BUILD_SUBARCH are defined by the PNaCl toolchain.
23    defines += [ "NACL_BUILD_ARCH=pnacl" ]
24  }
25}
26
27config("nexe_defines") {
28  defines = [
29    "DYNAMIC_ANNOTATIONS_ENABLED=1",
30    "DYNAMIC_ANNOTATIONS_PREFIX=NACL_",
31  ]
32}
33
34config("nacl_warnings") {
35  if (is_win) {
36    # Some NaCl code uses forward declarations of static const variables,
37    # with initialized definitions later on.  (The alternative would be
38    # many, many more forward declarations of everything used in that
39    # const variable's initializer before the definition.)  The Windows
40    # compiler is too stupid to notice that there is an initializer later
41    # in the file, and warns about the forward declaration.
42    cflags = [ "/wd4132" ]
43  }
44}
45
46# The base target that all targets in the NaCl build should depend on.
47# This allows configs to be modified for everything in the NaCl build, even when
48# the NaCl build is composed into the Chrome build.  (GN has no functionality to
49# add flags to everything in //native_client, having a base target works around
50# that limitation.)
51source_set("nacl_base") {
52  public_configs = [
53    ":nacl_defines",
54    ":nacl_warnings",
55  ]
56  if (current_os == "nacl") {
57    public_configs += [ ":nexe_defines" ]
58  }
59}
60
61config("compiler") {
62  configs = []
63  cflags = []
64  ldflags = []
65  libs = []
66
67  if (is_clang && current_cpu != "pnacl") {
68    # -no-integrated-as is the default in nacl-clang for historical
69    # compatibility with inline assembly code and so forth.  But there
70    # are no such cases in Chromium code, and -integrated-as is nicer in
71    # general.  Moreover, the IRT must be built using LLVM's assembler
72    # on x86-64 to preserve sandbox base address hiding.  Use it
73    # everywhere for consistency (and possibly quicker builds).
74    cflags += [ "-integrated-as" ]
75  }
76  if (is_nacl_nonsfi) {
77    cflags += [ "--pnacl-allow-translate" ]
78    ldflags += [
79      "--pnacl-allow-translate",
80      "--pnacl-allow-native",
81      "-Wl,--noirt",
82      "-Wt,--noirt",
83      "-Wt,--noirtshim",
84
85      # The clang driver automatically injects -lpthread when using libc++, but
86      # the toolchain doesn't have it yet.  To get around this, use
87      # -nodefaultlibs and make each executable target depend on
88      # "//native_client/src/nonsfi/irt:nacl_sys_private".
89      "-nodefaultlibs",
90    ]
91    libs += [
92      "c++",
93      "m",
94      "c",
95      "pnaclmm",
96    ]
97    include_dirs = [ "//native_client/src/public/linux_syscalls" ]
98  }
99
100  asmflags = cflags
101}
102
103config("compiler_codegen") {
104  cflags = []
105
106  if (is_nacl_irt) {
107    cflags += [
108      # A debugger should be able to unwind IRT call frames.  This is
109      # the default behavior on x86-64 and when compiling C++ with
110      # exceptions enabled; the change is for the benefit of x86-32 C.
111      # The frame pointer is unnecessary when unwind tables are used.
112      "-fasynchronous-unwind-tables",
113      "-fomit-frame-pointer",
114    ]
115
116    if (current_cpu == "x86") {
117      # The x86-32 IRT needs to be callable with an under-aligned
118      # stack; so we disable SSE instructions, which can fault on
119      # misaligned addresses.  See
120      # https://code.google.com/p/nativeclient/issues/detail?id=3935
121      cflags += [
122        "-mstackrealign",
123        "-mno-sse",
124      ]
125    }
126  }
127
128  asmflags = cflags
129}
130
131config("irt_optimize") {
132  cflags = [
133    # Optimize for space, keep the IRT nexe small.
134    "-Os",
135
136    # These are omitted from non-IRT libraries to keep the libraries
137    # themselves small.
138    "-ffunction-sections",
139    "-fdata-sections",
140  ]
141
142  ldflags = [ "-Wl,--gc-sections" ]
143}
144