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# Copyright (c) 2012 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.
{
'includes': [
'../../../../build/common.gypi',
],
'conditions': [
['target_arch=="x64"', {
'variables': {
# No extra reservation.
'nacl_reserve_top': '0x0',
}
}],
['target_arch=="ia32"', {
'variables': {
# 1G address space.
'nacl_reserve_top': '0x40000000',
}
}],
['target_arch=="arm"', {
'variables': {
# 1G address space, plus 8K guard area above.
'nacl_reserve_top': '0x40002000',
}
}],
],
'targets': [
{
'target_name': 'nacl_bootstrap_munge_phdr',
'type': 'executable',
'toolsets': ['host'],
'sources': [
'nacl_bootstrap_munge_phdr.c',
],
'libraries': [
'-lelf',
],
# This is an ugly kludge because gyp doesn't actually treat
# host_arch=x64 target_arch=ia32 as proper cross compilation.
# It still wants to compile the "host" program with -m32 et
# al. Though a program built that way can indeed run on the
# x86-64 host, we cannot reliably build this program on such a
# host because Ubuntu does not provide the full suite of
# x86-32 libraries in packages that can be installed on an
# x86-64 host; in particular, libelf is missing. So here we
# use the hack of eliding all the -m* flags from the
# compilation lines, getting the command close to what they
# would be if gyp were to really build properly for the host.
# TODO(bradnelson): Clean up with proper cross support.
'cflags/': [['exclude', '-m.*'],
['exclude', '--sysroot=.*']],
'ldflags/': [['exclude', '-m.*'],
['exclude', '--sysroot=.*']],
},
{
'target_name': 'nacl_bootstrap_lib',
'type': 'static_library',
'product_dir': '<(SHARED_INTERMEDIATE_DIR)/nacl_bootstrap',
'hard_depencency': 1,
'include_dirs': [
'..',
],
'sources': [
'nacl_bootstrap.c',
],
'cflags': [
# Prevent llvm-opt from replacing my_bzero with a call
# to memset.
'-fno-builtin',
# The tiny standalone bootstrap program is incompatible with
# -fstack-protector, which might be on by default. That switch
# requires using the standard libc startup code, which we do not.
'-fno-stack-protector',
# We don't want to compile it PIC (or its cousin PIE), because
# it goes at an absolute address anyway, and because any kind
# of PIC complicates life for the x86-32 assembly code. We
# append -fno-* flags here instead of using a 'cflags!' stanza
# to remove -f* flags, just in case some system's compiler
# defaults to using PIC for everything.
'-fno-pic', '-fno-PIC',
'-fno-pie', '-fno-PIE',
],
'cflags!': [
'-fsanitize=address',
'-w',
# We filter these out because release_extra_cflags or another
# such thing might be adding them in, and those options wind up
# coming after the -fno-stack-protector we added above.
'-fstack-protector',
'-fstack-protector-all',
'-fprofile-generate',
'-finstrument-functions',
'-funwind-tables',
],
'conditions': [
['clang==1', {
'cflags': [
# TODO(bbudge) Remove this when Clang supports -fno-pic.
'-Qunused-arguments',
],
}],
],
},
{
'target_name': 'nacl_bootstrap_raw',
'type': 'none',
# This magical flag tells Gyp that the dependencies of this target
# are nobody else's business and it should not propagate them up
# to things that list this as a dependency. Without this, it will
# wind up adding the nacl_bootstrap_lib static library into the
# link of sel_ldr or chrome just because one executable depends on
# the other.
# TODO(mcgrathr): Maybe one day Gyp will grow a proper target type
# for the use we really want here: custom commands for linking an
# executable, and no peeking inside this target just because you
# depend on it. Then we could stop using this utterly arcane flag
# in favor of something vaguely self-explanatory.
# See http://code.google.com/p/gyp/issues/detail?id=239 for the
# history of the arcana.
'dependencies_traverse': 0,
'dependencies': [
'nacl_bootstrap_lib',
],
'actions': [
{
'action_name': 'link_with_ld_bfd',
'variables': {
'bootstrap_lib': '<(SHARED_INTERMEDIATE_DIR)/nacl_bootstrap/<(STATIC_LIB_PREFIX)nacl_bootstrap_lib<(STATIC_LIB_SUFFIX)',
'linker_script': 'nacl_bootstrap.x',
},
'inputs': [
'<(linker_script)',
'<(bootstrap_lib)',
'ld_bfd.py',
],
'outputs': [
'<(PRODUCT_DIR)/nacl_bootstrap_raw',
],
'message': 'Linking nacl_bootstrap_raw',
'conditions': [
['target_arch=="x64"', {
'variables': {
'linker_emulation': 'elf_x86_64',
}
}],
['target_arch=="ia32"', {
'variables': {
'linker_emulation': 'elf_i386',
}
}],
['target_arch=="arm"', {
'variables': {
'linker_emulation': 'armelf_linux_eabi',
}
}],
],
'action': ['python', 'ld_bfd.py',
# ld_bfd.py needs to know the target compiler used for the
# build but the $CXX environment variable might only be
# set at gyp time. This is a hacky way to bake the correct
# CXX into the build at gyp time.
# TODO(sbc): Do this better by providing some gyp syntax
# for accessing the name of the configured compiler, or
# even a better way to access gyp time environment
# variables from within a gyp file.
'--compiler', '<!(echo ${CXX:=g++})',
'-m', '<(linker_emulation)',
'--build-id',
# This program is (almost) entirely
# standalone. It has its own startup code, so
# no crt1.o for it. It is statically linked,
# and on x86 it does not use libc at all.
# However, on ARM it needs a few (safe) things
# from libc.
'-static',
# Link with custom linker script for special
# layout. The script uses the symbol RESERVE_TOP.
'--defsym', 'RESERVE_TOP=<(nacl_reserve_top)',
'--script=<(linker_script)',
'-o', '<@(_outputs)',
# On x86-64, the default page size with some
# linkers is 2M rather than the real Linux page
# size of 4K. A larger page size is incompatible
# with our custom linker script's special layout.
'-z', 'max-page-size=0x1000',
'--whole-archive', '<(bootstrap_lib)',
'--no-whole-archive',
],
}
],
},
{
'target_name': 'nacl_helper_bootstrap',
'dependencies': [
'nacl_bootstrap_raw',
'nacl_bootstrap_munge_phdr#host',
],
'type': 'none',
# See above about this magical flag.
# It's actually redundant in practice to have it here as well.
# But it expresses the intent: that anything that depends on
# this target has no interest in what goes into building it.
'dependencies_traverse': 0,
'actions': [{
'action_name': 'munge_phdr',
'inputs': ['nacl_bootstrap_munge_phdr.py',
'<(PRODUCT_DIR)/nacl_bootstrap_munge_phdr',
'<(PRODUCT_DIR)/nacl_bootstrap_raw'],
'outputs': ['<(PRODUCT_DIR)/nacl_helper_bootstrap'],
'message': 'Munging ELF program header',
'action': ['python', '<@(_inputs)', '<@(_outputs)']
}],
},
],
}
|
