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meson.build
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#
# SPDX-License-Identifier: BSD-3-Clause
#
# Copyright © 2019-2021 Keith Packard
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
#
project('picolibc', 'c',
default_options: [
'buildtype=minsize',
'debug=true',
'c_std=c18',
'b_staticpic=false',
'warning_level=2',
],
license : 'BSD',
meson_version : '>= 0.53',
version: '1.8.9'
)
fs = import('fs')
cc = meson.get_compiler('c')
# Find the compiler installation directory by parsing the output of
# cc -print-search-dirs
cc_install_dir = ''
foreach _line : run_command(cc.cmd_array() + ['-print-search-dirs'], check : false).stdout().split('\n')
if _line.startswith('install: ')
if meson.version().version_compare('>=0.56')
# trim off the leading 'install: '
cc_install_dir = _line.substring(9)
else
cc_install_dir = run_command(['expr', _line, ':', 'install: *\(.*\)'], check : false).stdout().split('\n')[0]
endif
endif
endforeach
# these options are required for all C compiler operations, including
# detecting many C compiler features, as we cannot expect there
# to be a working C library on the system.
core_c_args = []
if not get_option('use-stdlib')
core_c_args += cc.get_supported_arguments(['-nostdlib'])
endif
# Find the picolibc name for the host cpu. Provide
# for some common aliases
cpu_family_aliases = {
# aarch64
'arm64' : 'aarch64',
# cris
'crisv32' : 'cris',
# loongarch
'loongarch64' : 'loongarch',
'loongarch32' : 'loongarch',
# m68hc11
'm6811' : 'm68hc11',
'm6812' : 'm68hc11',
'm68hc12' : 'm68hc11',
# m68k
'fido' : 'm68k',
# m88k
'm88110' : 'm88k',
# Microblaze
'microblazeel' : 'microblaze',
# mips
'mips64' : 'mips',
# or1k
'or1knd': 'or1k',
# powerpc
'powerpc64' : 'powerpc',
'ppc64' : 'powerpc',
'ppc64le' : 'powerpc',
# riscv
'riscv32' : 'riscv',
'riscv64' : 'riscv',
# sparc
'sparc64' : 'sparc',
# x86
'amd64' : 'x86',
'i486' : 'x86',
'i586' : 'x86',
'i686' : 'x86',
'x86_64' : 'x86',
}
# Check for an alias, default to provided name
host_cpu_family = cpu_family_aliases.get(host_machine.cpu_family(), host_machine.cpu_family())
# Make sure we have meson build support for the machine-specific files
if not fs.is_file('newlib/libc/machine' / host_cpu_family / 'meson.build')
message = '''
Unsupported architecture: "@0@"
Read the Supported Architectures section in README.md
to learn how to add a new architecture.
'''
error(message.format(host_cpu_family))
endif
enable_multilib = get_option('multilib')
multilib_list = get_option('multilib-list')
multilib_exclude = get_option('multilib-exclude')
enable_picolib = get_option('picolib')
enable_picocrt = get_option('picocrt')
enable_picocrt_lib = get_option('picocrt-lib')
picocrt_enable_mmu = get_option('picocrt-enable-mmu')
test_machine = get_option('test-machine')
enable_semihost = get_option('semihost')
enable_tests = get_option('tests')
if get_option('tests-cdefs') == 'auto'
enable_cdefs_tests = enable_tests
else
enable_cdefs_tests = get_option('tests-cdefs') == 'true'
endif
enable_native_tests = get_option('native-tests')
enable_native_math_tests = enable_native_tests and get_option('native-math-tests')
tests_enable_stack_protector = get_option('tests-enable-stack-protector')
tests_enable_full_malloc_stress = get_option('tests-enable-full-malloc-stress')
tests_enable_posix_io = get_option('tests-enable-posix-io')
# C++ is only used in tests, so only check for it when tests are enabled
if enable_tests
have_cplusplus = add_languages('cpp', required: false)
if have_cplusplus
cpp = meson.get_compiler('cpp')
endif
else
have_cplusplus = false
endif
newlib_atexit_dynamic_alloc = get_option('newlib-atexit-dynamic-alloc')
newlib_nano_malloc = get_option('newlib-nano-malloc')
nano_malloc_clear_freed = get_option('nano-malloc-clear-freed')
newlib_elix_level = get_option('newlib-elix-level')
c_args = core_c_args
native_common_args = ['-DNO_NEWLIB']
if get_option('profile')
c_args += ['-pg', '-no-pie']
endif
if get_option('freestanding')
c_args += ['-ffreestanding']
endif
if have_cplusplus
cpp_args = c_args
cpp_flags = cpp.get_supported_arguments(['-fno-common', '-frounding-math', '-fsignaling-nans',
'-Wno-unsupported-floating-point-opt',
'-fno-builtin-copysignl'])
cpp_args += cpp_flags
native_cpp_args = native_common_args + cpp_flags
endif
# Disable ssp and fortify source while building picolibc (it's enabled
# by default by the ubuntu native compiler)
c_flags = cc.get_supported_arguments(['-fno-common', '-frounding-math', '-fsignaling-nans',
'-Wno-unsupported-floating-point-opt',
'-fno-builtin-copysignl'])
c_args += c_flags
native_c_args = native_common_args + c_flags
sanitize_flag = get_option('b_sanitize')
if sanitize_flag == 'none'
sanitize_flag = ''
endif
if get_option('sanitize-bounds')
sanitize_flag = ','.join(sanitize_flag, 'bounds')
endif
sanitize_trap_on_error = get_option('sanitize-trap-on-error')
if sanitize_flag == ''
c_sanitize_flags = []
else
c_sanitize_flags = cc.get_supported_arguments('-fsanitize=' + sanitize_flag)
if c_sanitize_flags == [] and not get_option('sanitize-allow-missing')
error('not supported: -fsanitize=' + sanitize_flag)
endif
if sanitize_trap_on_error
c_sanitize_flags += cc.get_supported_arguments(['-fsanitize-undefined-trap-on-error'])
endif
c_args += c_sanitize_flags
native_c_args += c_sanitize_flags
endif
if cc.symbols_have_underscore_prefix()
global_prefix = '_'
else
global_prefix = ''
endif
fast_strcmp = get_option('fast-strcmp')
mb_capable = get_option('mb-capable')
mb_extended_charsets = mb_capable and get_option('mb-extended-charsets')
if get_option('mb-ucs-charsets') == 'auto'
mb_ucs_charsets = mb_extended_charsets
else
mb_ucs_charsets = mb_capable and get_option('mb-ucs-charsets') == 'true'
endif
if get_option('mb-iso-charsets') == 'auto'
mb_iso_charsets = mb_extended_charsets
else
mb_iso_charsets = mb_capable and get_option('mb-iso-charsets') == 'true'
endif
if get_option('mb-windows-charsets') == 'auto'
mb_windows_charsets = mb_extended_charsets
else
mb_windows_charsets = mb_capable and get_option('mb-windows-charsets') == 'true'
endif
if get_option('mb-jis-charsets') == 'auto'
mb_jis_charsets = mb_extended_charsets
else
mb_jis_charsets = mb_capable and get_option('mb-jis-charsets') == 'true'
endif
newlib_obsolete_math = get_option('newlib-obsolete-math')
newlib_obsolete_math_float = get_option('newlib-obsolete-math-float')
newlib_obsolete_math_double = get_option('newlib-obsolete-math-double')
sysroot_install = get_option('sysroot-install')
system_libc = get_option('system-libc')
prefix = get_option('prefix')
nm = find_program('nm', required : false)
check_duplicate_names = nm.found()
if nm.found()
duplicate_names = find_program('scripts/duplicate-names', required : true)
endif
if enable_cdefs_tests
validate_cdefs = find_program ('scripts/validate-cdefs', required : true)
endif
# Select exit code
picoexit = get_option('picoexit')
# Shared stdio options
io_long_long = get_option('io-long-long')
io_c99_formats = get_option('io-c99-formats')
io_pos_args = get_option('io-pos-args')
io_long_double = get_option('io-long-double')
# Select stdio implementation
tinystdio = get_option('tinystdio')
has_link_defsym = meson.get_cross_property('has_link_defsym',
cc.has_link_argument('-Wl,--defsym=' + 'start=0') or
cc.has_link_argument('-Wl,--defsym=' + '_start=0') or
cc.has_link_argument('-Wl,--defsym=' + '__start=0') or
cc.has_link_argument('-Wl,--defsym=' + '___start=0') )
has_link_alias = meson.get_cross_property('has_link_alias', cc.has_link_argument('-Wl,-alias,' + global_prefix + 'main,testalias'))
lib_gcc = meson.get_cross_property('libgcc', '-lgcc')
stack_symbol = meson.get_cross_property('stack_symbol', '__stack')
# tinystdio options
posix_console = tinystdio and get_option('posix-console')
io_float_exact = not tinystdio or get_option('io-float-exact')
atomic_ungetc = tinystdio and get_option('atomic-ungetc')
_line = get_option('format-default')
# Pick off just the leading character
if meson.version().version_compare('>=0.56')
format_default = _line.substring(0, 1)
else
format_default = run_command(['expr', 'substr', _line, '1', '1'], check : false).stdout().split('\n')[0]
endif
printf_aliases = get_option('printf-aliases')
io_percent_b = tinystdio and get_option('io-percent-b')
printf_small_ultoa = tinystdio and get_option('printf-small-ultoa')
printf_percent_n = tinystdio and get_option('printf-percent-n')
minimal_io_long_long = tinystdio and get_option('minimal-io-long-long')
fast_bufio = tinystdio and get_option('fast-bufio')
io_wchar = tinystdio and get_option('io-wchar')
stdio_locking = tinystdio and get_option('stdio-locking') and not get_option('single-thread')
foreach format : ['d', 'f', 'l', 'i', 'm']
compile_variable = 'printf_compile_args_@0@'.format(format)
if tinystdio and printf_aliases
compile_value = ['-D_PICOLIBC_PRINTF=\'@0@\''.format(format),
'-D_PICOLIBC_SCANF=\'@0@\''.format(format)]
else
compile_value = []
endif
set_variable(compile_variable, compile_value)
link_variable = 'printf_link_args_@0@'.format(format)
link_value = compile_value
if tinystdio and printf_aliases
if format_default != format
if has_link_defsym
link_value += '-Wl,--defsym=@0@vfprintf=@0@__@1@_vfprintf'.format(global_prefix, format)
link_value += '-Wl,--defsym=@0@vfscanf=@0@__@1@_vfscanf'.format(global_prefix, format)
else
link_value += '-Wl,-alias,@0@__@1@_vfprintf,@0@vfprintf'.format(global_prefix, format)
link_value += '-Wl,-alias,@0@__@1@_vfscanf,@0@vfscanf'.format(global_prefix, format)
endif
endif
endif
set_variable(link_variable, link_value)
endforeach
if tinystdio and enable_tests and not (has_link_defsym or has_link_alias)
# If the alias flag is not supported and we are building tests, emit an
# error here to avoid surprising test failures.
error('Symbol alias linker flag not supported - printf tests will fail!')
endif
# A bunch of newlib-stdio only options
newlib_fvwrite_in_streamio = get_option('newlib-fvwrite-in-streamio')
newlib_fseek_optimization = get_option('newlib-fseek-optimization')
newlib_nano_formatted_io = get_option('newlib-nano-formatted-io')
newlib_io_float = get_option('newlib-io-float')
newlib_stdio64 = get_option('newlib-stdio64')
newlib_wide_orient = get_option('newlib-wide-orient')
newlib_have_fcntl = get_option('newlib-have-fcntl')
# Check for a bunch of newlib-stdio only options and complain
# if they are selected while using tinystdio
if tinystdio
if newlib_io_float
error('tinystdio uses a run-time mechanism to select floating point io (newlib-io-float)')
endif
if newlib_fvwrite_in_streamio
error('tinystdio has no fvwrite support (newlib-fvwrite-in-streamio)')
endif
if newlib_fseek_optimization
error('tinystdio has no fseek support (newlib-fseek-optimization)')
endif
if newlib_nano_formatted_io
error('tinystdio uses a run-time mechanism to select smaller printf code (newlib-nano-formatted-io)')
endif
if newlib_wide_orient
error('tinystdio does not support the wide-orient option (newlib-wide-orient)')
endif
else
if posix_console
error('newlib stdio does not support the posix-console option (posix-console)')
endif
if io_pos_args
error('newlib stdio has bugs with positional arguments (io-pos-args)')
endif
endif
if host_cpu_family == ''
host_cc_machine=run_command(cc.cmd_array() + ['-dumpmachine'], check : true).stdout().strip().split('-')
host_cpu_family=host_cc_machine[0]
message('Computed host_cpu_family as ' + host_cpu_family)
endif
tls_model_spec = ''
thread_local_storage = false
thread_local_storage_option = get_option('thread-local-storage')
have_picolibc_tls_api = enable_picolib and fs.is_file('newlib/libc/picolib/machine' / host_cpu_family / 'tls.c')
if thread_local_storage_option == 'auto' or thread_local_storage_option == 'picolibc'
# We assume that _set_tls() is defined in the arch specific tls.c
if thread_local_storage_option == 'auto' or have_picolibc_tls_api
thread_local_storage = not cc.has_function('__emutls_get_address', args: core_c_args + [lib_gcc])
endif
else
thread_local_storage = get_option('thread-local-storage') == 'true'
endif
if thread_local_storage
tls_model_spec = '%{!ftls-model:-ftls-model=' + get_option('tls-model') + '}'
endif
stack_guard_spec = ''
stack_guard_option = get_option('stack-protector-guard')
prefer_tls_stack_guard = false
if stack_guard_option == 'tls'
prefer_tls_stack_guard = true
else
if stack_guard_option == 'auto' and host_cpu_family == 'powerpc'
prefer_tls_stack_guard = true
endif
endif
have_tls_stack_guard = fs.is_file('newlib/libc/machine' / host_cpu_family / 'machine/_ssp_tls.h')
if have_tls_stack_guard
c_stack_guard_tls_flags = cc.get_supported_arguments(['-mstack-protector-guard=tls'])
if c_stack_guard_tls_flags == []
have_tls_stack_guard = false
endif
endif
tls_stack_guard = prefer_tls_stack_guard and have_tls_stack_guard
if tls_stack_guard
stack_guard_spec = '%{!mstack-protector-guard:-mstack-protector-guard=tls}'
c_args += c_stack_guard_tls_flags
else
if stack_guard_option == 'tls'
if not thread_local_storage
error('stack-protector-guard=tls option selected, but thread local storage disabled')
else
error('stack-protector-guard=tls option selected, but not supported for this CPU')
endif
endif
c_stack_guard_global_flags = cc.get_supported_arguments(['-mstack-protector-guard=global'])
if c_stack_guard_global_flags != []
stack_guard_spec = '%{!mstack-protector-guard:-mstack-protector-guard=global}'
c_args += c_stack_guard_global_flags
endif
endif
if sysroot_install
# Get 'sysroot' or 'GCC_EXEC_PREFIX' from GCC output
sysroot = run_command(cc.cmd_array() + ['-print-sysroot'], check : true).stdout().split('\n')[0]
if sysroot != ''
specs_prefix_format_format = '%R/@0@'
specs_prefix_format_default = '%R/@0@'
else
if not get_option('sysroot-install-skip-checks')
error('sysroot install requested, but compiler has no sysroot')
endif
# The default value of GCC_EXEC_PREFIX is "prefix/lib/gcc/"
# Since toolchain may be moved and to another directory, let's get actual path using "gcc -print-search-dirs"
# Note that the "install path" obtained with this command points to the "$GCC_EXEC_PREFIX/$ARCH/$GCC-VERSION"
# That's why obtained path appended with '../../'
sysroot = run_command(cc.cmd_array() + ['-print-search-dirs'], check : true).stdout().split('\n')[0].split(' ')[1]
sysroot += '../../'
specs_prefix_format_format = '%:getenv(GCC_EXEC_PREFIX @0@)'
specs_prefix_format_default = '%:getenv(GCC_EXEC_PREFIX ../../@0@)'
endif
# Try to calculate relative path from sysroot to prefix
specs_prefix_format = ''
if fs.exists(sysroot)
sysroot_to_prefix_correction = ''
foreach _ : sysroot.split('/')
if fs.is_samepath(sysroot + '/' + sysroot_to_prefix_correction, prefix)
specs_prefix_format = specs_prefix_format_format.format(sysroot_to_prefix_correction + '@0@')
break
endif
sysroot_to_prefix_correction += '../'
endforeach
endif
# Use default 'specs_prefix_format' if can not have relative sysroot path
if specs_prefix_format == ''
if not get_option('sysroot-install-skip-checks')
error('sysroot install requires sysroot(' + sysroot + ') to be a subdirectory of --prefix=<PATH>(' + prefix + ')')
endif
specs_prefix_format = specs_prefix_format_default
endif
else
specs_prefix_format = prefix + '/@0@'
endif
build_type_subdir = get_option('build-type-subdir')
lib_dir = prefix / get_option('libdir') / build_type_subdir
include_dir = prefix / get_option('includedir') / build_type_subdir
specs_dir_option = get_option('specsdir')
if build_type_subdir != ''
specs_dir = ''
specs_install = false
elif specs_dir_option == ''
specs_dir = cc_install_dir
specs_install = specs_dir != ''
elif specs_dir_option == 'none'
specs_dir = ''
specs_install = false
else
specs_dir = join_paths(prefix, specs_dir_option)
specs_install = true
endif
# Let targets add more support libraries
additional_libs_list = meson.get_cross_property('additional_libs', [])
compiler_id = cc.get_id()
if compiler_id == 'ccomp'
# When passing the specs file to CompCert, the libcompcert needs to be included there as well
additional_libs_list += '-lcompcert'
endif
additional_libs = ' '.join(additional_libs_list)
if compiler_id == 'gcc' and target_machine.cpu_family() == 'msp430'
# Extract -mhwmult-selection-snippet from GCC.
dumped_specs = run_command(cc.cmd_array() + '-dumpspecs').stdout()
hwmult_start = dumped_specs.split('%{mhwmult=auto')[1]
hwmult_snippet = '%{mhwmult=auto' + hwmult_start.split('-lc')[0]
additional_libs += hwmult_snippet
endif
specs_extra = ''
specs_extra_list = meson.get_cross_property('specs_extra', [])
if specs_extra_list != []
specs_extra = '\n' + '\n'.join(specs_extra_list)
endif
# Handle old-style printf/scanf selection mechanism in the specs file
specs_printf = ''
if tinystdio and printf_aliases
specs_printf=('%{DPICOLIBC_DOUBLE_PRINTF_SCANF:--defsym=vfprintf=@0@__d_vfprintf}' +
' %{DPICOLIBC_DOUBLE_PRINTF_SCANF:--defsym=vfscanf=@0@__d_vfscanf}' +
' %{DPICOLIBC_FLOAT_PRINTF_SCANF:--defsym=vfprintf=@0@__f_vfprintf}' +
' %{DPICOLIBC_FLOAT_PRINTF_SCANF:--defsym=vfscanf=@0@__f_vfscanf}' +
' %{DPICOLIBC_LONG_LONG_PRINTF_SCANF:--defsym=vfprintf=@0@__l_vfprintf}' +
' %{DPICOLIBC_LONG_LONG_PRINTF_SCANF:--defsym=vfscanf=@0@__l_vfscanf}' +
' %{DPICOLIBC_INTEGER_PRINTF_SCANF:--defsym=vfprintf=@0@__i_vfprintf}' +
' %{DPICOLIBC_INTEGER_PRINTF_SCANF:--defsym=vfscanf=@0@__i_vfscanf}' +
' %{DPICOLIBC_MINIMAL_PRINTF_SCANF:--defsym=vfprintf=@0@__m_vfprintf}' +
' %{DPICOLIBC_MINIMAL_PRINTF_SCANF:--defsym=vfscanf=@0@__m_vfscanf}').format(global_prefix)
endif
crt0_expr = '%{-crt0=*:crt0-%*%O%s; :crt0%O%s}'
if system_libc
specs_isystem = ''
specs_libpath = ''
specs_startfile = crt0_expr
else
#
# Construct path values for specs file
#
# Each of these needs to handle --picolibc-prefix and
# --picolibc-buildtype options, system-root vs absolute paths and
# multilib stuff. That makes this all unreasonably complicated.
#
# Each option is computed in three parts, the 'prefix' value
# (corresponding to --picolibc-prefix), the 'buildtype' value
# (corresponding to --picolibc-buildtype) and the 'gen' value (for
# when neither of these options is specifed).
#
# Because 'getenv' appends a space afterwards in GCC spec files, the
# entire final path elements must be specified inside the parens;
# e.g. %:getenv(FOO a/b/c) instead of %:getenv(FOO)/a/b/c. That means
# we use the specs_prefix_format value computed above to build paths
# instead of simple concatenation
#
#
# How to format each of the three option-selected
# values
#
picolibc_prefix_format = '-picolibc-prefix=*:@0@'
picolibc_buildtype_format = '-picolibc-buildtype=*:@0@'
gen_format = '@0@'
#
# How to glue the three options together
#
specs_option_format = '%{@0@; @1@; :@2@}'
#
# Build the -isystem value
#
prefix_include_dir = '%*/@0@/'.format(get_option('includedir'))
isystem_prefix = picolibc_prefix_format.format(prefix_include_dir)
buildtype_include_dir = specs_prefix_format.format(get_option('includedir') / '%*')
isystem_buildtype = picolibc_buildtype_format.format(buildtype_include_dir)
gen_include_dir = specs_prefix_format.format(get_option('includedir'))
isystem_gen = gen_format.format(gen_include_dir)
specs_isystem = '-isystem ' + specs_option_format.format(isystem_prefix, isystem_buildtype, isystem_gen)
#
# Build the non-multilib -L value
#
prefix_lib_dir = '%*/@0@'.format(get_option('libdir'))
lib_prefix = picolibc_prefix_format.format(prefix_lib_dir)
buildtype_lib_dir = specs_prefix_format.format(get_option('libdir') / '%*')
lib_buildtype = picolibc_buildtype_format.format(buildtype_lib_dir)
gen_lib_dir = specs_prefix_format.format(get_option('libdir'))
lib_gen = gen_format.format(gen_lib_dir)
specs_libpath = '-L' + specs_option_format.format(lib_prefix, lib_buildtype, lib_gen)
#
# Build the non-multilib *startfile options
#
prefix_crt0_path = '%*/@0@'.format(get_option('libdir')) / crt0_expr
crt0_prefix = picolibc_prefix_format.format(prefix_crt0_path)
buildtype_crt0_path = specs_prefix_format.format(get_option('libdir') / '%*' / crt0_expr)
crt0_buildtype = picolibc_buildtype_format.format(buildtype_crt0_path)
gen_crt0_path = specs_prefix_format.format(get_option('libdir') / crt0_expr)
crt0_gen = gen_format.format(gen_crt0_path)
#
# Now build multilib versions of the -L and *startfile values
#
if enable_multilib
#
# Build the multilib -L value
#
prefix_multilib_dir = '%*/@0@'.format(get_option('libdir') / '%M')
multilib_prefix = picolibc_prefix_format.format(prefix_multilib_dir)
buildtype_multilib_dir = specs_prefix_format.format(get_option('libdir') / '%*/%M')
multilib_buildtype = picolibc_buildtype_format.format(buildtype_multilib_dir)
gen_multilib_dir = specs_prefix_format.format(get_option('libdir') / '%M')
multilib_gen = gen_format.format(gen_multilib_dir)
specs_multilibpath = '-L' + specs_option_format.format(multilib_prefix, multilib_buildtype, multilib_gen)
#
# Prepend the multilib -L option to the non-multilib option
#
specs_libpath = specs_multilibpath + ' ' + specs_libpath
#
# Build the multilib *startfile options
#
prefix_multilib_crt0_path = '%*/@0@'.format(get_option('libdir')) / '%M' / crt0_expr
crt0_prefix = picolibc_prefix_format.format(prefix_multilib_crt0_path)
buildtype_multilib_crt0_path = specs_prefix_format.format(get_option('libdir') / '%*/%M' / crt0_expr)
crt0_buildtype = picolibc_buildtype_format.format(buildtype_multilib_crt0_path)
gen_multilib_crt0_path = specs_prefix_format.format(get_option('libdir') / '%M' / crt0_expr)
crt0_gen = gen_format.format(gen_multilib_crt0_path)
endif
#
# Construct the *startfile value from the options computed
# above. As there's only one value, it's either the
# multilib path or the non-multilib path
#
specs_startfile = specs_option_format.format(crt0_prefix, crt0_buildtype, crt0_gen)
endif
specs_data = configuration_data()
specs_data.set('SPECS_ISYSTEM', specs_isystem)
specs_data.set('SPECS_LIBPATH', specs_libpath)
specs_data.set('SPECS_STARTFILE', specs_startfile)
specs_data.set('TLSMODEL', tls_model_spec)
specs_data.set('STACKGUARD', stack_guard_spec)
specs_data.set('LINK_SPEC', meson.get_cross_property('link_spec', ''))
specs_data.set('CC1_SPEC', meson.get_cross_property('cc1_spec', ''))
specs_data.set('CC1PLUS_SPEC', meson.get_cross_property('cc1plus_spec', ''))
specs_data.set('ADDITIONAL_LIBS', additional_libs)
specs_data.set('SPECS_EXTRA', specs_extra)
specs_data.set('SPECS_PRINTF', specs_printf)
# Create C and C++ specific specs data,
# that includes setting the correct linker script
# and adding the C++ startup/shutdown files
specs_c_data = specs_data
specs_c_data.set('PICOLIBC_LD', 'picolibc.ld')
specs_c_data.set('CRTBEGIN', '')
specs_c_data.set('CRTEND', '')
specs_cpp_data = specs_data
specs_cpp_data.set('PICOLIBC_LD', 'picolibcpp.ld')
specs_cpp_data.set('CRTBEGIN', 'crtbegin%O%s')
specs_cpp_data.set('CRTEND', 'crtend%O%s')
picolibc_specs = configure_file(input: 'picolibc.specs.in',
output: 'picolibc.specs',
configuration: specs_c_data,
install_dir: specs_dir,
install: specs_install)
picolibc_specs_name = 'picolibc.specs'
picolibcpp_specs = configure_file(input: 'picolibc.specs.in',
output: 'picolibcpp.specs',
configuration: specs_cpp_data,
install_dir: specs_dir,
install: specs_install)
# Not all compilers necessarily support all warnings; only use these which are:
common_warnings = [
'-Werror=vla',
'-Warray-bounds',
'-Werror=double-promotion',
'-Wno-missing-braces',
'-Wno-return-type',
'-Wno-unused-command-line-argument',
'-Wmissing-prototypes',
'-Wmissing-declarations',
'-Werror=implicit-fallthrough=5',
'-Werror=unreachable-code-fallthrough',
]
if get_option('analyzer')
common_warnings += [
'-fanalyzer',
]
endif
c_warnings = common_warnings + [
'-Werror=implicit-function-declaration',
'-Wold-style-definition',
'-Wno-implicit-int',
]
c_flags = cc.get_supported_arguments(c_warnings)
c_args += c_flags
native_c_args += c_flags
# Make sure _LIBC is not defined when building tests
test_c_args = c_args
c_args += ['-D_LIBC', '-U_FORTIFY_SOURCE']
# Select a fortify source option
fortify_source = get_option('fortify-source')
if fortify_source == 'none'
test_fortify_arg = '-U_FORTIFY_SOURCE'
else
test_fortify_arg = '-D_FORTIFY_SOURCE=' + fortify_source
endif
test_c_args += [test_fortify_arg]
c_args += cc.get_supported_arguments(['-fno-stack-protector'])
if have_cplusplus
cpp_warnings = common_warnings
cpp_flags = cpp.get_supported_arguments(cpp_warnings)
cpp_args += cpp_flags
cpp_flags = cpp.get_supported_arguments(['-fno-exceptions', '-fno-unwind-tables', '-fno-stack-protector'])
cpp_args += cpp_flags
test_cpp_args = cpp_args + [test_fortify_arg]
endif
# CompCert does not support bitfields in packed structs, so avoid using this optimization
bitfields_in_packed_structs_code = '''
struct test { int part: 24; } __attribute__((packed));
unsigned int foobar (const struct test *p) { return p->part; }
'''
have_bitfields_in_packed_structs = cc.compiles(bitfields_in_packed_structs_code, name : 'packed structs may contain bitfields', args: core_c_args)
# CompCert does not have __builtin_mul_overflow
builtin_mul_overflow_code = '''
#include <stddef.h>
int overflows (size_t a, size_t b) { size_t x; return __builtin_mul_overflow(a, b, &x); }
volatile size_t aa = 42;
int main (void) { return overflows(aa, aa); }
'''
have_builtin_mul_overflow = cc.links(builtin_mul_overflow_code, name : 'has __builtin_mul_overflow', args: core_c_args)
# CompCert does not have __builtin_add_overflow
builtin_add_overflow_code = '''
#include <stddef.h>
int overflows (size_t a, size_t b) { size_t x; return __builtin_add_overflow(a, b, &x); }
volatile size_t aa = 42;
int main (void) { return overflows(aa, aa); }
'''
have_builtin_add_overflow = cc.links(builtin_add_overflow_code, name : 'has __builtin_add_overflow', args: core_c_args)
# CompCert does not support _Complex
complex_code = '''
float _Complex test(float _Complex z) { return z; }
'''
have_complex = cc.compiles(complex_code, name : 'supports _Complex', args: core_c_args)
builtin_complex_code = '''
#include <stddef.h>
double _Complex test(double r, double i) { return __builtin_complex(r, i); }
'''
have_builtin_complex = have_complex and cc.compiles(builtin_complex_code, name : 'supports __builtin_complex', args: core_c_args)
# CompCert does not have __builtin_expect
builtin_expect_code = '''
volatile int a = 42;
int main (void) {
return __builtin_expect(a, 1);
}
'''
have_builtin_expect = cc.links(builtin_expect_code, name : 'has __builtin_expect', args: core_c_args)
werror_c_args = core_c_args + cc.get_supported_arguments('-Werror')
# CompCert uses the GCC preprocessor, which causes to
# > #if __has_attribute(__alloc_size__)
# produce a wrong result. So test if the compiler has that attribute
alloc_size_code = '''
void *foobar(int) __attribute__((__alloc_size__(1)));
void *foobar2(int, int) __attribute__((__alloc_size__(1, 2)));
'''
have_alloc_size = cc.compiles(alloc_size_code, name : 'attribute __alloc_size__', args : werror_c_args)
# attributes constructor/destructor are a GNU extension - if the compiler doesn't have them, don't test them.
attr_ctor_dtor_code = '''
void __attribute__((constructor(101))) ctor (void) {}
void __attribute__((destructor(101))) dtor (void) {}
'''
have_attr_ctor_dtor = cc.compiles(attr_ctor_dtor_code, name : 'attributes constructor/destructor', args : werror_c_args)
targets = []
if enable_multilib
used_libs = []
# Ask the compiler for the set of available multilib configurations,
# set up the build system to compile for all desired ones
target_list = run_command(cc.cmd_array() + get_option('c_args') + ['--print-multi-lib'], check : true).stdout().strip().split('\n')
has_mcmodel = false
foreach target : target_list
if target.contains('mcmodel=')
has_mcmodel = true
endif
endforeach
foreach target : target_list
tmp = target.split(';')
matches_exclude = false
foreach exclude : multilib_exclude
if tmp[0].contains(exclude)
matches_exclude = true
message('skipping target ' + tmp[0])
break
endif
endforeach
if matches_exclude
continue
endif
flags = []
# Let the user specify a subset of the possible multilib
# configurations to build for
if multilib_list == [] or tmp[0] in multilib_list
used_libs += tmp[0]
if tmp.length() > 1
foreach flag : tmp[1].strip('@').split('@')
if flag != ''
if host_cpu_family == 'nios2'
# Hacks for NIOS II to get rid of -fsingle-precision-constant
# mode (which breaks libm). We don't need fph2 as that
# doesn't set the single precision constant flag
if flag == 'mcustom-fpu-cfg=60-1'
flags += ['-mcustom-fmuls=252', '-mcustom-fadds=253',
'-mcustom-fsubs=254']
elif flag == 'mcustom-fpu-cfg=60-2'
flags += ['-mcustom-fmuls=252', '-mcustom-fadds=253',
'-mcustom-fsubs=254', '-mcustom-fdivs=255']
elif flag == 'mcustom-fpu-cfg=72-3'
flags += ['-mcustom-floatus=243', '-mcustom-fixsi=244',
'-mcustom-floatis=245','-mcustom-fcmpgts=246',
'-mcustom-fcmples=249', '-mcustom-fcmpeqs=250',
'-mcustom-fcmpnes=251', '-mcustom-fmuls=252',
'-mcustom-fadds=253', '-mcustom-fsubs=254',
'-mcustom-fdivs=255']
else
flags += '-' + flag
endif
else
flags += '-' + flag
endif
endif
endforeach
if tmp[0] == '.'
dir = ''
name = ''
lib_prefix = ''
else
dir = tmp[0]
name = '_' + tmp[0].underscorify()
lib_prefix = 'lib'
endif
else
dir = ''
name = ''
lib_prefix = ''
endif
# rv64 needs to use a non-default mcmodel so that variables can
# live in a broader range of memory addresses
if not has_mcmodel and name.strip('_').startswith('rv64')
flags += [ '-mcmodel=medany' ]
endif
# Add any extra flags for this target from the cross file
flags += meson.get_cross_property('c_args_' + name.strip('_'), [])
targets += {
'name': name,
'dir': dir,
'c_args': flags,
'lib_prefix': lib_prefix,
}
endif
endforeach
# Make sure all requested multilib configurations
# are actually available
if multilib_list != []
foreach lib : multilib_list
if lib not in used_libs
error('Unavailable multilib: ' + lib)
endif
endforeach
endif
else
targets += {
'name': '',
'dir': '',
'c_args': [],
'lib_prefix': '',
}
endif
default_target = {
'name': 'default-target',
'dir': '',
'c_args': [],
'lib_prefix': '',
}
foreach params : [default_target] + targets
target = params['name']
target_dir = params['dir']
target_c_args = params['c_args']
target_lib_prefix = params['lib_prefix']
custom_mem_config = ''
if target != 'default-target'
target_part = ''
foreach part : target.split('_')
if part != ''
target_part += '_' + part
custom_mem_config = meson.get_cross_property('custom_mem_config' + target_part, custom_mem_config)
endif
endforeach
target_head = target_dir.split('_')[0].underscorify()
custom_mem_config = meson.get_cross_property('custom_mem_config_' + target_head, custom_mem_config)
endif
custom_mem_config = meson.get_cross_property('custom_mem_config' + target, custom_mem_config)
if target == 'default-target' or custom_mem_config != ''
picolibc_linker_type_data = configuration_data()
# We need to use different alignment flags for .tdata/.tbss for ld.bfd
# (ALIGN_WITH_INPUT, which is not supported by ld.lld) and ld.lld
# (ALIGN(__tls_align), which is rejected as non-constant by ld.bfd), so we use
# the {BFD,LLD}_{START,END} templates to comment out the incompatible flag.
if cc.get_linker_id() == 'ld.lld'
picolibc_linker_type_data.set('BFD_START', '/* For ld.bfd: ')
picolibc_linker_type_data.set('BFD_END', '*/')
picolibc_linker_type_data.set('LLD_START', '')
picolibc_linker_type_data.set('LLD_END', '')
picolibc_linker_type_data.set('TLS_PHDRS', 'tls PT_TLS;')
picolibc_linker_type_data.set('TLS_INIT_SEG', 'tls')
if host_cpu_family == 'riscv'
# ld.lld before version 15 did not support linker relaxations, disable
# them if we are using an older version.