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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'
)
targets = []
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',
# arc
'arc64' : 'arc',
# cris
'crisv32' : 'cris',
# m68hc11
'm6811' : 'm68hc11',
'm6812' : 'm68hc11',
'm68hc12' : 'm68hc11',
# m68k
'fido' : 'm68k',
# m88k
'm88110' : 'm88k',
# 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
# Find out about float types
long_double_code = '''
#include <float.h>
#ifndef __LDBL_MANT_DIG__
#error No long double support in float.h
#endif
long double test()
{
long double ld = 0.0L;
return ld;
}
'''
have_long_double = cc.compiles(long_double_code, name : 'long double check', args: core_c_args)
have_sizeof_float = cc.get_define('__SIZEOF_FLOAT__') != ''
have_sizeof_double = cc.get_define('__SIZEOF_DOUBLE__') != ''
have_sizeof_long_double = have_long_double and cc.get_define('__SIZEOF_LONG_DOUBLE__') != ''
set_double_equals_float = not have_sizeof_float or not have_sizeof_double
if set_double_equals_float
float_double_code = '''
char size_test[sizeof(float) == sizeof(double) ? 1 : -1];
'''
set_double_equals_float =
double_equals_float = cc.compiles(float_double_code, name : 'double same as float', args : core_c_args)
endif
set_long_double_equals_double = not have_sizeof_double or not have_sizeof_long_double
if set_long_double_equals_double
long_double_size_code = '''
#include <float.h>
char size_test[sizeof(double) == sizeof(long double) ? 1 : -1];
'''
long_double_equals_double = cc.compiles(long_double_size_code, name : 'long double same as double', args: core_c_args)
endif
enable_multilib = get_option('multilib')
multilib_list = get_option('multilib-list')
enable_picolib = get_option('picolib')
enable_picocrt = get_option('picocrt')
enable_semihost = get_option('semihost')
enable_tests = get_option('tests')
enable_native_tests = get_option('native-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')
have_alias_attribute_option = get_option('have-alias-attribute')
have_format_attribute_option = get_option('have-format-attribute')
have_weak_attribute_option = get_option('have-weak-attribute')
newlib_iconv_encodings = get_option('newlib-iconv-encodings')
newlib_iconv_encodings_exclude = get_option('newlib-iconv-encodings-exclude')
newlib_iconv_from_encodings = get_option('newlib-iconv-from-encodings')
newlib_iconv_to_encodings = get_option('newlib-iconv-to-encodings')
newlib_iconv_external_ccs = get_option('newlib-iconv-external-ccs')
newlib_atexit_dynamic_alloc = get_option('newlib-atexit-dynamic-alloc')
newlib_nano_malloc = get_option('newlib-nano-malloc')
lite_exit = get_option('lite-exit')
newlib_elix_level = get_option('newlib-elix-level')
c_args = ['-include', '@0@/@1@'.format(meson.current_build_dir(), 'picolibc.h')] + core_c_args
native_c_args = ['-DNO_NEWLIB']
if get_option('profile')
c_args += ['-pg', '-no-pie']
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-stack-protector',
'-fno-builtin-copysignl'])
c_args += c_flags
native_c_args += c_flags
c_args += '-D_LIBC'
# Select a fortify source option
fortify_source = get_option('fortify-source')
if fortify_source == 'none'
c_args += '-U_FORTIFY_SOURCE'
else
c_args += '-D_FORTIFY_SOURCE=' + fortify_source
endif
if cc.symbols_have_underscore_prefix()
global_prefix = '_'
else
global_prefix = ''
endif
fast_strcmp = get_option('fast-strcmp')
newlib_mb = get_option('newlib-mb')
newlib_locale_info = get_option('newlib-locale-info')
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
# Select exit code
picoexit = get_option('picoexit')
# Shared stdio options
io_long_long = get_option('io-long-long')
newlib_io_long_long = get_option('newlib-io-long-long')
if newlib_io_long_long != 'auto'
io_long_long = newlib_io_long_long == 'true'
endif
io_c99_formats = get_option('io-c99-formats')
newlib_io_c99_formats = get_option('newlib-io-c99-formats')
if newlib_io_c99_formats != 'auto'
io_c99_formats = newlib_io_c99_formats == 'true'
endif
io_pos_args = get_option('io-pos-args')
newlib_io_pos_args = get_option('newlib-io-pos-args')
if newlib_io_pos_args != 'auto'
io_pos_args = newlib_io_pos_args == 'true'
endif
# Select stdio implementation
tinystdio = get_option('tinystdio')
has_link_defsym = meson.get_cross_property('has_link_defsym', cc.has_link_argument('-Wl,--defsym=' + global_prefix + '_start=0'))
has_link_alias = meson.get_cross_property('has_link_alias', cc.has_link_argument('-Wl,-alias,' + global_prefix + 'main,testalias'))
# tinystdio options
posix_io = tinystdio and get_option('posix-io')
posix_console = posix_io and get_option('posix-console')
io_float_exact = not tinystdio or get_option('io-float-exact')
atomic_ungetc = tinystdio and get_option('atomic-ungetc')
format_default = get_option('format-default')
printf_aliases = get_option('printf-aliases')
io_percent_b = tinystdio and get_option('io-percent-b')
io_long_double = get_option('io-long-double') or get_option('newlib-io-long-double')
if printf_aliases
double_printf_compile_args=['-DPICOLIBC_DOUBLE_PRINTF_SCANF']
float_printf_compile_args=['-DPICOLIBC_FLOAT_PRINTF_SCANF']
int_printf_compile_args=['-DPICOLIBC_INTEGER_PRINTF_SCANF']
else
double_printf_compile_args=[]
float_printf_compile_args=[]
int_printf_compile_args=[]
endif
double_printf_link_args=double_printf_compile_args
float_printf_link_args=float_printf_compile_args
int_printf_link_args=int_printf_compile_args
if tinystdio
if format_default == 'double'
c_args += '-DFORMAT_DEFAULT_DOUBLE'
elif format_default == 'float'
c_args += '-DFORMAT_DEFAULT_FLOAT'
elif format_default == 'integer'
c_args += '-DFORMAT_DEFAULT_INTEGER'
endif
endif
if tinystdio and printf_aliases
vfprintf_symbol = global_prefix + 'vfprintf'
__d_vfprintf_symbol = global_prefix + '__d_vfprintf'
__f_vfprintf_symbol = global_prefix + '__f_vfprintf'
__i_vfprintf_symbol = global_prefix + '__i_vfprintf'
vfscanf_symbol = global_prefix + 'vfscanf'
__d_vfscanf_symbol = global_prefix + '__d_vfscanf'
__f_vfscanf_symbol = global_prefix + '__f_vfscanf'
__i_vfscanf_symbol = global_prefix + '__i_vfscanf'
if has_link_defsym
if format_default != 'double'
double_printf_link_args += '-Wl,--defsym=' + vfprintf_symbol + '=' + __d_vfprintf_symbol
double_printf_link_args += '-Wl,--defsym=' + vfscanf_symbol + '=' + __d_vfscanf_symbol
endif
if format_default != 'float'
float_printf_link_args += '-Wl,--defsym=' + vfprintf_symbol + '=' + __f_vfprintf_symbol
float_printf_link_args += '-Wl,--defsym=' + vfscanf_symbol + '=' + __f_vfscanf_symbol
endif
if format_default != 'integer'
int_printf_link_args += '-Wl,--defsym=' + vfprintf_symbol + '=' + __i_vfprintf_symbol
int_printf_link_args += '-Wl,--defsym=' + vfscanf_symbol + '=' + __i_vfscanf_symbol
endif
elif has_link_alias
if format_default == 'double'
float_printf_link_args += '-Wl,-alias,' + vfprintf_symbol + ',' + __d_vfprintf_symbol
float_printf_link_args += '-Wl,-alias,' + vfscanf_symbol + ',' + __d_vfscanf_symbol
int_printf_link_args += '-Wl,-alias,' + vfprintf_symbol + ',' + __d_vfprintf_symbol
int_printf_link_args += '-Wl,-alias,' + vfscanf_symbol + ',' + __d_vfscanf_symbol
endif
if format_default == 'float'
double_printf_link_args += '-Wl,-alias,' + vfprintf_symbol + ',' + __f_vfprintf_symbol
double_printf_link_args += '-Wl,-alias,' + vfscanf_symbol + ',' + __f_vfscanf_symbol
int_printf_link_args += '-Wl,-alias,' + vfprintf_symbol + ',' + __f_vfprintf_symbol
int_printf_link_args += '-Wl,-alias,' + vfscanf_symbol + ',' + __f_vfscanf_symbol
endif
if format_default == 'int'
double_printf_link_args += '-Wl,-alias,' + vfprintf_symbol + ',' + __i_vfprintf_symbol
double_printf_link_args += '-Wl,-alias,' + vfscanf_symbol + ',' + __i_vfscanf_symbol
float_printf_link_args += '-Wl,-alias,' + vfprintf_symbol + ',' + __i_vfprintf_symbol
float_printf_link_args += '-Wl,-alias,' + vfscanf_symbol + ',' + __i_vfscanf_symbol
endif
if format_default != 'double'
double_printf_link_args += '-Wl,-alias,' + __d_vfprintf_symbol + ',' + vfprintf_symbol
double_printf_link_args += '-Wl,-alias,' + __d_vfscanf_symbol + ',' + vfscanf_symbol
endif
if format_default != 'float'
float_printf_link_args += '-Wl,-alias,' + __f_vfprintf_symbol + ',' + vfprintf_symbol
float_printf_link_args += '-Wl,-alias,' + __f_vfscanf_symbol + ',' + vfscanf_symbol
endif
if format_default != 'integer'
int_printf_link_args += '-Wl,-alias,' + __i_vfprintf_symbol + ',' + vfprintf_symbol
int_printf_link_args += '-Wl,-alias,' + __i_vfscanf_symbol + ',' + vfscanf_symbol
endif
else
if enable_tests
# 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
endif
endif
# A bunch of newlib-stdio only options
newlib_global_stdio_streams = get_option('newlib-global-stdio-streams')
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_global_stdio_streams
error('tinystdio always has (reentrant) global stdio streams (newlib-global-stdio-streams)')
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
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
if have_alias_attribute_option == 'auto'
have_alias_attribute = cc.has_function_attribute('alias')
else
have_alias_attribute = have_alias_attribute_option == 'true'
endif
if have_format_attribute_option == 'auto'
have_format_attribute = cc.has_function_attribute('format')
else
have_format_attribute = have_format_attribute_option == 'true'
endif
if have_weak_attribute_option == 'auto'
have_weak_attribute = cc.has_function_attribute('weak')
else
have_weak_attribute = have_weak_attribute_option == 'true'
endif
tls_model_spec = ''
thread_local_storage = false
thread_local_storage_option = get_option('thread-local-storage')
have_picolibc_tls_api = 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 + ['-lgcc'])
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
if sysroot_install
sysroot = run_command(cc.cmd_array() + ['-print-sysroot'], check : true).stdout().split('\n')[0]
if sysroot != ''
specs_prefix_format = '%R/@0@'
else
sysroot = cc_install_dir + '../../../..'
specs_prefix_format = '%:getenv(GCC_EXEC_PREFIX ../../@0@)'
endif
if not get_option('sysroot-install-skip-checks')
if sysroot == ''
error('sysroot install requested, but compiler has no sysroot')
endif
if not fs.is_samepath(sysroot, prefix)
error('sysroot install requires --prefix=' + sysroot)
endif
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
newlib_iconv_dir = get_option('newlib-iconv-dir')
if newlib_iconv_dir == ''
newlib_iconv_dir = join_paths(lib_dir, 'locale')
endif
newlib_iconv_runtime_dir = get_option('newlib-iconv-runtime-dir')
if newlib_iconv_runtime_dir == ''
newlib_iconv_runtime_dir = newlib_iconv_dir
endif
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', [])
if cc.get_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)
specs_extra = ''
specs_extra_list = meson.get_cross_property('specs_extra', [])
if specs_extra_list != []
specs_extra = '\n' + '\n'.join(specs_extra_list)
endif
specs_printf = ''
if tinystdio and printf_aliases
specs_printf=('%{DPICOLIBC_FLOAT_PRINTF_SCANF:--defsym=vfprintf=__f_vfprintf}' +
' %{DPICOLIBC_FLOAT_PRINTF_SCANF:--defsym=vfscanf=__f_vfscanf}' +
' %{DPICOLIBC_DOUBLE_PRINTF_SCANF:--defsym=vfprintf=__d_vfprintf}' +
' %{DPICOLIBC_DOUBLE_PRINTF_SCANF:--defsym=vfscanf=__d_vfscanf}' +
' %{DPICOLIBC_INTEGER_PRINTF_SCANF:--defsym=vfprintf=__i_vfprintf}' +
' %{DPICOLIBC_INTEGER_PRINTF_SCANF:--defsym=vfscanf=__i_vfscanf}')
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('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)
picolibcpp_specs = configure_file(input: 'picolibc.specs.in',
output: 'picolibcpp.specs',
configuration: specs_cpp_data,
install_dir: specs_dir,
install: specs_install)
picolibc_linker_type_data = configuration_data()
if cc.get_linker_id() == 'ld.lld'
# ld.lld does not implement ALIGN_WITH_INPUT, but this flag is not needed
# with ld.lld's output section LMA/VMA algorithm.
# An added ASSERT() statement in the linker script ensures that we don't
# get silent failures in case this changes in the future.
picolibc_linker_type_data.set('LDSCRIPT_ALIGN_WITH_INPUT', '')
if host_cpu_family == 'riscv'
# ld.lld before version 15 did not support linker relaxations, disable
# them if we are using an older version.
# There is no `cc.get_linker_version()` function, so we detect ld.lld
# version 15 by checking for a newly added linker flag.
if not cc.has_link_argument('--package-metadata=1')
message('Linking for RISCV with ld.lld < 15, forcing -mno-relax')
c_args += ['-mno-relax']
endif
endif
else
picolibc_linker_type_data.set('LDSCRIPT_ALIGN_WITH_INPUT', 'ALIGN_WITH_INPUT')
endif
picolibc_linker_type_data.set('DEFAULT_FLASH_ADDR',
meson.get_cross_property('default_flash_addr',
'0x10000000'))
picolibc_linker_type_data.set('DEFAULT_FLASH_SIZE',
meson.get_cross_property('default_flash_size',
'0x00010000'))
picolibc_linker_type_data.set('DEFAULT_RAM_ADDR',
meson.get_cross_property('default_ram_addr',
'0x20000000'))
picolibc_linker_type_data.set('DEFAULT_RAM_SIZE',
meson.get_cross_property('default_ram_size',
'0x00008000'))
picolibc_linker_type_data.set('DEFAULT_STACK_SIZE',
meson.get_cross_property('default_stack_size',
'0x00001000'))
picolibc_ld_data = configuration_data()
picolibc_ld_data.merge_from(picolibc_linker_type_data)
picolibc_ld_data.set('CPP_START', '/*')
picolibc_ld_data.set('CPP_END', '*/')
picolibc_ld_data.set('C_START', '')
picolibc_ld_data.set('C_END', '')
picolibc_ld = configure_file(input: 'picolibc.ld.in',
output: 'picolibc.ld',
configuration: picolibc_ld_data,
install_dir: lib_dir)
picolibcpp_ld_data = configuration_data()
picolibcpp_ld_data.merge_from(picolibc_linker_type_data)
picolibcpp_ld_data.set('CPP_START', '')
picolibcpp_ld_data.set('CPP_END', '')
picolibcpp_ld_data.set('C_START', '/*')
picolibcpp_ld_data.set('C_END', '*/')
picolibcpp_ld = configure_file(input: 'picolibc.ld.in',
output: 'picolibcpp.ld',
configuration: picolibcpp_ld_data,
install_dir: lib_dir)
# Not all compilers necessarily support all warnings; only use these which are:
c_warnings = [
'-Werror=implicit-function-declaration',
'-Werror=vla',
'-Warray-bounds',
'-Wold-style-definition',
'-Werror=double-promotion',
]
disabled_warnings = [
'-Wno-missing-braces',
'-Wno-implicit-int',
'-Wno-return-type',
'-Wno-unused-command-line-argument',
]
c_flags = cc.get_supported_arguments(c_warnings, disabled_warnings)
c_args += c_flags
native_c_args += c_flags
# 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)
# 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)
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() + ['--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
message('target ' + target)
tmp = target.split(';')
flags = c_args
# 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] == '.'
name = ''
else
name = tmp[0].underscorify()
endif
else
name = ''
endif
targets += name
# 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.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, [])
value = [tmp[0], flags]
set_variable('target_' + name, value)
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 = ['']
target_ = ['.', c_args]
endif
conf_data = configuration_data()
# The supported builtins vary depending on compiler and target.
# If you want to check for a given builtin, add an array
# ['some_builtin_name', '__call_to_builtin(1,2,3);']
# The below loop will then add the define HAVE_SOME_BUILTIN_NAME if the code snippet
# > int main (void) { __call_to_builtin(1,2,3); return 0; }
# can be compiled + linked.
# The name should match the builtin, but technically it's not necessary
builtins = [
['builtin_alloca', '__builtin_alloca(1)', 'void *'],
['builtin_ffs', '__builtin_ffs(42)', 'int'],
['builtin_ffsl', '__builtin_ffsl((long)42)', 'long'],
['builtin_ffsll', '__builtin_ffsll((long long)42)', 'long long'],
['builtin_ctz', '__builtin_ctz((unsigned int)42)', 'int'],
['builtin_ctzl', '__builtin_ctzl((unsigned long)42)', 'int'],
['builtin_ctzll', '__builtin_ctzll((unsigned long long)42)', 'int'],
['builtin_copysignl', '__builtin_copysignl((long double)42, (long double) 42)', 'long double'],
['builtin_copysign', '__builtin_copysign(42, 42)', 'double'],
['builtin_isinfl', '__builtin_isinfl((long double)42)', 'int'],
['builtin_isinf', '__builtin_isinf((long double)42)', 'int'],
['builtin_isnanl', '__builtin_isnanl((long double)42)', 'int'],
['builtin_isnan', '__builtin_isnan((long double)42)', 'int'],
['builtin_finitel', '__builtin_finitel((long double)42)', 'int'],
['builtin_isfinite', '__builtin_isfinite((long double)42)', 'int'],
]
foreach builtin : builtins
builtin_template='''
static int foo(@1@ i __attribute__((unused))) { return 0; }
int main(void) { return foo(@0@); }
'''
builtin_code = builtin_template.format(builtin[1], builtin[2])
have_current_builtin = cc.links(builtin_code, name : 'test for __' + builtin[0], args: core_c_args)
conf_data.set('_HAVE_' + builtin[0].to_upper(), have_current_builtin, description: 'The compiler supports __' + builtin[0])
endforeach
NEWLIB_VERSION='4.1.0'
NEWLIB_MAJOR_VERSION=4
NEWLIB_MINOR_VERSION=1
NEWLIB_PATCHLEVEL_VERSION=0
if get_option('newlib-retargetable-locking') != get_option('newlib-multithread')
error('newlib-retargetable-locking and newlib-multithread must be set to the same value')
endif
conf_data.set('_HAVE_CC_INHIBIT_LOOP_TO_LIBCALL',
cc.has_argument('-fno-tree-loop-distribute-patterns'),
description: 'Compiler flag to prevent detecting memcpy/memset patterns')
conf_data.set('_HAVE_NO_BUILTIN_ATTRIBUTE',
cc.compiles('int __attribute__((no_builtin)) foo(int x) { return x + 1; }',
name : 'no_builtin attribute',
args : werror_c_args),
description: 'Compiler attribute to prevent the optimizer from adding new builtin calls')
conf_data.set('_HAVE_LONG_DOUBLE', have_long_double,
description: 'Compiler has long double type')
if set_double_equals_float
conf_data.set('_DBL_EQ_FLT', double_equals_float,
description: 'double is the same as float')
endif
if set_long_double_equals_double
conf_data.set('_LDBL_EQ_DBL', long_double_equals_double,
description: 'long double is the same as double')
endif
conf_data.set('_HAVE_ALIAS_ATTRIBUTE', have_alias_attribute)
conf_data.set('_HAVE_FORMAT_ATTRIBUTE', have_format_attribute)
conf_data.set('_HAVE_WEAK_ATTRIBUTE', have_weak_attribute)
conf_data.set('_WANT_REGISTER_FINI', get_option('newlib-register-fini'))
conf_data.set('_WANT_IO_LONG_LONG', io_long_long)
conf_data.set('_WANT_IO_POS_ARGS', io_pos_args)
conf_data.set('_WANT_IO_C99_FORMATS', io_c99_formats)
conf_data.set('_IO_FLOAT_EXACT', io_float_exact)
conf_data.set('_WANT_IO_PERCENT_B', io_percent_b)
conf_data.set('_WANT_IO_LONG_DOUBLE', io_long_double)
if not tinystdio
conf_data.set('NO_FLOATING_POINT', not newlib_io_float)
conf_data.set('FLOATING_POINT', newlib_io_float)