nuttx/libs/libxx/libcxx.defs

############################################################################
# libs/libxx/libcxx.defs
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.  The
# ASF licenses this file to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance with the
# License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
# License for the specific language governing permissions and limitations
# under the License.
#
###########################################################################

LIBCXX_VERSION=$(patsubst "%",%,$(CONFIG_LIBCXX_VERSION))

# Download and unpack tarball if no git repo found
ifeq ($(wildcard libcxx/.git),)
libcxx-$(LIBCXX_VERSION).src.tar.xz:
	$(call DOWNLOAD,https://github.com/llvm/llvm-project/releases/download/llvmorg-$(LIBCXX_VERSION),libcxx-$(LIBCXX_VERSION).src.tar.xz)

libcxx: libcxx-$(LIBCXX_VERSION).src.tar.xz
	$(Q) tar -xf libcxx-$(LIBCXX_VERSION).src.tar.xz \
	         --exclude libcxx-$(LIBCXX_VERSION).src/test/std/pstl
	$(Q) mv libcxx-$(LIBCXX_VERSION).src libcxx
	$(Q) touch $@
endif

$(TOPDIR)/include/libcxx: libcxx
	$(Q) $(DIRLINK) $(CURDIR)/libcxx/include $(TOPDIR)/include/libcxx
	$(Q) cp $(CURDIR)/__config_site $(TOPDIR)/include/libcxx/__config_site

context:: $(TOPDIR)/include/libcxx

distclean::
	$(Q) $(DIRUNLINK) $(TOPDIR)/include/libcxx
ifeq ($(wildcard libcxx/.git),)
	$(Q) $(DELFILE) libcxx-$(LIBCXX_VERSION).src.tar.xz
	$(call DELDIR, libcxx)
endif

CXXFLAGS += ${DEFINE_PREFIX}_LIBCPP_BUILDING_LIBRARY
CXXFLAGS += ${INCDIR_PREFIX}$(CURDIR)/libcxx/src

ifeq ($(CONFIG_LIBSUPCXX), y)
CXXFLAGS += ${DEFINE_PREFIX}__GLIBCXX__
endif

# Workaround the following warning with "c++ (Ubuntu 9.3.0-10ubuntu2) 9.3.0"
#
# libcxx/src/barrier.cpp: In constructor 'std::__1::__barrier_algorithm_base::__barrier_algorithm_base(ptrdiff_t&)':
# libcxx/src/barrier.cpp:35:9: warning: declaration of '__expected' shadows a member of 'std::__1::__barrier_algorithm_base' [-Wshadow]
#    35 |         : __expected(__expected)
#       |         ^
# libcxx/src/barrier.cpp:29:24: note: shadowed declaration is here
#    29 |     ptrdiff_t&         __expected;
#       |                        ^~~~~~~~~~
libcxx/src/barrier.cpp_CXXFLAGS += -Wno-shadow
libcxx/src/locale.cpp_CXXFLAGS += -Wno-shadow
libcxx/src/filesystem/operations.cpp_CXXFLAGS += -Wno-shadow

# Workaround the following warning with "GCC 12"
#
# ...
# include/libcxx/string:2156:35: warning: '__temp' may be used uninitialized [-Wmaybe-uninitialized]
#  2156 |         this->__throw_length_error();
#       |         ~~~~~~~~~~~~~~~~~~~~~~~~~~^~
# include/libcxx/string:614:1: note: by argument 1 of type 'const std::__1::__basic_string_common<true>*' to 'void std::__1::__basic_string_common<<anonymous> >::__throw_length_error() const [with bool <anonymous> = true]' declared here
#   614 | __basic_string_common<__b>::__throw_length_error() const
#       | ^~~~~~~~~~~~~~~~~~~~~~~~~~
# include/libcxx/string:2676:32: note: '__temp' declared here
#  2676 |             const basic_string __temp (__first, __last, __alloc());
#       |                                ^~~~~~

ifeq ($(GCCVER),)
  export GCCVER = $(shell $(CXX) --version | grep g++ | sed -E 's/.* ([0-9]+\.[0-9]+).*/\1/' | cut -d'.' -f1)
endif

ifeq ($(GCCVER),12)
  libcxx/src/filesystem/operations.cpp_CXXFLAGS += -Wno-maybe-uninitialized
  libcxx/src/locale.cpp_CXXFLAGS += -Wno-maybe-uninitialized
endif

# Workaround the following warning with "GCC 12"
#
# ...
# include/libcxx/new:237:24: warning: argument 1 value '18446744073709551599' exceeds maximum object size 9223372036854775807 [-Walloc-size-larger-than=]
#  237 |   return ::operator new(__args...);
#      |          ~~~~~~~~~~~~~~^~~~~~~~~~~

ifeq ($(GCCVER),12)
  libcxx/src/string.cpp_CXXFLAGS += -Wno-alloc-size-larger-than
endif

# The following warning was observed with icicle:knsh config.
# Looking at the code in question, it seems harmless to ignore.
#
# Note: For some reasons, GCC -Wall enables a different set of warnings
# for C and C++.
#
# References:
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10604
# https://github.com/gcc-mirror/gcc/blob/e54375d85d4aa5889869c2672158083b2106b623/gcc/c-family/c.opt#L1285-L1287
#
# CXX:  libcxx/src/condition_variable.cpp
# libcxx/src/condition_variable.cpp: In member function 'void std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long int, std::__1::ratio<1, 1000000000> > >)':
# libcxx/src/condition_variable.cpp:64:19: error: comparison of integer expressions of different signedness: 'std::__1::chrono::duration<long long int>::rep' {aka 'long long int'} and 'std::__1::__libcpp_numeric_limits<long unsigned int, true>::type' {aka 'long unsigned int'} [-Werror=sign-compare]
#      if (s.count() < ts_sec_max)
#          ~~~~~~~~~~^~~~~~~~~~~~
libcxx/src/condition_variable.cpp_CXXFLAGS += -Wno-sign-compare

# When building with GCC 12.2.0
# libcxx has a fallback to use __always_inline__ when the (clang) exclude_from_explicit_instantiation isn't available.
# This causes: `always_inline` function might not be inlinable [-Wattributes] warnings in some modules.
# For example:
# libcxx/src/include/to_chars_floating_point.h:988:17: warning: ‘always_inline’ function might not be inlinable [-Wattributes]
# Should be OK to ignore these
ifeq ($(GCCVER),12)
	libcxx/src/charconv.cpp_CXXFLAGS += -Wno-attributes
endif

# Another warning on gcc 12.2.0
# libcxx/src/locale.cpp:6604:85: warning: type attributes ignored after type is already defined [-Wattributes]
# 6604 | template class _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS codecvt_byname<char16_t, char, mbstate_t>;
#      |                                                                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# libcxx/src/locale.cpp:6605:85: warning: type attributes ignored after type is already defined [-Wattributes]
# 6605 | template class _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS codecvt_byname<char32_t, char, mbstate_t>;
ifeq ($(GCCVER),12)
	libcxx/src/locale.cpp_CXXFLAGS += -Wno-attributes
endif


CPPSRCS += $(wildcard libcxx/src/*.cpp)
CPPSRCS += $(wildcard libcxx/src/experimental/*.cpp)
CPPSRCS += $(wildcard libcxx/src/filesystem/*.cpp)