On Mon, Mar 15, 2021 at 6:00 PM Flavio Castro Alves Filho <
flavio.al...@gmail.com> wrote:
> Hello,
>
> I am trying to use STL in a simple C++ Hello project and I am getting
> compilation error.s
>
> Is STL supported in NuttX? Can I use it?
>
>
Yes, you can. Please reference the following config and Make.defs to setup
your C++ environment:
nuttx/boards/arm/stm32/stm32f4discovery/configs/cxxtest/defconfig
nuttx/boards/sim/sim/sim/configs/cxxtest/defconfig
nuttx/nuttx/boards/sim/sim/sim/configs/libcxxtest/defconfig
> Here is my sample code:
>
> === Hello.cpp ===
> #include <stdio.h>
> #include "HelloWorld.h"
>
> CHelloWorld::CHelloWorld() {
> mSecret = 42;
> printf("Constructor: mSecret=%d\n",mSecret);
> }
>
> CHelloWorld::~CHelloWorld() {
>
> }
>
> bool CHelloWorld::HelloWorld(void) {
> printf("HelloWorld: mSecret=%d\n",mSecret);
>
> if (mSecret == 42) {
> printf("CHelloWorld: HelloWorld: Hello, world!");
> return true;
> }
> else {
> printf("CHelloWorld: HelloWorld: CONSTRUCTION FAILED!\n");
> return false;
> }
> }
> =========
>
> === Hello.h ===
> class CHelloWorld
> {
> public:
> CHelloWorld();
> ~CHelloWorld();
> bool HelloWorld(void);
> private:
> int mSecret;
> };
> =========
>
> === Log.cpp ===
> #include "Log.h"
> #include <stdio.h>
> #include <string>
>
> void Log::print(std::string_view message) {
>
> FILE *fp = fopen("/dev/ttyS0", "w");
> if (fp == NULL) {
> printf("Error opening serial port!\n");
> return;
> }
>
> std::string msgStr { message };
>
> /* Try to force input data on stdin */
> fwrite(msgStr.c_str(), sizeof(char), message.length(), fp);
>
> fclose(fp);
> }
> =========
>
> === Log.h ===
> #include <string_view>
>
> class Log {
> public:
> static void print(std::string_view message);
> };
> =========
>
> And there the compilation error:
> =========
> -- Build files have been written to: /home/ubuntu/nuttx-apps/hellocpp/build
> [4/4] Linking CXX executable src/hellocpp
> FAILED: src/hellocpp
> : && arm-none-eabi-ld --entry=__start -nostartfiles -nostdlib
> -nodefaultlibs
> -T/home/ubuntu/nuttx-apps/hellocpp/nuttx-export-9.1.0/scripts/ld.script
> -o hellocpp.elf src/CMakeFiles/hellocpp.dir/HelloWorld.cpp.o
> src/CMakeFiles/hellocpp.dir/Log.cpp.o
> src/CMakeFiles/hellocpp.dir/main.cpp.o
> -L/home/ubuntu/nuttx-apps/hellocpp/src/hellocpp
> -L/home/ubuntu/nuttx-apps/hellocpp/nuttx-export-9.1.0/libs
> --start-group -lc -larch -lbinfmt -lboard -lboards -ldrivers
> -lfs -lmm -lsched -lxx -lnet -lsupc++
> /usr/lib/gcc/arm-none-eabi/9.2.1/thumb/v7e-m/nofp/libgcc.a
> --end-group && cd /home/ubuntu/nuttx-apps/hellocpp/build/src &&
> arm-none-eabi-objcopy -S -O binary
> /home/ubuntu/nuttx-apps/hellocpp/build/hellocpp.elf
> /home/ubuntu/nuttx-apps/hellocpp/build/hellocpp.bin
> arm-none-eabi-ld: src/CMakeFiles/hellocpp.dir/Log.cpp.o: in function
> `void std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::_M_construct<char const*>(char const*, char
> const*, std::forward_iterator_tag)':
> /usr/include/newlib/c++/9.2.1/bits/basic_string.tcc:212: undefined
> reference to `std::__throw_logic_error(char const*)'
> arm-none-eabi-ld:
> /usr/include/newlib/c++/9.2.1/bits/basic_string.tcc:219: undefined
> reference to `std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::_M_create(unsigned int&, unsigned int)'
> arm-none-eabi-ld:
> /usr/include/newlib/c++/9.2.1/bits/basic_string.tcc:225: undefined
> reference to `std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::_S_copy_chars(char*, char const*, char
> const*)'
> arm-none-eabi-ld: src/CMakeFiles/hellocpp.dir/Log.cpp.o: in function
> `std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::~basic_string()':
> /usr/include/newlib/c++/9.2.1/bits/basic_string.h:658: undefined
> reference to `std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::_M_dispose()'
> arm-none-eabi-ld:
> /usr/include/newlib/c++/9.2.1/bits/basic_string.h:658: undefined
> reference to `std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::_M_dispose()'
> ninja: build stopped: subcommand failed.
> make[1]: *** [Makefile:13: _build] Error 1
> make[1]: Leaving directory '/home/ubuntu/nuttx-apps/hellocpp'
> make: *** [Makefile:25: default] Error 2
> =========
>
> My CMakelists:
>
> === CMakeLists.txt ===
> cmake_minimum_required(VERSION 3.2...3.15)
>
> project(hellocpp
> VERSION 1.0
> DESCRIPTION "Hello world C++ Nuttx"
> )
>
> set(CMAKE_CXX_STANDARD 17)
> set(CMAKE_CXX_STANDARD_REQUIRED ON)
> set(CMAKE_C_STANDARD 99)
>
> set(NUTTX_PATH "${CMAKE_SOURCE_DIR}/nuttx-export-9.1.0")
>
> include(cmake/phigw.cmake)
>
> set(AC_COMMON_FLAGS "${AC_COMMON_FLAGS} -fno-builtin -Wall -Wshadow
> -Wundef -g")
>
> set(AC_DEFINES "${AC_DEFINES} -DCONFIG_WCHAR_BUILTIN")
>
> include_directories(
> src
> ${NUTTX_PATH}/include
> ${NUTTX_PATH}/arch/chip
> )
>
> set(EXE_NAME hellocpp)
>
> set(CMAKE_CXX_FLAGS "${AC_HW_FLAGS} ${AC_DEFINES} ${AC_COMMON_FLAGS}
> ${AC_CXX_EXTRA_FLAGS}")
> if (PARAM_DEBUG)
> set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Os -g")
> else()
> set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Os")
> endif()
>
> set(CMAKE_SKIP_RPATH ON)
> set(CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_LINKER} ${AC_LINKER_FLAGS} -o
> ${EXE_NAME}.elf <OBJECTS> <LINK_LIBRARIES>")
>
> set(BUILD_SHARED_LIBS OFF)
>
> add_subdirectory(src)
> =========
>
> === src/CMakelists.txt ===
> set(HEADER_FILES
> HelloWorld.h
> Log.h
> )
>
> set(SOURCE_FILES
> HelloWorld.cpp
> Log.cpp
> )
>
> link_directories(${EXE_NAME} ${NUTTX_PATH}/libs)
>
> add_executable(${EXE_NAME} ${SOURCE_FILES} main.cpp ${HEADER_FILES})
>
> add_custom_command(
> TARGET ${EXE_NAME}
> POST_BUILD
> COMMAND ${CMAKE_OBJCOPY} ARGS -S -O binary
> ${CMAKE_BINARY_DIR}/${EXE_NAME}.elf
> ${CMAKE_BINARY_DIR}/${EXE_NAME}.bin
> )
>
> target_link_libraries(${EXE_NAME} --start-group)
> target_link_libraries(${EXE_NAME} c)
> target_link_libraries(${EXE_NAME} arch)
> target_link_libraries(${EXE_NAME} binfmt)
> target_link_libraries(${EXE_NAME} board)
> target_link_libraries(${EXE_NAME} boards)
> target_link_libraries(${EXE_NAME} drivers)
> target_link_libraries(${EXE_NAME} fs)
> target_link_libraries(${EXE_NAME} mm)
> target_link_libraries(${EXE_NAME} sched)
> target_link_libraries(${EXE_NAME} xx)
> target_link_libraries(${EXE_NAME} net)
> target_link_libraries(${EXE_NAME} supc++)
> target_link_libraries(${EXE_NAME}
> /usr/lib/gcc/arm-none-eabi/9.2.1/thumb/v7e-m/nofp/libgcc.a)
> target_link_libraries(${EXE_NAME} --end-group)
> =========
>
> I am using Ubuntu 20.04 operating system and the toolchain provided
> from the Ubuntu Repository.
>
> Best regards,
>
> Flavio
>
>
>
>
> --
> Flavio de Castro Alves Filho
>
> flavio.al...@gmail.com
> Twitter: http://twitter.com/#!/fraviofii
> LinkedIn profile: www.linkedin.com/in/flaviocastroalves
>
