Why do I receive "cstdlib: No such file or directory"?

Hi,

I'm trying to get started with the UAV Toolbox Support Package for PX4 Autopilot. I have previously managed to get it started with SITL using jMAVsim. Now I want to get started with HITL. I'm trying to use the basic "Code Generation Template" and just build that with nothing changed on my Cube Orange. I have followed this guide for setting it up with Cube Orange: https://se.mathworks.com/help/supportpkg/px4/ug/deployment-cube-orange-autopilot-simulink.html with the only difference being I run it on Ubuntu 20.04 instead of Windows.

But when I try to use build and deploy I get the following error:

Top model targets built:

Model      Action  Rebuild Reason                                    
=====================================================================
untitled1  Failed  Code generation information file does not exist.  

0 of 1 models built (0 models already up to date)
Build duration: 0h 0m 23.189s
Compilation failure for command "/opt/gcc-arm-none-eabi-9-2020-q2-update/bin/arm-none-eabi-g++ -DCONFIG_ARCH_BOARD_CUBEPILOT_CUBEORANGE -D_SYS_CDEFS_H_ -D_SYS_REENT_H_ -D__CUSTOM_FILE_IO__ -D__PX4_NUTTX -D__STDC_FORMAT_MACROS -DMODULE_NAME=\"px4_simulink_app\" -DPX4_MAIN=px4_simulink_app_app_main -DMODEL=untitled1 -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTID01EQ=0 -DTERMFCN=1 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DMT=0 -DPX4 -DFMUvx -DNULL=0 -DMW_PX4_NUTTX_BUILD -DEXTMODE_DISABLETESTING -DEXTMODE_DISABLEPRINTF -DEXTMODE_DISABLE_ARGS_PROCESSING=1 -D__linux__ -DXCP_PLATFORM_LINUX_NO_PIE_SUPPORT -DSTACK_SIZE=64 -D__MW_TARGET_USE_HARDWARE_RESOURCES_H__ -DRT -mcpu=cortex-m7 -mthumb -mfpu=fpv5-d16 -mfloat-abi=hard -Os -DNDEBUG   -g -fdata-sections -ffunction-sections -fomit-frame-pointer -fmerge-all-constants -fno-signed-zeros -fno-trapping-math -freciprocal-math -fno-math-errno -fno-strict-aliasing -fvisibility=hidden -include visibility.h -Wall -Wextra -Warray-bounds -Wcast-align -Wdisabled-optimization -Wdouble-promotion -Wfatal-errors -Wfloat-equal -Wformat-security -Winit-self -Wlogical-op -Wpointer-arith -Wshadow -Wuninitialized -Wunknown-pragmas -Wunused-variable -Wno-missing-field-initializers -Wno-missing-include-dirs -Wno-unused-parameter -fdiagnostics-color=always -Wno-stringop-truncation -fno-builtin-printf -fno-strength-reduce -Wformat=1 -Wunused-but-set-variable -Wno-format-truncation -fcheck-new -fno-exceptions -fno-rtti -fno-threadsafe-statics -Wreorder -Wno-overloaded-virtual -nostdinc++ -fno-sized-deallocation -Wframe-larger-than=2000 -fpermissive -Wno-narrowing -std=gnu++14  -I../../boards/cubepilot/cubeorange/src -I../../platforms/nuttx/src/px4/common/include -I. -Isrc/lib -I../../platforms/nuttx/src/px4/stm/stm32h7/include -I../../platforms/common -I../../platforms/common/include -I../../src -I../../src/include -I../../src/lib -I../../src/lib/matrix -I../../src/modules -INuttX/nuttx/arch/arm/src/armv7-m -INuttX/nuttx/arch/arm/src/chip -INuttX/nuttx/arch/arm/src/common -INuttX/apps/include -Iexternal/Install/include -I../../src/modules/px4_simulink_app -I../../src/modules/mavlink -I../../mavlink/include/mavlink -I/home/sorenmadsen/t -I/home/sorenmadsen/Documents/MATLAB/SupportPackages/R2022b/toolbox/target/supportpackages/px4/include -I/home/sorenmadsen/t/untitled1_ert_rtw -I/home/sorenmadsen/Desktop/Matlab/extern/include -I/home/sorenmadsen/Desktop/Matlab/simulink/include -I/home/sorenmadsen/Desktop/Matlab/rtw/c/src -I/home/sorenmadsen/Desktop/Matlab/rtw/c/src/ext_mode/common -I/home/sorenmadsen/Desktop/Matlab/rtw/c/ert -I/home/sorenmadsen/Desktop/Matlab/rtw/c/src/ext_mode/serial -o src/modules/px4_simulink_app/CMakeFiles/modules__px4_simulink_app.dir/MW_uORB_Read.cpp.obj -c ../../src/modules/px4_simulink_app/MW_uORB_Read.cpp" with error "In file included from [01m[K<command-line>[m[K:
[01m[K../../src/include/visibility.h:118:10:[m[K [01;31m[Kfatal error: [m[Kcstdlib: No such file or directory
  118 | #include [01;31m[K<cstdlib>[m[K
      |          [01;31m[K^~~~~~~~~[m[K
compilation terminated.
"

Does anyone know the reason for my error?

[Arun Mathamkode]

I am not able to see the error. The field looks blank. Can you please add the error message?

[Søren]

@Arun Mathamkode sorry for the late response, I had the flu over Christmas.

Can you see the error now? I don't know why it didn't show up last time.

Answer 1

[Ankur Bose]

This issue is most likely due to GCC unable to find a package while compilation in your Ubuntu 20.04 installation. There are workarounds in Ubuntu forum to resolve this but none of them are guranteed and full-proof.

While we investigate the issue, can you try a simple workaround in your MATLAB? Run the below command in MATLAB command window immediately after launch and try building the Simulink model.

setpref('MW_PX4_Build','FullFirmwareBuild',true)

This command will do the full PX4 Firmware build and the make will pull in the required packages and hence you should not see the issue.