Creating a static-lib project I want to use the GCC flag: fvisibility=hidden Adding this to the compiler flags it is not working. Many thanks in advance for helpful tips!

[OBorg.1]

[Semer CHERNI]

Hello @OBorg.1​ 

First let me thank you for posting.

I am trying to investigate this issue and it would be very helpful if you provide me with:

• What are you trying to achieve and why? 
• Could you let us know the rest of the compiler linker settings?

I will be waiting for your feedback.

Kind regards,

Semer.

[OBorg.1]

Here are the other GCC settings:

-mcpu=cortex-m4 -std=gnu11 -g3 -DDEBUG -DUSE_HAL_DRIVER -DSTM32G431xx -c -I../Drivers/CMSIS/Device/ST/STM32G4xx/Include -I../Drivers/CMSIS/Include -I../Inc -I../Drivers/STM32G4xx_HAL_Driver/Inc -I../Drivers/STM32G4xx_HAL_Driver/Inc/Legacy -I"C:\Users\TE228673\SW_Dev\STM32CubeIDE\workspace_1.7.0\KMX-D\DESIGN_DEMOS\PRIVATE_INCLUDE_FILE_TEST_LIB\Module\PrivateLogicFunctions\Inc" -I"C:\Users\TE228673\SW_Dev\STM32CubeIDE\workspace_1.7.0\KMX-D\DESIGN_DEMOS\PRIVATE_INCLUDE_FILE_TEST_LIB\Module\PublicLogicFunctions\Inc" -O0 -ffunction-sections -fdata-sections -Wall -fvisibility=hidden -v -fstack-usage --specs=nano.specs -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb

I am creating a static-lib project.

This project contains a lot of functions for internal use only. These functions MUST NOT be callable from outside the static lib.

Referring the: https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options

This can usually be achieved by simply using the GCC flag:

-fvisibility=hidden

Unfortunately, this flag does not work in my project in CubeIde.

[OBorg.1]

Hello,

Unfortunately I still haven't found a solution to my problem.

I am looking for a solution in CubeIDE for the following situation:

I need to create a library which:

* implemented some functions that need to be callable from outside

* numerous functions implemented that must NOT be accessible from outside

I have to integrate this library later in an executable project.

How can I achieve this?

[Pavel A. · Accepted solution]

You're making a static library (.a), not a .so. Visibility of publics applies only to exports of shared libraries.

[OBorg.1]

Hello Pavel,

Many thanks for the explanations.

How is a requirement like mine implemented?

(This should be a common use case.)

[OBorg.1]

Maybe some more background information will help:

The code (several libraries) that I create should later be used in various executable MCU projects (by other developers) in the simplest possible way.

In order to prevent manipulation of the code, the actual C code must not be distributed.

(Hence my idea to use .a file(s))