https://github.com/birros/ld-exported-symbols-demo

Sows how ld exports / hides static library symbols linked to a dynamic library
https://github.com/birros/ld-exported-symbols-demo

c demo dlopen dynamic gcc ld learning library static

Last synced: 2 days ago
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Sows how ld exports / hides static library symbols linked to a dynamic library

• Host: GitHub
• URL: https://github.com/birros/ld-exported-symbols-demo
• Owner: birros
• Created: 2023-08-11T15:59:09.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2023-08-11T16:08:55.000Z (over 1 year ago)
• Last Synced: 2024-04-18T06:44:39.143Z (7 months ago)
• Topics: c, demo, dlopen, dynamic, gcc, ld, learning, library, static
• Language: Makefile
• Homepage:
• Size: 2.93 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# LD exported symbols demo

This repo shows how `ld` exports / hides static library symbols linked to a

dynamic library.

> **Note**

> By default, `ld` exports all symbols from linked static libraries.

> To hide symbols from a specific static library, we need to use this flag:

> `--exclude-libs libstatic.a`.

## Usage

```shell

$ make env # optional

$ make

RULE run

SYMBOLS FROM libdynamic.so (hidden libstatic.a symbols)

0000000000001020 T hello_from_dynamic

SYMBOLS FROM libdynamic_all.so

0000000000001030 T hello_from_dynamic

0000000000001050 T hello_from_static

RUN prog

Hello from prog!

CALL hello_from_dynamic FROM libdynamic.so (dynamically linked):

Hello from static!

Hello from dynamic!

CALL hello_from_static FROM libdynamic_all.so (dynamically opened):

Hello from static!

```