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shared_library abi
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‎shared_library/README.md‎

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1. [Basic](basic/)
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1. [Lib-lib dependency](lib_lib_dependency/)
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1. [Symbol version](symbol_version/)
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1. [ABI](abi/)
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Minimal example of a dynamic and static libraries.
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‎shared_library/abi/README.md‎

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https://stackoverflow.com/questions/2171177/what-is-an-application-binary-interface-abi/54967743#54967743

‎shared_library/abi/clean‎

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#!/usr/bin/env bash
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rm -rf v1/*.o v1/*.so v2/*.o v2/*.so *.out

‎shared_library/abi/main.c‎

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#include <assert.h>
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#include <stdlib.h>
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#include "mylib.h"
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int main(void) {
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mylib_mystruct *myobject = mylib_init(1);
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assert(myobject->old_field == 1);
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free(myobject);
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return EXIT_SUCCESS;
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}

‎shared_library/abi/test‎

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#!/usr/bin/env bash
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set -eu
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cc='gcc -pedantic-errors -std=c89 -Wall -Wextra'
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for d in v1 v2_bad v2_good; do
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$cc -fPIC -c -o "$d/mylib.o" "$d/mylib.c"
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$cc -L . -shared -o "$d/libmylib.so" "$d/mylib.o"
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done
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$cc -I v1 -L v1 -o main.out main.c -lmylib
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LD_LIBRARY_PATH=v1 ./main.out
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! LD_LIBRARY_PATH=v2_bad ./main.out
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LD_LIBRARY_PATH=v2_good ./main.out
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$cc -I v2_bad -L v2_bad -o main.out main.c -lmylib
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LD_LIBRARY_PATH=v2_bad ./main.out

‎shared_library/abi/v1/mylib.c‎

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#include <stdlib.h>
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#include "mylib.h"
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mylib_mystruct* mylib_init(int old_field) {
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mylib_mystruct *myobject;
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myobject = malloc(sizeof(mylib_mystruct));
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myobject->old_field = old_field;
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return myobject;
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}

‎shared_library/abi/v1/mylib.h‎

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#ifndef MYLIB_H
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#define MYLIB_H
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typedef struct {
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int old_field;
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} mylib_mystruct;
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mylib_mystruct* mylib_init(int old_field);
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#endif

‎shared_library/abi/v2_bad/mylib.c‎

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#include <stdlib.h>
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#include "mylib.h"
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mylib_mystruct* mylib_init(int old_field) {
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mylib_mystruct *myobject;
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myobject = malloc(sizeof(mylib_mystruct));
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myobject->old_field = old_field;
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myobject->new_field = 2;
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return myobject;
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}

‎shared_library/abi/v2_bad/mylib.h‎

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#ifndef MYLIB_H
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#define MYLIB_H
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typedef struct {
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int new_field;
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int old_field;
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} mylib_mystruct;
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mylib_mystruct* mylib_init(int old_field);
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#endif

‎shared_library/abi/v2_good/mylib.c‎

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#include <stdlib.h>
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#include "mylib.h"
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mylib_mystruct* mylib_init(int old_field) {
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mylib_mystruct *myobject;
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myobject = malloc(sizeof(mylib_mystruct));
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myobject->old_field = old_field;
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myobject->new_field = 2;
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return myobject;
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}

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