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Using autoconf for a shared library

From: Thomas Nyberg
Subject: Using autoconf for a shared library
Date: Mon, 15 Aug 2016 12:29:40 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.1.0


I've been reading the manuals for autoconf/automake and have been unable to get a setup working correctly with autoconf. I've written up a toy shared library and right now the Makefile has a rule to install the library directly to `/usr/local`. All I really want from autoconf is to be able to have `--prefix` user-configurable. I figured it was better to use autoconf/automake than reinvent the wheel, but I'm totally unable to get it working.

Does anyone here know a source for a very simple example of what is needed ( to get this type of setup working? I've been reading both manuals, but I can't figure it out. Maybe someone here can even immediately see how to do this.

I'm attaching an extremely simplified version of a shared library setup. I'm also pasting the text of the files in below in case you just want to read directly (instead of extracting something from a random person on the internet). Basically if you run `make` it compiles a shared library for you with publicly exports one function called `public_func`. If you run `make test` it will test it by setting the current directory to LD_LIBRARY_PATH. You can install it by running `make install` and then ldconfig (though I doubt you want to...). This is the repo structure:

├── include
│   └── public.h
├── Makefile
├── src
│   ├── private.c
│   ├── private.h
│   └── public.c
└── test.c

Here are the files:

int public_func(void);

#include <private.h>

int public_func(void) {
    return private_func();

int private_func(void);

#include <private.h>

int private_func(void) {
    return 1;

#include <public.h>
#include <stdio.h>

int main(void) {
    printf("public value: %d\n", public_func());
    return 0;

so =
solinkname = -lpublic

install_target = /usr/local

srcs = $(wildcard src/*.c)
objs = $(patsubst %.c,%.o,$(srcs))

includes = include/public.h
installed_includes = $(addprefix $(install_target)/,$(includes))

cc = gcc
cflags = -c -g -fPIC -Wall -Wextra -Wfatal-errors -pedantic-errors
privateincludedirs = -Isrc
publicincludedirs = -Iinclude
ldflags = -shared -Wl,-soname,$(so)

all: $(so)

$(so): $(objs)
        $(cc) $(ldflags) $(objs) -o $(so)

        $(cc) $(cflags) $(privateincludedirs) -c -o $@ $<

        rm -f *.o src/*.o *.so test

        cp -v $(includes) $(install_target)/include
        cp -v $(so) $(install_target)/lib

Thanks for any help!


Attachment: library.tar.bz2
Description: application/bzip

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