Creating a simple Makefile to build a shared library

Question

I am trying to create a very basic hand crafted Makefile to create a shared library to illustrate a point.

This is what I have so far:

SHELL = /bin/sh
CC         


        

Answer 1

Compile with -shared:

gcc -o libfoo.so module1.o module2.o -shared

(This also works on MingW under Windows to produce DLLs.)

Answer 2

this is my goto makefile rule for so files:

%.so: %.o ; $(LINK.c) $(LDFLAGS) -shared $^ -o $@

can be used like so

CFLAGS+=-fPIC

libmyfoo.so:  # create from libmyfoo.o

# or 

libmyfoo.so: myfoo.o  # create from myfoo.o 

Answer 3

Since you try to build so file, you probably need -shared.

Answer 4

The solution was to modify the XXFLAGS as follows:

FLAGS        = # -std=gnu99 -Iinclude
CFLAGS       = -fPIC -g #-pedantic -Wall -Wextra -ggdb3
LDFLAGS      = -shared

Answer 5

Example for C++ files. Also included a clean target

.PHONY : clean

CPPFLAGS= -fPIC -g
LDFLAGS= -shared

SOURCES = $(shell echo *.cpp)
HEADERS = $(shell echo *.h)
OBJECTS=$(SOURCES:.cpp=.o)

FIKSENGINE_LIBDIR=../../../../lib
FIKSENGINE_INCDIR=../../../../include

TARGET=$(FIKSENGINE_LIBDIR)/tinyxml.so

all: $(TARGET)

clean:
    rm -f $(OBJECTS) $(TARGET)

$(TARGET) : $(OBJECTS)
    $(CC) $(CFLAGS) $(OBJECTS) -o $@ $(LDFLAGS)