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Writing MakeFile for generating a .so file

Posted on 1998-12-16
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Last Modified: 2013-12-26
I need to write a makefile which creates a .so file
from .cpp files. Can somebody help me in providing me with this sample makefile.

Please also provide me with links to help me in writing makefiles

I tried doing a man but it it is too complicated for me.
A tutorial would be helpfull.
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Question by:vresh
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16 Comments
 
LVL 3

Expert Comment

by:elfie
ID: 1294877
when using gcc compiler

compile object with options ggc -fPIC

When build ing the .so combine all .o files into an so file, using option -G for ld. so it will be ld -G all_o_files -o file.so


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LVL 51

Expert Comment

by:ahoffmann
ID: 1294878
which platform?
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Author Comment

by:vresh
ID: 1294879
Platform is Solaris 2.6
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Author Comment

by:vresh
ID: 1294880
Platform is Solaris 2.6
Elfie, I also require to know how to write a make file.... Thanks
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Expert Comment

by:ahoffmann
ID: 1294881
file.o: file.c
    cc -fPIC -c $< -o $@

libxxx.so: file.o
    ld -B symbolic  -o $@ $<
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Author Comment

by:vresh
ID: 1294882
I require a sample make file to do it and
when i use ld it starts giving me errors like
Undefined                       first referenced
 symbol                             in file
__builtin_vec_new                   cstring.o

Sorry to reject your answer
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LVL 51

Expert Comment

by:ahoffmann
ID: 1294883
You need to pass more information (post Makefile).
Is builtin_vec_new  a function which you have defined in your .c file?
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Expert Comment

by:elfie
ID: 1294884
ahoffman,

for making an .so doesn't you need to specify the -B option?


   -G           In dynamic mode only, produce a shared  object.
                 Undefined symbols are allowed.


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LVL 51

Expert Comment

by:ahoffmann
ID: 1294885
I agree, elfie.
I meant  ld -dy , sorry (options have changed due to different OS releases):
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LVL 3

Expert Comment

by:elfie
ID: 1294886
If the function builtin_vec_new is present in a file (or .so) you added to your link command, try changing the order of the file

if you have a line like
ld -o prog library.so file1.0 file2.o,

change it into
ld -o prog file1.o file2.o library.so


If you are using 'ld' to build the program, you need to specify a n umber of system libraries also, so for building your it's better to use 'cc', so easier is
cc -o prog file1.o file2.o library.so



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LVL 51

Expert Comment

by:ahoffmann
ID: 1294887
hmm, elfie,
order of libs and/.o files should not be essential while using .so libs, .o files are searched first, then all libs
That's one of the advantages of shared objects ;-)
(but ld may have changed its algorithm, I don't know ...)
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LVL 3

Expert Comment

by:elfie
ID: 1294888
we once had problems (on HP-UX 9.x) that the order of libs linking libs could influence the behavior of programs.

In case where a routine resides in two libraries, it took the first instance, and then search further for other called routines.

Probably not the case here, but ...
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Expert Comment

by:tangyw
ID: 1294889
How about using ar command?
please using
%man ar
to see the detail.
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LVL 51

Expert Comment

by:ahoffmann
ID: 1294890
tangyw, we're talking about .so
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Accepted Solution

by:
svedagiri earned 40 total points
ID: 1294891
Since you say that your knowledge on
writing make files are limited, Here is how you have to write you makefile
Actually I am re-iterating what elfie and hoffmann into  the follwing

Copy the following to Makefile
******************************
SO = your.so
OBJ = something.o
CPPS = something.cpp
something.o: $(CPPS)
        gcc -fPIC -c $(CPPS) -o $@
        ld -G $@ -o $(SO)
*******************************

Please remember that before gcc and ld you
have to give tab characters (when you copy this it might
result to blank, just remove the blanks and add a tab)

Hope this is helpfull
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Author Comment

by:vresh
ID: 1294892
It worked but where can I find help on writing makefiles

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