Creating static libraries using gcc

Creating static libraries using gcc

[Scott Sinclair]

Hi

I have a large number of related C++ source files which I want to combine
into a static library using gcc 2.95.3-5 with cygwin. Could anyone tell me
which linker options I need to specify to accomplish this ? I have tried to
link the object files using the -shared switch (although I suspect this
produces something similar to a Windows dll ?) and the object code links
cleanly. 

However, when I try to build an executable which requires linking with my
library I get the following error--
	collect2:ld terminated with signal 11 [Segmentation fault]

Any help will be appreciated as I can't seem to find anything useful in the
documentation yet.

Thanks
Scott

Re: Creating static libraries using gcc

[bjorn rohde jensen]

Hi guys,

> By the way, I dont know how to create shared library in Linux. this is
> what i've heard about it, but i don't know if it works.
> 
> g++ -fPIC -c file1.cpp
> g++ -fPIC -c file2.cpp
> 
> g++ -shared -o libshared.so file1.o
> how can I put file2.o in libshared.so?
> 
 Right, this is pretty much the standard way to build shared libraries
on linux and other unix flavors. The choice of compiler and options
needed does vary a bit. To build a shared library with more than 1
.o file, you simply list more than 1, it is that simple.

g++ -shared -o libshared.so *.o

> When I have a new file, is that right if I do
> 
> g++ newfile.cpp libshared.so?
> 

Maybe, i think, you can link with a shared library like that. I prefer
putting the libraries in a lib directory somewhere,so they don't clutter
my working directory, and use

g++ -o main -L/somepath/lib -lshared main.cpp

Yours sincerely,

Bjorn

RE: Creating static libraries using gcc

[Thai Dang Vu]

Compile all of your C++ source files to object file (file.o). Thenput
them in a library with

ar cr libraryfile.a file1.o file2.o

When you have a new file, say filenew.cpp, you can compile and link it
with

g++ filenew.cpp libraryfile.a

By the way, I dont know how to create shared library in Linux. this is
what i've heard about it, but i don't know if it works.

g++ -fPIC -c file1.cpp
g++ -fPIC -c file2.cpp

g++ -shared -o libshared.so file1.o
how can I put file2.o in libshared.so?

When I have a new file, is that right if I do

g++ newfile.cpp libshared.so?

Regards.

-----Original Message-----
From: Scott Sinclair [mailto:scott.sinclair@umgeni.co.za]
Sent: Tuesday, March 19, 2002 4:06 PM
To: gcc-help@gcc.gnu.org
Subject: Creating static libraries using gcc


Hi

I have a large number of related C++ source files which I want to
combine
into a static library using gcc 2.95.3-5 with cygwin. Could anyone tell
me
which linker options I need to specify to accomplish this ? I have tried
to
link the object files using the -shared switch (although I suspect this
produces something similar to a Windows dll ?) and the object code links
cleanly. 

However, when I try to build an executable which requires linking with
my
library I get the following error--
	collect2:ld terminated with signal 11 [Segmentation fault]

Any help will be appreciated as I can't seem to find anything useful in
the
documentation yet.

Thanks
Scott