Re: [Mingw-users] adding my own libraries to mingw

[John B. <joh...@ho...>]

Hello Bill,
On Thu, 25 Nov 2010 08:19:56 +0000, William Simpson wrote:

...
>
> I am trying to migrate from djgpp (a species of gnu c compiler) under
> DOS to mingw under Windows XP. Sorry for my questions. I really have
> looked and it is difficult to find the info I need.
>
> From:
>
> http://www.mingw.org/wiki/IncludePathHOWTO
> http://www.mingw.org/wiki/SpecsFileHOWTO
>
> it seems I have a few options.
>
> Under djgpp I did as follows, for a library I wrote called rand. I
> have djgpp\lib\src\rand\rand.c
> I have the source rand.c, the header rand.h, and the makefile there.
> In the makefile I have
> rand: rand.c
> gcc -c rand.c
> ar rvs librand.a rand.o
> del rand.o
> move librand.a \djgpp\lib
> copy rand.h \djgpp\include
>
> Then subsequently I put #include "rand" at the top of any program that
> uses it and put -lrand in my makefile when I compile it.
>
> First, I think that for mingw I need to put a "\" at the ends of the
> lines like so:
> rand: rand.c
> gcc -c rand.c \
> ar rvs librand.a rand.o \
> del rand.o \
> move librand.a \djgpp\lib \
> copy rand.h \djgpp\include
>
No trailing slash is required.

> By analogy, maybe in mingw I would do:
> move librand.a c:\mingw\lib \
> copy rand.h c:mingw\include
>
> I am not at all sure about:
> ar rvs librand.a rand.o \
>
Other than the trailing \, this is correct.

>
>>From what I read, one possibility is to stick the libraries in
> c:\mingw\local
> or maybe c:\mingw\local\lib ?
> This seems nice, because it keeps my libraries separate from mingw's.
I normally do this, but if you want to keep your libraries separate
from mingw's, then you should keep the header files separate too.
> Would mingw be smart enough to know to look there? Otherwise I guess I
> would need to set LIBRARY_PATH? How?

Use the -I and -L flags when you compile programs that use your libraries.
gcc -I \path\to\headers -L\path\to\libraries etc.
Run 'gcc -v --help' for help generally.
>
> How about the header files? Where do they go?
> c:\mingw\local
> c:\mingw\local\include ?
> Would mingw be smart enough to know to look there? Maybe there's an
> INCLUDE_PATH?
See above.

>
> Fiddling with Specs seems an option too, but it is too sketchy for me
> to figure out.
>
I would leave the specs file alone. You don't have to do anything
different if you don't want to.
> Any tips appreciated!!
>
> Thanks very much
> Bill
>
Regards,
Alias John Brown.