I have had mixed results preparing DLLs to be called from Maple7 (an
algebraic software package) under Windows 2000.
I can get only as far as preparing a function without arguments,
based on a posting 14 Jun 00 by Carl Thompson:
------------8<------------ top cut -> bottom ------------->8------------
However, if foo() should go into a DLL, your files need to look like this:
--- foo.c ---
/* declaration (AKA prototype) of foo(), usually found in .h file */
__declspec(dllexport) int foo(); /* exporting foo() from this DLL */
/* definition of foo() */
int foo() { return 1; }
-------------
Make a DLL from foo.c:
gcc -c foo.c -o foo.o
gcc -Wl,--out-implib,libfoo.import.a -shared -o foo.dll foo.o
This will create the DLL (foo.dll) and the import library for the DLL
(libfoo.import.a).
------------8<------------ bottom cut <- top ------------->8------------
I do not need to use libfoo.import.a to use foo.dll from Maple7.
I cannot get this to work if I change foo.c to
--- foo.c ---
__declspec(dllexport) int foo(int i);
int foo(int i) { return (i + 10); }
-------------
I've tried examples from some older postings, dating back to 1997 and
1998, but these do not seem to work out.
Is anyone using a current cygwin to prepare DLLs?
Thanks.
Lester
P.S.
I have a Sun PCi card in my Ultra10 running Windows 2000. Unlike some
older cygwin I had a year or so ago, I could not get gcc to compile when
cygwin was installed on a shared Unix directory, though other software
runs fine this way. However, when I installed cygwin on my D drive,
it seems to work fine.
--
Prof. Lester Ingber [EMAIL PROTECTED] [EMAIL PROTECTED]
www.ingber.com www.alumni.caltech.edu/~ingber
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