There is a living and breathing example of building a C DLL on the Cygwin site under "DLL STUFF" at http://www.neuro.gatech.edu/users/cwilson/cygutils/V1.1/dll-stuff/
I was able to kludge the example makefile in the "c" directory (see below) with RSI's IDL C external calling example to give an instance of IDL calling a *.c DLL using Cygwin GCC. Obviously you should go through the Readme and so-on on the "DLL STUFF" page; however, cutting right to the chase... 1. on Cygwin $ mkdir /usr/src/dllhelpers-0.2.9 2. Back at the "DLL STUFF" page find "dllhelpers-0.2.9.tar.bz2" (which is http://www.neuro.gatech.edu/users/cwilson/cygutils/V1.1/dll-stuff/dllhelpers -0.2.9.tar.bz2 ) and use Save As to put it into [~approx~C:\Cygwin]\usr\src\dllhelpers-0.2.9 3. on Cygwin $ cd /usr/src/dllhelpers-0.2.9 $ bunzip2 dllhelpers-0.2.9.tar.bz2 $ tar tvf dllhelpers-0.2.9.tar <----have a look first!! $ tar xvf dllhelpers-0.2.9.tar $ cd c <begin real stuff...> Administrator@LEAMAN /usr/src/dllhelpers-0.2.9/c $ make gcc -c -I. -g -Wall -o cdll.o cdll.c gcc -shared -Wl,--out-implib=libcdll.dll.a \ -o cygcdll.dll cdll.o -Wl,--export-all-symbols Creating library file: libcdll.dll.a gcc -c -I. -g -Wall -o usedll.o usedll.c gcc -o usedll.exe -g -Wall usedll.o -L./ -lcdll Warning: resolving _dll_global_int_var by linking to __imp__dll_global_int_var (auto-import) Administrator@LEAMAN /usr/src/dllhelpers-0.2.9/c $ ./usedll dll_int_square (3) = 9 dll_float_square (3.0) = 9.000000 dll_double_square (3.0) = 9.000000 Global integer variable: Should be 99 directly : 99 ..... <end real stuff...> Thanks, John -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Friday, 18 January 2002 1:52 p.m. To: [EMAIL PROTECTED] Subject: Can I build a windows dll and lib from cygwin As I am only just getting into cygwin, I would like to know if it is possible to build a block of unix code (just console applications) and produce a dll which can be called by windows applications. I have done this following the advice on the cygwin sites and produce the 2 files which i thought i needed these are foo.a (renamed to foo.lib below) and foo.dll. When I try to build a windows application linking to foo.a i get an error saying the lib file can not be understood. Have misunderstood the objective of the dll tool is it only to build apps on cygwin? I am using an application called matlab to build this file and get the following echo returned Microsoft (R) 32-Bit Incremental Linker Version 5.00.7022 Copyright (C) Microsoft Corp 1992-1997. All rights reserved. vistaread_mex.obj foo.lib mexversion.res vistaread_mex.obj : error : Internal error during Pass1 Does this mean anything to anyone? Mr. S. Wood, Research assistant Dept Medical Physics & Clinical Engineering I floor Royal Hallamshire Hospital Glossop road, Sheffield, England. S10 2JF -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/ -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
