Mail Archives: cygwin/2006/08/02/10:11:51
On 01 August 2006 15:39, Ben Wright wrote:
> g++ -mno-cygwin -Wl,--add-stdcall-alias
> -I/cygdrive/c/Java/jdk1.5.0_07/include
> -I/cygdrive/c/Java/jdk1.5.0_07/include/win32 -shared -o Samplers.dll <a
> whole bunch of source files here> -lstdc++ -lg2c
>
> /cygdrive/c/DOCUME~1/ben/LOCALS~1/Temp/ccWWbiIF.o:gengam.f(.text+0x5):
> undefined reference to `_dgamdv_'
> (plus others of similar form)
>
> The linker can't seem to find references of the form _dgamdv_. Functions
> are defined in the c portion as gdamdv_(<whatever>), and are called from
> Fortran as DGAMDV(). This works fine under Linux.
Not quite sure why you would expect a function called _dgamdv_ to match one
which is called gdamdv_XXXXXX. They appear to have very different names, and
one has a suffix where the other doesn't. Is there some kind of typo in this
para?
> What's baffling is that if I compile just the c portion and inspect the
> output with nm then the supposedly undefined references are in there.
>
> 10004148 T _dgamdv_
However, this suggests that the real problem is just that the source files
are in the wrong (meaning non-dependency) order on the compiler command line,
and hence on the linker command line.
> Is there some quirk of cygwin when calling c from within fortran I need
> to set a flag for when compiling? I'd ordinarily chalk it up to my weak
> knowledge of c- but it compiles without complaint under Linux.
This works fine on Linux where a shared lib can contain undefined references
that are linked up at runtime, but it doesn't work on 'doze where a dll has to
be fully resolved. To fix it, you could just reorder the source files into
dependency order on the command-line, so that any file that refers to an
undefined symbol comes *before* the file that supplies that symbol, or you
could separate compiling and linking into two separate stages, and use the
--start-group and --end-group options to wrap all the object files on the
linker command line.
cheers,
DaveK
--
Can't think of a witty .sigline today....
--
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Problem reports: http://cygwin.com/problems.html
Documentation: http://cygwin.com/docs.html
FAQ: http://cygwin.com/faq/
- Raw text -