On Fri, 22 Nov 2002, Andrew DeFaria wrote:
> Peter A. Castro wrote:
> On Fri, 22 Nov 2002, Andrew DeFaria wrote:
>
> I wish to use -mno-cygwin to produce an
> executable that can work without Cygwin
> installed. I have successfully done this before.
> Now I'm adding some functionality to my program
> and it is no longer working! I've worked it out
> such that it will compile and link but when my
> program runs it simply stops returning an exit
> code of 5. Running this under gdb produces a
> SIGSIGV Segmentation fault then you attempt to
> run it.
>
> I've whittled it down to the bare minimum to
> reproduce the problem. Seems to me the problem
> is somewhere between newer versions of gcc 3.X
> and Mingw.
>
> File: foo.c:
>
> #include <stdio.h>
> int main (void) {
> printf ("Hello World\n");
> fprintf (stderr, "%s\n", "Hello World 2");
> }
>
> $ gcc -g foo.c -mno-cygwin -I/usr/include -o foo
> -liberty -lcrtdll -lg
> $ foo
> $
>
> Note that if I do not put -lg then I get:
>
> /tmp/ccKAyr4S.o(.text+0x4b): In function `main':
> /dview/defaria_2.0/salira/neopon/build/maketools/foo.c:4:
> undefined
> reference to `_impure_ptr'
>
> Any ideas?
>
> Well, for one thing, linking with -lg will pull in cygwin.dll
> since /lib/libg.a is a symlink to libcygwin.a. So your
> program won't be Cygwin-free, if that's your goal.
>
> Hey I didn't know that. I saw undefined references to _impure_ptr and
> looked for where it was defined and wham, libg.a came up.
> However, I got it to work with the following command:
>
> $ gcc -g foo.c -mno-cygwin -mwindows -o foo -liberty
> -lmingw32
> $ ./foo.exe > x
> $ cat x
> Hello World
>
> Thanks. I got this contrived example foo.c to work to. However pluging
> these values into my real world problem still fails:
What you show below is only linking. I believe you need to re-compile
all of your source with -mno-cygwin -mwindows as well to make the
_impure_ptr references go away.
> /bin/gcc mksf.o mksfOpts.o mksfIO.o flmCrc.o -mno-cygwin -mwindows
> -liberty -lmingw32 -o mksf
> mksf.o(.text+0x60f): In function `main':
> /dview/defaria_2.0/salira/neopon/build/maketools/mksf.c:29: undefined
> reference to `_impure_ptr'
> mksf.o(.text+0x874):/dview/defaria_2.0/salira/neopon/build/maketools/mksf.c:66:
> undefined reference to `_impure_ptr'
> mksfOpts.o(.text+0x309): In function `usage':
> /dview/defaria_2.0/salira/neopon/build/maketools/mksfOpts.c:13: undefined
> reference to `_impure_ptr'
> mksfOpts.o(.text+0x331):/dview/defaria_2.0/salira/neopon/build/maketools/mksfOp
> s.c:14: undefined reference to `_impure_ptr'
> mksfOpts.o(.text+0x352):/dview/defaria_2.0/salira/neopon/build/maketools/mksfOp
> s.c:15: undefined reference to `_impure_ptr'
> mksfOpts.o(.text+0x36a):/dview/defaria_2.0/salira/neopon/build/maketools/mksfOp
> s.c:16: more undefined references to `_impure_ptr' follow
> make: *** [mksf] Error 1
>
> Again the _impure_ptr things come up. Where is this supposed to be
> resolved from?
>
> --
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> Andrew DeFaria
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> Email: [EMAIL PROTECTED]
> Web: http://DeFaria.com
--
Peter A. Castro <[EMAIL PROTECTED]> or <[EMAIL PROTECTED]>
"Cats are just autistic Dogs" -- Dr. Tony Attwood
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