Re: pari & cygwin insurmountable difficulty saga!

[hatrick@hushmail.com]

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Hello and many thanks for the fast responses;

I have tried a number of increasingly drastic things in the past hours.
the good news:
i have learned rather more about the pari / cygwin build proc.
also: Iwao's static build suggestion works.

the bad news:
still no joy on building the dll.

i'm afraid i can't find any file where __imp_reent_data is global and *not*
extern;
could this be the prob?
Following Gerhard's suggestion I changed Makefile.DLLs to contain

extern __declspec(dllimport) struct _reent reent_data;

in the hope that this might do something. no joy ( see result below).

Sooo any enlightening comments would still be much appreciated.

Thanks & regards,
Kerr Hatrick.

# following is result of replacing appropriate line by
# echo 'extern __declspec(dllimport) struct _reent __imp_reent_data;'		>>
dll_init.c
# in makefile.DLLs:

$ make gp
echo EXPORTS > libpari.def
echo libpari_impure_ptr = _impure_ptr >> libpari.def
nm libpari.a | sed -n '/^........ [BCDRT] _/s/[^_]*_//p' >> libpari.def
dlltool                 \
        --def libpari.def                                       \
        --dllname libpari.dll                           \
        --output-exp libpari.exp                                \
        --output-lib libpari_dll.a
echo "/* automatically generated by Makefile.DLLs */"   > libpari_dll.c
echo "void *_impure_ptr;"                               >> libpari_dll.c
/usr/bin/gcc -O3 -DGCC_INLINE -Wall -Wno-implicit       -malign-loops=2
-malign-jumps=2 -malign-functions=2 -fomit-frame-pointer   -I. -I../src/head
ers  -c -o libpari_dll.o libpari_dll.c
/usr/bin/ld -shared -soname libpari.dll  --dll -o libpari.dll
        \
        -e _dll_entry@12                                        \
        libpari.exp libpari.a libpari_dll.o
        \
        dll_init.o dll_fixup.o                                  \
                                                \
        -L/usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-6 -L/usr/lib -L/usr/lib
-lgcc -lcygwin -lkernel32 -lgcc
Cannot export __imp_reent_data: symbol not defined
dll_init.o(.text+0x1):dll_init.c: undefined reference to `__imp_reent_data'
make: *** [libpari.dll] Error 1
rm libpari_dll.c libpari.exp libpari.def libpari_dll.o

# end attempt

At Wed, 7 Feb 2001 17:16:48 +0100 (MET), Gerhard Niklasch <nikl@mathematik.tu-
muenchen.de> wrote:

>
>In response to:
>> Message-Id: <200102071527.HAA18372@user5.hushmail.com>
>> From: hatrick@hushmail.com
>> Date: Wed, 7 Feb 2001 15:18:28 +0000 (GMT+00:00)
>
>> Cannot export __imp_reent_data: symbol not defined
>> dll_init.o(.text+0x1):dll_init.c: undefined reference to `__imp_reent_data'
>> Make[1]: *** [libpari.dll] Error 1
>
>Disclaimer: I know nothing at all about CygWin.
>
>However, pasting __imp_reent_data into www.google.com came up
>with the following:
>
>http://www.cygwin.com/ml/cygwin/2000-09/msg00812.html
>===8<---
>Using your suggestion, I changed the following in src/utils/dllinit.c:
>
>    extern struct _reent *__imp_reent_data;
>
>to:
>
>    extern __declspec(dllimport) struct _reent reent_data;
>
>and the '__imp_reent_data' undefined reference problem was solved.
>--->8===
>
>dllinit.c is built "on the fly" in a sequence of echo commands
>which come out of config/Makefile.DLLs, at the end:
>
>===8<---
># Windows requires each DLL to have an initialization function
># that is called at certain points (thread/process attach/detach).
># This one just initializes `_impure_ptr'.
>dll_init.c:
>        echo '#include <stdio.h>'                               > dll_init.c
>        echo 'extern struct _reent *_impure_ptr;'               >> dll_init.c
>        echo 'extern struct _reent *__imp_reent_data;'          >> dll_init.c
>        echo '__attribute__((stdcall))'                         >> dll_init.c
>        echo 'int dll_entry(int handle, int reason, void *ptr)' >> dll_init.c
>        echo '{ _impure_ptr=__imp_reent_data; return 1; }'      >> dll_init.c
>
># The following rule is just there to convince gcc
># to keep otherwise unused intermediate targets around.
>dont_throw_away: dll_fixup.o dll_init.o
>--->8===
>
>So you may try changing the third of these echo lines as indicated,
>and rebuild  (I guess you have to re-run the configure phase?).
>
>(Karim -- any idea whether this change won't break older cygwins?)
>
>Hope this helps,
>Gerhard
>

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