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To:	cygwin AT cygwin DOT com
Subject:	Aw: Re: Recompilation problems opencv (python3-cv2 --> python3.8)
Date:	Thu, 14 Jan 2021 10:59:35 +0100
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From:	wilhelm-eger--- via Cygwin <cygwin AT cygwin DOT com>
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Dear Csaba,

Thank you for you reply.

However, it does not seem to work. I have tried several things. Based on this post:

https://stackoverflow.com/questions/38296756/what-is-the-idiomatic-way-in-cmake-to-add-the-fpic-compiler-option

I have added -DENABLE_PIC=ON to the cmake command of the cygport file from the git repository. Further, I have tried -DCMAKE_POSITION_INDEPENDENT_CODE=ON without success. Finally, I have tried to add -fPIC to the respective compilation commands in the build.ninja file for ittnotify and the linker command without any success.

This seems to be odd, as neither the cygport file nor the source code could have changed since this package has been compiled the last time for python36.

(And yes, I have searched the web for the respective phrase)

Any other hint? Thanks in advance.

Wilhelm 

Gesendet: Donnerstag, 14. Januar 2021 um 09:18 Uhr
Von: "Csaba Raduly" <rcsaba AT gmail DOT com>
An: wilhelm-eger AT web DOT de
Cc: "cygwin list" <cygwin AT cygwin DOT com>
Betreff: Re: Recompilation problems opencv (python3-cv2 --> python3.8)
Hi Wilhelm,

On Thu, 14 Jan 2021 at 08:10, wilhelm-eger--- via Cygwin
<cygwin AT cygwin DOT com> wrote:
(snip)
> 3rdparty/lib/libittnotify.a(ittnotify_static.c.o): in function `__itt_fini_ittlib':
> /usr/src/debug/opencv-3.4.1-2/3rdparty/ittnotify/src/ittnotify/ittnotify_static.c:1076:(.text$__itt_fini_ittlib+0x104): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `dlsym'
> 3rdparty/lib/libittnotify.a(ittnotify_static.c.o): in function `__itt_init_ittlib':
> /usr/src/debug/opencv-3.4.1-2/3rdparty/ittnotify/src/ittnotify/ittnotify_static.c:1123:(.text$__itt_init_ittlib+0x14b): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `dlopen'
> /usr/src/debug/opencv-3.4.1-2/3rdparty/ittnotify/src/ittnotify/ittnotify_static.c:1123:(.text$__itt_init_ittlib+0x155): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `dlsym'
> /usr/src/debug/opencv-3.4.1-2/3rdparty/ittnotify/src/ittnotify/ittnotify_static.c:1123:(.text$__itt_init_ittlib+0x168): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `dlclose'
> /usr/src/debug/opencv-3.4.1-2/3rdparty/ittnotify/src/ittnotify/ittnotify_static.c:1125:(.text$__itt_init_ittlib+0x2a6): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `dlopen'
> 3rdparty/lib/libittnotify.a(ittnotify_static.c.o): in function `__itt_lib_version':
> /usr/src/debug/opencv-3.4.1-2/3rdparty/ittnotify/src/ittnotify/ittnotify_static.c:1030:(.text$__itt_init_ittlib+0x2c8): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `dlsym'
> 3rdparty/lib/libittnotify.a(ittnotify_static.c.o): in function `__itt_init_ittlib':
> /usr/src/debug/opencv-3.4.1-2/3rdparty/ittnotify/src/ittnotify/ittnotify_static.c:1179:(.text$__itt_init_ittlib+0x2e4): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `dlsym'
> 3rdparty/lib/libittnotify.a(ittnotify_static.c.o): in function `__itt_lib_version':
> /usr/src/debug/opencv-3.4.1-2/3rdparty/ittnotify/src/ittnotify/ittnotify_static.c:1032:(.text$__itt_init_ittlib+0x3c6): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `dlsym'
> 3rdparty/lib/libittnotify.a(ittnotify_static.c.o): in function `__itt_init_ittlib':
> /usr/src/debug/opencv-3.4.1-2/3rdparty/ittnotify/src/ittnotify/ittnotify_static.c:1141:(.text$__itt_init_ittlib+0x41c): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `dlsym'

You need to compile with -fPIC.
Did you try searching the Internet for "relocation truncated to fit:
R_X86_64_PC32 against undefined symbol" ?

Csaba
--
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