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Date:	Thu, 14 Jan 2021 09:18:30 +0100
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Subject:	Re: Recompilation problems opencv (python3-cv2 --> python3.8)
To:	wilhelm-eger AT web DOT de
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From:	Csaba Raduly via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Csaba Raduly <rcsaba AT gmail DOT com>
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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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by not doing the right thing. - Scott Meyers, An Effective C++11/14 Sampler
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