On Wed, 27 Nov 2019, Ryan Joseph via fpc-pascal wrote:
I'm trying to link to a static library (built from Python sources) in Pascal
and having troubles on Linux. On Mac where I have experience I successfully
link and every works as expected but on Linux I get slews of linker errors in
what appear to be standard C library functions.
For example:
/usr/bin/ld.bfd:
/home/chris/pas/PythonBridge-master/sources/libpython3.7m.a(bytearrayobject.o):
in function `memcpy':
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:34: undefined reference
to `memcpy'
/usr/bin/ld.bfd:
/home/chris/pas/PythonBridge-master/sources/libpython3.7m.a(typeobject.o): in
function `_PyType_Name':
/home/chris/Downloads/Python-3.7.4/Objects/typeobject.c:417: undefined
reference to `strrchr'
/usr/bin/ld.bfd: /home/chris/Downloads/Python-3.7.4/Objects/typeobject.c:107:
undefined reference to `strlen'
/usr/bin/ld.bfd: /home/chris/Downloads/Python-3.7.4/Objects/typeobject.c:108:
undefined reference to `strncmp'
/usr/bin/ld.bfd: /home/chris/Downloads/Python-3.7.4/Objects/typeobject.c:103:
undefined reference to `strrchr'
/usr/bin/ld.bfd: /home/chris/Downloads/Python-3.7.4/Objects/typeobject.c:107:
undefined reference to `strlen'
/usr/bin/ld.bfd: /home/chris/Downloads/Python-3.7.4/Objects/typeobject.c:108:
undefined reference to `strncmp'
Do I need to link to other system libraries when building on Linux? I'm
also confused because I thought the purpose of the static libraries was to
contain all the code they needed to run and thus these system functions
like "memcpy" would be present also. I used to same make command I did on
Mac to build the library but maybe I did something wrong on Linux.
The C library will not be in your custom-built library, but will be
referenced if it uses functions from libc.
You need to link to libc. So add a
{$linklib c}
and you should be set.
Michael.
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