Re: library .tbss mismatches

[Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>]

On Thu, May 11, 2023 at 09:05:41PM -0500, Greg Marks wrote:
> On a computer on which, years ago, I installed Pari-GP both from the
> source tarball and from the Debian Linux repositories, I am unable to
> compile C programs such as the extgcd.c program in the Pari examples.
> I get these errors:
> 
> $gcc -Wall -O3 -o extgcd extgcd.c -lpari
> /usr/bin/ld: PARI_SIGINT_block: TLS definition in /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libpari.so section .tbss mismatches non-TLS reference in /tmp/ccQUa8Wh.o
> /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libpari.so: error adding symbols: bad value
> collect2: error: ld returned 1 exit status

Hello Greg,

This error is caused by a mismatch between the library and the header files. 
you are using /usr/lib/libpari.so, so you need to use the headers files
in /usr/include.

Probably you have a copy of the old headers in /usr/local/include/pari
(and probably other PARI files in /usr/local)

you can do 
find / -name pari.h
to find old pari.h files

note: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libpari.so is actually
/usr/lib/libpari.so which is the version provided by Debian.

the files /usr/lib/x86_64-linux-gnu/libpari.so and /usr/include/x86_64-linux-gnu/pari/pari.h are
in the libpari-dev Debian package.

Now if you want to compile PARI by yourself, you need set --prefix to some directory
in Configure, do 'make install' and then set -I and -L to that directory in gcc.
See examples/Makefile and examples/EXPLAIN

If you are unsure follow the installation instruction, page 8.
<https://pari.math.u-bordeaux.fr/Events/PARIday2021/talks/sources.pdf>
cd to examples and do
make TARGET=extgcd

Cheers,
Bill