Ubuntu 20.10 build of 9.3beta1 failing on fplll

[Kiran Kedlaya]

I'm trying to build Sage 9.3beta1 on my Ubuntu 20.10 laptop, and the build is failing in fplll-5.3.3. The relevant lines seem to be

[fplll-5.3.3] /usr/bin/ld: /usr/local/lib/libqd.a(dd_const.o): warning: relocation against `_ZN7dd_real4_pi4E' in read-only section `.text.startup'

[fplll-5.3.3] /usr/bin/ld: /usr/local/lib/libqd.a(dd_real.o): relocation R_X86_64_PC32 against symbol `_ZSt4cerr@@GLIBCXX_3.4' can not be used when making a shared object; recompile with -fPIC

I can include a more detailed log if needed, but let's see if this is already enough to generate some suggestions...

Kiran

[Dima Pasechnik]

perhaps you have some stale libraries in /usr/local/lib/ ?
On Ubuntu one should be able to use libqd from the system.

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> Kiran
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[Isuru Fernando]

Sage should probably add --without-qd to https://github.com/sagemath/sage/blob/9.3.beta1/build/pkgs/fplll/spkg-install.in#L30



Isuru


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[François Bissey]

libqd.a in your /usr/local/lib folder has been compiled without -fPIC and cannot
be used to build a shared library.
As stated by Dima, you shouldn’t need to install your own. If you insist on using
a libqd from /usr/local/lib, install one compiled with -fPIC.

François

[Kiran Kedlaya]

Removing /usr/local/lib/libqd.a indeed took care of the issue. Thanks!

Kiran