https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120762
Bug ID: 120762
Summary: PRINT: issue activating "Q" print format specifier
[solved]
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libquadmath
Assignee: unassigned at gcc dot gnu.org
Reporter: newbie-02 at gmx dot de
Target Milestone: ---
I had an issue with quadmath printing nonsense like
%Qg
%.36QE
instead of the values intended.
It turned out that on my system ( Linux - Debian - Kali ) the
library sometimes isn't linked in when no quadmath calculations
are performed and only the printing system / printf hooks are
to be used.
Similar happened with "lipdfp", decimal math, and a hint by
Andrew Pinski in
https://github.com/libdfp/libdfp/issues/186#issuecomment-2957037007solved
unveiled it as a consequence of gcc defaulting to "--as-needed"
linking on Debian / ubuntu systems, and using "-Wl,--no-as-needed"
as option before the source and target files in the compile
command can oversteer.
I tried and the same works for quadmath.
Posted to A.) spread the word ( before Andrew's comment I
couldn't find any hint online ), B.) propose to change the
behaviour, IMHO using the print format specifier in code should
activate "library is needed".
