[power-iee128] How to specify linker flags

[Thomas Koenig <tkoenig@netcologne.de>]

Hi Michael,

> If you are building libraries that contain modules with multiple long double
> types, you must use the '-mno-gnu-attribute'.  We also use the '-Wno-psabi'
> option, which silences the warning that you are switching long double types (if
> glibc is not 2.34 or newer).  We may need to tweak -Wno-psabi for use with
> Fortran.

I am now at the point where the object files are also compiled correctly
for the gfortran specifics:

0000000000000000 <_gfortran_specific__abs_r17>:
    0:   09 00 43 f4     lxv     vs34,0(r3)
    4:   48 16 40 fc     xsabsqp v2,v2
    8:   20 00 80 4e     blr

However, the linker complains, as you said it would, about the different
formats:

/opt/at15.0/bin/ld: .libs/maxloc0_4_r16.o uses IBM long double, 
.libs/_abs_r17.o uses IEEE long double
/opt/at15.0/bin/ld: failed to merge target specific data of file 
.libs/_abs_r17.o

I know next to nothing about libtool, so I do not know how to
add the flags so the linker can find them.

Any pointers?

(I have not yet committed the changes because I do not want to
commit something that does not compile.  If anybody wants to
take a look, it's on the ieee128 virtual machine under
/home/tkoenig/ieee ).

Regards

	Thomas