[PATCH, RFC] Enable IBM long double for PPC32 Linux

[Jakub Jelinek]

On Mon, Jan 23, 2006 at 11:56:14AM -0500, David Edelsohn wrote:
> 	The appended patch implements this proposal and we would like to
> include it in mainline and GCC 4.1.

I believe in addition to this patch we need to make sure ppc-linux
(as well as ppc64-linux -m32) libgcc is compiled with -mlong-double-128,
to export all the needed TFmode exports.  Haven't tried your patch yet,
but saw similar problem on sparc32 a few days ago (though there it will
be harder to solve, as we have an chicken-and-egg issue).

rs6000/t-linux64 does that for ppc64-linux -m64 already:
TARGET_LIBGCC2_CFLAGS = -mno-minimal-toc -fPIC -specs=bispecs
...
# Hack to use -mlong-double-128 just for compiling 64 bit libgcc
mklibgcc: bispecs

bispecs: specs
        if [ x$(GCC_FOR_TARGET) -print-multi-os-directory = x../lib ]; then \
          sed -e '/cc1_options/{ n; s/$$/ %{m64:-mlong-double-128}/; }' < specs > $@; \
        else \
          sed -e '/cc1_options/{ n; s/$$/ %{!m32:-mlong-double-128}/; }' < specs > $@; \
        fi

I'd say we should just change that to:
TARGET_LIBGCC2_CFLAGS = -mno-minimal-toc -fPIC -mlong-double-128
and
get rid of the rest (and need also
TARGET_LIBGCC2_CFLAGS = -fPIC -mlong-double-128
in newly created rs6000/t-linux).

	Jakub