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80bit double in libgcc

Hi, tech-toolchain.

Looking at libgcc, it seems that linux libgcc is built as follows:

$ cat /usr/src/external/gpl3/gcc/dist/libgcc/config/i386/t-linux
# On 64bit we do not need any exports for glibc for 64-bit libgcc_s.
# Need to support TImode for x86.  Override the settings from
# t-slibgcc-elf-ver and t-linux
SHLIB_MAPFILES = libgcc-std.ver $(srcdir)/config/i386/libgcc-glibc.ver

HOST_LIBGCC2_CFLAGS += -mlong-double-80

We also use 80bit long double, but not building libgcc that way.
man gcc warns this breaks compat.

Do we want to change any of this?


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