[patch,avr, 2/3] Support 64-bit (long) double: The libgcc changes.

[Georg-Johann Lay]

Am 16.12.19 um 17:40 schrieb Georg-Johann Lay:

Patch 2/3 is the libgcc additions:

--with-libf7 selects which makefile-snips from libf7 to use.

libgcc/
	* config.host (tmake_file) [target=avr]: Add t-libf7,
	t-libf7-math, t-libf7-math-symbols as specified by --with-libf7=.
	* config/avr/t-avrlibc: Don't copy libgcc.a if there are modules
	depending on sizeof (double) or sizeof (long double).
	* config/avr/libf7: New folder.
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