Support 64-bit double and 64-bit long double configurations.

gcc/
	Support 64-bit double and 64-bit long double configurations.

	PR target/92055
	* config.gcc (tm_defines) [avr]: Set from --with-double=,
	--with-long-double=.
	* config/avr/t-multilib: Remove.
	* config/avr/t-avr: Output of genmultilib.awk is now fully
	dynamically generated and no more part of the repo.
	(HAVE_DOUBLE_MULTILIB, HAVE_LONG_DOUBLE_MULTILIB): New variables.
	Pass them down to...
	* config/avr/genmultilib.awk: ...here and handle them.
	* gcc/config/avr/avr.opt (-mdouble=, avr_double). New option and var.
	(-mlong-double=, avr_long_double). New option and var.
	* common/config/avr/avr-common.c (opts.h, diagnostic.h): Include.
	(TARGET_OPTION_OPTIMIZATION_TABLE) <-mdouble=, -mlong-double=>:
	Set default as requested by --with-double=
	(TARGET_HANDLE_OPTION): Define to this...
	(avr_handle_option): ...new hook worker.
	* config/avr/avr.h (DOUBLE_TYPE_SIZE): Define to avr_double.
	(LONG_DOUBLE_TYPE_SIZE): Define to avr_long_double.
	(avr_double_lib): New proto for spec function.
	(EXTRA_SPEC_FUNCTIONS) <double-lib>: Add.
	(DRIVER_SELF_SPECS): Call %:double-lib.
	* config/avr/avr.c (avr_option_override): Assert
	sizeof(long double) >= sizeof(double) for the target.
	* config/avr/avr-c.c (avr_cpu_cpp_builtins)
	[__HAVE_DOUBLE_MULTILIB__, __HAVE_LONG_DOUBLE_MULTILIB__]
	[__HAVE_DOUBLE64__, __HAVE_DOUBLE32__, __DEFAULT_DOUBLE__=]
	[__HAVE_LONG_DOUBLE64__, __HAVE_LONG_DOUBLE32__]
	[__HAVE_LONG_DOUBLE_IS_DOUBLE__, __DEFAULT_LONG_DOUBLE__=]:
	New built-in define depending on --with-double=, --with-long-double=.
	* config/avr/driver-avr.c (avr_double_lib): New spec function.
	* doc/invoke.tex (AVR Options) <-mdouble=,-mlong-double=>: Doc.
	* doc/install.texi (Cross-Compiler-Specific Options)
	<--with-double=, --with-long-double=>: Doc.

libgcc/
	Support 64-bit double and 64-bit long double configurations.

	PR target/92055
	* config/avr/t-avr (HOST_LIBGCC2_CFLAGS): Only add -DF=SF if
	long double is a 32-bit type.
	* config/avr/t-avrlibc: Copy double64 and long-double64
	multilib(s) from the vanilla one.
	* config/avr/t-copy-libgcc: New Makefile snip.

From-SVN: r277908

3 files changed, 50 insertions, 2 deletions

diff --git a/libgcc/config/avr/t-avr b/libgcc/config/avr/t-avr
index c420c5d..e4f867b 100644
--- a/libgcc/config/avr/t-avr
+++ b/libgcc/config/avr/t-avr
@@ -112,10 +112,14 @@ LIB2FUNCS_EXCLUDE = \
 	_clrsbdi2 \
 
 
-# We do not have the DF type.
+ifeq ($(long_double_type_size),32)
+# We do not have the DFtype.
+HOST_LIBGCC2_CFLAGS += -DDF=SF
+endif
+
 # Most of the C functions in libgcc2 use almost all registers,
 # so use -mcall-prologues for smaller code size.
-HOST_LIBGCC2_CFLAGS += -DDF=SF -Dinhibit_libc -mcall-prologues -Os
+HOST_LIBGCC2_CFLAGS += -Dinhibit_libc -mcall-prologues -Os
 
 # Extra 16-bit integer functions.
 intfuncs16 = _absvXX2 _addvXX3 _subvXX3 _mulvXX3 _negvXX2 _clrsbXX2
diff --git a/libgcc/config/avr/t-avrlibc b/libgcc/config/avr/t-avrlibc
index d2c8b87..2424d66 100644
--- a/libgcc/config/avr/t-avrlibc
+++ b/libgcc/config/avr/t-avrlibc
@@ -64,3 +64,34 @@ LIB2FUNCS_EXCLUDE += \
 	_fixunssfsi _fixsfdi \
 	_fixunssfdi \
 	_floatdisf _floatundisf
+
+ifneq (,$(findstring avr,$(MULTISUBDIR)))
+
+# We are not in the avr2 (default) subdir, hence copying will work.
+# In default dir, copying won'twork because the default multilib is
+# built after all the others.
+
+ifneq (,$(findstring double64,$(MULTISUBDIR)))
+
+# We are in double64/libgcc or long-double64/libgcc:
+# Just copy from the [long ]double=float multilib; we would remove any DFmode
+# bits from this multilib variant, anyway, because the current assumption
+# is that avr-libc hosts *all* the IEEE-double stuff.
+
+LIB2FUNCS_EXCLUDE := %
+LIB1ASMFUNCS :=
+libgcc-objects :=
+libgcov-objects :=
+objects :=
+
+t-copy-libgcc.dep: $(srcdir)/config/avr/t-copy-libgcc
+	-rm -f libgcc.a
+	-rm -f libgcov.a
+	cp $< $@
+
+libgcc.a libgcov.a libgcc_tm.h: t-copy-libgcc.dep
+
+Makefile: t-copy-libgcc.dep
+
+endif
+endif
diff --git a/libgcc/config/avr/t-copy-libgcc b/libgcc/config/avr/t-copy-libgcc
new file mode 100644
index 0000000..d34cbde
--- /dev/null
+++ b/libgcc/config/avr/t-copy-libgcc
@@ -0,0 +1,13 @@
+# Only used with --with-avrlibc & (-mlong-double=64 | -mdouble=64)
+#
+# Inserted at the end of Makefile by magic[tm].
+# We need this *after* Makefile's rules so we can override them.
+
+libgcc.a: ../../libgcc/libgcc.a
+	cp $< $@
+
+libgcov.a: ../../libgcc/libgcov.a
+	@:
+ifeq ($(enable_gcov),yes)
+	cp $< $@
+endif