+2019-11-07 Georg-Johann Lay <avr@gjlay.de>
+
+ 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.
+
2019-11-07 Richard Biener <rguenther@suse.de>
* dbgcnt.def (gimple_unroll): New.
#include "tm.h"
#include "common/common-target.h"
#include "common/common-target-def.h"
+#include "opts.h"
+#include "diagnostic.h"
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options avr_option_optimization_table[] =
performance decrease. For the AVR though, disallowing data races
introduces additional code in LIM and increases reg pressure. */
{ OPT_LEVELS_ALL, OPT_fallow_store_data_races, NULL, 1 },
+
+#if defined (WITH_DOUBLE64)
+ { OPT_LEVELS_ALL, OPT_mdouble_, NULL, 64 },
+#elif defined (WITH_DOUBLE32)
+ { OPT_LEVELS_ALL, OPT_mdouble_, NULL, 32 },
+#else
+#error "align this with config.gcc"
+#endif
+
+#if defined (WITH_LONG_DOUBLE64)
+ { OPT_LEVELS_ALL, OPT_mlong_double_, NULL, 64 },
+#elif defined (WITH_LONG_DOUBLE32)
+ { OPT_LEVELS_ALL, OPT_mlong_double_, NULL, 32 },
+#else
+#error "align this with config.gcc"
+#endif
+
{ OPT_LEVELS_NONE, 0, NULL, 0 }
};
+
+/* Implement `TARGET_HANDLE_OPTION'. */
+
+/* This is the same logic that driver-avr.c:avr_double_lib() applies
+ during DRIVER_SELF_SPECS, but this time we complain about -mdouble=
+ and -mlong-double= that are not provided by --with-double= resp.
+ --with-long-double= */
+
+static bool
+avr_handle_option (struct gcc_options *opts, struct gcc_options*,
+ const struct cl_decoded_option *decoded, location_t loc)
+{
+ int value = decoded->value;
+
+ switch (decoded->opt_index)
+ {
+ case OPT_mdouble_:
+ if (value == 64)
+ {
+#if !defined (HAVE_DOUBLE64)
+ error_at (loc, "option %<-mdouble=64%> is only available if "
+ "configured %<--with-double={64|64,32|32,64}%>");
+#endif
+ opts->x_avr_long_double = 64;
+ }
+ else if (value == 32)
+ {
+#if !defined (HAVE_DOUBLE32)
+ error_at (loc, "option %<-mdouble=32%> is only available if "
+ "configured %<--with-double={|32|32,64|64,32}%>");
+#endif
+ }
+ else
+ gcc_unreachable();
+
+#if defined (HAVE_LONG_DOUBLE_IS_DOUBLE)
+ opts->x_avr_long_double = value;
+#endif
+ break; // -mdouble=
+
+ case OPT_mlong_double_:
+ if (value == 64)
+ {
+#if !defined (HAVE_LONG_DOUBLE64)
+ error_at (loc, "option %<-mlong-double=64%> is only available if "
+ "configured %<--with-long-double={64|64,32|32,64}%>, "
+ "or %<--with-long-double=double%> together with "
+ "%<--with-double={64|64,32|32,64}%>");
+#endif
+ }
+ else if (value == 32)
+ {
+#if !defined (HAVE_LONG_DOUBLE32)
+ error_at (loc, "option %<-mlong-double=32%> is only available if "
+ "configured %<--with-long-double={|32|32,64|64,32}%>, "
+ "or %<--with-long-double=double%> together with "
+ "%<--with-double={|32|32,64|64,32}%>");
+#endif
+ opts->x_avr_double = 32;
+ }
+ else
+ gcc_unreachable();
+
+#if defined (HAVE_LONG_DOUBLE_IS_DOUBLE)
+ opts->x_avr_double = value;
+#endif
+ break; // -mlong-double=
+ }
+
+ return true;
+}
+
+
+#undef TARGET_HANDLE_OPTION
+#define TARGET_HANDLE_OPTION avr_handle_option
+
#undef TARGET_OPTION_OPTIMIZATION_TABLE
#define TARGET_OPTION_OPTIMIZATION_TABLE avr_option_optimization_table
tm_file="${tm_file} ${cpu_type}/avrlibc.h"
tm_defines="${tm_defines} WITH_AVRLIBC"
fi
+ case y${with_double} in
+ y | y32)
+ avr_double=32
+ tm_defines="${tm_defines} HAVE_DOUBLE32"
+ ;;
+ y64)
+ avr_double=64
+ tm_defines="${tm_defines} HAVE_DOUBLE64"
+ ;;
+ y64,32)
+ avr_double=64
+ avr_double_multilib=1
+ tm_defines="${tm_defines} HAVE_DOUBLE32"
+ tm_defines="${tm_defines} HAVE_DOUBLE64"
+ tm_defines="${tm_defines} HAVE_DOUBLE_MULTILIB"
+ ;;
+ y32,64)
+ avr_double=32
+ avr_double_multilib=1
+ tm_defines="${tm_defines} HAVE_DOUBLE32"
+ tm_defines="${tm_defines} HAVE_DOUBLE64"
+ tm_defines="${tm_defines} HAVE_DOUBLE_MULTILIB"
+ ;;
+ *)
+ echo "Error: --with-double= can only be used with: '32', '32,64', '64,32', '64'" 1>&2
+ exit 1
+ ;;
+ esac
+ case y${with_long_double} in
+ y | y32)
+ avr_long_double=32
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE32"
+ ;;
+ y64)
+ avr_long_double=64
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE64"
+ ;;
+ y64,32)
+ avr_long_double=64
+ avr_long_double_multilib=1
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE32"
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE64"
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE_MULTILIB"
+ ;;
+ y32,64)
+ avr_long_double=32
+ avr_long_double_multilib=1
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE32"
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE64"
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE_MULTILIB"
+ ;;
+ ydouble)
+ avr_long_double=${avr_double}
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE_IS_DOUBLE"
+ if test y${avr_double_multilib} = y1; then
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE32"
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE64"
+ else
+ tm_defines="${tm_defines} HAVE_LONG_DOUBLE${avr_long_double}"
+ fi
+ ;;
+ *)
+ echo "Error: --with-long_double= can only be used with: '32', '32,64', '64,32', '64', 'double'" 1>&2
+ exit 1
+ ;;
+ esac
+ if test ${avr_long_double}x${avr_long_double_multilib}y${avr_double_multilib}z = 32xy1z; then
+ if test y${with_long_double} != ydouble; then
+ echo "Error: --with-double=${with_double} requests a multilib for double, but long double is always 32 bits wide due to --with-long-double=${with_long_double}" 1>&2
+ exit 1
+ fi
+ fi
+ if test ${avr_double}x${avr_long_double_multilib}y${avr_double_multilib}z = 64x1yz; then
+ echo "Error: --with-long-double=${with_long_double} requests a multilib for long double, but double is always 64 bits wide due to --with-double=64" 1>&2
+ exit 1
+ fi
+ if test y${avr_double}${avr_long_double} = y6432; then
+ echo "Error: double default of 64 bits from --with-double=${with_double} conflicts with default of 32 bits for long double from --with-long-double=${with_long_double}" 1>&2
+ exit 1
+ fi
+ tm_defines="${tm_defines} WITH_DOUBLE${avr_double}"
+ tm_defines="${tm_defines} WITH_LONG_DOUBLE${avr_long_double}"
tmake_file="${tmake_file} avr/t-avr avr/t-multilib"
use_gcc_stdint=wrap
extra_gcc_objs="driver-avr.o avr-devices.o"
cpp_define (pfile, "__WITH_AVRLIBC__");
#endif /* WITH_AVRLIBC */
+ // From configure --with-double={|32|32,64|64,32|64}
+
+#ifdef HAVE_DOUBLE_MULTILIB
+ cpp_define (pfile, "__HAVE_DOUBLE_MULTILIB__");
+#endif
+
+#ifdef HAVE_DOUBLE64
+ cpp_define (pfile, "__HAVE_DOUBLE64__");
+#endif
+
+#ifdef HAVE_DOUBLE32
+ cpp_define (pfile, "__HAVE_DOUBLE32__");
+#endif
+
+#if defined (WITH_DOUBLE64)
+ cpp_define (pfile, "__DEFAULT_DOUBLE__=64");
+#elif defined (WITH_DOUBLE32)
+ cpp_define (pfile, "__DEFAULT_DOUBLE__=32");
+#else
+#error "align this with config.gcc"
+#endif
+
+ // From configure --with-long-double={|32|32,64|64,32|64|double}
+
+#ifdef HAVE_LONG_DOUBLE_MULTILIB
+ cpp_define (pfile, "__HAVE_LONG_DOUBLE_MULTILIB__");
+#endif
+
+#ifdef HAVE_LONG_DOUBLE64
+ cpp_define (pfile, "__HAVE_LONG_DOUBLE64__");
+#endif
+
+#ifdef HAVE_LONG_DOUBLE32
+ cpp_define (pfile, "__HAVE_LONG_DOUBLE32__");
+#endif
+
+#ifdef HAVE_LONG_DOUBLE_IS_DOUBLE
+ cpp_define (pfile, "__HAVE_LONG_DOUBLE_IS_DOUBLE__");
+#endif
+
+#if defined (WITH_LONG_DOUBLE64)
+ cpp_define (pfile, "__DEFAULT_LONG_DOUBLE__=64");
+#elif defined (WITH_LONG_DOUBLE32)
+ cpp_define (pfile, "__DEFAULT_LONG_DOUBLE__=32");
+#else
+#error "align this with config.gcc"
+#endif
+
+
/* Define builtin macros so that the user can easily query whether
non-generic address spaces (and which) are supported or not.
This is only supported for C. For C++, a language extension is needed
if (!avr_set_core_architecture())
return;
+ /* Sould be set by avr-common.c */
+ gcc_assert (avr_long_double >= avr_double && avr_double >= 32);
+
/* RAM addresses of some SFRs common to all devices in respective arch. */
/* SREG: Status Register containing flags like I (global IRQ) */
#define LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 16 : 32)
#define LONG_LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 32 : 64)
#define FLOAT_TYPE_SIZE 32
-#define DOUBLE_TYPE_SIZE 32
-#define LONG_DOUBLE_TYPE_SIZE 32
+#define DOUBLE_TYPE_SIZE (avr_double)
+#define LONG_DOUBLE_TYPE_SIZE (avr_long_double)
+
#define LONG_LONG_ACCUM_TYPE_SIZE 64
#define DEFAULT_SIGNED_CHAR 1
(LENGTH = avr_adjust_insn_length (INSN, LENGTH))
extern const char *avr_devicespecs_file (int, const char**);
+extern const char *avr_double_lib (int, const char**);
-#define EXTRA_SPEC_FUNCTIONS \
+#define EXTRA_SPEC_FUNCTIONS \
+ { "double-lib", avr_double_lib }, \
{ "device-specs-file", avr_devicespecs_file },
/* Driver self specs has lmited functionality w.r.t. '%s' for dynamic specs.
is used to diagnose problems with reading the specs file. */
#undef DRIVER_SELF_SPECS
-#define DRIVER_SELF_SPECS \
+#define DRIVER_SELF_SPECS \
+ " %:double-lib(%{m*:m%*})" \
" %:device-specs-file(device-specs%s %{mmcu=*:%*})"
/* No libstdc++ for now. Empty string doesn't work. */
Target Report Mask(ABSDATA)
Assume that all data in static storage can be accessed by LDS / STS. This option is only useful for reduced Tiny devices.
+mdouble=
+Target Report Joined RejectNegative Var(avr_double) Init(0) Enum(avr_bits_e)
+mdouble=<BITS> Use <BITS> bits wide double type.
+
+mlong-double=
+Target Report Joined RejectNegative Var(avr_long_double) Init(0) Enum(avr_bits_e)
+mlong-double=<BITS> Use <BITS> bits wide long double type.
+
nodevicelib
Driver Target Report RejectNegative
Do not link against the device-specific library lib<MCU>.a.
+
+Enum
+Name(avr_bits_e) Type(int)
+Available BITS selections:
+
+EnumValue
+Enum(avr_bits_e) String(32) Value(32)
+
+EnumValue
+Enum(avr_bits_e) String(64) Value(64)
#endif
NULL);
}
+
+
+/* Re-build the -mdouble= and -mlong-double= options. This is needed
+ because multilib selection is based on the physical presence of an
+ option on the command line, which is not the case for, say, when the
+ double=64 multilib is to be selected by --with-double=64 but the user
+ does not specify -mdouble=64 explicitly. */
+
+const char*
+avr_double_lib (int argc, const char **argv)
+{
+#if defined (WITH_DOUBLE64)
+ int dbl = 64;
+#elif defined (WITH_DOUBLE32)
+ int dbl = 32;
+#else
+#error "align this with config.gcc"
+#endif
+
+#if defined (WITH_LONG_DOUBLE64)
+ int ldb = 64;
+#elif defined (WITH_LONG_DOUBLE32)
+ int ldb = 32;
+#else
+#error "align this with config.gcc"
+#endif
+
+ for (int i = 0; i < argc; i++)
+ {
+ if (strcmp (argv[i], "mdouble=32") == 0)
+ {
+ dbl = 32;
+#ifdef HAVE_LONG_DOUBLE_IS_DOUBLE
+ ldb = dbl;
+#endif
+ }
+ else if (strcmp (argv[i], "mdouble=64") == 0)
+ {
+ ldb = dbl = 64;
+ }
+ else if (strcmp (argv[i], "mlong-double=32") == 0)
+ {
+ ldb = dbl = 32;
+ }
+ else if (strcmp (argv[i], "mlong-double=64") == 0)
+ {
+ ldb = 64;
+#ifdef HAVE_LONG_DOUBLE_IS_DOUBLE
+ dbl = ldb;
+#endif
+ }
+ }
+
+ return concat (" %<mdouble=* -mdouble=", dbl == 32 ? "32" : "64",
+ " %<mlong-double=* -mlong-double=", ldb == 32 ? "32" : "64",
+ NULL);
+}
dir_rcall = "short-calls"
opt_rcall = "mshort-calls"
+ dir_double64 = "double64"
+ opt_double64 = "mdouble=64"
+
+ dir_long_double64 = "long-double64"
+ opt_long_double64 = "mlong-double=64"
+
# awk Variable Makefile Variable
# ------------------------------------------
# m_options <-> MULTILIB_OPTIONS
# m_dirnames <-> MULTILIB_DIRNAMES
# m_required <-> MULTILIB_REQUIRED
+ # m_reuse <-> MULTILIB_REUSE
m_sep = ""
m_options = "\nMULTILIB_OPTIONS = "
m_dirnames = "\nMULTILIB_DIRNAMES ="
m_required = "\nMULTILIB_REQUIRED ="
+ m_reuse = "\nMULTILIB_REUSE ="
+
+ have_double_multi = (HAVE_DOUBLE_MULTILIB == "HAVE_DOUBLE_MULTILIB")
+ have_long_double_multi = (HAVE_LONG_DOUBLE_MULTILIB == "HAVE_LONG_DOUBLE_MULTILIB")
}
##################################################################
# leading "mmcu=avr2/" in order not to confuse genmultilib.
gsub (/^mmcu=avr2\//, "", opts)
if (opts != "mmcu=avr2")
+ {
m_required = m_required " \\\n\t" opts
+ if (have_double_multi && have_long_double_multi)
+ {
+ m_required = m_required " \\\n\t" opts "/" opt_double64
+ m_required = m_required " \\\n\t" opts "/" opt_long_double64
+
+ # -mlong-double=64 -mdouble=64 is the same as -mdouble=64,
+ # hence add a respective reuse.
+ d_opts = opts "/" opt_double64
+ d_reuse = opts "/" opt_double64 "/" opt_long_double64
+ gsub (/=/, ".", d_opts)
+ gsub (/=/, ".", d_reuse)
+ m_reuse = m_reuse " \\\n\t" d_opts "=" d_reuse
+ }
+ else if (have_double_multi)
+ m_required = m_required " \\\n\t" opts "/" opt_double64
+ else if (have_long_double_multi)
+ m_required = m_required " \\\n\t" opts "/" opt_long_double64
+ }
}
}
# Output that Stuff
############################################################
- # Intended Target: ./gcc/config/avr/t-multilib
+ # Intended Target: $(top_builddir)/gcc/t-multilib-avr
+
+ if (have_double_multi && have_long_double_multi)
+ {
+ print m_options " " opt_tiny " " opt_rcall " " opt_double64 "/" opt_long_double64
+ print m_dirnames " " dir_tiny " " dir_rcall " " dir_double64 " " dir_long_double64
+ # Notice that the ./double64 and ./long-double64 variants cannot
+ # be copied by t-avrlibc because the . default multilib is built
+ # after all the others.
+ m_required = m_required " \\\n\t" opt_double64
+ m_required = m_required " \\\n\t" opt_long_double64
+ m_reuse = m_reuse " \\\n\tmdouble.64=mdouble.64/mlong-double.64"
+ }
+ else if (have_double_multi)
+ {
+ print m_options " " opt_tiny " " opt_rcall " " opt_double64
+ print m_dirnames " " dir_tiny " " dir_rcall " " dir_double64
+ m_required = m_required " \\\n\t" opt_double64
+ }
+ else if (have_long_double_multi)
+ {
+ print m_options " " opt_tiny " " opt_rcall " " opt_long_double64
+ print m_dirnames " " dir_tiny " " dir_rcall " " dir_long_double64
+ m_required = m_required " \\\n\t" opt_long_double64
+ }
+ else
+ {
+ print m_options " " opt_tiny " " opt_rcall
+ print m_dirnames " " dir_tiny " " dir_rcall
+ }
- print m_options " " opt_tiny " " opt_rcall
- print m_dirnames " " dir_tiny " " dir_rcall
print m_required
+ print m_reuse
}
# along with GCC; see the file COPYING3. If not see
# <http://www.gnu.org/licenses/>.
+HAVE_DOUBLE_MULTILIB = $(findstring HAVE_DOUBLE_MULTILIB, $(tm_defines))
+HAVE_LONG_DOUBLE_MULTILIB = $(findstring HAVE_LONG_DOUBLE_MULTILIB, $(tm_defines))
+
PASSES_EXTRA += $(srcdir)/config/avr/avr-passes.def
driver-avr.o: $(srcdir)/config/avr/driver-avr.c \
# MULTILIB_OPTIONS
# MULTILIB_DIRNAMES
# MULTILIB_REQUIRED
+# MULTILIB_REUSE
-s-mlib: $(srcdir)/config/avr/t-multilib
+multilib.h Makefile s-mlib: t-multilib-avr
-$(srcdir)/config/avr/t-multilib: $(srcdir)/config/avr/genmultilib.awk \
+t-multilib-avr: $(srcdir)/config/avr/genmultilib.awk \
$(AVR_MCUS)
- $(AWK) -f $< $< $(AVR_MCUS) > $@
+ $(AWK) -v HAVE_DOUBLE_MULTILIB=$(HAVE_DOUBLE_MULTILIB) \
+ -v HAVE_LONG_DOUBLE_MULTILIB=$(HAVE_LONG_DOUBLE_MULTILIB) \
+ -f $< $< $(AVR_MCUS) > $@
+
+include t-multilib-avr
+++ /dev/null
-# Auto-generated Makefile Snip
-# Generated by : ./gcc/config/avr/genmultilib.awk
-# Generated from : ./gcc/config/avr/avr-mcus.def
-# Used by : tmake_file from Makefile and genmultilib
-
-# Copyright (C) 2011-2019 Free Software Foundation, Inc.
-#
-# This file is part of GCC.
-#
-# GCC is free software; you can redistribute it and/or modify it under
-# the terms of the GNU General Public License as published by the Free
-# Software Foundation; either version 3, or (at your option) any later
-# version.
-#
-# GCC is distributed in the hope that it will be useful, but WITHOUT ANY
-# WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-# for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with GCC; see the file COPYING3. If not see
-# <http://www.gnu.org/licenses/>.
-
-MULTILIB_OPTIONS = mmcu=avr2/mmcu=avr25/mmcu=avr3/mmcu=avr31/mmcu=avr35/mmcu=avr4/mmcu=avr5/mmcu=avr51/mmcu=avr6/mmcu=avrxmega2/mmcu=avrxmega3/mmcu=avrxmega4/mmcu=avrxmega5/mmcu=avrxmega6/mmcu=avrxmega7/mmcu=avrtiny msp8 mshort-calls
-
-MULTILIB_DIRNAMES = avr2 avr25 avr3 avr31 avr35 avr4 avr5 avr51 avr6 avrxmega2 avrxmega3 avrxmega4 avrxmega5 avrxmega6 avrxmega7 avrtiny tiny-stack short-calls
-
-MULTILIB_REQUIRED = \
- msp8 \
- mmcu=avr25 \
- mmcu=avr25/msp8 \
- mmcu=avr3 \
- mmcu=avr31 \
- mmcu=avr35 \
- mmcu=avr4 \
- mmcu=avr5 \
- mmcu=avr51 \
- mmcu=avr6 \
- mmcu=avrxmega2 \
- mmcu=avrxmega3/mshort-calls \
- mmcu=avrxmega3 \
- mmcu=avrxmega4 \
- mmcu=avrxmega5 \
- mmcu=avrxmega6 \
- mmcu=avrxmega7 \
- mmcu=avrtiny
omitted from @file{libgcc.a} on the assumption that it will be provided by
@samp{newlib}.
+@html
+<a name="avr"></a>
+@end html
@item --with-avrlibc
-Specifies that @samp{AVR-Libc} is
-being used as the target C library. This causes float support
+Only supported for the AVR target. Specifies that @samp{AVR-Libc} is
+being used as the target C@tie{} library. This causes float support
functions like @code{__addsf3} to be omitted from @file{libgcc.a} on
the assumption that it will be provided by @file{libm.a}. For more
technical details, cf. @uref{http://gcc.gnu.org/PR54461,,PR54461}.
-This option is only supported for the AVR target. It is not supported for
+It is not supported for
RTEMS configurations, which currently use newlib. The option is
supported since version 4.7.2 and is the default in 4.8.0 and newer.
+@item --with-double=@{32|64|32,64|64,32@}
+@itemx --with-long-double=@{32|64|32,64|64,32|double@}
+Only supported for the AVR target since version@tie{}10.
+Specify the default layout available for the C/C++ @samp{double}
+and @samp{long double} type, respectively. The following rules apply:
+@itemize
+@item
+The first value after the @samp{=} specifies the default layout (in bits)
+of the type and also the default for the @option{-mdouble=} resp.
+@option{-mlong-double=} compiler option.
+@item
+If more than one value is specified, respective multilib variants are
+available, and @option{-mdouble=} resp. @option{-mlong-double=} acts
+as a multilib option.
+@item
+If @option{--with-long-double=double} is specified, @samp{double} and
+@samp{long double} will have the same layout.
+@item
+If the configure option is not set, it defaults to @samp{32} which
+is compatible with older versions of the compiler that use non-standard
+32-bit types for @samp{double} and @samp{long double}.
+@end itemize
+Not all combinations of @option{--with-double=} and
+@option{--with-long-double=} are valid. For example, the combination
+@option{--with-double=32,64} @option{--with-long-double=32} will be
+rejected because the first option specifies the availability of
+multilibs for @samp{double}, whereas the second option implies
+that @samp{long double} --- and hence also @samp{double} --- is always
+32@tie{}bits wide.
+
@item --with-nds32-lib=@var{library}
Specifies that @var{library} setting is used for building @file{libgcc.a}.
Currently, the valid @var{library} is @samp{newlib} or @samp{mculib}.
@gccoptlist{-mmcu=@var{mcu} -mabsdata -maccumulate-args @gol
-mbranch-cost=@var{cost} @gol
-mcall-prologues -mgas-isr-prologues -mint8 @gol
+-mdouble=@var{bits} -mlong-double=@var{bits} @gol
-mn_flash=@var{size} -mno-interrupts @gol
-mmain-is-OS_task -mrelax -mrmw -mstrict-X -mtiny-stack @gol
-mfract-convert-truncate @gol
Functions prologues/epilogues are expanded as calls to appropriate
subroutines. Code size is smaller.
+@item -mdouble=@var{bits}
+@itemx -mlong-double=@var{bits}
+@opindex mdouble
+@opindex mlong-double
+Set the size (in bits) of the @code{double} or @code{long double} type,
+respectively. Possible values for @var{bits} are 32 an 64.
+Whether or not a specific value for @var{bits} is allowed depends on
+the @code{--with--double=} and @code{--with-long-double=}
+@w{@uref{https://gcc.gnu.org/install/configure.html#avr,configure options}},
+and the same applies for the default values of the options.
+
@item -mgas-isr-prologues
@opindex mgas-isr-prologues
Interrupt service routines (ISRs) may use the @code{__gcc_isr} pseudo
+2019-11-07 Georg-Johann Lay <avr@gjlay.de>
+
+ 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.
+
2019-11-04 Jozef Lawrynowicz <jozef.l@mittosystems.com>
* crtstuff.c: Define USE_TM_CLONE_REGISTRY to 0 if it's undefined and
tmake_file="$tmake_file ${cpu_type}/t-avrlibc"
fi
tm_file="$tm_file avr/avr-lib.h"
+ if test x${with_fixed_point} = xno; then
+ fixed_point=no
+ fi
;;
bfin*-elf*)
tmake_file="bfin/t-bfin bfin/t-crtlibid bfin/t-crtstuff t-libgcc-pic t-fdpbit"
_clrsbdi2 \
-# We do not have the DF type.
+ifeq ($(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
_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
--- /dev/null
+# 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
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