145 lines
5.3 KiB
Plaintext
145 lines
5.3 KiB
Plaintext
# Copyright (C) 2006-2020 Free Software Foundation, Inc.
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# This file is part of GCC.
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# GCC is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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# GCC is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with GCC; see the file COPYING3. If not see
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# <http://www.gnu.org/licenses/>.
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# Targets using soft-fp should define the following variables:
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#
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# softfp_float_modes: a list of soft-float floating-point modes,
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# e.g. sf df
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# softfp_int_modes: a list of integer modes for which to define conversions,
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# e.g. si di
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# softfp_extensions: a list of extensions between floating-point modes,
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# e.g. sfdf
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# softfp_truncations: a list of truncations between floating-point modes,
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# e.g. dfsf
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#
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# Extensions and truncations should include those where only one mode
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# is a soft-float mode; for example, sftf where sf is hard-float and
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# tf is soft-float.
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#
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# If some additional functions should be built that are not implied by
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# the above settings, also define softfp_extras as a list of those
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# functions, e.g. unorddf2.
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#
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# If the functions should only be built as compat symbols for shared
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# libgcc, not available for new links, also define:
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#
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# softfp_compat := y
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#
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# If the libgcc2.c functions should not be replaced, also define:
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#
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# softfp_exclude_libgcc2 := y
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#
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# Avoiding replacing the libgcc2.c functions is a temporary measure
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# for targets with both hard-float and soft-float multilibs, since
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# these variables apply for all multilibs. With toplevel libgcc,
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# soft-fp can be used conditionally on the multilib instead.
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#
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# If the code should not be compiled at all for some multilibs, define:
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#
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# softfp_wrap_start: text to put at the start of wrapper source files,
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# output with echo
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# e.g. '#ifndef __powerpc64__'
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# softfp_wrap_end: text to put at the end of wrapper source files,
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# e.g. '#endif'
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#
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# This is another temporary measure, and cannot be used together with
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# softfp_compat.
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softfp_float_funcs = add$(m)3 div$(m)3 eq$(m)2 ge$(m)2 le$(m)2 mul$(m)3 \
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neg$(m)2 sub$(m)3 unord$(m)2
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softfp_floatint_funcs = fix$(m)$(i) fixuns$(m)$(i) \
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float$(i)$(m) floatun$(i)$(m)
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softfp_func_list := \
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$(foreach m,$(softfp_float_modes), \
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$(softfp_float_funcs) \
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$(foreach i,$(softfp_int_modes), \
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$(softfp_floatint_funcs))) \
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$(foreach e,$(softfp_extensions),extend$(e)2) \
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$(foreach t,$(softfp_truncations),trunc$(t)2) \
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$(softfp_extras)
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ifeq ($(softfp_exclude_libgcc2),y)
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# This list is taken from mklibgcc.in and doesn't presently allow for
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# 64-bit targets where si should become di and di should become ti.
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softfp_func_list := $(filter-out floatdidf floatdisf fixunsdfsi fixunssfsi \
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fixunsdfdi fixdfdi fixunssfdi fixsfdi fixxfdi fixunsxfdi \
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floatdixf fixunsxfsi fixtfdi fixunstfdi floatditf \
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floatundidf floatundisf floatundixf floatunditf,$(softfp_func_list))
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endif
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ifeq ($(softfp_compat),y)
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softfp_file_list := $(addsuffix .c,$(softfp_func_list))
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ifeq ($(enable_shared),yes)
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softfp_map_dep := libgcc.map.in
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else
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softfp_map_dep :=
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endif
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softfp_set_symver = echo "asm (\".symver $(1),$(1)@`$(AWK) -f $(srcdir)/find-symver.awk -v symbol=$(1) libgcc.map.in`\");" >> $@
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$(softfp_file_list): $(softfp_map_dep)
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echo '#ifdef SHARED' > $@
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echo '#include "soft-fp/$@"' >> $@
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ifeq ($(enable_shared),yes)
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$(call softfp_set_symver,__$(*F))
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if grep strong_alias $(srcdir)/soft-fp/$@ > /dev/null; then \
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alias=`grep strong_alias $(srcdir)/soft-fp/$@ | sed -e 's/.*, *//' -e 's/).*//'`; \
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$(call softfp_set_symver,$$alias); \
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fi
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endif
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echo '#endif' >> $@
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else
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ifneq ($(softfp_wrap_start),)
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softfp_file_list := $(addsuffix .c,$(softfp_func_list))
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$(softfp_file_list):
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echo $(softfp_wrap_start) > $@
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echo '#include "soft-fp/$@"' >> $@
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echo $(softfp_wrap_end) >> $@
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else
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softfp_file_list := \
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$(addsuffix .c,$(addprefix $(srcdir)/soft-fp/,$(softfp_func_list)))
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endif
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endif
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# Disable missing prototype and type limit warnings. The prototypes
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# for the functions in the soft-fp files have not been brought across
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# from glibc.
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soft-fp-objects-base = $(basename $(notdir $(softfp_file_list)))
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soft-fp-objects = $(addsuffix $(objext), $(soft-fp-objects-base)) \
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$(addsuffix _s$(objext), $(soft-fp-objects-base))
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$(soft-fp-objects) : INTERNAL_CFLAGS += -Wno-missing-prototypes -Wno-type-limits
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LIB2ADD += $(softfp_file_list)
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ifneq ($(softfp_exclude_libgcc2),y)
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# Functions in libgcc2.c are excluded for each soft-float mode (a
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# target may have both soft-float and hard-float modes), for the fixed
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# list of integer modes (si and di) for which libgcc2.c defines any
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# such functions. Depending on the target, the si and di symbols may
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# in fact define di and ti functions.
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LIB2FUNCS_EXCLUDE += \
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$(addprefix _,$(foreach m,$(softfp_float_modes), \
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$(foreach i,si di, \
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$(softfp_floatint_funcs))))
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endif
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