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t-softfp revision 1.3 
      1 # Copyright (C) 2006-2013 Free Software Foundation, Inc.
      2 
      3 # This file is part of GCC.
      4 
      5 # GCC is free software; you can redistribute it and/or modify
      6 # it under the terms of the GNU General Public License as published by
      7 # the Free Software Foundation; either version 3, or (at your option)
      8 # any later version.
      9 
     10 # GCC is distributed in the hope that it will be useful,
     11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
     12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13 # GNU General Public License for more details.
     14 
     15 # You should have received a copy of the GNU General Public License
     16 # along with GCC; see the file COPYING3.  If not see
     17 # <http://www.gnu.org/licenses/>.
     18 
     19 # Targets using soft-fp should define the following variables:
     20 #
     21 # softfp_float_modes: a list of soft-float floating-point modes,
     22 #                     e.g. sf df
     23 # softfp_int_modes: a list of integer modes for which to define conversions,
     24 #                   e.g. si di
     25 # softfp_extensions: a list of extensions between floating-point modes,
     26 #                    e.g. sfdf
     27 # softfp_truncations: a list of truncations between floating-point modes,
     28 #                     e.g. dfsf
     29 #
     30 # Extensions and truncations should include those where only one mode
     31 # is a soft-float mode; for example, sftf where sf is hard-float and
     32 # tf is soft-float.
     33 #
     34 # If the libgcc2.c functions should not be replaced, also define:
     35 #
     36 # softfp_exclude_libgcc2 := y
     37 #
     38 # Avoiding replacing the libgcc2.c functions is a temporary measure
     39 # for targets with both hard-float and soft-float multilibs, since
     40 # these variables apply for all multilibs.  With toplevel libgcc,
     41 # soft-fp can be used conditionally on the multilib instead.
     42 #
     43 # If the code should not be compiled at all for some multilibs, define:
     44 #
     45 # softfp_wrap_start: text to put at the start of wrapper source files,
     46 #                    output with echo
     47 #                    e.g. '#ifndef __powerpc64__'
     48 # softfp_wrap_end: text to put at the end of wrapper source files,
     49 #                  e.g. '#endif'
     50 #
     51 # This is another temporary measure.
     52 
     53 softfp_float_funcs = add$(m)3 div$(m)3 eq$(m)2 ge$(m)2 le$(m)2 mul$(m)3 \
     54   neg$(m)2 sub$(m)3 unord$(m)2
     55 softfp_floatint_funcs = fix$(m)$(i) fixuns$(m)$(i) \
     56   float$(i)$(m) floatun$(i)$(m)
     57 
     58 softfp_func_list := \
     59   $(foreach m,$(softfp_float_modes), \
     60               $(softfp_float_funcs) \
     61               $(foreach i,$(softfp_int_modes), \
     62                           $(softfp_floatint_funcs))) \
     63   $(foreach e,$(softfp_extensions),extend$(e)2) \
     64   $(foreach t,$(softfp_truncations),trunc$(t)2)
     65 
     66 ifeq ($(softfp_exclude_libgcc2),y)
     67 # This list is taken from mklibgcc.in and doesn't presently allow for
     68 # 64-bit targets where si should become di and di should become ti.
     69 softfp_func_list := $(filter-out floatdidf floatdisf fixunsdfsi fixunssfsi \
     70   fixunsdfdi fixdfdi fixunssfdi fixsfdi fixxfdi fixunsxfdi \
     71   floatdixf fixunsxfsi fixtfdi fixunstfdi floatditf \
     72   floatundidf floatundisf floatundixf floatunditf,$(softfp_func_list))
     73 endif
     74 
     75 ifeq ($(softfp_wrap_start),)
     76 softfp_file_list := \
     77   $(addsuffix .c,$(addprefix $(srcdir)/soft-fp/,$(softfp_func_list)))
     78 else
     79 softfp_file_list := $(addsuffix .c,$(softfp_func_list))
     80 
     81 $(softfp_file_list):
     82 	echo $(softfp_wrap_start) > $@
     83 	echo '#include "soft-fp/$@"' >> $@
     84 	echo $(softfp_wrap_end) >> $@
     85 endif
     86 
     87 # Disable missing prototype and type limit warnings.  The prototypes
     88 # for the functions in the soft-fp files have not been brought across
     89 # from glibc.
     90 
     91 soft-fp-objects = $(addsuffix $(objext), $(softfp_file_list)) \
     92   $(addsuffix _s$(objext), $(softfp_file_list))
     93 
     94 $(soft-fp-objects) : INTERNAL_CFLAGS += -Wno-missing-prototypes -Wno-type-limits
     95 
     96 LIB2ADD += $(softfp_file_list)
     97 
     98 ifneq ($(softfp_exclude_libgcc2),y)
     99 # Functions in libgcc2.c are excluded for each soft-float mode (a
    100 # target may have both soft-float and hard-float modes), for the fixed
    101 # list of integer modes (si and di) for which libgcc2.c defines any
    102 # such functions.  Depending on the target, the si and di symbols may
    103 # in fact define di and ti functions.
    104 
    105 LIB2FUNCS_EXCLUDE += \
    106   $(addprefix _,$(foreach m,$(softfp_float_modes), \
    107                             $(foreach i,si di, \
    108                                         $(softfp_floatint_funcs))))
    109 endif
    110