gcc/config/arm/t-arm-elf

# Copyright (C) 1998-2021 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/>.

# Build a very basic set of libraries that should cater for most cases.

# Single-precision floating-point is NOT supported; we don't build a
# suitable library for that.  Use the rm-profile config in that case.

# PART 1 - Useful groups of options

dp_fpus		:= vfp vfpv2 vfpv3 vfpv3-fp16 vfpv3-d16 vfpv3-d16-fp16 \
		   neon neon-vfpv3 neon-fp16 vfpv4 neon-vfpv4 vfpv4-d16 \
		   fpv5-d16 fp-armv8 neon-fp-armv8 crypto-neon-fp-armv8 \
		   vfp3

sp_fpus		:= vfpv3xd vfpv3xd-fp16  fpv4-sp-d16 fpv5-sp-d16

v7a_fps		:= vfpv3 vfpv3-fp16 vfpv4 simd neon-fp16 neon-vfpv4
v7ve_fps	:= vfpv3-d16 vfpv3 vfpv3-d16-fp16 vfpv3-fp16 vfpv4 neon \
		   neon-fp16 simd

# Not all these permutations exist for all architecture variants, but
# it seems to work ok.
v8_fps		:= simd fp16 crypto fp16+crypto dotprod fp16fml

# We don't do anything special with these.  Pre-v4t probably doesn't work.
all_early_nofp	:= armv4 armv4t armv5t

all_early_arch	:= armv5tej armv6 armv6j armv6k armv6z armv6kz \
		   armv6zk armv6t2 iwmmxt iwmmxt2

all_v7_a_r	:= armv7-a armv7ve armv7-r

all_v8_archs	:= armv8-a armv8-a+crc armv8.1-a armv8.2-a armv8.3-a armv8.4-a \
		   armv8.5-a armv8.6-a

# No floating point variants, require thumb1 softfp
all_nofp_t	:= armv6-m armv6s-m armv8-m.base

all_nofp_t2	:= armv7-m

all_sp_only	:= armv7e-m armv8-m.main

MULTILIB_OPTIONS     =
MULTILIB_DIRNAMES    =
MULTILIB_EXCEPTIONS  = 
MULTILIB_MATCHES     =
MULTILIB_REUSE	     =

# PART 2 - multilib build rules

MULTILIB_OPTIONS     += marm/mthumb
MULTILIB_DIRNAMES    += arm thumb

MULTILIB_OPTIONS     += mfpu=auto
MULTILIB_DIRNAMES    += autofp

MULTILIB_OPTIONS     += march=armv5te+fp/march=armv7+fp
MULTILIB_DIRNAMES    += v5te v7

MULTILIB_OPTIONS     += mfloat-abi=hard
MULTILIB_DIRNAMES    += fpu

# Build a total of 4 library variants (base options plus the following):
MULTILIB_REQUIRED    += mthumb
MULTILIB_REQUIRED    += marm/mfpu=auto/march=armv5te+fp/mfloat-abi=hard
MULTILIB_REQUIRED    += mthumb/mfpu=auto/march=armv7+fp/mfloat-abi=hard

# PART 3 - Match rules

# Map all supported FPUs onto mfpu=auto
MULTILIB_MATCHES     += $(foreach FPU, $(dp_fpus), \
			  mfpu?auto=mfpu?$(FPU))

MULTILIB_MATCHES     += march?armv5te+fp=march?armv5te

MULTILIB_MATCHES     += $(foreach ARCH, $(all_early_arch), \
		          march?armv5te+fp=march?$(ARCH) \
			  march?armv5te+fp=march?$(ARCH)+fp)

MULTILIB_MATCHES     += march?armv7+fp=march?armv7

MULTILIB_MATCHES     += $(foreach FPARCH, $(v7a_fps), \
		          march?armv7+fp=march?armv7-a+$(FPARCH))

MULTILIB_MATCHES     += $(foreach FPARCH, $(v7ve_fps), \
		          march?armv7+fp=march?armv7ve+$(FPARCH))

MULTILIB_MATCHES     += $(foreach ARCH, $(all_v7_a_r), \
			  march?armv7+fp=march?$(ARCH) \
			  march?armv7+fp=march?$(ARCH)+fp)

MULTILIB_MATCHES     += $(foreach ARCH, $(all_v8_archs), \
			  march?armv7+fp=march?$(ARCH) \
			  $(foreach FPARCH, $(v8_fps), \
			    march?armv7+fp=march?$(ARCH)+$(FPARCH)))

MULTILIB_MATCHES     += $(foreach ARCH, armv7e-m armv8-m.mainline, \
			  march?armv7+fp=march?$(ARCH)+fp.dp)

# PART 4 - Reuse rules

MULTILIB_REUSE	     += mthumb=mthumb/mfpu.auto
MULTILIB_REUSE	     += mthumb=mthumb/mfpu.auto/march.armv5te+fp
MULTILIB_REUSE	     += mthumb=mthumb/march.armv5te+fp
MULTILIB_REUSE	     += marm/mfpu.auto/march.armv5te+fp/mfloat-abi.hard=marm/march.armv5te+fp/mfloat-abi.hard
MULTILIB_REUSE	     += marm/mfpu.auto/march.armv5te+fp/mfloat-abi.hard=march.armv5te+fp/mfloat-abi.hard
MULTILIB_REUSE	     += marm/mfpu.auto/march.armv5te+fp/mfloat-abi.hard=mfpu.auto/march.armv5te+fp/mfloat-abi.hard
MULTILIB_REUSE	     += mthumb/mfpu.auto/march.armv7+fp/mfloat-abi.hard=mthumb/march.armv7+fp/mfloat-abi.hard
MULTILIB_REUSE	     += mthumb/mfpu.auto/march.armv7+fp/mfloat-abi.hard=mfpu.auto/march.armv7+fp/mfloat-abi.hard
MULTILIB_REUSE	     += mthumb/mfpu.auto/march.armv7+fp/mfloat-abi.hard=march.armv7+fp/mfloat-abi.hard