libatomic/configure.tgt

   1 # -*- shell-script -*-
   2 #  Copyright (C) 2012-2024 Free Software Foundation, Inc.
   3 #  Contributed by Richard Henderson <rth@redhat.com>.
   4 #
   5 #  This file is part of the GNU Atomic Library (libatomic).
   6 #
   7 #  Libatomic is free software; you can redistribute it and/or modify it
   8 #  under the terms of the GNU General Public License as published by
   9 #  the Free Software Foundation; either version 3 of the License, or
  10 #  (at your option) any later version.
  11 #
  12 #  Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
  13 #  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  14 #  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15 #  more details.
  16 #
  17 #  Under Section 7 of GPL version 3, you are granted additional
  18 #  permissions described in the GCC Runtime Library Exception, version
  19 #  3.1, as published by the Free Software Foundation.
  20 #
  21 #  You should have received a copy of the GNU General Public License and
  22 #  a copy of the GCC Runtime Library Exception along with this program;
  23 #  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 #  <http://www.gnu.org/licenses/>.
  25
  26 # Map the target cpu to an ARCH sub-directory.  At the same time,
  27 # work out any special compilation flags as necessary.
  28
  29 # Give operating systems the opportunity to discard XCFLAGS modifications based
  30 # on ${target_cpu}.  For example to allow proper use of multilibs.
  31 configure_tgt_pre_target_cpu_XCFLAGS="${XCFLAGS}"
  32
  33 case "${target_cpu}" in
  34   alpha*)
  35         # fenv.c needs this option to generate inexact exceptions.
  36         XCFLAGS="${XCFLAGS} -mfp-trap-mode=sui"
  37         ARCH=alpha
  38         ;;
  39   rs6000 | powerpc*)    ARCH=powerpc ;;
  40   riscv*)               ARCH=riscv ;;
  41   sh*)                  ARCH=sh ;;
  42
  43   aarch64*)
  44         ARCH=aarch64
  45         case "${target}" in
  46             aarch64*-*-linux*)
  47                 if test -n "$enable_aarch64_lse"; then
  48                     try_ifunc=yes
  49                 fi
  50                 ;;
  51         esac
  52         XCFLAGS="${XCFLAGS} -mno-outline-atomics"
  53         ;;
  54   arm*)
  55         ARCH=arm
  56         case "${target}" in
  57             arm*-*-freebsd* | arm*-*-netbsd*)
  58                 ;;
  59             *)
  60                 # ??? Detect when -march=armv7 is already enabled.
  61                 try_ifunc=yes
  62                 ;;
  63         esac
  64         ;;
  65   sparc)
  66         case " ${CC} ${CFLAGS} " in
  67           *" -m64 "*)
  68             ;;
  69           *)
  70             if test -z "$with_cpu"; then
  71               XCFLAGS="${XCFLAGS} -mcpu=v9"
  72             fi
  73         esac
  74         ARCH=sparc
  75         ;;
  76   sparc64|sparcv9)
  77         case " ${CC} ${CFLAGS} " in
  78           *" -m32 "*)
  79             XCFLAGS="${XCFLAGS} -mcpu=v9"
  80             ;;
  81         esac
  82         ARCH=sparc
  83         ;;
  84
  85   i[3456]86 | x86_64)
  86         cat > conftestx.c <<EOF
  87 #ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
  88 #error need -march=i486
  89 #endif
  90 EOF
  91         if ${CC} ${CFLAGS} -E conftestx.c > /dev/null 2>&1; then
  92           :
  93         else
  94           if test "${target_cpu}" = x86_64; then
  95             XCFLAGS="${XCFLAGS} -march=i486 -mtune=generic"
  96           else
  97             XCFLAGS="${XCFLAGS} -march=i486 -mtune=${target_cpu}"
  98           fi
  99           XCFLAGS="${XCFLAGS} -fomit-frame-pointer"
 100         fi
 101         cat > conftestx.c <<EOF
 102 #ifdef __x86_64__
 103 #error ifunc is always wanted for 16B atomic load
 104 #else
 105 #ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
 106 #error need -march=i686
 107 #endif
 108 #endif
 109 EOF
 110         if ${CC} ${CFLAGS} -E conftestx.c > /dev/null 2>&1; then
 111           try_ifunc=no
 112         else
 113           try_ifunc=yes
 114         fi
 115         rm -f conftestx.c
 116         ARCH=x86
 117         ;;
 118
 119   *)                    ARCH="${target_cpu}" ;;
 120 esac
 121
 122 # The cpu configury is always most relevant.
 123 if test -d ${srcdir}/config/$ARCH ; then
 124   config_path="$ARCH"
 125 fi
 126
 127 tmake_file=
 128 # Other system configury
 129 case "${target}" in
 130   aarch64*-*-linux*)
 131         # OS support for atomic primitives.
 132         config_path="${config_path} linux/aarch64 posix"
 133         ;;
 134
 135   arm*-*-linux* | arm*-*-uclinux*)
 136         # OS support for atomic primitives.
 137         config_path="${config_path} linux/arm posix"
 138         ;;
 139
 140   s390*-*-linux*)
 141         # OS support for atomic primitives.
 142         config_path="${config_path} s390 posix"
 143         ;;
 144
 145   powerpc*-*-aix*)
 146         config_path="${config_path} posix"
 147         tmake_file="t-aix"
 148         ;;
 149
 150   *-*-linux* | *-*-gnu* | *-*-k*bsd*-gnu \
 151   | *-*-netbsd* | *-*-freebsd* | *-*-openbsd* | *-*-dragonfly* \
 152   | *-*-solaris2* | *-*-sysv4* | *-*-irix6* | *-*-osf* | *-*-hpux11* \
 153   | *-*-darwin* | *-*-aix* | *-*-cygwin*)
 154         # POSIX system.  The OS is supported.
 155         config_path="${config_path} posix"
 156         ;;
 157
 158   *-*-mingw*)
 159         # OS support for atomic primitives.
 160         case ${target_thread_file} in
 161           win32 | mcf | single)
 162             config_path="${config_path} mingw"
 163             ;;
 164           posix)
 165             config_path="${config_path} posix"
 166             ;;
 167         esac
 168         ;;
 169
 170   *-*-rtems*)
 171         XCFLAGS="${configure_tgt_pre_target_cpu_XCFLAGS}"
 172         config_path="rtems"
 173         ;;
 174
 175   *-*-elf*)
 176         # ??? No target OS.  We could be targeting bare-metal kernel-mode,
 177         # or user-mode for some custom OS.  If the target supports TAS,
 178         # we can build our own spinlocks, given there are no signals.
 179         # If the target supports disabling interrupts, we can work in
 180         # kernel-mode, given the system is not multi-processor.
 181         UNSUPPORTED=1
 182         ;;
 183
 184   nvptx*-*-*)
 185         ;;
 186
 187   *)
 188         # Who are you?
 189         UNSUPPORTED=1
 190         ;;
 191 esac
 192
 193 # glibc will pass hwcap to ifunc resolver functions as an argument.
 194 # The type may be different on different architectures.
 195 case "${target}" in
 196   aarch64*-*-*)
 197         IFUNC_RESOLVER_ARGS="uint64_t hwcap"
 198         ;;
 199   *)
 200         IFUNC_RESOLVER_ARGS="void"
 201         ;;
 202 esac