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- # -*- shell-script -*-
- # Copyright (C) 2012-2022 Free Software Foundation, Inc.
- # Contributed by Richard Henderson <rth@redhat.com>.
- #
- # This file is part of the GNU Atomic Library (libatomic).
- #
- # Libatomic 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 of the License, or
- # (at your option) any later version.
- #
- # Libatomic 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.
- #
- # Under Section 7 of GPL version 3, you are granted additional
- # permissions described in the GCC Runtime Library Exception, version
- # 3.1, as published by the Free Software Foundation.
- #
- # You should have received a copy of the GNU General Public License and
- # a copy of the GCC Runtime Library Exception along with this program;
- # see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
- # <http://www.gnu.org/licenses/>.
- # Map the target cpu to an ARCH sub-directory. At the same time,
- # work out any special compilation flags as necessary.
- # Give operating systems the opportunity to discard XCFLAGS modifications based
- # on ${target_cpu}. For example to allow proper use of multilibs.
- configure_tgt_pre_target_cpu_XCFLAGS="${XCFLAGS}"
- case "${target_cpu}" in
- alpha*)
- # fenv.c needs this option to generate inexact exceptions.
- XCFLAGS="${XCFLAGS} -mfp-trap-mode=sui"
- ARCH=alpha
- ;;
- rs6000 | powerpc*) ARCH=powerpc ;;
- riscv*) ARCH=riscv ;;
- sh*) ARCH=sh ;;
- aarch64*)
- ARCH=aarch64
- case "${target}" in
- aarch64*-*-linux*)
- if test -n "$enable_aarch64_lse"; then
- try_ifunc=yes
- fi
- ;;
- esac
- ;;
- arm*)
- ARCH=arm
- case "${target}" in
- arm*-*-freebsd* | arm*-*-netbsd*)
- ;;
- *)
- # ??? Detect when -march=armv7 is already enabled.
- try_ifunc=yes
- ;;
- esac
- ;;
- sparc)
- case " ${CC} ${CFLAGS} " in
- *" -m64 "*)
- ;;
- *)
- if test -z "$with_cpu"; then
- XCFLAGS="${XCFLAGS} -mcpu=v9"
- fi
- esac
- ARCH=sparc
- ;;
- sparc64|sparcv9)
- case " ${CC} ${CFLAGS} " in
- *" -m32 "*)
- XCFLAGS="${XCFLAGS} -mcpu=v9"
- ;;
- esac
- ARCH=sparc
- ;;
- i[3456]86 | x86_64)
- cat > conftestx.c <<EOF
- #ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
- #error need -march=i486
- #endif
- EOF
- if ${CC} ${CFLAGS} -E conftestx.c > /dev/null 2>&1; then
- :
- else
- if test "${target_cpu}" = x86_64; then
- XCFLAGS="${XCFLAGS} -march=i486 -mtune=generic"
- else
- XCFLAGS="${XCFLAGS} -march=i486 -mtune=${target_cpu}"
- fi
- XCFLAGS="${XCFLAGS} -fomit-frame-pointer"
- fi
- cat > conftestx.c <<EOF
- #ifdef __x86_64__
- #ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
- #error need -mcx16
- #endif
- #else
- #ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
- #error need -march=i686
- #endif
- #endif
- EOF
- if ${CC} ${CFLAGS} -E conftestx.c > /dev/null 2>&1; then
- try_ifunc=no
- else
- try_ifunc=yes
- fi
- rm -f conftestx.c
- ARCH=x86
- ;;
- *) ARCH="${target_cpu}" ;;
- esac
- # The cpu configury is always most relevant.
- if test -d ${srcdir}/config/$ARCH ; then
- config_path="$ARCH"
- fi
- tmake_file=
- # Other system configury
- case "${target}" in
- aarch64*-*-linux*)
- # OS support for atomic primitives.
- config_path="${config_path} linux/aarch64 posix"
- ;;
- arm*-*-linux* | arm*-*-uclinux*)
- # OS support for atomic primitives.
- config_path="${config_path} linux/arm posix"
- ;;
- s390*-*-linux*)
- # OS support for atomic primitives.
- config_path="${config_path} s390 posix"
- ;;
- powerpc*-*-aix*)
- config_path="${config_path} posix"
- tmake_file="t-aix"
- ;;
- *-*-linux* | *-*-gnu* | *-*-k*bsd*-gnu \
- | *-*-netbsd* | *-*-freebsd* | *-*-openbsd* | *-*-dragonfly* \
- | *-*-solaris2* | *-*-sysv4* | *-*-irix6* | *-*-osf* | *-*-hpux11* \
- | *-*-darwin* | *-*-aix* | *-*-cygwin*)
- # POSIX system. The OS is supported.
- config_path="${config_path} posix"
- ;;
- *-*-mingw*)
- # OS support for atomic primitives.
- case ${target_thread_file} in
- win32)
- config_path="${config_path} mingw"
- ;;
- posix)
- config_path="${config_path} posix"
- ;;
- esac
- ;;
- *-*-rtems*)
- XCFLAGS="${configure_tgt_pre_target_cpu_XCFLAGS}"
- config_path="rtems"
- ;;
- *-*-elf*)
- # ??? No target OS. We could be targeting bare-metal kernel-mode,
- # or user-mode for some custom OS. If the target supports TAS,
- # we can build our own spinlocks, given there are no signals.
- # If the target supports disabling interrupts, we can work in
- # kernel-mode, given the system is not multi-processor.
- UNSUPPORTED=1
- ;;
- nvptx*-*-*)
- ;;
- *)
- # Who are you?
- UNSUPPORTED=1
- ;;
- esac
- # glibc will pass hwcap to ifunc resolver functions as an argument.
- # The type may be different on different architectures.
- case "${target}" in
- aarch64*-*-*)
- IFUNC_RESOLVER_ARGS="uint64_t hwcap"
- ;;
- *)
- IFUNC_RESOLVER_ARGS="void"
- ;;
- esac
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