2 # Copyright (C) 2012-2024 Free Software Foundation, Inc.
3 # Contributed by Richard Henderson <rth@redhat.com>.
5 # This file is part of the GNU Atomic Library (libatomic).
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.
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
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.
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/>.
26 # Map the target cpu to an ARCH sub-directory. At the same time,
27 # work out any special compilation flags as necessary.
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}"
33 case "${target_cpu}" in
35 # fenv.c needs this option to generate inexact exceptions.
36 XCFLAGS="${XCFLAGS} -mfp-trap-mode=sui"
39 rs6000 | powerpc*) ARCH=powerpc ;;
47 if test -n "$enable_aarch64_lse"; then
52 XCFLAGS="${XCFLAGS} -mno-outline-atomics"
57 arm*-*-freebsd* | arm*-*-netbsd*)
60 # ??? Detect when -march=armv7 is already enabled.
66 case " ${CC} ${CFLAGS} " in
70 if test -z "$with_cpu"; then
71 XCFLAGS="${XCFLAGS} -mcpu=v9"
77 case " ${CC} ${CFLAGS} " in
79 XCFLAGS="${XCFLAGS} -mcpu=v9"
86 cat > conftestx.c <<EOF
87 #ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
88 #error need -march=i486
91 if ${CC} ${CFLAGS} -E conftestx.c > /dev/null 2>&1; then
94 if test "${target_cpu}" = x86_64; then
95 XCFLAGS="${XCFLAGS} -march=i486 -mtune=generic"
97 XCFLAGS="${XCFLAGS} -march=i486 -mtune=${target_cpu}"
99 XCFLAGS="${XCFLAGS} -fomit-frame-pointer"
101 cat > conftestx.c <<EOF
103 #error ifunc is always wanted for 16B atomic load
105 #ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
106 #error need -march=i686
110 if ${CC} ${CFLAGS} -E conftestx.c > /dev/null 2>&1; then
119 *) ARCH="${target_cpu}" ;;
122 # The cpu configury is always most relevant.
123 if test -d ${srcdir}/config/$ARCH ; then
128 # Other system configury
131 # OS support for atomic primitives.
132 config_path="${config_path} linux/aarch64 posix"
135 arm*-*-linux* | arm*-*-uclinux*)
136 # OS support for atomic primitives.
137 config_path="${config_path} linux/arm posix"
141 # OS support for atomic primitives.
142 config_path="${config_path} s390 posix"
146 config_path="${config_path} posix"
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"
159 # OS support for atomic primitives.
160 case ${target_thread_file} in
161 win32 | mcf | single)
162 config_path="${config_path} mingw"
165 config_path="${config_path} posix"
171 XCFLAGS="${configure_tgt_pre_target_cpu_XCFLAGS}"
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.
193 # glibc will pass hwcap to ifunc resolver functions as an argument.
194 # The type may be different on different architectures.
197 IFUNC_RESOLVER_ARGS="uint64_t hwcap"
200 IFUNC_RESOLVER_ARGS="void"