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zfs/config/user-libatomic.m4

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libspl: implement atomics in terms of atomics This replaces the generic libspl atomic.c atomics implementation with one based on builtin gcc atomics. This functionality was added as an experimental feature in gcc 4.4. Today even CentOS 7 ships with gcc 4.8 as the default compiler we can make this the default. Furthermore, the builtin atomics are as good or better than our hand-rolled implementation so it's reasonable to drop that custom code. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #11904
2021-04-19 05:13:24 +00:00
dnl #
config/libatomic: require -latomic iff atomic.c doesn't link w/o it In absence of LTO, and dynamic libatomic, la.so ends up in the needs section of every toolchain executable; some consider this an issue. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12345 Closes #12359
2021-07-13 20:50:48 +00:00
dnl # If -latomic exists and atomic.c doesn't link without it,
dnl # it's needed for __atomic intrinsics.
libspl: implement atomics in terms of atomics This replaces the generic libspl atomic.c atomics implementation with one based on builtin gcc atomics. This functionality was added as an experimental feature in gcc 4.4. Today even CentOS 7 ships with gcc 4.8 as the default compiler we can make this the default. Furthermore, the builtin atomics are as good or better than our hand-rolled implementation so it's reasonable to drop that custom code. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #11904
2021-04-19 05:13:24 +00:00
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_LIBATOMIC], [
config/libatomic: require -latomic iff atomic.c doesn't link w/o it In absence of LTO, and dynamic libatomic, la.so ends up in the needs section of every toolchain executable; some consider this an issue. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12345 Closes #12359
2021-07-13 20:50:48 +00:00
AC_MSG_CHECKING([whether -latomic is required])
libspl: implement atomics in terms of atomics This replaces the generic libspl atomic.c atomics implementation with one based on builtin gcc atomics. This functionality was added as an experimental feature in gcc 4.4. Today even CentOS 7 ships with gcc 4.8 as the default compiler we can make this the default. Furthermore, the builtin atomics are as good or better than our hand-rolled implementation so it's reasonable to drop that custom code. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #11904
2021-04-19 05:13:24 +00:00
saved_libs="$LIBS"
LIBS="$LIBS -latomic"
config/libatomic: require -latomic iff atomic.c doesn't link w/o it In absence of LTO, and dynamic libatomic, la.so ends up in the needs section of every toolchain executable; some consider this an issue. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12345 Closes #12359
2021-07-13 20:50:48 +00:00
LIBATOMIC_LIBS=""
libspl: implement atomics in terms of atomics This replaces the generic libspl atomic.c atomics implementation with one based on builtin gcc atomics. This functionality was added as an experimental feature in gcc 4.4. Today even CentOS 7 ships with gcc 4.8 as the default compiler we can make this the default. Furthermore, the builtin atomics are as good or better than our hand-rolled implementation so it's reasonable to drop that custom code. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #11904
2021-04-19 05:13:24 +00:00
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
config/libatomic: require -latomic iff atomic.c doesn't link w/o it In absence of LTO, and dynamic libatomic, la.so ends up in the needs section of every toolchain executable; some consider this an issue. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12345 Closes #12359
2021-07-13 20:50:48 +00:00
LIBS="$saved_libs"
saved_cflags="$CFLAGS"
CFLAGS="$CFLAGS -isystem lib/libspl/include"
AC_LINK_IFELSE([AC_LANG_PROGRAM([#include "lib/libspl/atomic.c"], [])], [], [LIBATOMIC_LIBS="-latomic"])
CFLAGS="$saved_cflags"
])
if test -n "$LIBATOMIC_LIBS"; then
libspl: implement atomics in terms of atomics This replaces the generic libspl atomic.c atomics implementation with one based on builtin gcc atomics. This functionality was added as an experimental feature in gcc 4.4. Today even CentOS 7 ships with gcc 4.8 as the default compiler we can make this the default. Furthermore, the builtin atomics are as good or better than our hand-rolled implementation so it's reasonable to drop that custom code. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #11904
2021-04-19 05:13:24 +00:00
AC_MSG_RESULT([yes])
config/libatomic: require -latomic iff atomic.c doesn't link w/o it In absence of LTO, and dynamic libatomic, la.so ends up in the needs section of every toolchain executable; some consider this an issue. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12345 Closes #12359
2021-07-13 20:50:48 +00:00
else
libspl: implement atomics in terms of atomics This replaces the generic libspl atomic.c atomics implementation with one based on builtin gcc atomics. This functionality was added as an experimental feature in gcc 4.4. Today even CentOS 7 ships with gcc 4.8 as the default compiler we can make this the default. Furthermore, the builtin atomics are as good or better than our hand-rolled implementation so it's reasonable to drop that custom code. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #11904
2021-04-19 05:13:24 +00:00
AC_MSG_RESULT([no])
config/libatomic: require -latomic iff atomic.c doesn't link w/o it In absence of LTO, and dynamic libatomic, la.so ends up in the needs section of every toolchain executable; some consider this an issue. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12345 Closes #12359
2021-07-13 20:50:48 +00:00
fi
libspl: implement atomics in terms of atomics This replaces the generic libspl atomic.c atomics implementation with one based on builtin gcc atomics. This functionality was added as an experimental feature in gcc 4.4. Today even CentOS 7 ships with gcc 4.8 as the default compiler we can make this the default. Furthermore, the builtin atomics are as good or better than our hand-rolled implementation so it's reasonable to drop that custom code. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #11904
2021-04-19 05:13:24 +00:00
LIBS="$saved_libs"
AC_SUBST([LIBATOMIC_LIBS])
])