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AC_DEFUN([LIBUNWIND___THREAD],
[dnl Check whether the compiler supports the __thread keyword.
if test "x$enable___thread" != xno; then
AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
[cat > conftest.c <<\EOF
__thread int a = 42;
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
libc_cv_gcc___thread=yes
else
libc_cv_gcc___thread=no
fi
rm -f conftest*])
if test "$libc_cv_gcc___thread" = yes; then
AC_DEFINE(HAVE___THREAD, 1,
[Define to 1 if __thread keyword is supported by the C compiler.])
fi
else
libc_cv_gcc___thread=no
fi])
AC_DEFUN([CHECK_ATOMIC_OPS],
[dnl Check whether the system has the atomic_ops package installed.
AC_CHECK_HEADERS(atomic_ops.h)
#
# Don't link against libatomic_ops for now. We don't want libunwind
# to depend on libatomic_ops.so. Fortunately, none of the platforms
# we care about so far need libatomic_ops.a (everything is done via
# inline macros).
#
# AC_CHECK_LIB(atomic_ops, main)
])
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