1 AC_DEFUN([LIBUNWIND___THREAD], 2 [dnl Check whether the compiler supports the __thread keyword. 3 if test "x$enable___thread" != xno; then 4 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread, 5 [cat > conftest.c <<\EOF 6 __thread int a = 42; 7 EOF 8 if AC_TRY_COMMAND([${CC-cc} $CFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then 9 libc_cv_gcc___thread=yes 10 else 11 libc_cv_gcc___thread=no 12 fi 13 rm -f conftest*]) 14 if test "$libc_cv_gcc___thread" = yes; then 15 AC_DEFINE(HAVE___THREAD, 1, 16 [Define to 1 if __thread keyword is supported by the C compiler.]) 17 fi 18 else 19 libc_cv_gcc___thread=no 20 fi]) 21 22 AC_DEFUN([CHECK_ATOMIC_OPS], 23 [dnl Check whether the system has the atomic_ops package installed. 24 AC_CHECK_HEADERS(atomic_ops.h) 25 # 26 # Don't link against libatomic_ops for now. We don't want libunwind 27 # to depend on libatomic_ops.so. Fortunately, none of the platforms 28 # we care about so far need libatomic_ops.a (everything is done via 29 # inline macros). 30 # 31 # AC_CHECK_LIB(atomic_ops, main) 32 ]) 33 34 # ANDROID support update. 35 AC_DEFUN([CHECK_ANDROID], 36 [dnl Check whether the system has __ANDROID__ defined. 37 if test "x$enable_conserve_stack" != xno; then 38 AC_CACHE_CHECK([for __ANDROID__], ac_cv_android, 39 [cat > conftest.c <<\EOF 40 #if !defined(__ANDROID__) 41 value = fail 42 #endif 43 EOF 44 if AC_TRY_COMMAND([${CC-cc} $CFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then 45 ac_cv_android=yes 46 else 47 ac_cv_android=no 48 fi 49 rm -f conftest*]) 50 if test "$ac_cv_android" = yes; then 51 AC_DEFINE([CONSERVE_STACK], [], 52 [Allocate large structures rather than place them on the stack.]) 53 fi 54 else 55 ac_cv_android=no 56 fi]) 57 # End of ANDROID update. 58
