libgo: Use __USING_SJLJ_EXCEPTIONS__ rather than configure test.

From Eric Botcazou.

From-SVN: r223231

libgo/config.h.in

@@ -337,9 +337,6 @@
 /* Define to 1 if you have the `wait4' function. */
 #undef HAVE_WAIT4
 
-/* Define if the C++ compiler is configured for setjmp/longjmp exceptions. */
-#undef LIBGO_SJLJ_EXCEPTIONS
-
 /* Define if the linker support split stack adjustments */
 #undef LINKER_SUPPORTS_SPLIT_STACK
 

libgo/configure

@@ -828,7 +828,6 @@ enable_version_specific_runtime_libs
 with_libffi
 with_libatomic
 with_system_libunwind
-enable_sjlj_exceptions
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1469,8 +1468,6 @@ Optional Features:
   --enable-version-specific-runtime-libs
                           Specify that runtime libraries should be installed
                           in a compiler-specific directory
-  --enable-sjlj-exceptions
-                          force use of builtin_setjmp for exceptions
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -11121,7 +11118,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11124 "configure"
+#line 11121 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11227,7 +11224,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11230 "configure"
+#line 11227 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -14667,68 +14664,6 @@ $as_echo "#define HAVE_GETIPINFO 1" >>confdefs.h
   fi
 
 
-# Check whether --enable-sjlj-exceptions was given.
-if test "${enable_sjlj_exceptions+set}" = set; then :
-  enableval=$enable_sjlj_exceptions; case "$enableval" in
-   yes|no|auto) ;;
-   *) as_fn_error "unknown argument to --enable-sjlj-exceptions" "$LINENO" 5 ;;
-   esac
-else
-  enable_sjlj_exceptions=auto
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to use setjmp/longjmp exceptions" >&5
-$as_echo_n "checking whether to use setjmp/longjmp exceptions... " >&6; }
-if test "${libgo_cv_lib_sjlj_exceptions+set}" = set; then :
-  $as_echo_n "(cached) " >&6
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-void bar ();
-void clean (int *);
-void foo ()
-{
-  int i __attribute__ ((cleanup (clean)));
-  bar();
-}
-
-_ACEOF
-CFLAGS_hold=$CFLAGS
-CFLAGS="--save-temps -fexceptions"
-libgo_cv_lib_sjlj_exceptions=unknown
-if ac_fn_c_try_compile; then :
-  if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then
-    libgo_cv_lib_sjlj_exceptions=yes
-  elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then
-    libgo_cv_lib_sjlj_exceptions=no
-  fi
-fi
-CFLAGS=$CFLAGS_hold
-rm -f conftest*
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_lib_sjlj_exceptions" >&5
-$as_echo "$libgo_cv_lib_sjlj_exceptions" >&6; }
-
-if test "$enable_sjlj_exceptions" = "auto"; then
-  enable_sjlj_exceptions=$libgo_cv_lib_sjlj_exceptions
-fi
-
-case $enable_sjlj_exceptions in
-yes)
-
-$as_echo "#define LIBGO_SJLJ_EXCEPTIONS 1" >>confdefs.h
-
-  ;;
-no)
-  ;;
-*)
-  as_fn_error "unable to detect exception model" "$LINENO" 5
-  ;;
-esac
-
 for ac_header in sched.h sys/file.h sys/mman.h syscall.h sys/epoll.h sys/inotify.h sys/ptrace.h sys/syscall.h sys/user.h sys/utsname.h sys/select.h sys/socket.h net/if.h net/if_arp.h net/route.h netpacket/packet.h sys/prctl.h sys/mount.h sys/vfs.h sys/statfs.h sys/timex.h sys/sysinfo.h utime.h linux/ether.h linux/fs.h linux/reboot.h netinet/icmp6.h netinet/in_syst.h netinet/ip.h netinet/ip_mroute.h netinet/if_ether.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`

libgo/configure.ac

@@ -473,56 +473,6 @@ AC_C_BIGENDIAN
 
 GCC_CHECK_UNWIND_GETIPINFO
 
-AC_ARG_ENABLE(sjlj-exceptions,
-  AC_HELP_STRING([--enable-sjlj-exceptions],
-		 [force use of builtin_setjmp for exceptions]),
-  [case "$enableval" in
-   yes|no|auto) ;;
-   *) AC_MSG_ERROR([unknown argument to --enable-sjlj-exceptions]) ;;
-   esac],
-  [enable_sjlj_exceptions=auto])
-
-AC_CACHE_CHECK([whether to use setjmp/longjmp exceptions],
-[libgo_cv_lib_sjlj_exceptions],
-[AC_LANG_CONFTEST(
-  [AC_LANG_SOURCE([
-void bar ();
-void clean (int *);
-void foo ()
-{
-  int i __attribute__ ((cleanup (clean)));
-  bar();
-}
-])])
-CFLAGS_hold=$CFLAGS
-CFLAGS="--save-temps -fexceptions"
-libgo_cv_lib_sjlj_exceptions=unknown
-AS_IF([ac_fn_c_try_compile],
-  [if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then
-    libgo_cv_lib_sjlj_exceptions=yes
-  elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then
-    libgo_cv_lib_sjlj_exceptions=no
-  fi])
-CFLAGS=$CFLAGS_hold
-rm -f conftest*
-])
-
-if test "$enable_sjlj_exceptions" = "auto"; then
-  enable_sjlj_exceptions=$libgo_cv_lib_sjlj_exceptions
-fi
-
-case $enable_sjlj_exceptions in
-yes)
-  AC_DEFINE(LIBGO_SJLJ_EXCEPTIONS, 1,
-	[Define if the C++ compiler is configured for setjmp/longjmp exceptions.])
-  ;;
-no)
-  ;;
-*)
-  AC_MSG_ERROR([unable to detect exception model])
-  ;;
-esac
-
 AC_CHECK_HEADERS(sched.h sys/file.h sys/mman.h syscall.h sys/epoll.h sys/inotify.h sys/ptrace.h sys/syscall.h sys/user.h sys/utsname.h sys/select.h sys/socket.h net/if.h net/if_arp.h net/route.h netpacket/packet.h sys/prctl.h sys/mount.h sys/vfs.h sys/statfs.h sys/timex.h sys/sysinfo.h utime.h linux/ether.h linux/fs.h linux/reboot.h netinet/icmp6.h netinet/in_syst.h netinet/ip.h netinet/ip_mroute.h netinet/if_ether.h)
 
 AC_CHECK_HEADERS([linux/filter.h linux/if_addr.h linux/if_ether.h linux/if_tun.h linux/netlink.h linux/rtnetlink.h], [], [],

libgo/runtime/go-unwind.c

@@ -141,7 +141,7 @@ __go_check_defer (_Bool *frame)
 
   hdr = (struct _Unwind_Exception *) g->exception;
 
-#ifdef LIBGO_SJLJ_EXCEPTIONS
+#ifdef __USING_SJLJ_EXCEPTIONS__
   _Unwind_SjLj_Resume_or_Rethrow (hdr);
 #else
 #if defined(_LIBUNWIND_STD_ABI)