From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59850) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bCl1A-0004SV-Fx for qemu-devel@nongnu.org; Tue, 14 Jun 2016 05:52:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bCl18-0005TJ-KX for qemu-devel@nongnu.org; Tue, 14 Jun 2016 05:52:19 -0400 Received: from orth.archaic.org.uk ([2001:8b0:1d0::2]:57686) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bCl18-0005Sc-Cr for qemu-devel@nongnu.org; Tue, 14 Jun 2016 05:52:18 -0400 From: Peter Maydell Date: Tue, 14 Jun 2016 10:52:04 +0100 Message-Id: <1465897927-4719-3-git-send-email-peter.maydell@linaro.org> In-Reply-To: <1465897927-4719-1-git-send-email-peter.maydell@linaro.org> References: <1465897927-4719-1-git-send-email-peter.maydell@linaro.org> Subject: [Qemu-devel] [PATCH 2/5] configure: Don't allow user-only targets for unknown CPU architectures List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: patches@linaro.org, Riku Voipio , Laurent Vivier , Richard Henderson For the user-only targets, we need to know something about the host CPU architecture even if we are using the TCI interpreter rather than TCG. (In particular user-exec.c has code for handling signals that needs to know about that host's context structures.) Specifically forbid building the user-only targets on unknown CPU architectures, rather than allowing them to configure but then fail when building user-exec.c. This change drops supports for two configurations which were theoretically possible before: * linux-user targets on M68K hosts using TCI * linux-user targets on HPPA hosts using TCI We don't think anybody is actually trying to use these in practice, though: * interpreted TCG on a slow host CPU would be unusably slow * the m68k user-exec.c support is missing is_write detection so guest code which writes to the same page it is executing from was broken (will include any guest program using signals) * HPPA TCG backend support was dropped two and a half years ago with no complaints Signed-off-by: Peter Maydell --- configure | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/configure b/configure index 7ab4e0b..62f93e3 100755 --- a/configure +++ b/configure @@ -1217,6 +1217,13 @@ esac QEMU_CFLAGS="$CPU_CFLAGS $QEMU_CFLAGS" EXTRA_CFLAGS="$CPU_CFLAGS $EXTRA_CFLAGS" +# For user-mode emulation the host arch has to be one we explicitly +# support, even if we're using TCI. +if [ "$ARCH" = "unknown" ]; then + bsd_user="no" + linux_user="no" +fi + default_target_list="" mak_wilds="" -- 1.9.1