[PATCH] Abort if gcc4 was used to compile qemu and kvm is not enabled

[Carlo Marcelo Arenas Belon <carenas-kLeDWSohozoJb6fo7hG9ng@public.gmane.org>]

Using gcc4 to compile qemu will generate broken code for its cpu emulation
but should be fine if using kvm only.

This will allow users that have no access to gcc4 on their platforms to at
least get kvm compiled and use it while preventing them to run a broken
qemu if kvm is not available.

This is not meant to be used in the long run when a solution to qemu's use
of gcc-3.x for code generation is finally resolved upstream, which is why
it is kept inside the KVM specific sections of the code only.

Signed-off-by: Carlo Marcelo Arenas Belon <carenas-kLeDWSohozoJb6fo7hG9ng@public.gmane.org>
---
 qemu/vl.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/qemu/vl.c b/qemu/vl.c
index 634fb34..549f008 100644
--- a/qemu/vl.c
+++ b/qemu/vl.c
@@ -8425,8 +8425,13 @@ int main(int argc, char **argv)
 #endif
 #ifdef USE_KVM
 	    case QEMU_OPTION_no_kvm:
+#if __GNUC__ >= 4
+		fprintf(stderr, "Can't run without kvm if compiled with gcc4\n");
+		exit(1);
+#else
 		kvm_allowed = 0;
 		break;
+#endif
 	    case QEMU_OPTION_no_kvm_irqchip:
 		kvm_irqchip = 0;
 		break;
@@ -8559,8 +8564,13 @@ int main(int argc, char **argv)
 #if USE_KVM
     if (kvm_allowed) {
 	if (kvm_qemu_init() < 0) {
+#if __GNUC__ >= 4
+	    fprintf(stderr, "Could not initialize KVM, can't run without kvm if compiled with gcc4\n");
+	    exit(1);
+#else
 	    fprintf(stderr, "Could not initialize KVM, will disable KVM support\n");
 	    kvm_allowed = 0;
+#endif
 	}
     }
 #endif
-- 
1.5.2.5


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