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+<think>
+Okay, so I have this problem where after a git bisect, the first bad commit was identified as 37746c5eacf309fa019ea0fa45f776c36c561457. The commit message mentions adding -fstack-protector to the linker using libtool's -Wc argument because libtool was swallowing it otherwise. But now, when I run QEMU, I'm getting an undefined reference error: `qemu-1.4.0/stubs/arch-query-cpu-def.c:6: undefined reference to '__stack_chk_guard'`.
+
+Hmm, the commit says that adding -fstack-protector was necessary, but perhaps it's not enough or there's another issue. Maybe __stack_chk_guard is part of a library I'm missing? Let me think about where this symbol comes from.
+
+I know that __stack_chk_guard is typically provided by the compiler when using stack protection (-fstack-protector). If adding -fstack-protector didn't fix it, maybe the linker isn't getting the flag properly. Alternatively, perhaps some object files or libraries are being built without this flag, causing the missing symbol.
+
+Wait, looking back at the commit, Marc-André Lureau added -Wc,-fstack-protector to libtool's arguments. So when libtool is compiling and linking, it should pass that flag. But in the build-sys change, maybe not all parts of QEMU are being passed this flag.
+
+I should check if every relevant part of QEMU is built with this flag. Perhaps some Makefiles or rules aren't including it, leading to certain files like arch-query-cpu-def.c not getting the necessary stack protection.
+
+Also, I recall that if you're using a C library like glibc, __stack_chk_guard might be in libc. But maybe the build environment is different, or perhaps static builds are causing issues where dynamic libraries aren't loaded properly, hence missing symbols.
+
+Another thought: after bisecting to this commit, any changes after it could have fixed the issue, but since this is the first bad commit, I'm likely on a system that's now missing something because of how stack protection was applied. Maybe there's an error in how the flag is passed or where it's being applied.
+
+I should verify if all binaries and shared libraries are built with -fstack-protector. Perhaps certain parts were overlooked, leading to some components not including __stack_chk_guard.
+
+Additionally, I could try rebuilding after this commit but explicitly ensuring that every target (like qemu-system-x86) is built with the necessary flags. Maybe adding export CFLAGS and LDFLAGS in the environment variables might help pass along the flags correctly.
+
+Alternatively, perhaps the way libtool handles -Wc isn't propagating the flag to all invocations, so a more direct approach to set the linker's stack protection would be needed, like adding it to LDFLAGS in the Makefile.
+
+Wait, maybe the commit didn't cover all build configurations. For example, if some parts of QEMU use their own Makefiles not handled by libtool, they might not receive the -fstack-protector flag. That could explain why __stack_chk_guard is undefined in certain files.
+
+I think I should check the configure script and make sure it's passing the necessary flags everywhere. Also, perhaps running a make clean and then rebuilding with verbose options would help identify if all components are getting the correct compiler and linker flags.
+
+Another angle: the error points to arch-query-cpu-def.c. Maybe that specific file isn't being compiled with -fstack-protector. I should check which Makefile builds this file and ensure it's including the stack protection flag.
+
+Alternatively, maybe there's a missing dependency or an older version of a library that doesn't include __stack_chk_guard when built without proper flags. But since the commit was about adding those flags, perhaps it's a build configuration issue rather than a missing package.
+
+I could also try compiling QEMU with more debug output to see exactly which files are being compiled with which flags and ensure that all relevant parts have -fstack-protector.
+
+In summary, the problem arises because after applying the commit that adds -fstack-protector via libtool's -Wc argument, some components aren't receiving the flag correctly, leading to a missing symbol. To fix this, I need to verify that every part of QEMU is built with the necessary stack protection flags and that __stack_chk_guard is properly provided by all compiled objects and libraries.
+</think>
+
+The issue arises because the commit adds `-fstack-protector` via libtool's `-Wc`, but not all parts of QEMU receive this flag, causing `__stack_chk_guard` to be undefined. To fix this:
+
+1. **Check Build Flags**: Ensure every target (e.g., qemu-system-x86) is built with `-fstack-protector`. Verify Makefiles and configure scripts pass these flags.
+
+2. **Rebuild**: Perform a clean build with verbose options to confirm all components use the correct flags.
+
+3. **Modify Configuration if Needed**: If some parts aren't covered by libtool, update their Makefiles or environment variables to include `-fstack-protector`.
+
+**Answer:** Ensure all QEMU components are built with `-fstack-protector` by verifying build configurations and rebuilding to fix the undefined symbol error.
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