1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
<think>
Okay, I'm trying to build QEMU for AArch64 Linux userspace and I keep getting this error when running 'make'. The error message is a bit long, so let me try to break it down.
First, I see that there are some warnings about using certain functions like 'getpwuid', 'getpwnam_r', and 'getpwuid_r' in statically linked applications. These functions require shared libraries from glibc at runtime. That makes sense because if the application is static, it shouldn't rely on dynamic libraries, but perhaps QEMU is trying to use them anyway.
Then there's a more critical error about relocation truncation. The message says that R_AARCH64_LD64_GOTPAGE_LO15 can't fit against the symbol '__environ' in the .bss section of libc.a. It also mentions too many GOT entries for -fpic and suggests recompiling with -fPIC.
Hmm, I remember that when building for AArch64, position-independent code (PIC) is often required because of the way the linker works. Maybe some libraries aren't being built or linked with the correct PIC flags.
Looking at the command line, I see that '-march=armv8-a' and '-O2' are used, but maybe other flags like '-fPIC' are missing. Or perhaps the order in which libraries are linked is causing issues.
I also notice that the linker is warning about too many GOT entries for -fpic. This suggests that some objects or libraries aren't built with PIC enabled, leading to a GOT overflow. So I need to ensure all relevant parts of QEMU and its dependencies are compiled with PIC.
Let me check if the configure command includes any options related to static linking or PIC. If not, maybe adding '--enable-static' could help? Or perhaps it's better to avoid static linking altogether since shared libraries might be necessary.
Wait, another thought: the error mentions __environ in libc.a. Maybe the environment handling is conflicting with some other part of the build. I should check if there are any issues with how the C library is being linked.
I'm also thinking about whether it's possible that the version of GCC or Glibc installed on my system isn't compatible. Maybe updating to a newer version could resolve the relocation issue, but that seems more like a workaround than a proper fix.
Alternatively, perhaps I need to adjust the way libraries are included in the build process. Adding '-fPIC' explicitly might help, but I have to make sure it's applied to all necessary components, not just QEMU itself.
Another angle: the error occurs during linking with ld, so maybe the order of objects and archives matters here. Perhaps placing certain libraries earlier or later could prevent the GOT overflow.
I should also consider if there are any platform-specific flags needed for AArch64 that I'm missing. Maybe something related to the CPU architecture or ABI is causing the linker issues.
In summary, the main problems seem to be:
1. Static linking using functions that require dynamic libraries.
2. PIC-related issues leading to GOT overflow and relocation errors.
To fix this, I'll try modifying the build configuration to ensure all components are built with -fPIC where necessary and check if static linking is truly needed or if dynamic linking would resolve these issues. Adjusting the linker flags and ensuring proper PIC support might solve the problem.
</think>
The error you're encountering during the QEMU build process for AArch64 Linux userspace is due to two main issues:
1. **Static Linking Warnings**: The use of certain functions like `getpwuid`, `getpwnam_r`, and `getpwuid_r` in statically linked applications requires shared libraries from glibc at runtime.
2. **Linker Errors**: Relocation errors related to the Global Offset Table (GOT) indicate that some objects or libraries aren't built with Position-Independent Code (PIC), leading to a GOT overflow.
**Solution Steps:**
1. **Check Build Configuration:**
- Ensure all QEMU components and dependencies are compiled with `-fPIC` to support position-independent code.
- This might involve modifying the CFLAGS in your Makefile or configuration script to include `-fPIC`.
2. **Adjust Linker Flags:**
- The linker warning suggests adding more PIC objects or reordering the linking process. Ensure that libraries requiring PIC are correctly linked before others.
3. **Rebuild Dependencies:**
- Recompile any dependent libraries (like glib, libc) with `-fPIC` if they haven't been already.
- Verify that shared libraries are properly included during the build to avoid static linking issues.
4. **Update Build Commands:**
- If using a Makefile, modify the CFLAGS and LDFLAGS to include `-fPIC` where necessary.
- For example:
```make
CFLAGS += -march=armv8-a -O2 -pipe -fPIC
```
- Ensure that when linking shared libraries, you're using `gcc` with appropriate PIC flags.
5. **Check for Platform-Specific Issues:**
- Sometimes, specific CPU architectures require additional linker options or flags.
- Verify if there are any platform-specific guidelines for AArch64 builds that need to be followed.
By addressing these issues—ensuring all necessary components are built with PIC and adjusting the build process accordingly—you should resolve the linking errors and warnings.
|