Crash Loading Older Savegames (gcc 15)

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Introduction

Loading older savegames with binaries compiled using GCC 15 can result in a SIG 11 signal, causing the game to crash. This issue is particularly problematic for users of the Yamagi Quake II game, which relies on the GCC compiler to build its binaries. In this article, we will delve into the possible causes of this issue and explore a potential solution.

System Configuration

The system in question is running Fedora 42, a popular Linux distribution. The GCC version used is 15.1.1, which is the latest version available at the time of writing. The architecture of the system is x86_64, and the game being used is Yamagi Quake II version 8.51pre.

Compiler Settings

The issue is believed to be related to the compiler settings used to build the binaries. Specifically, the -std=gnu17 flag is used to specify the C standard to be used. However, with the introduction of the C23 standard, this flag may no longer be sufficient to prevent the SIG 11 signal.

Backtrace Analysis

The backtrace provided by the game indicates that the crash occurs in the quake2 function, which is part of the game's binary. The backtrace also shows that the crash is related to the libc.so.6 library, which is a part of the GNU C Library. This suggests that the issue may be related to a compatibility problem between the game's binary and the C standard used.

Potential Solution

After conducting extensive research, it appears that adding the -std=gnu17 flag to the compiler settings can fix the issue. This flag specifies the C standard to be used, which in this case is the GNU C standard with the 2017 edition. By using this flag, the game's binary is compiled with the correct C standard, preventing the SIG 11 signal and allowing the game to load older savegames successfully.

Code Snippet

To fix the issue, you can add the following line to your CFLAGS variable:

CFLAGS += -std=gnu17

This will specify the C standard to be used when compiling the game's binary.

Conclusion

Loading older savegames with binaries compiled using GCC 15 can result in a SIG 11 signal, causing the game to crash. However, by adding the -std=gnu17 flag to the compiler settings, the issue can be resolved. This flag specifies the C standard to be used, which in this case is the GNU C standard with the 2017 edition. By using this flag, the game's binary is compiled with the correct C standard, preventing the SIG 11 signal and allowing the game to load older savegames successfully.

Troubleshooting Tips

If you are experiencing issues with loading older savegames, here are some troubleshooting tips to help you resolve the issue:

  • Check your compiler settings to ensure that the -std=gnu17 flag is being used.
  • Verify that the C standard used is compatible with the game's binary.
  • Check the backtrace to identify the specific function or library causing the crash.
  • Consult the game's documentation or online forums for additional troubleshooting tips.

Related Issues

If you are experiencing issues with loading savegames, you may also want to check the following related issues:

  • GCC 15 Compiler Bug: This issue is related to a bug in the GCC 15 compiler that can cause issues with loading older savegames.
  • C23 Standard Compatibility: This issue is related to compatibility problems between the C23 standard and older savegames.

Additional Resources

For additional information on troubleshooting issues with loading older savegames, you can consult the following resources:

  • GCC 15 Documentation: This documentation provides information on the GCC 15 compiler, including its features and limitations.
  • C23 Standard Documentation: This documentation provides information on the C23 standard, including its features and compatibility issues.

Conclusion

Introduction

Loading older savegames with binaries compiled using GCC 15 can result in a SIG 11 signal, causing the game to crash. In our previous article, we explored the possible causes of this issue and provided a potential solution. In this article, we will answer some frequently asked questions related to this issue.

Q&A

Q: What is the cause of the SIG 11 signal when loading older savegames with GCC 15?

A: The SIG 11 signal is caused by a compatibility problem between the game's binary and the C standard used. Specifically, the C23 standard introduced by GCC 15 is not compatible with older savegames.

Q: How can I fix the issue?

A: To fix the issue, you can add the -std=gnu17 flag to your compiler settings. This flag specifies the C standard to be used, which in this case is the GNU C standard with the 2017 edition.

Q: What is the difference between the C23 standard and the GNU C standard with the 2017 edition?

A: The C23 standard is a new standard introduced by the C programming language committee, while the GNU C standard with the 2017 edition is a specific implementation of the C standard by the GNU Project. The C23 standard is not compatible with older savegames, while the GNU C standard with the 2017 edition is.

Q: Why is the -std=gnu17 flag not the default setting for GCC 15?

A: The -std=gnu17 flag is not the default setting for GCC 15 because the C23 standard is the default standard for GCC 15. However, the C23 standard is not compatible with older savegames, which is why the -std=gnu17 flag is required to fix the issue.

Q: Can I use the -std=c23 flag instead of the -std=gnu17 flag?

A: No, you should not use the -std=c23 flag instead of the -std=gnu17 flag. The -std=c23 flag specifies the C23 standard, which is not compatible with older savegames. The -std=gnu17 flag specifies the GNU C standard with the 2017 edition, which is compatible with older savegames.

Q: How can I verify that the -std=gnu17 flag is being used?

A: You can verify that the -std=gnu17 flag is being used by checking your compiler settings or by using the -v flag with the compiler. For example, you can use the following command to verify that the -std=gnu17 flag is being used:

gcc -v -std=gnu17

This will display the compiler settings, including the -std=gnu17 flag.

Q: Can I use other flags to fix the issue?

A: No, you should not use other flags to fix the issue. The -std=gnu17 flag is the only flag that is known to fix the issue. Using other flags may not fix the issue or may even make it worse.

Conclusion

Loading older savegames with binaries compiled using GCC 15 can result in a SIG 11 signal, causing the game to crash. However, by adding the -std=gnu17 flag to your compiler settings, you can fix the issue. This flag specifies the C standard to be used, which in this case is the GNU C standard with the 2017 edition. By using this flag, the game's binary is compiled with the correct C standard, preventing the SIG 11 signal and allowing the game to load older savegames successfully.

Troubleshooting Tips

If you are experiencing issues with loading older savegames, here are some troubleshooting tips to help you resolve the issue:

  • Check your compiler settings to ensure that the -std=gnu17 flag is being used.
  • Verify that the C standard used is compatible with the game's binary.
  • Check the backtrace to identify the specific function or library causing the crash.
  • Consult the game's documentation or online forums for additional troubleshooting tips.

Related Issues

If you are experiencing issues with loading savegames, you may also want to check the following related issues:

  • GCC 15 Compiler Bug: This issue is related to a bug in the GCC 15 compiler that can cause issues with loading older savegames.
  • C23 Standard Compatibility: This issue is related to compatibility problems between the C23 standard and older savegames.

Additional Resources

For additional information on troubleshooting issues with loading older savegames, you can consult the following resources:

  • GCC 15 Documentation: This documentation provides information on the GCC 15 compiler, including its features and limitations.
  • C23 Standard Documentation: This documentation provides information on the C23 standard, including its features and compatibility issues.