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Oct 13, 2025 by thesweetdesigns.com 144 views

Bug: Compilation Error: 'void __builtin_memmove(void, const void*, long long unsigned int)' forming offset 4 is out of the bounds [0, 4] [-Werror=array-bounds=]' #5975/#5577**

Introduction In this article, we will discuss a bug that occurs during compilation using MingW64 (GCC 14.2.0) and its resolution. The bug is related to an array bounds error, which is triggered when the compiler tries to move data using the __builtin_memmove function. We will explore the steps to reproduce the bug, the expected behavior, and the platform details.

Describe the Bug The bug described in #5975 and #5577 is still present in MingW64 (GCC 14.2.0). To resolve this issue, a simple comment was added in the MDLFileData.h file at line 879. However, this raises a question about the usefulness of the reserve function in this context. The reserve function ensures that the capacity of the std::vector<bool> is at least 12, but in this case, the minimal capacity is 32, which is equivalent to 32 bits of an integer.

To Reproduce To reproduce the bug, follow these steps:

Install the necessary tools: Make sure you have the required tools installed, including CMake, GCC 14.2.0, MSYS2, Mingw64, and Codeblocks 20.03.
Create a project: Create a new project using CMake and add the necessary files to the project.
Compile the project: Use the make all command to compile the project.
See the error: The compilation will fail, and you will see the following error message:

Compilation Error: 'void* __builtin_memmove(void*, const void*, long long unsigned int)' forming offset 4 is out of the bounds [0, 4] [-Werror=array-bounds=]'

Expected Behavior The expected behavior is that the compilation should succeed without any errors.

Platform Details The bug was observed on the following platforms:

GCC 14.2.0: The compiler version that is causing the issue.
MSYS2 / Mingw64: The build environment that is being used.
Codeblocks 20.03: The integrated development environment (IDE) that is being used.
Windows 10: The operating system on which the bug is being observed.

Resolution To resolve the bug, a comment was added in the MDLFileData.h file at line 879. This comment prevents the compiler from trying to move data using the __builtin_memmove function, which is causing the array bounds error.

Discussion The reserve function is used to ensure that the capacity of the std::vector<bool> is at least 12. However, in this case, the minimal capacity is 32, which is equivalent to 32 bits of an integer. This raises a question about the usefulness of the reserve function in this context. It is possible that the reserve function is not necessary in this case, and the compiler is able to optimize the code without it.

Conclusion In conclusion, the bug described in #5975 and #5577 is still present in MingW64 (GCC 14.2.0). To resolve this issue, a simple comment was added in the MDLFileData.h file at line 879. However, this raises a question about the usefulness of the reserve function in this context. Further investigation is needed to determine the root cause of the bug and to find a more permanent solution.

Recommendations Based on the analysis of the bug, the following recommendations are made:

Use a more recent version of GCC: The bug may be fixed in a more recent version of GCC.
Use a different build environment: The bug may be specific to the MSYS2 / Mingw64 build environment.
Use a different IDE: The bug may be specific to the Codeblocks 20.03 IDE.
Investigate the usefulness of the reserve function: Further investigation is needed to determine the usefulness of the reserve function in this context.

Future Work Future work includes:

Investigating the root cause of the bug: Further investigation is needed to determine the root cause of the bug.
Finding a more permanent solution: A more permanent solution is needed to resolve the bug.
Testing the bug on different platforms: The bug should be tested on different platforms to determine if it is specific to the MSYS2 / Mingw64 build environment or the Codeblocks 20.03 IDE.
Bug: Compilation Error: 'void __builtin_memmove(void, const void*, long long unsigned int)' forming offset 4 is out of the bounds [0, 4] [-Werror=array-bounds=]' #5975/#5577**

Q&A: Frequently Asked Questions

Q: What is the bug described in #5975 and #5577? A: The bug described in #5975 and #5577 is a compilation error that occurs when using MingW64 (GCC 14.2.0). The error is related to an array bounds error, which is triggered when the compiler tries to move data using the __builtin_memmove function.

Q: What is the expected behavior? A: The expected behavior is that the compilation should succeed without any errors.

Q: What is the platform on which the bug is being observed? A: The bug is being observed on the following platforms:

GCC 14.2.0: The compiler version that is causing the issue.
MSYS2 / Mingw64: The build environment that is being used.
Codeblocks 20.03: The integrated development environment (IDE) that is being used.
Windows 10: The operating system on which the bug is being observed.

Q: How to reproduce the bug? A: To reproduce the bug, follow these steps:

Install the necessary tools: Make sure you have the required tools installed, including CMake, GCC 14.2.0, MSYS2, Mingw64, and Codeblocks 20.03.
Create a project: Create a new project using CMake and add the necessary files to the project.
Compile the project: Use the make all command to compile the project.
See the error: The compilation will fail, and you will see the following error message:

Compilation Error: 'void* __builtin_memmove(void*, const void*, long long unsigned int)' forming offset 4 is out of the bounds [0, 4] [-Werror=array-bounds=]'

Q: What is the resolution of the bug? A: To resolve the bug, a comment was added in the MDLFileData.h file at line 879. This comment prevents the compiler from trying to move data using the __builtin_memmove function, which is causing the array bounds error.

Q: Is the reserve function useful in this context? A: The reserve function is used to ensure that the capacity of the std::vector<bool> is at least 12. However, in this case, the minimal capacity is 32, which is equivalent to 32 bits of an integer. This raises a question about the usefulness of the reserve function in this context.

Q: What are the recommendations for resolving the bug? A: Based on the analysis of the bug, the following recommendations are made:

Use a more recent version of GCC: The bug may be fixed in a more recent version of GCC.
Use a different build environment: The bug may be specific to the MSYS2 / Mingw64 build environment.
Use a different IDE: The bug may be specific to the Codeblocks 20.03 IDE.
Investigate the usefulness of the reserve function: Further investigation is needed to determine the usefulness of the reserve function in this context.

Q: What is the future work for resolving the bug? A: Future work includes:

Investigating the root cause of the bug: Further investigation is needed to determine the root cause of the bug.
Finding a more permanent solution: A more permanent solution is needed to resolve the bug.
Testing the bug on different platforms: The bug should be tested on different platforms to determine if it is specific to the MSYS2 / Mingw64 build environment or the Codeblocks 20.03 IDE.