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GCC and Precompiled Headers
Precompiled headers aim to optimize C compilation by serializing the preprocessed state of common headers. However, their use in real-world scenarios raises concerns about triggering rebuilds.
When to Rebuild Precompiled Headers
GCC requires a single common header that is included first in all source files. Any subsequent #define or header #include directives will not be precompiled. Therefore, rebuilds are necessary if:
Coding Style for Precompiled Headers
To avoid these rebuild issues, GCC recommends a restrictive coding style:
However, this style may not always align with real-world coding practices.
GCC Limitations and Complexity
GCC's handling of precompiled headers requires extensive manual configuration in the Makefile. There are no readily available templates that fully address the potential pitfalls. For example, when multiple libraries are built using precompiled headers, complex shell scripts are required to detect and rebuild modified headers.
Alternative Approaches
Due to the complexities of GCC's precompiled header implementation, it may be preferable to explore alternative approaches such as:
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