ARM Compiler toolchain v4.1 for µVision Using the Compiler

Compiler Coding Practices
5.13 Guarding against multiple inclusion of header files
Guarding against multiple inclusion of header files:
• improves compilation time
• reduces the size of object files generated using the -g compiler command-line option,
which can speed up link time
• avoids compilation errors that arise from including the same code multiple times.
For example:
/* foo.h */
#ifndef FOO_H
#define FOO_H 1
...
#endif
/* bar.c */
#ifndef FOO_H
#include "foo.h"
#endif
5.13.1 See also
Reference
Compiler Reference:
• -g on page 3-47.
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