/usr/lib/gcc/x86_64-linux-gnu/4.8/plugin/include/config.h is in gcc-4.8-plugin-dev 4.8.5-4ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #ifndef GCC_CONFIG_H
#define GCC_CONFIG_H
#ifdef GENERATOR_FILE
#error config.h is for the host, not build, machine.
#endif
#include "auto-host.h"
#ifdef IN_GCC
# include "ansidecl.h"
#endif
#endif /* GCC_CONFIG_H */
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