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include/linux/kconfig.h

include/linux/kconfig.h includes include/generated/autoconf.h.

Some macros defined in kconfig.h include

`IS_BUILTIN(OPT)`	Evaluates to 1 if `CONFIG_OPT` is set to `y` and to 0 otherwise. For boolean options, this macro is equivalent to `IS_ENABLED(OPT)`.
`IS_MODULE(OPT)`	Evaluates to 1 if `CONFIG_OPT` is set to `m` and to 0 otherwise. For boolean options, this macro is equivalent to `IS_ENABLED(OPT)`.
`IS_ENABLED(OPT)`	Evaluates to 1 if `CONFIG_OPT` is set to `y` or `m` and to 0 otherwise. For boolean options, this macro is equivalent to `IS_ENABLED(OPT)`.
`IS_REACHABLE(OPT)`	EValuates to 1 if the currently compiled code can call a function defined in code compiled based on `CONFIG_OPT`. Similar to `IS_ENABLED()` but returns 0 when invoked from built-in code when `CONFIG_OPT` is set to `m`.

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Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/Linux/ke...', 1759398026, '216.73.216.42', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Linux/kernel/source/include/linux/kconfig_h(42): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78