Search notes:

gcc -Qn

By default, gcc writes the compiler version to an object file's .comment section: 
$ echo 'void f() {}' | gcc     -xc -c -o f.obj -
$ readelf -p .comment f.obj

String dump of section '.comment':
  [     1]  GCC: (Debian 10.2.1-6) 10.2.1 20210110
With -Qn, such a section is not written. 
$ echo 'void f() {}' | gcc -Qn -xc -c -o f.obj -
$ readelf -p .comment f.obj
readelf: Warning: Section '.comment' was not dumped because it does not exist!

Index

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/developm...', 1759406894, '216.73.216.42', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/languages/C-C-plus-plus/GCC/options/Q/n(42): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78