Search notes:

/usr/lib/x86_64-linux-gnu

Some interesting object files I've found in /usr/lib/x86_64-linux-gnu in a Debian 11 installation include:
Mcrt1.o
Scrt1.o Apparently sometimes also found in /usr/lib/Scrt1.o
crt1.o Apparently sometimes also found in /usr/lib/crt1.o
crti.o Function prologs for the .init and .fini sections (including _init and _fini symbols which trigger the linker to generate DT_INIT/DT_FINI dynamic ELF tags)
crtn.o Function epilogs for the .init and .fini sections.
gcrt1.o
grcrt1.o
libBrokenLocale.a
libBrokenLocale.so
libanl.a
libanl.so
libc.a Apparentlys sometimes also found in /usr/lib/libc.a
libc.so
libc_nonshared.a
libdl.a
libdl.so
libg.a
libm-2.31.a
libm.a
libm.so
libmcheck.a
libmvec.a
libmvec.so
libnss_compat.so
libnss_dns.so
libnss_files.so
libnss_hesiod.so
libpthread.a
libpthread.so
libresolv.a
libresolv.so
librpcsvc.a
librt.a
librt.so
libthread_db.so
libutil.a
libutil.so
rcrt1.o

See also

/usr/lib/gcc/x86_64-linux-gnu/VERSION 
$ apt-file show libc6-dev | grep /usr/lib/x86_64-linux-gnu
The parent directory /usr/lib

Links

Mini FAQ about the misc libc/gcc crt files.

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/Linux/fh...', 1758207399, '216.73.216.150', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Linux/fhs/usr/lib/x86_64-linux-gnu/index(89): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78