GCC

https://www.cs.oberlin.edu/~kuperman/help/make.html

https://latedev.wordpress.com/2014/04/22/common-c-error-messages-2-unresolved-reference/

https://appuals.com/fix-cannot-execute-binary-file-exec-format-error-ubuntu/

https://www.commentcamarche.net/forum/affich-17553555-error-exec-format-error

https://archive.org/details/B-001-002-835

https://www3.ntu.edu.sg/home/ehchua/programming/cpp/gcc_make.html

http://www.cplusplus.com/forum/unices/142922/

https://www.includehelp.com/c-programs/id-returned-1-exit-status-undefined-reference-to-main-error-in-c.aspx

https://openclassrooms.com/forum/sujet/probleme-error-ld-returned-1-exit

https://helpmanual.io/help/g++/

https://www.slothparadise.com/c-libraries-linking-compiling/

https://www.mail-archive.com/search?l=libunwind-devel@nongnu.org&q=subject:%22%5C%5BLibunwind%5C-devel%5C%5D+Backtrace+performance+on+x86%5C-64+based+on+Dwarf%09info%22&o=newest&f=1

https://www.slothparadise.com/c-libraries-linking-compiling/

https://cs.baylor.edu/~donahoo/tools/gdb/tutorial.html

https://stackoverflow.com/questions/33837828/c-c-passing-macros-that-take-arguments-on-the-compile-line

https://www.systutorials.com/131/convert-string-to-int-and-reverse/

https://cs.baylor.edu/~donahoo/tools/gdb/tutorial.html

http://perso.ens-lyon.fr/daniel.hirschkoff/C_Caml/docs/doc_gdb.pdf

https://web.eecs.umich.edu/~sugih/pointers/summary.html

https://news.ycombinator.com/item?id=14733829

https://ubuntuforums.org/showthread.php?t=1983130

https://www.cs.bu.edu/teaching/cpp/writing-makefiles/