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Walk through the C compilation pipeline: preprocessor, compiler, assembler, and linker. Start with a normal hello world, inspect macros and generated assembly, and end by producing a running binary that has no main() function.
Refactor a slow, single-threaded C file downloader that fetches files sequentially into a multi-threaded program using POSIX Threads (pthreads) to achieve concurrent downloads.
Compile a small C loop with -O2 -S, inspect the generated assembly, report how many add instructions gcc produced and see how much it has optimized the equasion.
Run gcc -E on a small C program and find the exact line where the preprocessor expanded a macro into a printf call.
Produce a valid ELF binary that runs and exits cleanly, but does not define a main() function.