Update cheatsheets

gcc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gcc
+
+> Preprocess and compile C and C++ source files, then assemble and link them together.
+> More information: <https://gcc.gnu.org>.
+
+- Compile multiple source files into an executable:
+
+`gcc {{path/to/source1.c path/to/source2.c ...}} -o {{path/to/output_executable}}`
+
+- Show common warnings, debug symbols in output, and optimize without affecting debugging:
+
+`gcc {{path/to/source.c}} -Wall -g -Og -o {{path/to/output_executable}}`
+
+- Include libraries from a different path:
+
+`gcc {{path/to/source.c}} -o {{path/to/output_executable}} -I{{path/to/header}} -L{{path/to/library}} -l{{library_name}}`
+
+- Compile source code into Assembler instructions:
+
+`gcc -S {{path/to/source.c}}`
+
+- Compile source code into an object file without linking:
+
+`gcc -c {{path/to/source.c}}`
+
+- Optimize the compiled program for performance:
+
+`gcc {{path/to/source.c}} -O{{1|2|3|fast}} -o {{path/to/output_executable}}`