| Flag
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What it does
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| -O2
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Turn on all optional optimisations except or loop unrolling, function inlining, and strict aliasing optimizations
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| -pipe
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Speeds up compilation (has no effect on outputted file). Tells the compiler to use pipes rather than temporary files
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| -Wall
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Enable all compiler warnings (helps to spot potentially troublesome code)
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| -Wextra
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Print extra warning messages, specifically: A pointer is compared against integer zero with < , <= , > , or >= . (C++ only) An enumerator and a non-enumerator both appear in a conditional expression. (C++ only) Ambiguous virtual bases
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| -m16
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Generate 16-bit code
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| -ffreestanding
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Only use those features available in the freestanding environment
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| -nostdlib
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Don't include the standard library
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| -masm=intel
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Use Intel syntax for inline assembly rather than AT&T syntax (does this work?)
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| -fno-pic
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Tells the compiler to not generate position independent code
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| -mno-sse
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Floating point arguments to be passed onto the stack rather than sse registers.
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| -mno-sse2
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Floating point arguments to be passed onto the stack rather than sse2 registers.
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| -fno-stack-protector
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Disables stack protection
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| -I.
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Look for header files in the current folder
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