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The following code prevents GCC compiler inline a specific function.

void __attribute__ ((noinline)) my_func() { ... }

I wish to prevent gcc from inlining all functions. Can I do it without adding the attribute to all functions?

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The global option to avoid inlining (when using -O2 or other optimisation flags) is -fno-inline

-fno-inline Do not expand any functions inline apart from those marked with the always_inline attribute. This is the default when not optimizing.

(source: https://gcc.gnu.org/onlinedocs/gcc-4.9.1/gcc/Optimize-Options.html)

If you're doing this to reduce code size, I suggest that you throw in the -Os option (optimize for size)

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