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Asked: 2026-06-15T17:18:48+00:00

I’m trying to override some standard library functions using LD_PRELOAD. However, I notice that

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I’m trying to override some standard library functions using LD_PRELOAD. However, I notice that my version is never called for some functions, for example, the gettimeofday one. I suspect gcc uses an inbuilt version for some of these functions.

Is there a way I can tell gcc to not use inbuilt standard library functions.

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1 Answer

  1. Editorial Team

    Use the gcc switch -fno-builtin. Quoting from the gcc manual:

    -fno-builtin

    Don’t recognize built-in functions that do not begin with `_builtin‘ as prefix.

    More details: http://gcc.gnu.org/onlinedocs/gcc-3.0/gcc_3.html#SEC7

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