Question 266836 in Ubuntu Question posted in
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Ubuntu – clang warning argument unused during compilation for -fsanitize-address-outline-instrumentation

I am trying to test out whether the flag -fsanitize-address-outline-instrumentation works for the LLVM Clang compiler.

Ubuntu clang version 15.0.7

I have created an exemplary program:

main.c

#include "stdio.h"

static inline void printFunc(void)
{
    printf("Test string rn");
}

int main(void)
{
    printFunc();

    return 0;
}

I wanted to verify whether the printFunc would be inlined or not, depeneding on whether the -fsanitize-address-outline-instrumentation compilation flag is added. When I try to compile the file, the compiler returns during compilation:

lukasz@lp:/tmp/test$ clang main.c -o main -fsanitize-address-outline-instrumentation
clang: warning: argument unused during compilation: '-fsanitize-address-outline-instrumentation' [-Wunused-command-line-argument]

I cannot figure out why is the parameter ignored.

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2

Answers


  1. Chosen as BEST ANSWER
    0

    The reason it was not working is because I did not add the -fsanitize=address as well. So when compiled with -fsanitize=address -fsanitize-address-outline-instrumentation it works- the generated binary has different size.

    However, the produced binary is actually bigger than before. So I am not sure this solves the issue.


  2. 0

    The proper way for disabling inlining is to use the -fno-inline-functions. But for the inlining to even work in the first place, optimization has to be used, i.e. -O2 or -Oz.

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