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coptimizationarmarmcc

ARMCC remove unused variables

I'm trying to remove unused code with Keil ARM tools that use ARMCC compiler. I've previously used GCC based compilers for ARM and I could easily remove the unused code with:

-fdata-sections -ffunction-sections

For ARMCC i found similar flag

--split_sections

but it works only with functions and not with variables.

Is there any way to remove unused variables with ARMCC?

Edit:

For example giving the following library code:

lib.c :

static int veryBigArray[1000000UL];

int func1() { ... }

int func2() { memset(veryBigArray, 0, sizeof(veryBigArray); }

and my project code:

project.c:

int main(void)
{
   func1();
}

I want to remove func2() and veryBigArray using compiler/linker optimizations.

Solution

  • The official answer that we received from ARM support is that currently (ARMCC v5.03 [Build 24]) there is no such option available in ARMCC compiler - They just never thought about such scenario.

    Hopefully it will be added to future ARMCC versions.