Fwd: Compiling with -fdata-sections doesn't put the constant in the section expected

[Clément Péron <peron.clem@xxxxxxxxx>]

Hi,

In the manual, it says that : -fdata-sections
-ffunction-sections-fdata-sections Place each function or data item
into its own section in the output file if the target supports
arbitrary sections


I try to use it but the result is not the one as expected.

gcc --version
gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2

And i compile with these arguments :
gcc -c -o hello.o -ffunction-sections -fdata-sections hello.c

I can see with objdump that .text sections are good.

I have different .text.__function__

But i have only one .rodata instead of different .rodata.__function__

Thanks for your help,

Clement

/*------------ hello.c ---------------*/

#include <stdio.h>
#include <stdlib.h>

void used_function();

int main(){

printf("On-the fly string"); //goto .rodata

used_function();

return 0;

}

void unused_function(){
    const char var9[] = "String const";
    char var3[] = "String not const"; //goto .text.unused_function and
is removed by the linker
    printf("I would like to optimize this string !"); //goto
.rodata.str1.8 and isn't removed by the linker
    printf("%s %s", var9, var3);
}

void used_function(){
    printf("A string used here with the same size 2"); //goto .rodata.str1.8
}