GCC 11.1.10 ld: warning: .init_array section has zero size

[Chris Packham]

On 18/06/21 12:30 pm, Alan Modra wrote:
> On Thu, Jun 17, 2021 at 09:20:56PM +0000, Chris Packham via Binutils wrote:
>>>> warning: .init_array section has zero size
>> I'm in the process of getting a GCC bugzilla account so I was also going
>> to report there.
> Before doing that, inspect all of the object files you are linking
> with readelf -SW.  (Use gcc -v to see the linker command line, and all
> of the objects/libraries involved, or link with -Wl,-t to have the
> linker report files it links.)  One or more of them will have a zero
> size .init_array section.  If they were objects created by gcc from
> source or supplied with the compiler (crtbegin*.o, crtend*.o) then a
> gcc bug report is appropriate.  If they are other startup files, libc
> objects or assembly source objects you probably shouldn't complain
> about gcc.
>
Looks like crtbegin.o has a zero-sized .init_array/.fini_array

x-tool@063c4281c760:~$ readelf -SW 
/home/x-tool/x-tools/arm-unknown-linux-gnueabi/lib/gcc/arm-unknown-linux-gnueabi/11.1.0/crtbegin.o
There are 13 section headers, starting at offset 0x2bc:

Section Headers:
   [Nr] Name              Type            Addr     Off    Size   ES Flg 
Lk Inf Al
   [ 0]                   NULL            00000000 000000 000000 00      
0   0  0
   [ 1] .text             PROGBITS        00000000 000034 000000 00  AX  
0   0  1
   [ 2] .data             PROGBITS        00000000 000034 000004 00  WA  
0   0  4
   [ 3] .bss              NOBITS          00000000 000038 000000 00  WA  
0   0  1
   [ 4] .rodata           PROGBITS        00000000 000038 000090 00   A  
0   0  4
   [ 5] .init_array       INIT_ARRAY      00000000 0000c8 000000 04  WA  
0   0  1
   [ 6] .fini_array       FINI_ARRAY      00000000 0000c8 000000 04  WA  
0   0  1
   [ 7] .comment          PROGBITS        00000000 0000c8 00002f 01  MS  
0   0  1
   [ 8] .note.GNU-stack   PROGBITS        00000000 0000f7 000000 00      
0   0  1
   [ 9] .ARM.attributes   ARM_ATTRIBUTES  00000000 0000f7 000031 00      
0   0  1
   [10] .symtab           SYMTAB          00000000 000128 0000f0 10     
11  14  4
   [11] .strtab           STRTAB          00000000 000218 00002e 00      
0   0  1
   [12] .shstrtab         STRTAB          00000000 000246 000075 00      
0   0  1
Key to Flags:
   W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
   L (link order), O (extra OS processing required), G (group), T (TLS),
   C (compressed), x (unknown), o (OS specific), E (exclude),
   y (purecode), p (processor specific)