------- Comment #14 from f dot frumento at ngi dot it 2009-10-11 22:52 -------
(In reply to comment #0)
> Put this in main.c and build it with a 4.4-branch compiler using recent
> binutils:
>
> int main ()
> {
> return 0;
> }
>
> Versions:
>
> GNU assembler (GNU Binutils) 2.19.51.20090611
> i686-pc-linux-gnu-gcc (GCC) 4.4.1 20090611 (prerelease)
>
> % i686-pc-linux-gnu-gcc -c main.c; objdump --wide -h main.o | grep ALLOC
> 0 .text 0000000a 00000000 00000000 00000034 2**2 CONTENTS,
> ALLOC, LOAD, READONLY, CODE
> 1 .data 00000000 00000000 00000000 00000040 2**2 CONTENTS,
> ALLOC, LOAD, DATA
> 2 .bss 00000000 00000000 00000000 00000040 2**2 ALLOC
>
> % i686-pc-linux-gnu-gcc -c -g main.c; objdump --wide -h main.o | grep ALLOC
> 0 .text 0000000a 00000000 00000000 00000034 2**2 CONTENTS,
> ALLOC, LOAD, READONLY, CODE
> 1 .data 00000000 00000000 00000000 00000040 2**2 CONTENTS,
> ALLOC, LOAD, DATA
> 2 .bss 00000000 00000000 00000000 00000040 2**2 ALLOC
> 12 .eh_frame 00000034 00000000 00000000 000001c0 2**2 CONTENTS,
> ALLOC, LOAD, RELOC, READONLY, DATA
>
> We're using GAS's .cfi_startproc et cetera directives to generate debug
> information. But they only generate .eh_frame, not .debug_frame.
>
> I also noticed this problem on an ARM EABI target. ARM EABI does not use
> .eh_frame, only .debug_frame and .ARM.exidx.
>
> The easiest fix is to disable use of the CFI directives when we are trying to
> generate .debug_frame. I believe GCC used to generate both .debug_frame and
> .eh_frame for the same function. If we want both to gain the advantages of
> using CFI directives (e.g. potentially accurate across inline asm), then we
> need to teach gas to emit .debug_frame/.eh_frame/both as requested.
>
Hi all,
I've noticed ther behaviour differs for some platform
I've tested a cross compiler Gcc 4.4.1 on Cygwin and on Mac OSX 1.6,I've built
it from vanilla sources (gcc.gnu.org), the final target is M68K/Coldfire
on mac no problem at all while on cygwin i've got a "no memory region
...omissis... for .eh_frame" error message, i've built the same files just
checked out from svn repository. While i've solved disabling debug options i
can't use this setup for long, I've also modified the linker script as follow:
MEMORY
{
flash : ORIGIN = 0x0000000, LENGTH = 0x100000
dpram : ORIGIN = 0x0FFFE000, LENGTH = 0x1000
}
SECTIONS {
.text : {*(boot) *(text) *(eh_frame)} > flash
.data : {} > dpram
.bss : {} > dpram
eh_frame :{} > flash
/DISCARD/ : { *(eh_*)}
}
but it seems that on cygwin the /DISCARD/ special command doesn't work so my
binary files is larger than the mac generated one.
Any idea ?
--
f dot frumento at ngi dot it changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |f dot frumento at ngi dot it
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40521
