[llvm-dev] Is it possible to remove ARM.exidx section?

[Jonathan Roelofs via llvm-dev]

On 2/10/16 9:48 AM, Pavel Kosov via llvm-dev wrote:
> Hello All,
>
>
> I've compiled static library (*.a) with Clang3.7 (-target arm-none-eabi)
> with -Oz (size very matter for me),
> on Ubuntu 14.04
> but code size still significant bigger, than produced by GCC 4.8.
>
> In Objdump we can see, that there are .ARM.exidx sections (size of these
> sections - 8 bytes),
> but GCC-produced code dont have these sections
>
> Also in readelf we can see, that .text section in almost all cases bigger,
> than same sections in GCC-produced code
>
> Flags are same (exclude -Os for GCC and -Oz for Clang)
> clang -target arm-none-eabi -Oz -ffunction-sections -fdata-sections -c
> -nostdinc -isystem ../LIB/include -std=c99 -funsigned-char -mabi=aapcs
> -mthumb -MD  -mcpu=cortex-a5 -mfloat-abi=softfp -mfpu=vfpv3-d16 sin.c -o
> "LIB/obj/sinl.o"
>
> /usr/bin/arm-none-eabi-gcc -Os -ffunction-sections -fdata-sections -c
> -nostdinc -isystem ../LIB/include -std=c99 -funsigned-char -mabi=aapcs
> -mthumb -MD  -mcpu=cortex-a5 -mfloat-abi=softfp -mfpu=vfpv3-d16 sin.c -o
> "LIB/obj/sinl.o"
>
> Could you please give me some tips, how to reduce size of produced library?
> If you need any additional information, please let me know.

-fno-exceptions -fno-unwind-tables -Os

>
>
>
> Best Regards
> Paul
>
>
>
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-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded