Hi Jie, Thanks for your response. I have downloaded cross toolchain from codesourcercy site.(Download Sourcery G++ Lite 2009q3-67 ) http://www.codesourcery.com/sgpp/lite/arm/portal/subscription3057 arm-2009q3/bin/arm-none-linux-gnueabi-gcc -v Using built-in specs. Target: arm-none-linux-gnueabi Configured with: /scratch/julian/2009q3-respin-linux-lite/src/gcc-4.4/configure --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --target=arm-none-linux-gnueabi --enable-threads --disable-libmudflap --disable-libssp --disable-libstdcxx-pch --enable-extra-sgxxlite-multilibs --with-arch=armv5te --with-gnu-as --with-gnu-ld --with-specs='%{funwind-tables|fno-unwind-tables|mabi=*|ffreestanding|nostdlib:;:-funwind-tables} %{O2:%{!fno-remove-local-statics: -fremove-local-statics}} %{O*:%{O|O0|O1|O2|Os:;:%{!fno-remove-local-statics: -fremove-local-statics}}}' --enable-languages=c,c++ --enable-shared --disable-lto --enable-symvers=gnu --enable-__cxa_atexit --with-pkgversion='Sourcery G++ Lite 2009q3-67' --with-bugurl=https://support.codesourcery.com/GNUToolchain/ --disable-nls --prefix=/opt/codesourcery --with-sysroot=/opt/codesourcery/arm-none-linux-gnueabi/libc --with-build-sysroot=/scratch/julian/2009q3-respin-linux-lite/install/arm-none-linux-gnueabi/libc --with-gmp=/scratch/julian/2009q3-respin-linux-lite/obj/host-libs-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu/usr --with-mpfr=/scratch/julian/2009q3-respin-linux-lite/obj/host-libs-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu/usr --with-ppl=/scratch/julian/2009q3-respin-linux-lite/obj/host-libs-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu/usr --with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm' --with-cloog=/scratch/julian/2009q3-respin-linux-lite/obj/host-libs-2009q3-67-arm-none-linux-gnueabi-i686-pc-linux-gnu/usr --disable-libgomp --enable-poison-system-directories --with-build-time-tools=/scratch/julian/2009q3-respin-linux-lite/install/arm-none-linux-gnueabi/bin --with-build-time-tools=/scratch/julian/2009q3-respin-linux-lite/install/arm-none-linux-gnueabi/bin Thread model: posix gcc version 4.4.1 (Sourcery G++ Lite 2009q3-67) I have Build 2.6.30 kernel for ARM and i am attaching my System.map file for your reference. also i am able to reproduce attached result when i build my attach program using below options. arm-linux-gnueabi-gcc -fno-optimize-sibling-calls -O2 test.c I can see Function name Convert to 0000842c t T.12 But If i give O0 Flag when Building then 0000834c t $d 00008470 t ABC 000084a8 t BCD I want to Build my kernel with O2 flag. Will you please provide some flag except 'O0' which disable this optimization. I have not check o/p of binary with gdb. Is GDB will have any issue with this type of optimization ? On Fri, Mar 26, 2010 at 12:18 PM, Jie Zhang <jie@xxxxxxxxxxxxxxxx> wrote: > On 03/26/2010 01:13 AM, Ian Lance Taylor wrote: >> trisha yad<trisha1march@xxxxxxxxx> writes: >> >>> I am attaching one sample program. >>> >>> 1. arm-linux-gnueabi-gcc -fno-optimize-sibling-calls -O0 test.c >>> 2. arm-linux-gnueabi-gcc -fno-optimize-sibling-calls -O2 test.c >>> arm-linux-gnueabi-nm of O0 is log1 >>> arm-linux-gnueabi-nm of O2 is log >>> >>> >>> I am attaching o/p of command using option --save-temps i.e in file >>> test.s >>> arm-linux-gnueabi-gcc -fno-optimize-sibling-calls --save-temps -O2 test.c >> >> I don't understand how the .c file you showed can produce the .s file >> that you showed. In the .c file, main calls ABC. In the .s file, it >> does not. I don't see how the optimizer could remove that call. >> > I cannot reproduce this issue from the attached source file either. > >> I do see the T.12 symbol in the assembler source. However, I don't >> know where it came from. I don't see when I compile your C file with >> a recent ARM gcc. >> > It might come from compiler instantiating a function, i.e. T.12 is a clone > of a function but with some parameters instantiated. Just my guess. > >> Can you explain why the T.12 symbol is a problem? >> > I think it should not be a problem. T.12 is a local symbol, it can be > stripped by strip with appropriate options. > > > -- > Jie Zhang > CodeSourcery > (650) 331-3385 x735 > >
Attachment:
System.map.tgz
Description: GNU Zip compressed data
