[OE-core] dylan: meta-toolchain and u-boot : "cannot find -lgcc"

[Mark Hatle]

On 4/26/13 2:26 AM, Eric Bénard wrote:
> Hi,
>
> here is a problem I met while trying to build u-boot with a toolchain
> generated using dylan.
>
> steps to reproduce :
> - bitbake meta-toolchain for an armv5t target
>
> - install the sdk to a custom path ($HOME/oecore-x86_64/ for example
>    instead of /usr/local/oecore-x86_64/
>
> - get u-boot :
> git clone git://git.denx.de/u-boot.git
> source ~/oecore-x86_64/environment-setup-armv5te-oe-linux-gnueabi
> make LDFLAGS="" ARCH=arm CROSS_COMPILE=arm-oe-linux-gnueabi-
>    da850evm_config
> make LDFLAGS="" ARCH=arm CROSS_COMPILE=arm-oe-linux-gnueabi-
>
> you will get :
> arm-oe-linux-gnueabi-gcc -E -g  -Os   -fno-common -ffixed-r8 -msoft-float  -D__KERNEL__ -ffunction-sections -fdata-sections -DCONFIG_SYS_TEXT_BASE=0xc1080000 -DCONFIG_SPL_TEXT_BASE=0x80000000 -DCONFIG_SPL_PAD_TO=0 -DCONFIG_SPL_BUILD -I/data/testdylan/tmp/u-boot/include -fno-builtin -ffreestanding -nostdinc -isystem /data/testdylan/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/bin/armv5te-oe-linux-gnueabi/../../lib/armv5te-oe-linux-gnueabi/gcc/arm-oe-linux-gnueabi/4.7.2/include -pipe  -DCONFIG_ARM -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -march=armv5te -include /data/testdylan/tmp/u-boot/include/u-boot/u-boot.lds.h -include /data/testdylan/tmp/u-boot/include/config.h -DCPUDIR=arch/arm/cpu/arm926ejs  -I/data/testdylan/tmp/u-boot/spl/. -ansi -D__ASSEMBLY__ -P - < /data/testdylan/tmp/u-boot/board/davinci/da8xxevm/u-boot-spl-da850evm.lds > /data/testdylan/tmp/u-boot/spl/u-boot-spl.lds
> cd /data/testdylan/tmp/u-boot/spl/ && arm-oe-linux-gnueabi-ld.bfd  -T /data/testdylan/tmp/u-boot/spl/u-boot-spl.lds --gc-sections -Bstatic -Ttext 0x80000000 arch/arm/cpu/arm926ejs/start.o --start-group arch/arm/cpu/arm926ejs/davinci/libdavinci.o arch/arm/cpu/arm926ejs/libarm926ejs.o arch/arm/lib/libarm.o board/davinci/da8xxevm/libda8xxevm.o common/libcommon.o common/spl/libspl.o drivers/mtd/spi/libspi_flash.o drivers/serial/libserial.o drivers/spi/libspi.o lib/libgeneric.o --end-group /data/testdylan/tmp/u-boot/spl/arch/arm/lib/eabi_compat.o -L . -lgcc -Map u-boot-spl.map -o u-boot-spl
> arm-oe-linux-gnueabi-ld.bfd: cannot find -lgcc
>
> this can be fixed by installing the sdk to it's standard path
> (/usr/local/oecore-x86_64/ in the present case).
>
> Is that an expected behaviour (as the sdk is primarly designed to build
> applications) or can that be fixed during the sdk relocation ?

When you use the SDK, you need to be sure to source the SDK environment setup. 
Once you do that, pass to the compiler/linker the included CFLAGS and LDFLAGS as 
specified in that environment file.

They should end up passing at some point a --sysroot=... and that will tell gcc 
where the libraries and headers are for linking.  Without the --sysroot= option, 
the compiler has no choice but to look for it's original compilation directory.

--Mark

> Thanks,
> Eric
>
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