[yocto] Is this a bug of binutils

Fri Sep 20 01:43:31 PDT 2013

Hi,

On Fri, Sep 20, 2013 at 02:45:24PM +0800, Li Zhijian wrote:
> Hi，all
> 
> I got a big problem when using the cross-toolchain to compile a simple C program.
> This problem since 3ae71c74c71f13a390b21b4c3ead04e51aaa82b8
> which is to upgrade the binutils from 2.22 to 2.23.1
> 
> what I do is as follows, any help or ideas ?
> 
> I) Build my cross-toolchain
> # git clone http://git.yoctoproject.org/git/poky/.git
> # cd poky
> # git checkout 3ae71c74c71f13a390b21b4c3ead04e51aaa82b8 -b tcmode-default
> ...skip some steps...
> # bitbake meta-toolchain
> Loading cache: 100% |############################################################################################| ETA: 00:00:00
> Loaded 1122 entries from dependency cache.
> 
> Build Configuration:
> BB_VERSION = "1.17.0"
> BUILD_SYS = "x86_64-linux"
> NATIVELSBSTRING = "CentOS-6.3"
> TARGET_SYS = "x86_64-poky-linux"
> MACHINE = "qemux86-64"
> DISTRO = "poky"
> DISTRO_VERSION = "1.3+snapshot-20130912"
> TUNE_FEATURES = "m64"
> TARGET_FPU = ""
> meta
> meta-yocto
> meta-yocto-bsp = "tcmode-default:3ae71c74c71f13a390b21b4c3ead04e51aaa82b8"
> 
> ..cost a long time..
> all of the build work successfully
> 
> II) Install my cross-toolchain
> # ./poky-eglibc-x86_64-x86_64-toolchain-1.3+snapshot-20130912.sh
> Enter target directory for SDK (default: /opt/poky/1.3+snapshot): toolchain-1.3-tcmode-default
> 
> III） compile a simple C program
> # cat test.c
> int main ()
> {
> printf("hello world\n");
> return 0;
> }
> # source toolchain-1.3-tcmode-default/environment-setup-x86_64-poky-linux
> # $CC -o test test.c -L tmp/sysroots/qemux86-64/usr/lib/ -lm
Technically, for this simple program, it's enough to do:

$CC -o test test.c

The $CC contains the sysroot option and the linker will automatically
prefix /lib and /usr/lib with the target sysroot. So, it should be able
to compile just fine.

The -L option just adds another search path for libraries which will be
searched before the default ones. So, it shouldn't be a problem.

Somehow, it looks like it tries to link against the host's libraries.

Before compiling, do a 'echo $CC' and make sure the --sysroot points to
the correct directory.

Laurentiu

> test.c: In function 'main':
> test.c:3:9: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]
> /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux/../../libexec/x86_64-poky-linux/gcc/x86_64-poky-linux/4.7.2/ld: skipping incompatible /lib/libc.so.6 when searching for /lib/libc.so.6
> /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux/../../libexec/x86_64-poky-linux/gcc/x86_64-poky-linux/4.7.2/ld: cannot find /lib/libc.so.6
> /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux/../../libexec/x86_64-poky-linux/gcc/x86_64-poky-linux/4.7.2/ld: skipping incompatible /usr/lib/libc_nonshared.a when searching for /usr/lib/libc_nonshared.a
> /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux/../../libexec/x86_64-poky-linux/gcc/x86_64-poky-linux/4.7.2/ld: cannot find /usr/lib/libc_nonshared.a
> collect2: error: ld returned 1 exit status
> 
> 
> #cat toolchain-1.3-tcmode-default/environment-setup-x86_64-poky-linux
> export PATH=/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-pokysdk-linux/usr/bin:/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux:$PATH
> export PKG_CONFIG_SYSROOT_DIR=/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux
> export PKG_CONFIG_PATH=/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/usr/lib/pkgconfig
> export CONFIG_SITE=/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/site-config-x86_64-poky-linux
> export CC="x86_64-poky-linux-gcc -m64 --sysroot=/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux"
> export CXX="x86_64-poky-linux-g++ -m64 --sysroot=/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux"
> export CPP="x86_64-poky-linux-gcc -E -m64 --sysroot=/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux"
> export AS="x86_64-poky-linux-as "
> export LD="x86_64-poky-linux-ld --sysroot=/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux"
> export GDB=x86_64-poky-linux-gdb
> export STRIP=x86_64-poky-linux-strip
> export RANLIB=x86_64-poky-linux-ranlib
> export OBJCOPY=x86_64-poky-linux-objcopy
> export OBJDUMP=x86_64-poky-linux-objdump
> export AR=x86_64-poky-linux-ar
> export NM=x86_64-poky-linux-nm
> export M4=m4
> export TARGET_PREFIX=x86_64-poky-linux-
> export CONFIGURE_FLAGS="--target=x86_64-poky-linux --host=x86_64-poky-linux --build=x86_64-linux --with-libtool-sysroot=/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux"
> export CFLAGS=" -O2 -pipe -g -feliminate-unused-debug-types"
> export CXXFLAGS=" -O2 -pipe -g -feliminate-unused-debug-types -fpermissive"
> export LDFLAGS="-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed"
> export CPPFLAGS=""
> export OECORE_NATIVE_SYSROOT="/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-pokysdk-linux"
> export OECORE_TARGET_SYSROOT="/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux"
> export OECORE_ACLOCAL_OPTS="-I /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-pokysdk-linux/usr/share/aclocal"
> export OECORE_DISTRO_VERSION="1.3+snapshot-20130912"
> export OECORE_SDK_VERSION="1.3+snapshot"
> 
> -- 
> Best regards.
> Li Zhijian (8555)
> 
> 
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