Re: [poky] Is this a bug of binutils

[Li Zhijian <lizhijian@cn.fujitsu.com>]

at 2013-9-20 19:00, Laurentiu Palcu wrote:
> Hi,
>
> On Fri, Sep 20, 2013 at 06:25:19PM +0800, Li Zhijian wrote:
>>>>>>> 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
> OK, it looks like something strange happens in your setup.
>
> To debug it, let's add '-Wl,--verbose' at the end of your command and you
> should be able to see where the linker is looking for libraries. Also,
> the linker script will be printed.
>
> You should see it try your directory first
> tmp/sysroots/qemux86-64/usr/lib/, and then fall through the default ones
> with the sysroot prefix added and, at the end, the system ones:
> /lib:/usr/lib.
>
> Thanks,
> Laurentiu

First，in this case

[lizj@suika x86-64-yocto-1.3]$ source toolchain-1.3-tcmode-default/environment-setup-x86_64-poky-linux
[lizj@suika x86-64-yocto-1.3]$ echo $CC
x86_64-poky-linux-gcc -m64 --sysroot=/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux
[lizj@suika x86-64-yocto-1.3]$ $CC -o test test.c -L tmp/sysroots/qemux86-64/usr/lib/ -lm -Wl,--verbose
test.c: In function 'main':
test.c:3:9: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]
GNU ld (GNU Binutils) 2.23.1.20121113
   Supported emulations:
    elf_x86_64
    elf32_x86_64
    elf_i386
    i386linux
    elf_l1om
    elf_k1om
using internal linker script:
==================================================
/* Script for -z combreloc: combine and sort reloc sections */
OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64",
               "elf64-x86-64")
OUTPUT_ARCH(i386:x86-64)
ENTRY(_start)
SEARCH_DIR("/opt/poky/1.3+snapshot/sysroots/x86_64-pokysdk-linux/usr/x86_64-poky-linux/lib64"); SEARCH_DIR("=/usr/local/lib64"); SEARCH_DIR("=/lib64"); SEARCH_DIR("=/usr/lib64"); SEARCH_DIR("=/usr/local/lib"); SEARCH_DIR("=/lib"); SEARCH_DIR("=/usr/lib");
SECTIONS
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==================================================
attempt to open /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/usr/lib/../lib/crt1.o succeeded
/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/usr/lib/../lib/crt1.o
attempt to open /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/usr/lib/../lib/crti.o succeeded
/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/usr/lib/../lib/crti.o
attempt to open /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/usr/lib/x86_64-poky-linux/4.7.2/crtbegin.o succeeded
/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/usr/lib/x86_64-poky-linux/4.7.2/crtbegin.o
attempt to open /tmp/ccyeJPMB.o succeeded
/tmp/ccyeJPMB.o
attempt to open tmp/sysroots/qemux86-64/usr/lib//libm.so succeeded
-lm (tmp/sysroots/qemux86-64/usr/lib//libm.so)
attempt to open tmp/sysroots/qemux86-64/usr/lib//libgcc.so failed
attempt to open tmp/sysroots/qemux86-64/usr/lib//libgcc.a failed
attempt to open /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/../../lib/x86_64-poky-linux/gcc/x86_64-poky-linux/4.7.2/libgcc.so failed
attempt to open /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/../../lib/x86_64-poky-linux/gcc/x86_64-poky-linux/4.7.2/libgcc.a failed
attempt to open /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/../../lib/x86_64-poky-linux/gcc/libgcc.so failed
attempt to open /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/../../lib/x86_64-poky-linux/gcc/libgcc.a failed
attempt to open /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/lib/../lib/libgcc.so failed
attempt to open /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/lib/../lib/libgcc.a failed
attempt to open /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/usr/lib/x86_64-poky-linux/4.7.2/libgcc.so failed
attempt to open /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/usr/lib/x86_64-poky-linux/4.7.2/libgcc.a succeeded
attempt to open tmp/sysroots/qemux86-64/usr/lib//libgcc_s.so failed
attempt to open tmp/sysroots/qemux86-64/usr/lib//libgcc_s.a failed
attempt to open /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/../../lib/x86_64-poky-linux/gcc/x86_64-poky-linux/4.7.2/libgcc_s.so failed
attempt to open /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/../../lib/x86_64-poky-linux/gcc/x86_64-poky-linux/4.7.2/libgcc_s.a failed
attempt to open /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/../../lib/x86_64-poky-linux/gcc/libgcc_s.so failed
attempt to open /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/../../lib/x86_64-poky-linux/gcc/libgcc_s.a failed
attempt to open /yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/lib/../lib/libgcc_s.so succeeded
-lgcc_s (/yocto/fnst/lizj/build_yocto/x86-64-yocto-1.3/toolchain-1.3-tcmode-default/sysroots/x86_64-poky-linux/lib/../lib/libgcc_s.so)
attempt to open tmp/sysroots/qemux86-64/usr/lib//libc.so succeeded
opened script file tmp/sysroots/qemux86-64/usr/lib//libc.so
opened script file tmp/sysroots/qemux86-64/usr/lib//libc.so
attempt to open /lib/libc.so.6 succeeded
attempt to open /usr/lib/libc_nonshared.a succeeded
attempt to open /lib/ld-linux-x86-64.so.2 succeeded
/lib/ld-linux-x86-64.so.2
/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

-- 
Best regards.
Li Zhijian