Re: SDK Issues

[Richard Purdie <richard.purdie@linuxfoundation.org>]

On Mon, 2014-02-17 at 10:44 +0000, Jack Mitchell wrote:
> I recently did a new build of my images and SDKs under master
> (b188bda18690dc1af) refreshing a 3 month old build. Now everything
> builds fine, but when trying to build our in house software with the
> SDK, the new SDK falls over citing issues failing to link with libdl. If
> I think switch back to using the old SDK, everything builds without
> issue. Can anybody think of anything which might have altered the SDK in
> the past few months in order to cause this to break? I have done a quick
> directory diff of the 2 SDKs and nothing radically different. GCC 4.81
> -> 4.82 and autotools 1.13  -> 1.14 are probably the big changes. From
> what I can see the command to build the application is linking with all
> the correct libraries and as it builds with previous versions I would be
> surprised if this was wrong. It also seems to be struggling with the
> -lcrypto libraries, but it hits the libdl issue first so it may just be
> a domino effect, or there could be a significant issue with the SDK
> generation.
> 
> i586-oe-linux-gcc -m32 -march=core2 -mtune=core2 -msse3 -mfpmath=sse
> --sysroot=/scratch/jmitchell/oecore-sdk/1/sysroots/core2-32-oe-linux -I.
> -I/scratch/jmitchell/code.git/net-snmp/../include -Wall -pipe  -rdynamic
> -g -Wall -Wextra -Wl,--build-id -O2 -Wall -Wstrict-prototypes
> -Wwrite-strings -Wcast-qual -Wno-char-subscripts -Dlinux -o .libs/snmpd
> snmpd.o -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -rdynamic -rdynamic
>  ./.libs/libucdagent.so ./.libs/libucdmibs.so -lwrap
> ../snmplib/.libs/libsnmp.so -lcrypto -ldl -lelf -ldl  -Wl,--rpath
> -Wl,/scratch/jmitchell/code.git/net-snmp/../net-snmp/usr/lib
> ./.libs/libucdmibs.so: undefined reference to `dlopen'
> ../snmplib/.libs/libsnmp.so: undefined reference to `EVP_md5'
> ../snmplib/.libs/libsnmp.so: undefined reference to `EVP_sha1'
> ../snmplib/.libs/libsnmp.so: undefined reference to `RAND_bytes'
> ../snmplib/.libs/libsnmp.so: undefined reference to `EVP_DigestInit'
> ./.libs/libucdmibs.so: undefined reference to `dlclose'
> ../snmplib/.libs/libsnmp.so: undefined reference to `DES_ncbc_encrypt'
> ../snmplib/.libs/libsnmp.so: undefined reference to `DES_cbc_encrypt'
> ../snmplib/.libs/libsnmp.so: undefined reference to `EVP_DigestUpdate'
> ../snmplib/.libs/libsnmp.so: undefined reference to `HMAC'
> ../snmplib/.libs/libsnmp.so: undefined reference to `DES_key_sched'
> ./.libs/libucdmibs.so: undefined reference to `dlerror'
> ./.libs/libucdmibs.so: undefined reference to `dlsym'
> ../snmplib/.libs/libsnmp.so: undefined reference to `EVP_DigestFinal'
> 
> Any light shed would be much appreciated!

Binutils changed and we did see some occasional link issues with that.
You could try the command without -Wl,--as-needed. If that helps, you
have a library ordering issue which the new stricter binutils picked up.

I'm just guessing mind but its worth a try...

Cheers,

Richard