RPI4 libmdk.so: invalid string offset about mdk-sdk HOT 13 CLOSED

It was a problem with symlinks, apparently. I've removed libmdk.so.0 and recreated symlinks as follows:

libmdk.so -> libmdk.so.0
libmdk.so.0 -> libmdk.so.0.10.0.dsym

Please tell me if this is correct.

update:
renaming libmdk.so.0.10.0.dsym to libmdk.so.0
and linking libmdk.so -> libmdk.so.0
also works

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which sdk do you use? it should be mdk-sdk-linux for rpi4. and what's you os arch? armhf or arm64?

dsym is debug symbol file. usually you don't need it. I use lld as linker, maybe some linker flags are not compatible with gnu ld. Please wait a few days because now i have no device to test.

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Tried both, same thing happens. I can test for you anytime you leave a note.

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It seems only dsym is not throwing errors. I use G++ linker standard ld, tried versions from 6 to 8

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Armhf

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This is weird: on PI4 the above relinking method works, but only for raspberry-pi binaries, for linux libraries (armhf) I get this after ldconfig:
/usr/local/lib/libmdk.so.0: symbolic link to lib.mdk.so and a message that object file has no dynamic section.

from mdk-sdk.

I found that the same error appears when you press F3 on libmdk.so.0 in Midnight Commabder

from mdk-sdk.

Can you try lld? What about old mdk binaries?

/usr/local/lib/libmdk.so.0: symbolic link to lib.mdk.so and a message that object file has no dynamic section.
If it's a warning, you can ignore it.

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I find the same issue on stack overflow, but no answer. You can try the follow script on rpi to generate a stub so file for ld

build_stub_so(){
  cc -shared $1 -o $2 -Wl,-soname,$3
}

build_stub_so_1(){
  # --no-weak
  local so=$1
  local STUB_C=/tmp/${so##*\/}.c
  local STUB_SO=${so##*\/}
  local SYMS=/tmp/${so##*\/}.txt
  nm -gD --defined-only $so >$SYMS
  funcs=($(cat $SYMS |grep " T " |grep -vE 'T _fini|T _init' |awk '{print $3}' |uniq))
  funcs=(${funcs[@]/%/()\{\}})
  echo ${funcs[@]/#/void } >$STUB_C
  wfuncs=($(cat $SYMS |grep " W " |awk '{print $3}' |uniq))
  [[ ${#wfuncs} > 0 ]] && {
    wfuncs=(${wfuncs[@]/%/()\{\}})
    echo ${wfuncs[@]/#/void __attribute__((weak))} >>$STUB_C
  }
 
  #vars=($(cat $SYMS |grep " B " |grep -vE 'B _bss|B __bss_|B _end|B __end' |awk '{print $3}' |uniq))
  [[ ${#vars} > 0 ]] && {
    echo ${vars[@]/#/;int } >> $STUB_C
    echo ';' >> $STUB_C
  }
  soname=`objdump -x $so |grep SONAME  |awk '{print $2}'`
  build_stub_so $STUB_C $STUB_SO $soname
  rm $STUB_C
  rm $SYMS
}

build_stub_so_1 $1

Save it as build_stub.sh, and run ./build_stub.sh path_to_so_file, then the generated so can be used by linker when build your programs. The original libmdk.so.0 is used at runtime.

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Can you try lld? What about old mdk binaries?

/usr/local/lib/libmdk.so.0: symbolic link to lib.mdk.so and a message that object file has no dynamic section.
If it's a warning, you can ignore it.

Tried lld. The invalid offset flood is gone, but got this instead:

ld.lld: warning: lld uses extended branch encoding, no object with architecture supporting feature detected.
ld.lld: warning: lld may use movt/movw, no object with architecture supporting feature detected.

But it compiles as before.

Which version should I try next? I can see in old folder max 0.4.1 version

Edit: I'm gonna try your script in a moment.

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Confirmed on my rpi4. Don't know the reason yet. The warnings can be ignored.

The script works perfectly. Remove the old libmdk.so, run

rm mdk-sdk/lib/armhf/libmdk.so
./build_stub.sh mdk-sdk/lib/armhf/libmdk.so.0
mv libmdk.so.0 mdk-sdk/lib/armhf/libmdk.so

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ld.lld: warning: lld uses extended branch encoding, no object with architecture supporting feature detected.
ld.lld: warning: lld may use movt/movw, no object with architecture supporting feature detected.

lld-8 or later is fine. I guess it's an lld bug.

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Sorry for late reply. Your script works great with standard linker. The final so file is rather small though, but that's to be expected I believe.

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