Strange linker flags transformation

[Oleg Smolsky]

Hello, I'm experimenting with a different compiler setup and, hitting an 
issue with Libtool while tweaking linker flags. Here is what I am trying 
to invoke:

/bin/bash ./libtool  --tag=CC   --mode=link /opt/gcc-10sr/bin/gcc  -g 
-Wall -O2 -ljsoncpp -lmodpbase64 -lczmq -lzmq -lcrypto -lsqlite3 
-Wl,--dynamic-linker,/opt/sysroot/lib64/ld-linux-x86-64.so.2 
-Wl,-rpath,/opt/sysroot/lib64 -Wl,-rpath,/opt/gcc-10sr/lib64,/opt/3p/lib 
-L/opt/gcc-10sr/lib64 -L/opt/3p/lib -o xxx_test 
test/xxx_test/src/xxx_test.o libtask.la libutest.la -lpthread -lrt

And here is what is actually invoked:

libtool: link: /opt/gcc-10sr/bin/gcc -g -Wall -O2 -Wl,--dynamic-linker 
-Wl,/opt/sysroot/lib64/ld-linux-x86-64.so.2 -Wl,-rpath 
-Wl,/opt/sysroot/lib64 -Wl,-rpath -Wl,/opt/gcc-10sr/lib64 
-Wl,/opt/3p/lib -o xxx_test test/xxx_test/src/xxx_test.o -ljsoncpp 
/opt/3p/lib/libczmq.so /opt/3p/lib/libzmq.so -lcrypto 
/opt/3p/lib/libsqlite3.so -L/opt/gcc-10sr/lib64 -L/opt/3p/lib 
./.libs/libtask.a /opt/3p/lib/libmodpbase64.so 
/opt/gcc-10sr/lib/../lib64/libstdc++.so ./.libs/libutest.a -lpthread 
-lrt -Wl,-rpath -Wl,/opt/3p/lib -Wl,-rpath 
-Wl,/opt/gcc-10sr/lib/../lib64 -Wl,-rpath -Wl,/opt/3p/lib -Wl,-rpath 
-Wl,/opt/gcc-10sr/lib/../lib64

I am trying to understand where the trailer of that command is coming 
from (the stuff after -lrt). These linker flags are malformed. This 
specific example results in the following message:

..../bin/ld: fatal error: /opt/3p/lib: pread failed: Is a directory

I am trying to understand how this transformation is made... but 
struggling. I get different errors depending on how the -Wl,xxxxxx bits 
are cut...

I would appreciate any pointers. Thanks!

Oleg.