Q:

gdb "During startup program exited with code 126."

I am debugging a c++ program:
gdb simplesearch.o

Then gdb startups successfully:
(gdb) Reading symbols from /home/zwx/workspace/xapian/examples/simplesearch.o...done.

But when I tried to run:
(gdb) run

gdb reports:
Starting program: /home/zwx/workspace/xapian/examples/simplesearch.o 
/bin/bash: /home/zwx/workspace/xapian/examples/simplesearch.o: cannot execute binary file
/bin/bash: /home/zwx/workspace/xapian/examples/simplesearch.o: Success
During startup program exited with code 126.

Someone has idea?

A:

A .o file is not a program, it is an object file that needs to be linked with libraries to produce a program.  You can use gdb to inspect code within it, but it is not runnable (the "cannot execute binary file" message).  You will need to link it to make a program.  Possibly something like
g++ -o simplesearch simplesearch.o

will suffice, but without more information it's not clear if it needs more libraries than just the system C libraries and C++ runtime support, etc.

