llvm dev - Jun 2011 - [LLVMdev] How to get an LLVM-compiled executable which could be debugged using gdb

Hi,

I need a simple demonstration of compiling a program into a executable which
could be debugged using gdb.
After looking up the llc.cpp, llvm-ld.cpp, I found that llvm only generated
the assemble code, and left the other work to gnu as and gnu ld.
Since the information from LLVM into gnu as and gnu ld is limited by the
assemble file, I am confusing with how to transfer the debug information to
gnu as and gnu ld.
Could any one help me?

-- 
Best regards,

Li Qingan
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Hi,

On Tue, Jun 14, 2011 at 10:55 AM, Qingan Li  wrote:
> Hi,
...
> Since the information from LLVM into gnu as and gnu ld is limited by the
> assemble file, I am confusing with how to transfer the debug information to
> gnu as and gnu ld.
> Could any one help me?
Debug information can be placed in the assembler source. This is what
GCC does; you can see for yourself if you run
gcc -g -save-temps filename.c

Csaba
-- 
GCS a+ e++ d- C++ ULS$ L+$ !E- W++ P+++$ w++$ tv+ b++ DI D++ 5++
The Tao of math: The numbers you can count are not the real numbers.
Life is complex, with real and imaginary parts.
"Ok, it boots. Which means it must be bug-free and perfect. " -- Linus
Torvalds
"People disagree with me. I just ignore them." -- Linus Torvalds

> Debug information can be placed in the assembler source. This is what
> GCC does; you can see for yourself if you run
> gcc -g -save-temps filename.c
  I guess he want to ask if llc can emit debugging information which GDB
can use.

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667

Hi Li Qingan,
> I need a simple demonstration of compiling a program into a executable
which
> could be debugged using gdb.
> After looking up the llc.cpp, llvm-ld.cpp, I found that llvm only generated
the
> assemble code, and left the other work to gnu as and gnu ld.
> Since the information from LLVM into gnu as and gnu ld is limited by the
> assemble file, I am confusing with how to transfer the debug information to
gnu
> as and gnu ld.
> Could any one help me?
I didn't really understand what you are asking.  If you are compiling using
clang, llvm-gcc or dragonegg then add the -g argument to the command line to
get debug info in the final program, exactly like when compiling with gcc.

Ciao, Duncan.