Debug and Library Questions

[lehe]

Hi,
I have two questions. Thanks in advance for pointing out what you think about them!

1. This is a question of GDB. How to step over instead of stepping into in the following code:

for(int i = 0; i < argc; i++)
cout << (i > 0 ? " " : "") << argv << (i < argc - 1 ? " \\" : "")
<< endl;

I try to use next to step over, but always step into some other source file as I get the information:

517 __ostream_insert(__out, __s,
(gdb)
444 { return __check_facet(_M_ctype).widen(__c); }
(gdb)
53 if (!__f)
(gdb)
873 if (_M_widen_ok)
(gdb)
1169 __tmp[__i] = __i;
(gdb)
1168 for (size_t __i = 0; __i < sizeof(_M_widen); ++__i)
(gdb)
1169 __tmp[__i] = __i;
(gdb)
1168 for (size_t __i = 0; __i < sizeof(_M_widen); ++__i)
(gdb)
1169 __tmp[__i] = __i;

If I try to step out, I get:

(gdb) finish
"finish" not meaningful in the outermost frame.

The Makefile is something like:

LDFLAGS=-static -lm -ljpeg -lpng -lz
OPTIMIZE_FLAG = -ggdb3 -DDEBUG
CXXFLAGS = -Wall $(OPTIMIZE_FLAG)
absurdity: xxx.o
$(CXX) $(CXXFLAGS) -o $@ $^ $(LDFLAGS)
Makefile.depend: *.h *.cc Makefile
$(CC) -M *.cc > Makefile.depend
include Makefile.depend

2. On the contrary, sometimes I'd like to get inside the implementation of some library, say libpng, but when I try to debug into it I can't. I download its source code, which contains all the .c files, from

http://prdownloads.sourceforge.net/libpng/libpng-1.2.34.tar.gz?download.

After ./configure, make and make install, the .h files gets into /usr/local/include/libpng12/, the library files get into /usr/local/lib/, but no .c files get into /usr/local/src/ or /usr/src. Is that why there is no source file to debug? How could I fix it?

Thanks a lot!