problems loading shared libraries - with attached test case

[Christopher Blizzard <blizzard at mozilla dot org>]

Hi, I'm having problems loading shared libraries.  This is with a build
of gdb out of cvs that I pulled and built on March 27th and has been
there for at least a week.  I haven't gone back further than that.  This
is with the gcc that is shipping with Red Hat 6.2:

Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/specs
gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)

I'm using "set auto-solib-add 0" after main has been called.  If I use
"shar" to load a shared library manually once I can't use it again to
load another shared library later.  Please see the attached log for an
example of how to reproduce the problem.

--Chris

GNU gdb 20000204
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This GDB was configured as "i686-pc-linux-gnu"...
(gdb) break main
Breakpoint 1 at 0x8048576: file main.c, line 5.
(gdb) r
Starting program: /home/blizzard/src/gdb_test/main 

Breakpoint 1, main (argc=1, argv=0xbffff9c4) at main.c:5
5         void *handle0 = dlopen("./libdummy0.so", RTLD_LAZY);
(gdb) set auto-solib-add 0
(gdb) n
6         void *handle1 = dlopen("./libdummy1.so", RTLD_LAZY);
(gdb) n
7         void *handle2 = dlopen("./libdummy2.so", RTLD_LAZY);
(gdb) n
8         void *handle3 = dlopen("./libdummy3.so", RTLD_LAZY);
(gdb) n
9         printf("Hi.\n");
(gdb) shar dummy0
Reading symbols from /home/blizzard/src/gdb_test/./libdummy0.so...done.
Loaded symbols for /home/blizzard/src/gdb_test/./libdummy0.so
(gdb) shar dummy1
(gdb) info shar
From        To          Syms Read   Shared Object Library
0x4001a000  0x4001d08c  Yes         /lib/libdl.so.2
0x4001e000  0x4005ff90  Yes         /usr/lib/libstdc++-libc6.1-1.so.2
0x40060000  0x4007c9d8  Yes         /lib/libm.so.6
0x4007d000  0x4017185c  Yes         /lib/libc.so.6
0x40000000  0x40013ed0  Yes         /lib/ld-linux.so.2
0x40015000  0x40016cdc  Yes        
/home/blizzard/src/gdb_test/./libdummy0.so
0x40017000  0x40018cdc  No         
/home/blizzard/src/gdb_test/./libdummy1.so
0x40173000  0x40174cdc  No         
/home/blizzard/src/gdb_test/./libdummy2.so
0x40175000  0x40176cdc  No         
/home/blizzard/src/gdb_test/./libdummy3.so
(gdb) shar dummy3
(gdb) shar /home/blizzard/src/gdb_test/./libdummy2.so
(gdb) info shar
From        To          Syms Read   Shared Object Library
0x4001a000  0x4001d08c  Yes         /lib/libdl.so.2
0x4001e000  0x4005ff90  Yes         /usr/lib/libstdc++-libc6.1-1.so.2
0x40060000  0x4007c9d8  Yes         /lib/libm.so.6
0x4007d000  0x4017185c  Yes         /lib/libc.so.6
0x40000000  0x40013ed0  Yes         /lib/ld-linux.so.2
0x40015000  0x40016cdc  Yes        
/home/blizzard/src/gdb_test/./libdummy0.so
0x40017000  0x40018cdc  No         
/home/blizzard/src/gdb_test/./libdummy1.so
0x40173000  0x40174cdc  No         
/home/blizzard/src/gdb_test/./libdummy2.so
0x40175000  0x40176cdc  No         
/home/blizzard/src/gdb_test/./libdummy3.so
(gdb) 


-- 
------------
Christopher Blizzard
http://people.redhat.com/blizzard/
I bet a funny thing about driving a car off a cliff is, while
you're in midair, you still hit those brakes! Hey, better try
the emergency brake!
------------
CFLAGS = -g

SHLIBS = libdummy0.so libdummy1.so libdummy2.so libdummy3.so
TARGET = main

all: $(SHLIBS) $(TARGET)

main: main.c
	g++ $(CFLAGS) -o main main.c -ldl

libdummy0.cpp: gen_files.pl
	./gen_files.pl dummy0 > libdummy0.cpp

libdummy0.so: libdummy0.cpp
	g++ $(CFLAGS) -o libdummy0.so -shared -fPIC libdummy0.cpp

libdummy1.cpp: gen_files.pl
	./gen_files.pl dummy1 > libdummy1.cpp

libdummy1.so: libdummy1.cpp
	g++ $(CFLAGS) -o libdummy1.so -shared -fPIC libdummy1.cpp

libdummy2.cpp: gen_files.pl
	./gen_files.pl dummy2 > libdummy2.cpp

libdummy2.so: libdummy2.cpp
	g++ $(CFLAGS) -o libdummy2.so -shared -fPIC libdummy2.cpp

libdummy3.cpp: gen_files.pl
	./gen_files.pl dummy3 > libdummy3.cpp

libdummy3.so: libdummy3.cpp
	g++ $(CFLAGS) -o libdummy3.so -shared -fPIC libdummy3.cpp

clean:
	rm -f libdummy*.cpp *.so *.o *~ main

gen_files.pl

#include <dlfcn.h>
#include <stdio.h>

int main ( int argc, char **argv) {
  void *handle0 = dlopen("./libdummy0.so", RTLD_LAZY);
  void *handle1 = dlopen("./libdummy1.so", RTLD_LAZY);
  void *handle2 = dlopen("./libdummy2.so", RTLD_LAZY);
  void *handle3 = dlopen("./libdummy3.so", RTLD_LAZY);
  printf("Hi.\n");
}