gdb on AIX

[Petchesi Gabriel Horatiu <gabi at prolix dot ro>]

Hi!

I'm having the following problems with gdb on AIX 5.2, 32 bit, Power PC
architecture:

1. Debugging static variables with gdb 6.0 
This problem problem generated more grief than anything else. 
If in a program i have a static global variable I'm not able to monitor
the value. The tracing/monitoring of local variables works fine.
======================================================================
$ more main.c
#include <stdio.h>

static int32_t i = 0;

int main(int argc, char **argv)
{
  while (1)
  {
    printf("Value %d\n", i);
    sleep(2);
    i++;
  }
}

$ make
gcc -c -o main.o -ggdb3    main.c
gcc -o bb -ggdb3   main.o

$ gdb ./bb
GNU gdb 6.0
Copyright 2003 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "powerpc-ibm-aix5.1.0.0"...
(gdb) break main.c:11
Breakpoint 1 at 0x10000394: file main.c, line 11.
(gdb) run
Starting program: /home/gabi/test_appz/bluebird/bb
Value 0

Breakpoint 1, main (argc=1, argv=0x2ff228d4) at main.c:11
11          i++;
(gdb) print i
No symbol "i" in current context.
(gdb) display i
No symbol "i" in current context.
(gdb) next
9           printf("Value %d\n", i);
(gdb) next
Value 1
======================================================================
I noticed 2 different behaviors for these type of variables in 2
different programs:
a. The "No symbol in current context" message.
b. Wrong value printed out. The symbol is found but the value that is
printed out is not correct.
Is this a known issue or am I doing something wrong?

----------------------------------------------------------------------

2. Compilation of gdb 6.4 on AIX 5.2
I try to solve the problems noticed at #1 by trying out the latest
version of gdb (6.4) on AIX. I try to compile it with the following:

$ gcc -v
Reading specs
from /opt/freeware/lib/gcc-lib/powerpc-ibm-aix5.2.0.0/3.3.2/specs
Configured with: ../configure --with-as=/usr/bin/as
--with-ld=/usr/bin/ld --disable-nls --enable-languages=c,c++
--prefix=/opt/freeware --enable-threads
--enable-version-specific-runtime-libs --host=powerpc-ibm-aix5.2.0.0
Thread model: aix
gcc version 3.3.2

The compilation stops at the final stage of link-editing:
======================================================================================
config.status: creating Makefile
make[2]: Entering directory `/home/gabi/temp/gdb-6.4/sim'
make[3]: Entering directory `/home/gabi/temp/gdb-6.4/sim/ppc'
CONFIG_FILES= CONFIG_HEADERS=config.h:config.in /bin/sh ./config.status
config.status: creating config.h
config.status: config.h is unchanged
config.status: executing default commands
# The first for loop is to remove duplicates.
f=""; \
for i in hw_cpu.c hw_memory.c hw_nvram.c hw_iobus.c hw_htab.c hw_disk.c
hw_trace.c hw_register.c hw_vm.c hw_init.c hw_core.c hw_pal.c hw_com.c
hw_eeprom.c hw_opic.c hw_glue.c hw_phb.c hw_ide.c ; do \
  case " $f " in \
    *" $i "*) ;; \
    *) f="$f $i" ;; \
  esac ; \
done ; \
for hw in $f ; do echo $hw ; done \
| sed -e 's/^.*\(hw_.*\)\.c/\1/' \
        -e 's/^/extern const device_descriptor /' \
        -e 's/$/_device_descriptor\[\];/' \
        > tmp-hw.h
f=""; \
for i in hw_cpu.c hw_memory.c hw_nvram.c hw_iobus.c hw_htab.c hw_disk.c
hw_trace.c hw_register.c hw_vm.c hw_init.c hw_core.c hw_pal.c hw_com.c
hw_eeprom.c hw_opic.c hw_glue.c hw_phb.c hw_ide.c ; do \
  case " $f " in \
    *" $i "*) ;; \
    *) f="$f $i" ;; \
  esac ; \
done ; \
for hw in $f ; do echo $hw ; done \
| sed -e 's/^.*\(hw_.*\)\.c/\1/' \
        -e 's/^/    /' \
        -e 's/$/_device_descriptor,/' \
        > tmp-hw.c
/bin/sh ../.././sim/ppc/../../move-if-change tmp-hw.h hw.h
/bin/sh ../.././sim/ppc/../../move-if-change tmp-hw.c hw.c
touch tmp-hw
# The first for loop is to remove duplicates.
f=""; \
for i in pk_disklabel.c ; do \
  case " $f " in \
    *" $i "*) ;; \
    *) f="$f $i" ;; \
  esac ; \
done ; \
for pk in $f ; do echo $pk ; done \
| sed -e 's/^.*pk_\(.*\)\.c/\1/' \
        -e 's/^/extern package_create_instance_callback pk_/' \
        -e 's/$/_create_instance;/' \
        > tmp-pk.h
/bin/sh ../.././sim/ppc/../../move-if-change tmp-pk.h pk.h
touch tmp-pk
sed -n -e '/^#define HAVE_/s/ 1$/",/' -e '/^#define HAVE_/s//"HAVE_/p' <
config.h > tmp-defines.h
/bin/sh ../.././sim/ppc/../../move-if-change tmp-defines.h defines.h
touch tmp-defines
gcc  -I. -I../common -I../.././sim/ppc/../common -o
gentmap ../common/gentmap.c
rm -f tmp-vals.h
./gentmap -h > tmp-vals.h
/bin/sh ../.././sim/ppc/../../move-if-change tmp-vals.h targ-vals.h
rm -f tmp-map.c
./gentmap -c > tmp-map.c
/bin/sh ../.././sim/ppc/../../move-if-change tmp-map.c targ-map.c
gcc -c -g -O2  -DDEFAULT_INLINE=PSIM_INLINE_LOCALS
-DWITH_HOST_BYTE_ORDER=BIG_ENDIAN -DWITH_SMP=5
-DHAVE_TERMIO_STRUCTURE -DHAVE_TERMIO_CLINE -DHAVE_DEVZERO     -I.
-I../.././sim/ppc -I../.././sim/ppc/../../include -I../../bfd
-I../.././sim/ppc/../../bfd -I../../gdb -I../.././sim/ppc/../../gdb
-I../.././sim/ppc/../../gdb/config -I../../intl
-I../.././sim/ppc/../../intl -DHAVE_COMMON_FPU -I../common
-I../.././sim/ppc/../common '-DOPCODE_RULES="dc-complex"'
'-DIGEN_FLAGS=" -E  -F 32,f,o -CSRI 1024 -N 5 "' '-DDGEN_FLAGS=""'
options.c
rm -f libsim.a
ar rc libsim.a debug.o filter_filename.o bits.o sim-endian.o os_emul.o
emul_generic.o emul_bugapi.o emul_chirp.o emul_netbsd.o emul_unix.o
registers.o vm.o corefile.o model.o spreg.o cpu.o interrupts.o events.o
cap.o device.o tree.o device_table.o itable.o mon.o icache.o semantics.o
idecode.o support.o sim-fpu.o psim.o pk_disklabel.o hw_cpu.o hw_memory.o
hw_nvram.o hw_iobus.o hw_htab.o hw_disk.o hw_trace.o hw_register.o
hw_vm.o hw_init.o hw_core.o hw_pal.o hw_com.o hw_eeprom.o hw_opic.o
hw_glue.o hw_phb.o hw_ide.o options.o gdb-sim.o sim_calls.o callback.o
targ-map.o
ranlib libsim.a
gcc -g -O2    -o psim main.o
libsim.a ../../bfd/libbfd.a  ../../libiberty/libiberty.a
rm -f run
ln psim run
make[3]: Leaving directory `/home/gabi/temp/gdb-6.4/sim/ppc'
make[3]: Entering directory `/home/gabi/temp/gdb-6.4/sim/common'
make[3]: Nothing to be done for `default'.
make[3]: Leaving directory `/home/gabi/temp/gdb-6.4/sim/common'
make[2]: Leaving directory `/home/gabi/temp/gdb-6.4/sim'
make[2]: Entering directory `/home/gabi/temp/gdb-6.4/gdb'
CONFIG_HEADERS=config.h:config.in /bin/sh config.status
config.status: creating Makefile
config.status: creating .gdbinit
config.status: creating config.h
config.status: config.h is unchanged
config.status: linking .././gdb/config/rs6000/tm-rs6000.h to tm.h
config.status: linking .././gdb/config/powerpc/nm-aix.h to nm.h
config.status: executing default commands
rm -f version.c-tmp version.c
echo '#include "version.h"' >> version.c-tmp
echo 'const char version[] = "'"`sed q .././gdb/version.in`"'";' >>
version.c-tmp
echo 'const char host_name[] = "powerpc-ibm-aix5.2.0.0";' >>
version.c-tmp
echo 'const char target_name[] = "powerpc-ibm-aix5.2.0.0";' >>
version.c-tmp
mv version.c-tmp version.c
gcc -c -g -O2     -I. -I.././gdb -I.././gdb/config
-DLOCALEDIR="\"/opt/gdb_6.4/share/locale\"" -DHAVE_CONFIG_H
-I.././gdb/../include/opcode -I.././gdb/../readline/.. -I../bfd
-I.././gdb/../bfd -I.././gdb/../include -I../intl -I.././gdb/../intl
-DMI_OUT=1 -DTUI=1 -Wimplicit -Wreturn-type -Wcomment -Wtrigraphs
-Wformat -Wparentheses -Wpointer-arith -Wformat-nonliteral
-Wunused-label -Wunused-function -Wuninitialized  version.c
Making init.c
gcc -c -g -O2     -I. -I.././gdb -I.././gdb/config
-DLOCALEDIR="\"/opt/gdb_6.4/share/locale\"" -DHAVE_CONFIG_H
-I.././gdb/../include/opcode -I.././gdb/../readline/.. -I../bfd
-I.././gdb/../bfd -I.././gdb/../include -I../intl -I.././gdb/../intl
-DMI_OUT=1 -DTUI=1 -Wimplicit -Wreturn-type -Wcomment -Wtrigraphs
-Wformat -Wparentheses -Wpointer-arith -Wformat-nonliteral
-Wunused-label -Wunused-function -Wuninitialized  init.c
rm -f libgdb.a
ar q libgdb.a rs6000-tdep.o xcoffread.o ppc-sysv-tdep.o solib.o
solib-svr4.o ser-base.o ser-unix.o ser-pipe.o ser-tcp.o fork-child.o
infptrace.o inftarg.o corelow.o rs6000-nat.o xcoffread.o xcoffsolib.o
remote.o dcache.o remote-utils.o tracepoint.o ax-general.o ax-gdb.o
remote-fileio.o  cli-dump.o cli-decode.o cli-script.o cli-cmds.o
cli-setshow.o cli-utils.o cli-logging.o cli-interp.o mi-out.o
mi-console.o mi-cmds.o mi-cmd-env.o mi-cmd-var.o mi-cmd-break.o
mi-cmd-stack.o mi-cmd-file.o mi-cmd-disas.o mi-symbol-cmds.o mi-interp.o
mi-main.o mi-parse.o mi-getopt.o mi-common.o aix-thread.o tui-command.o
tui-data.o tui-disasm.o tui-file.o tui.o tui-hooks.o tui-interp.o
tui-io.o tui-layout.o tui-out.o tui-regs.o tui-source.o tui-stack.o
tui-win.o tui-windata.o tui-wingeneral.o tui-winsource.o c-exp.o
cp-name-parser.o objc-exp.o ada-exp.o jv-exp.o f-exp.o m2-exp.o p-exp.o
version.o annotate.o auxv.o bfd-target.o blockframe.o breakpoint.o
findvar.o regcache.o charset.o disasm.o dummy-frame.o source.o value.o
eval.o valops.o valarith.o valprint.o printcmd.o block.o symtab.o
symfile.o symmisc.o linespec.o dictionary.o infcall.o infcmd.o infrun.o
expprint.o environ.o stack.o thread.o exceptions.o inf-child.o interps.o
main.o macrotab.o macrocmd.o macroexp.o macroscope.o event-loop.o
event-top.o inf-loop.o completer.o gdbarch.o arch-utils.o gdbtypes.o
osabi.o copying.o memattr.o mem-break.o target.o parse.o language.o
buildsym.o std-regs.o signals.o kod.o kod-cisco.o gdb-events.o exec.o
bcache.o objfiles.o observer.o minsyms.o maint.o demangle.o dbxread.o
coffread.o coff-pe-read.o elfread.o dwarfread.o dwarf2read.o mipsread.o
stabsread.o corefile.o dwarf2expr.o dwarf2loc.o dwarf2-frame.o
ada-lang.o c-lang.o f-lang.o objc-lang.o ui-out.o cli-out.o varobj.o
wrapper.o jv-lang.o jv-valprint.o jv-typeprint.o m2-lang.o p-lang.o
p-typeprint.o p-valprint.o scm-exp.o scm-lang.o scm-valprint.o
sentinel-frame.o complaints.o typeprint.o ada-typeprint.o c-typeprint.o
f-typeprint.o m2-typeprint.o ada-valprint.o c-valprint.o cp-valprint.o
f-valprint.o m2-valprint.o nlmread.o serial.o mdebugread.o top.o utils.o
ui-file.o user-regs.o frame.o frame-unwind.o doublest.o frame-base.o
gnu-v2-abi.o gnu-v3-abi.o hpacc-abi.o cp-abi.o cp-support.o
cp-namespace.o reggroups.o regset.o trad-frame.o tramp-frame.o solib.o
solib-null.o inflow.o    init.o
ranlib libgdb.a
rm -f gdb
gcc -g -O2      -Wl,-bbigtoc -lpthdebug  \
        -o gdb gdb.o libgdb.a \
           ../readline/libreadline.a ../opcodes/libopcodes.a ../bfd/libbfd.a  ../libiberty/libiberty.a     -lcurses -liconv ../libiberty/libiberty.a
ld: 0711-317 ERROR: Undefined symbol: .pow
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more
information.
collect2: ld returned 8 exit status
make[2]: *** [gdb] Error 1
make[2]: Leaving directory `/home/gabi/temp/gdb-6.4/gdb'
make[1]: *** [all-gdb] Error 2
make[1]: Leaving directory `/home/gabi/temp/gdb-6.4'
make: *** [all] Error 2
======================================================================================
Is this a known issue any workarounds?
Does one of the releases 6.0 -> 6.4 solve the problem described at #1.

I tried also compiling 6.3 from sources but it stops at a previous step
(some dependency in gettext if i remember correctly).

	gabriel

-- 
Petchesi Gabriel Horatiu
E-mail: gabi@prolix.ro