[Bug other/29049] possible problem: building gcc >= 4.2 on i686 GNU/Linux|SMP (non-64bit) platform fails

["hjl at lucon dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #28 from hjl at lucon dot org  2006-09-13 15:03 -------
Apparently, your target_flags sets MASK_64BIT. You need to run gdb on cc1 and
set hardware watchpoint on target_flags to see where it sets MASK_64BIT:

[hjl@gnu-3 gcc]$ touch x.i
[hjl@gnu-3 gcc]$ gdb cc1
GNU gdb 6.4.50.20060406-cvs
Copyright (C) 2006 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 "i686-pc-linux-gnu"...Using host libthread_db
library "/lib/tls/libthread_db.so.1".

Breakpoint 1 at 0x8138b96: file ../../gcc/diagnostic.c, line 602.
Breakpoint 2 at 0x8138b43: file ../../gcc/diagnostic.c, line 547.
Function "exit" not defined.
Function "abort" not defined.
(gdb) watch target_flags
Hardware watchpoint 3: target_flags
(gdb) r -fpreprocessed x.i -quiet -dumpbase x.i -mtune=pentiumpro -auxbase x
-version -o x.s
Starting program: /export/gnu/import/gcc-4.1.0/build/gcc/cc1 -fpreprocessed x.i
-quiet -dumpbase x.i -mtune=pentiumpro -auxbase x -version -o x.s
Hardware watchpoint 3: target_flags
Hardware watchpoint 3: target_flags
Hardware watchpoint 3: target_flags

Old value = 0
New value = 8388808
decode_options (argc=12, argv=0xbff24ef4) at ../../gcc/opts.c:634
634       flag_unwind_tables = targetm.unwind_tables_default;
(gdb) c
Continuing.
During symbol reading, incomplete CFI data; unspecified registers (e.g., eax)
at 0x828dfc3.
During symbol reading, incomplete CFI data; unspecified registers (e.g., ecx)
at 0x828dfc3.
During symbol reading, incomplete CFI data; unspecified registers (e.g., edx)
at 0x828dfc3.
During symbol reading, incomplete CFI data; unspecified registers (e.g., eax)
at 0x830f53c.
During symbol reading, incomplete CFI data; unspecified registers (e.g., ecx)
at 0x830f53c.
During symbol reading, incomplete CFI data; unspecified registers (e.g., edx)
at 0x830f53c.
Hardware watchpoint 3: target_flags

Old value = 8388808
New value = 8405192
override_options () at ../../gcc/config/i386/i386.c:1614
1614      if (TARGET_SSEREGPARM
(gdb) c
Continuing.
During symbol reading, incomplete CFI data; unspecified registers (e.g., eax)
at 0x830f53c.
During symbol reading, incomplete CFI data; unspecified registers (e.g., ecx)
at 0x830f53c.
During symbol reading, incomplete CFI data; unspecified registers (e.g., edx)
at 0x830f53c.
Hardware watchpoint 3: target_flags

Old value = 8405192
New value = 8405208
override_options () at ../../gcc/config/i386/i386.c:1667
1667      if ((flag_unwind_tables || flag_asynchronous_unwind_tables
(gdb) c
Continuing.
During symbol reading, incomplete CFI data; unspecified registers (e.g., eax)
at 0x830f53c.
During symbol reading, incomplete CFI data; unspecified registers (e.g., ecx)
at 0x830f53c.
During symbol reading, incomplete CFI data; unspecified registers (e.g., edx)
at 0x830f53c.
GNU C version 4.1.0 (i686-pc-linux-gnu)
        compiled by GNU C version 3.4.6 20060404 (Red Hat 3.4.6-3).
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 2547d670e9349240a4187f725ff2e074

Program exited normally.
(gdb)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29049