Problem with gpc20060215 under Red Hat Enterprise Linux ES release

[Waldek Hebisch]

Angelo Fumagalli wrote:
> Running the gpc20060215 Test Suite (based on  gcc-3.4.4) under the Red Hat 
> environment, in particular:
> 
> Red Hat Enterprise Linux ES release 3 (Taroon Update 6)
> 
> as "uname -a" :
> 
> Linux tlvqpe 2.4.21-37.ELsmp #1 SMP Sep 7 13:28:55 EDT 2005 i686 i686 i386 
> GNU/Linux
> 
> we got some internal compiler error ...
> 
> Test Run By 4grpm on 2006-02-27 11:53:22
> Native configuration is i686-pc-linux-gnu (tlvqpe)
> gpc 20060215, based on gcc-3.4.4, flags: -g -O3 -W -Wall -Wno-unused
> 
> === gpc tests ===
> 
> Running target any
> Running testsuite ...
> 
> UNSUPPORTED: aregextest.pas
> FAIL: fjf932a.pas
> FAIL: fjf932b.pas
> 
> === gpc Summary ===
> 
> # of tests 5057
> # of expected passes 5054
> 
> 
> TEST fjf932a.pas: p/types.c:1887:find_field: failed assertion `unreachable 
> code'
> ./fjf932a.pas: In main program:
> ./fjf932a.pas:73: error: Internal compiler error.
> Please submit a full bug report to the GPC mailing list <gpc at gnu.de>.
> See <URL:http://www.gnu-pascal.de/todo.html> for details.
> failed
> TEST fjf932b.pas: p/types.c:1887:find_field: failed assertion `unreachable 
> code'
> ./fjf932b.pas: In main program:
> ./fjf932b.pas:62: error: Internal compiler error.
> Please submit a full bug report to the GPC mailing list <gpc at gnu.de>.
> See <URL:http://www.gnu-pascal.de/todo.html> for details.

Thank you for the info. I have too quickly assumed that line 1887 in 
p/types.c will never be executed. The following should fix the problem:

--- p/types.c	15 Feb 2006 02:03:12 -0000	1.10
+++ p/types.c	27 Feb 2006 21:51:28 -0000
@@ -1884,7 +1884,6 @@
                 tree field2 = sorted_fields[i], ret;
                 if (DECL_NAME (field2) == component)
                   {
-                    gcc_unreachable ();
                     field = field2;
                     break;
                   }


> ------------------------------------------------------------------------------
> Anyway, we tried to build our gpc application:
> no gpc compilation error found, but we got a segmentation fault
> when running out application:
> ------------------------------------------------------------------------------
> -bash-2.05b$ ./grfc.exe
> GRF>cc_gra_sc.smt /out=cc_gra_sc.c
> Segmentation fault
> 
> ----------------------------
> then trying to use gbd:
> ----------------------------
> 
> -bash-2.05b$ gdb grfc.exe
> GNU gdb Red Hat Linux (6.3.0.0-1.62rh)
> Copyright 2004 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 "i386-redhat-linux-gnu"...Using host libthread_db 
> library "/lib/tls/libthread_db.so.1".
> 
> (gdb) run
> Starting program: /dktlvqpe1/grfdev/ags/grfpkglnxv12/grfc.exe
> GRF>cc_gra_sc.smt /out=cc_gra_sc.c
> Die: DW_TAG_set_type (abbrev = 32, offset = 81793)
> has children: FALSE
> attributes:
> DW_AT_type (DW_FORM_ref4) constant ref: 81665 (adjusted)
> Dwarf Error: Cannot find type of die [in module 
> /dktlvqpe1/grfdev/ags/grfpkglnxv12/grfc.exe]
> (gdb) where
> Die: DW_TAG_set_type (abbrev = 32, offset = 81793)
> has children: FALSE
> attributes:
> DW_AT_type (DW_FORM_ref4) constant ref: 81665 (adjusted)
> Dwarf Error: Cannot find type of die [in module 
> /dktlvqpe1/grfdev/ags/grfpkglnxv12/grfc.exe]
> (gdb)
> 
> --------------------------------------------------------------------
> it seems to me that the our gdb versin (6.3.0.0-1.62rh) isn't compatibel 
> with gpc20060215.
> Which is the proper gdb version for gpc20060215 based on gcc-3.4.4 ?
> 
> Waiting for suggestions.
> 
> Thank you very much in advance.
> 
> Angelo Fumagalli 

This in a known problem with gdb -- all released gdb versions have problem
with Pascal DWARF-2 debug info. You can try `-gstabs+' to choose stabs
debug format. Or you may try patching gdb to get better Pascal DWARF-2
support:

http://www.math.uni.wroc.pl/~hebisch/gpc/gdb-6.3.diff


-- 
                              Waldek Hebisch
hebisch at math.uni.wroc.pl