https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104703
Bug ID: 104703
Summary: GNAT 11.2 exception traceback output is mostly garbled
on Intel x64 (MSYS2)
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ada
Assignee: unassigned at gcc dot gnu.org
Reporter: cthowie at netzero dot net
Target Milestone: ---
PLATFORM: GCC 11.2 Revision 8 toolchain for MSYS2 on Windows 10 Intel x64 CPU.
Note GNAT FSF 8.2 Revision 1 compiler does NOT have the problem as shown below.
ISSUE: I upgraded from GNAT FSF 8.2 to GNAT FSF 11.2 and noticed the
"traceback" output is now garbled as demonstrated below with a trivial Ada
program:
EXAMPLE PROGRAM DEMONSTRATING THE ISSUE:
procedure Main
is
procedure Inner with No_Inline is
begin
raise Program_Error;
end Inner;
begin
Inner;
end Main;
BUILD INSTRUCTIONS:
Save the above example program to e.g., "main.adb" then run:
gnatmake -g main.adb -bargs -Es
so we get symbolic traceback for the raised exception. Then run the 'main.exe'
from the command line. I get this broken trace (only the bottom 4 lines for
KERNEL32.DLL and ntdll.dll are correct):
$ ./main
raised PROGRAM_ERROR : main.adb:8 explicit raise
[C:\temp\GNAT bug\main.exe]
0x7ff6ecbe1a1e ??? at ???
[C:\temp\GNAT bug\main.exe]
0x7ff6ecbe1a41 ??? at ???
[C:\temp\GNAT bug\main.exe]
0x7ff6ecbe1992 ??? at ???
[C:\temp\GNAT bug\main.exe]
0x7ff6ecbe13af ??? at ???
[C:\temp\GNAT bug\main.exe]
0x7ff6ecbe14e4 ??? at ???
[C:\windows\System32\KERNEL32.DLL]
0x7ffb5c5f81f2
[C:\windows\SYSTEM32\ntdll.dll]
0x7ffb5f05a24f
The trace is broken even:
1) if I bind with the "-Ea" binder flag
2) if I use the GNAT system package and Text_IO e.g.,
with GNAT.Traceback.Symbolic; use GNAT.Traceback.Symbolic;
and add this to the bottom of the main subprogram:
exception
when e : others => Put_Line (Symbolic_Traceback (e));
Note that the traceback is correct if I compile exactly as above but with GNAT
FSF 8.2 Revision 1 compiler for MSYS2:
raised PROGRAM_ERROR : main.adb:8 explicit raise
[C:\temp\GNAT bug\main.exe]
Main.Inner at main.adb:8
Main at main.adb:12
Main at b~main.adb:188
__tmainCRTStartup at crtexe.c:333
mainCRTStartup at crtexe.c:217
[C:\windows\System32\KERNEL32.DLL]
0x7ffb5c5f81f2
[C:\windows\SYSTEM32\ntdll.dll]
0x7ffb5f05a24f
