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gcc-3.X: -gdwarf-2 breaks C++ exceptions for DJGPP (where to look?)
- From: pavenis at lanet dot lv
- To: gcc-bugs at gcc dot gnu dot org
- Cc: djgpp-workers at delorie dot com
- Date: Thu, 31 Jan 2002 18:59:57 +0200
- Subject: gcc-3.X: -gdwarf-2 breaks C++ exceptions for DJGPP (where to look?)
I have found that using DWARF-2 debugging information for
gcc-3.X (both gcc-3.0.3 and CVS head) breaks C++ exceptions
for target i586-pc-msdosdjgpp.
C++ exceptions works for this target both with -gcoff and -gstabs.
Contents of .eh_frame section is identical if I use -gcoff and -gstabs
but slightly different when I specify -gdwarf-2. An attempt to manually
copy in contents of .eh_frame section in assembler file (from one built
using -gstabs) fixes the problem.
So it seems that use of -gdwarf-2 causes the generation of wrong contents
of .eh_frame section. As far as I verified there is no similar problem
for i686-pc-linux-gnu
Andris
PS. here are diffs between assembler sources (.eh_frame section only).
Other compiler options (-O2) were identical for all tests and code
in .text section were identical both when I requested DWARF2
and stabs debugging info
--- exc_stabs.eh Thu Jan 31 18:47:56 2002
+++ exc_dwarf.eh Thu Jan 31 18:47:54 2002
@@ -13,7 +13,7 @@
.long ___gxx_personality_v0
.byte 0x0 / LSDA Encoding (absolute)
.byte 0xc / DW_CFA_def_cfa
- .uleb128 0x5
+ .uleb128 0x4
.uleb128 0x4
.byte 0x88 / DW_CFA_offset, column 0x8
.uleb128 0x1
@@ -31,12 +31,12 @@
.long LCFI0-LFB1
.byte 0xe / DW_CFA_def_cfa_offset
.uleb128 0x8
- .byte 0x84 / DW_CFA_offset, column 0x4
+ .byte 0x85 / DW_CFA_offset, column 0x5
.uleb128 0x2
.byte 0x4 / DW_CFA_advance_loc4
.long LCFI1-LCFI0
.byte 0xd / DW_CFA_def_cfa_register
- .uleb128 0x4
+ .uleb128 0x5
.byte 0x4 / DW_CFA_advance_loc4
.long LCFI3-LCFI1
.byte 0x83 / DW_CFA_offset, column 0x3
@@ -61,12 +61,12 @@
.long LCFI5-LFB2
.byte 0xe / DW_CFA_def_cfa_offset
.uleb128 0x8
- .byte 0x84 / DW_CFA_offset, column 0x4
+ .byte 0x85 / DW_CFA_offset, column 0x5
.uleb128 0x2
.byte 0x4 / DW_CFA_advance_loc4
.long LCFI6-LCFI5
.byte 0xd / DW_CFA_def_cfa_register
- .uleb128 0x4
+ .uleb128 0x5
.byte 0x4 / DW_CFA_advance_loc4
.long LCFI7-LCFI6
.byte 0x2e / DW_CFA_GNU_args_size
@@ -82,7 +82,4 @@
.p2align 2
LEFDE3:
/NO_APP
- .text
- .stabs "",100,0,0,Letext
-Letext:
- .ident "GCC: (GNU) 3.1 20020129 (experimental)"
+ .section .text