Configuring with --enable-languages=c --disable-multilib --without-build-config
bootstrap fails with
Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
gcc/dse.o differs
make[2]: *** [compare] Error 1
The difference happens randomly but always at the same place. The difference
is in .debug_loc only, readelf -w differences are:
--- /tmp/t1 2010-01-29 14:06:09.000000000 +0100
+++ /tmp/t2 2010-01-29 14:06:14.000000000 +0100
@@ -29471,7 +29471,7 @@
Raw dump of debug contents of section .debug_line:
Offset: 0x0
- Length: 4841
+ Length: 4837
DWARF Version: 2
Prologue Length: 691
Minimum Instruction Length: 1
@@ -30960,7 +30960,7 @@
Extended opcode 4: set Discriminator to 1
Set is_stmt to 0
Special opcode 159: advance Address by 11 to 0x2412 and Line by 0 to 1384
- Extended opcode 4: set Discriminator to 6
+ Extended opcode 4: set Discriminator to 3
Special opcode 61: advance Address by 4 to 0x2416 and Line by 0 to 1384
Set is_stmt to 1
Advance Line by 217 to 1601
@@ -31171,7 +31171,7 @@
Special opcode 132: advance Address by 9 to 0x297b and Line by 1 to 1350
Special opcode 76: advance Address by 5 to 0x2980 and Line by 1 to 1351
Special opcode 109: advance Address by 7 to 0x2987 and Line by 6 to 1357
- Extended opcode 4: set Discriminator to 6
+ Extended opcode 4: set Discriminator to 3
Special opcode 174: advance Address by 12 to 0x2993 and Line by 1 to 1358
Special opcode 160: advance Address by 11 to 0x299e and Line by 1 to 1359
Special opcode 202: advance Address by 14 to 0x29ac and Line by 1 to 1360
@@ -31181,12 +31181,10 @@
Set is_stmt to 0
Advance PC by constant 17 to 0x29cc
Special opcode 89: advance Address by 6 to 0x29d2 and Line by 0 to 1374
- Extended opcode 4: set Discriminator to 3
- Special opcode 145: advance Address by 10 to 0x29dc and Line by 0 to 1374
Set is_stmt to 1
Advance Line by 195 to 1569
- Advance PC by constant 17 to 0x29ed
- Special opcode 173: advance Address by 12 to 0x29f9 and Line by 0 to 1569
+ Advance PC by 39 to 0x29f9
+ Copy
Special opcode 76: advance Address by 5 to 0x29fe and Line by 1 to 1570
Extended opcode 4: set Discriminator to 1
Set is_stmt to 0
@@ -31240,7 +31238,7 @@
Special opcode 6: advance Address by 0 to 0x2b78 and Line by 1 to 1434
Advance Line by -912 to 522
Special opcode 145: advance Address by 10 to 0x2b82 and Line by 0 to 522
- Extended opcode 4: set Discriminator to 3
+ Extended opcode 4: set Discriminator to 1
Advance Line by 930 to 1452
Advance PC by constant 17 to 0x2b93
Special opcode 201: advance Address by 14 to 0x2ba1 and Line by 0 to 1452
@@ -34190,10 +34188,10 @@
0000778d 00000000000048b1 00000000000048bb (DW_OP_reg2)
0000778d 00000000000048bb 000000000000490b (DW_OP_reg5)
0000778d 0000000000004bfb 0000000000004c00 (DW_OP_reg5)
- 0000778d 0000000000004c00 0000000000004c04 (DW_OP_breg7: 32)
+ 0000778d 0000000000004c00 0000000000004c04 (DW_OP_breg3: 24)
0000778d 0000000000004c1f 0000000000004c32 (DW_OP_reg5)
0000778d 0000000000004e01 0000000000004e1b (DW_OP_reg5)
- 0000778d 0000000000004e1b 0000000000004e1f (DW_OP_breg7: 32)
+ 0000778d 0000000000004e1b 0000000000004e1f (DW_OP_breg3: 24)
0000778d <End of list>
00007837 0000000000004921 00000000000049c1 (DW_OP_reg13)
00007837 00000000000049c1 00000000000049cb (DW_OP_reg13)
I now run into this regularly because contrib/compare-debug does not work
for me as the host compiler inserts a .comment.SUSE.OPT section whose
content depends on whether -g is specified or not.
--
Summary: [4.5 Regression] Random debug generation differences,
bootstrap fails
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Keywords: build
Severity: normal
Priority: P3
Component: debug
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rguenth at gcc dot gnu dot org
GCC target triplet: x86_64-*-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42896
