http://sourceware.org/bugzilla/show_bug.cgi?id=12409
Summary: --compress-debug-sections doesn't work on empty DWARF
sections
Product: binutils
Version: 2.22 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gas
AssignedTo: unassig...@sources.redhat.com
ReportedBy: hjl.to...@gmail.com
CC: ccout...@google.com
Gcc may generate assembly codes with empty DWARF sections.
--compress-debug-sections failed on them:
[hjl@gnu-6 compress-4]$ cat x.s
.file "__dn_comp.c"
.section .debug_abbrev,"",@progbits
.Ldebug_abbrev0:
.section .debug_info,"",@progbits
.Ldebug_info0:
.section .debug_line,"",@progbits
.Ldebug_line0:
.text
.Ltext0:
.Letext0:
.section .debug_abbrev
.byte 0x0
[hjl@gnu-6 compress-4]$ make
./as --compress-debug-sections -o compressed.o x.s
objcopy --decompress-debug-sections compressed.o decompressed.o
./as --nocompress-debug-sections -o x.o x.s
readelf -w x.o
Contents of the .debug_abbrev section:
Section '.debug_info' has no debugging data.
Section '.debug_line' has no debugging data.
readelf -w decompressed.o
Contents of the .debug_abbrev section:
readelf: Warning: Corrupt unit length (0) found in section .zdebug_info
Raw dump of debug contents of section .zdebug_line:
readelf: Warning: Only DWARF version 2, 3 and 4 line info is currently
supported.
cmp decompressed.o x.o
decompressed.o x.o differ: byte 41, line 1
make: *** [all] Error 1
[hjl@gnu-6 compress-4]$
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