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[Bug gas/12409] New: --compress-debug-sections doesn't work on empty DWA

From: hjl.tools at gmail dot com
Subject: [Bug gas/12409] New: --compress-debug-sections doesn't work on empty DWARF sections
Date: Tue, 18 Jan 2011 18:26:25 +0000


           Summary: --compress-debug-sections doesn't work on empty DWARF
           Product: binutils
           Version: 2.22 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: address@hidden
        ReportedBy: address@hidden
                CC: address@hidden

Gcc may generate assembly codes with empty DWARF sections.
--compress-debug-sections failed on them:

address@hidden compress-4]$ cat x.s
    .file    "__dn_comp.c"
    .section    .debug_abbrev,"",@progbits
    .section    .debug_info,"",@progbits
    .section    .debug_line,"",@progbits
    .section    .debug_abbrev
    .byte    0x0
address@hidden 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
cmp decompressed.o x.o
decompressed.o x.o differ: byte 41, line 1
make: *** [all] Error 1
address@hidden compress-4]$

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