duplicate .debug_line sections

[rillian]

This isn't always reproducible, but for the last couple of weeks (on fedora 14) I've sometimes gotten messages like:

assemble [llvm]: test/run-pass/arith-0-boot.s
test/run-pass/arith-0-boot.s: Assembler messages:
test/run-pass/arith-0-boot.s:672: Fatal error: duplicate .debug_line sections
test/run-pass/native-mod-boot.s: Assembler messages:
test/run-pass/native-mod-boot.s:1244: Fatal error: duplicate .debug_line sections
test/run-pass/native-boot.s: Assembler messages:
test/run-pass/native-boot.s:938: Fatal error: duplicate .debug_line sections

Sadly, there really are duplicate .debug_info sections:

$ make <...> test/run-pass/arith-0-boot.s
[...]
$ fgrep -n .debug_info test/run-pass/arith-0-boot.s
241:    .section    .debug_info,"",@progbits
508:    .section    .debug_info,"",@progbits

[rillian]

Perhaps more helpful:

$ fgrep -n -C 3 .debug_info test/run-pass/arith-0-boot.s
238-                                        # End of file scope inline assembly
239-    .section    .debug_frame,"",@progbits
240-.Lsection_debug_frame:
241:    .section    .debug_info,"",@progbits
242-.Lsection_info:
243-    .section    .debug_abbrev,"",@progbits
244-.Lsection_abbrev:
--
505-    .uleb128    2               # Offset
506-    .align  4
507-.Ldebug_frame_end1:
508:    .section    .debug_info,"",@progbits
509-.Linfo_begin1:
510-    .long   155                     # Length of Compilation Unit Info
511-    .short  2                       # DWARF version number

[rillian]

Graydon commented on irc that this looked like an llvm issue, since the sections aren't being emitted directly from the rust code.

This particular report was with the Debug+Asserts build of llvm r117920 with 4.5.1 20100924 (Red Hat 4.5.1-4) on x86_64. Today's r118171 fails similarly.

[graydon]

WONTFIX (not required for bootstrapping).