[llvm-bugs] [Bug 38695] New: .file directive suppresses debuginfo

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38695

            Bug ID: 38695
           Summary: .file directive suppresses debuginfo
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: MC
          Assignee: unassignedbugs at nondot.org
          Reporter: brian.cain at gmail.com
                CC: llvm-bugs at lists.llvm.org

The presence of ".file" mutes debug info generated by the assembler as of
r328208 – logic in AsmParser::enabledGenDwarfForAssembly().

~~~~~~~~~


$ cat file_.S 
//.file 1 "file.S"
.file "file_other.S"
.text

f1:
              nop
.size f1, .-f1

$ /local/mnt/workspace/install/gcc-8.1/bin/gcc-8.1 -g -o out.o -c file_.S ;
objdump -t out.o 

out.o:     file format elf64-x86-64

SYMBOL TABLE:
0000000000000000 l    df *ABS*              0000000000000000 file_other.S
0000000000000000 l    d  .text   0000000000000000 .text
0000000000000000 l    d  .data  0000000000000000 .data
0000000000000000 l    d  .bss    0000000000000000 .bss
0000000000000000 l       .text     0000000000000001 f1
0000000000000000 l    d  .debug_info    0000000000000000 .debug_info
0000000000000000 l    d  .debug_abbrev             0000000000000000
.debug_abbrev
0000000000000000 l    d  .debug_line    0000000000000000 .debug_line
0000000000000000 l    d  .debug_aranges           0000000000000000
.debug_aranges


$ /local/mnt/workspace/install/clang_nightly_2018_Jul27/bin/clang  -g -o out.o
-c file_.S ; objdump -t out.o 

out.o:     file format elf64-x86-64

SYMBOL TABLE:
0000000000000000 l    df *ABS*              0000000000000000 file_other.S
0000000000000000 l       .text     0000000000000001 f1

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