[llvm-bugs] [Bug 43502] New: Clang will write absolute paths into DW_AT_GNU_dwo_name even with -fdebug-prefix-map / -fdebug-compilation-dir .

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43502

            Bug ID: 43502
           Summary: Clang will write absolute paths into
                    DW_AT_GNU_dwo_name even with -fdebug-prefix-map /
                    -fdebug-compilation-dir .
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: cbiesinger at google.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 22602
  --> https://bugs.llvm.org/attachment.cgi?id=22602&action=edit
testcase script

Tested using Chrome's clang, which is trunk.

$clang   -fdiagnostics-color=never -gsplit-dwarf
-fdebug-prefix-map=$dir=\$ORIGIN -c  -o $dir/outputs/foo.o $dir/inputs/foo.c

$clang  $dir/outputs/foo.o  -fdiagnostics-color=never -gsplit-dwarf
-fdebug-prefix-map=$dir=\$ORIGIN  -lm   -o $dir/outputs/foo

$ readelf --debug-dump /tmp/outputs/foo
[...]
    <10>   DW_AT_comp_dir    : (indirect string, offset: 0x0): $ORIGIN
    <14>   DW_AT_GNU_pubnames: 1
    <14>   DW_AT_GNU_dwo_name: (indirect string, offset: 0x8):
/tmp/outputs/foo.dwo
[...]

See attached script that creates this testcase. Using clang from chrome trunk
as of Sep 24 (same result as clang-8)

The expected result is that DW_AT_GNU_dwo_name is $ORIGIN/outputs/foo.dwo.

Same result if I use '-fdebug-compilation-dir .

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