[Bug debugedit/33602] New: Try to support "relative" paths (-ffile-prefix-map=.)

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=33602

            Bug ID: 33602
           Summary: Try to support "relative" paths (-ffile-prefix-map=.)
           Product: debugedit
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: debugedit
          Assignee: unassigned at sourceware dot org
          Reporter: mark at klomp dot org
                CC: debugedit at sourceware dot org
  Target Milestone: ---

Some builds use -ffile-prefix-map=. or -fdebug-prefix-map=. this (seems to)
replace the current working directory at the start of a dir/file path with
"./".

Given that it depends on what the current working directory was when an object
file was created, which might be different for different object files linked
together "./" can mean different (absolute) paths in different compile units.

We might be able to recover the working directory using the --base dir given.
It must be some subdir under that path.

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