[Bug driver/45582] New: gcda file names collision when profiling

[bayerntoni at hotmail dot de]

I got some "coverage mismatch for function" messages during the -fprofile-use
stage.

input/proc.c: In function 'Proc_2':
input/proc.c:370:1: error: coverage mismatch for function 'Proc_2' while
reading
 counter 'arcs'
input/proc.c:370:1: note: checksum is 423e382 instead of 90c94998
input/proc.c: In function 'Proc_3':
input/proc.c:370:1: error: coverage mismatch for function 'Proc_3' while
reading
 counter 'arcs'
input/proc.c:370:1: note: checksum is dc2432cd instead of d4d17dae
input/proc.c: In function 'Proc_1':
input/proc.c:370:1: error: coverage mismatch for function 'Proc_1' while
reading
 counter 'arcs'
input/proc.c:370:1: note: checksum is 85cc36f8 instead of 3e60643f
input/proc.c: In function 'Proc_4':
input/proc.c:370:1: error: coverage mismatch for function 'Proc_4' while
reading
 counter 'arcs'
input/proc.c:370:1: note: checksum is 96ab6db0 instead of 7edb2a20
input/proc.c: In function 'Proc_5':
input/proc.c:370:1: error: coverage mismatch for function 'Proc_5' while
reading
 counter 'arcs'
input/proc.c:370:1: note: checksum is 1e3fe0b3 instead of 4d17a460
input/proc.c: In function 'main':
input/proc.c:370:1: error: coverage mismatch for function 'main' while reading
c
ounter 'arcs'

Source tree is something like:

.
|-- A
|   |-- foo.h
|   `-- proc.c
|-- B
|   |-- bar.h
|   `-- proc.c
`-- main.c

Generation stage: gcc -fprofile-gen main.c A/proc.c B/proc.c -o main.exe
I run main.exe.
Feedback stage: gcc -fprofile-use main.c A/proc.c B/proc.c -o main.exe
Then I get all these error messages.
The problem is that the source tree contain two files with the same name
(proc.c) and the instrumented executable generates the gcda files in the
working directory, not in the directories containing the source files.
The instrumented executable generates proc.gcda (from proc.c in A) and
overwrites this one by proc.gcda (from proc.c in B). Or the opposite, I don't
know.
I can't find a command line switch to control that.


-- 
           Summary: gcda file names collision when profiling
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bayerntoni at hotmail dot de
  GCC host triplet: i386-pc-mingw32
GCC target triplet: i386-pc-mingw32


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45582