[Bug gcov-profile/93754] [GCOV] incorrect coverage for user-defined "free" function

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93754

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
But it's actually called twice.  The second invocation is from libgcov:

#0  free (ptr=0x606280) at t.c:3
#1  0x00002aaaaad41d8e in _IO_new_fclose (fp=0x606280) at iofclose.c:84
#2  0x000000000040139e in __gcov_close ()
    at /space/rguenther/src/svn/gcc-9-branch/libgcc/../gcc/gcov-io.c:212
#3  0x0000000000401b59 in dump_one_gcov (run_max=1, run_counted=0, 
    gf=<synthetic pointer>, gi_ptr=<optimized out>)
    at /space/rguenther/src/svn/gcc-9-branch/libgcc/libgcov-driver.c:545
#4  gcov_do_dump (list=<optimized out>, run_counted=0)
    at /space/rguenther/src/svn/gcc-9-branch/libgcc/libgcov-driver.c:584
#5  0x00000000004025e0 in __gcov_dump_one (root=0x6042c0 <__gcov_root>)
    at /space/rguenther/src/svn/gcc-9-branch/libgcc/libgcov-driver.c:607
#6  __gcov_dump_one (root=0x6042c0 <__gcov_root>)
    at /space/rguenther/src/svn/gcc-9-branch/libgcc/libgcov-driver.c:602
#7  __gcov_exit ()
    at /space/rguenther/src/svn/gcc-9-branch/libgcc/libgcov-driver.c:623
#8  0x0000000000400e0e in _GLOBAL__sub_D_00100_1_free () at t.c:15
#9  0x00002aaaaaabb2b3 in _dl_fini () at dl-fini.c:235
#10 0x00002aaaaad0bd78 in __run_exit_handlers (status=1, 
    listp=0x2aaaab0876f8 <__exit_funcs>, 
    run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true)
    at exit.c:83
#11 0x00002aaaaad0bdca in __GI_exit (status=<optimized out>) at exit.c:105
#12 0x00002aaaaacf3f91 in __libc_start_main (main=0x400dac <main>, argc=1, 
    argv=0x7fffffffdd98, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fffffffdd88)
    at ../csu/libc-start.c:342
#13 0x0000000000400cca in _start () at ../sysdeps/x86_64/start.S:120

your 'free' function interposes the one from libc.