[Bug middle-end/19985] [3.4/4.0/4.1 Regression] executables created with -fprofile-arcs -ftest-coverage segfault in gcov_exit ()

[matz at suse dot de]

------- Additional Comments From matz at suse dot de  2005-06-21 20:31 -------
This patch seems to be the reason for warnings like: 
  In file included from ../../gcc/gcov-io.h:239, 
                   from ../../gcc/libgcov.c:51: 
    ./auto-host.h:23:1: warning: "DEFAULT_USE_CXA_ATEXIT" redefined 
  In file included from ./tm.h:12, 
                   from ../../gcc/libgcov.c:39: 
    ../../gcc/defaults.h:712:1: warning: this is the location of the previous 
    definition 
 
There are now many warnings of this type during building gcc.  This is 
because auto-host.h is now included, but _after_ all the other headers, 
which do something like 
  #ifndef BLA 
  #define BLA ... 
  #endif 
Because auto-host.h is not yet included there, BLA is not defined, so 
the default will be defined, and then auto-host.h is included leading to 
double definitions.  libgcov.c talks about not able to include <config.h> 
because that's for the host, not for the target.  So I don't know if 
auto-host.h (also for the host) should be included at all.  But if it is, 
then it has to be earlier.  Perhaps in libgcov.c directly as first file. 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19985