Hello,
In our GCC porting, we use newlib instead of libc. Today I tried to use
profiling feedback based optimization with option -fprofile-arcs. But
the executable doesn't produce .gcda file. I examined the disassembled
binary file and found the following functions are basically just dummy
ones: __gcov_init, __gcov_flush, __gcov_merge_add. I checked libgcov.c
that contains these functions and found following code.
#if defined(inhibit_libc)
/* If libc and its header files are not available, provide dummy
functions. */
#ifdef L_gcov
void __gcov_init (struct gcov_info *p __attribute__ ((unused))) {}
void __gcov_flush (void) {}
#endif
#ifdef L_gcov_merge_add
void __gcov_merge_add (gcov_type *counters __attribute__ ((unused)),
unsigned n_counters __attribute__ ((unused))) {}
#endif
#ifdef L_gcov_merge_single
void __gcov_merge_single (gcov_type *counters __attribute__ ((unused)),
unsigned n_counters __attribute__ ((unused)))
{}
#endif
#ifdef L_gcov_merge_delta
void __gcov_merge_delta (gcov_type *counters __attribute__ ((unused)),
unsigned n_counters __attribute__ ((unused)))
{}
#endif
Both -Dinhibit_libc and -DL_gcov are used as shown in our building log
file. I guess -Dinhibit_libc is added because we used newlibc instead
of glibc. I tried to grep these functions in newlibc and didn't find
them. My question is how to enable gcov with newlibc. Do I need to
write my own versions of them? Any suggestion is greatly appreciated.
Cheers,
Bingfeng Mei
Broadcom UK
