Segmentation fault at gcov exit

[Mason]

On 19/10/2017 17:29, Miguel Munoz wrote:

> I'm running a C program using gcov and I get a segmentation fault when
> gcov is dumping the results at the end of the execution. The program
> exits correctly when compiled without coverage.
> 
> The problem appears when one of the files contains a function call to
> an extern function defined in another file. If I comment this call, no
> SIGSEGV occurs. If I leave the call and compile without coverage, the
> SIGSEGV also disappears.
> 
> I'm compiling with the options: -O0 -g -fprofile-arcs -ftest-coverage.
> Adding -Wall -Wextra doesn't show anything suspicious.
> 
> Could you help me debugging this error? The backtrace doesn't give me
> any source file or line number inside the gcov code, and I don't know
> how to investigate the problem further.

I cannot reproduce your issue with a trivial test case.

$ cat main.c 
extern int foo(void);
int main(void) { return foo(); }
$ cat foo.c 
int foo(void) { return 0; }
$ gcc-7 -O0 -g -fprofile-arcs -ftest-coverage foo.c main.c 
$ ./a.out 
$ echo $?
0


If you provide a reproducible test case, some people might be able
to help.

Regards.