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From: "njuwy at smail dot nju.edu.cn" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/99443] New: [GCOV] No coverage with "Aborted(core
 dumped)"
Date: Sun, 07 Mar 2021 08:34:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99443

            Bug ID: 99443
           Summary: [GCOV] No coverage with "Aborted(core dumped)"
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: njuwy at smail dot nju.edu.cn
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

$ gcc -v
Using built-in specs.
COLLECT_GCC=3Dgcc
COLLECT_LTO_WRAPPER=3D/usr/local/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto=
-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure -enable-checking=3Drelease -enable-languages=
=3Dc,c++
-disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (GCC)=20

$ cat test.c
#include <x86intrin.h>
#include <stdio.h>

extern void abort(void);

#ifdef __x86_64__
#define EFLAGS_TYPE unsigned long long int
#else
#define EFLAGS_TYPE unsigned int
#endif

int main() {
  printf("1\n");
  EFLAGS_TYPE flags =3D 0xD7; /* 111010111b  */
  __writeeflags(flags);
  flags =3D __readeflags();
  printf("2\n");
  if ((flags & 0xFF) !=3D 0xD7)
    abort();
  printf("3\n");
#ifdef DEBUG
  printf("PASSED\n");
#endif
}

$ gcc -O0 --coverage test.c;./a.out;gcov test;cat test.c.gcov
1
2
Aborted (core dumped)
test.gcda:cannot open data file, assuming not executed
File 'test.c'
Lines executed:0.00% of 8
Creating 'test.c.gcov'

File '/usr/local/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/ia32intrin.h'
Lines executed:0.00% of 3
Creating 'ia32intrin.h.gcov'

        -:    0:Source:test.c
        -:    0:Graph:test.gcno
        -:    0:Data:-
        -:    0:Runs:0
        -:    1:#include <x86intrin.h>
        -:    2:#include <stdio.h>
        -:    3:
        -:    4:extern void abort(void);
        -:    5:
        -:    6:#ifdef __x86_64__
        -:    7:#define EFLAGS_TYPE unsigned long long int
        -:    8:#else
        -:    9:#define EFLAGS_TYPE unsigned int
        -:   10:#endif
        -:   11:
    #####:   12:int main() {
    #####:   13:  printf("1\n");
    #####:   14:  EFLAGS_TYPE flags =3D 0xD7; /* 111010111b  */
        -:   15:  __writeeflags(flags);
    #####:   16:  flags =3D __readeflags();
    #####:   17:  printf("2\n");
    #####:   18:  if ((flags & 0xFF) !=3D 0xD7)
    #####:   19:    abort();
    #####:   20:  printf("3\n");
        -:   21:#ifdef DEBUG
        -:   22:  printf("PASSED\n");
        -:   23:#endif
        -:   24:}

We can see that line #13,#14 were executed,which means that main function
executed too. However, no coverage generated.=