https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101342
Bug ID: 101342
Summary: [Gcov] Wrong coverage with "for(;;a++)" loop
statement
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: byone.heng at gmail dot com
CC: marxin at gcc dot gnu.org
Target Milestone: ---
$./gcc -v
Using built-in specs.
COLLECT_GCC=./gcc
COLLECT_LTO_WRAPPER=/home/x/project/gcc/build/install/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --prefix=/home/x/project/gcc/build/install
--enable-checking=release --enable-languages=c,c++ --disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20210105 (experimental) (GCC)
$cat test.c
volatile long int true_var = 1;
const long int false_var = 0;
int a=0;
int main() {
for (;; a++) {
int c[1];
if( true_var > 0 )
{
if (a) {
break;
a;
continue; /* count(1) */
}
continue;
} /* count(1) */
}
return 0;
}
$gcc -O0 --coverage test.c;./a.out;gcov test;cat test.c.gcov
-: 1:/* { dg-options "-fprofile-arcs -ftest-coverage" } */
-: 2:/* { dg-do run { target native } } */
-: 3:
-: 4:volatile long int true_var = 1;
-: 5:const long int false_var = 0;
-: 6:
-: 7:int a=0;
-: 8:
2: 9:int main() {
1: 10: for (;; a++) {
-: 11: int c[1];
2: 12: if( true_var > 0 )
-: 13: {
2: 14: if (a) {
1: 15: break;
-: 16: a;
1: 17: continue; /* count(1) */
-: 18: }
1: 19: continue;
-: 20: } /* count(1) */
-: 21: }
-: 22:
1: 23: return 0;
-: 24:}
-: 25:
-: 26:/* { dg-final { run-gcov gcov-pr85217.c } } */
Line 10 is wrongly marked as executed once which should be executed twice.
