https://bugs.llvm.org/show_bug.cgi?id=38180
Bug ID: 38180
Summary: For programs which fork, some lines are wrongly
considered as hit twice
Product: compiler-rt
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: profile
Assignee: unassignedb...@nondot.org
Reporter: mcastelluc...@mozilla.com
CC: llvm-bugs@lists.llvm.org
For example:
-: 0:Source:main.c
-: 0:Graph:main.gcno
-: 0:Data:main.gcda
-: 0:Runs:2
-: 0:Programs:1
-: 1:#include <unistd.h>
-: 2:
function main called 2 returned 100% blocks executed 100%
-: 3:int main(void) {
2: 4: int j = 22;
-: 5:
2: 6: fork();
-: 7:
2: 8: int i = 7;
-: 9:
2: 10: return 0;
-: 11:}
With GCC:
-: 0:Source:main.c
-: 0:Graph:main.gcno
-: 0:Data:main.gcda
-: 0:Runs:1
-: 0:Programs:1
-: 1:#include <unistd.h>
-: 2:
1: 3:int main(void) {
1: 4: int j = 22;
-: 5:
1: 6: fork();
-: 7:
2: 8: int i = 7;
-: 9:
2: 10: return 0;
-: 11:}
The difference is probably due to the fact that GCC injects a __gcov_flush call
before the actual fork (similarly for execl, execlp, ...).
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