http://llvm.org/bugs/show_bug.cgi?id=15191
Bug ID: 15191
Summary: GCOVProfiling __gcov_flush only flushes the current
compilation unit
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Miscellaneous Instrumentation passes
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Using clang with -ftest-coverage -fprofile-arcs and calling __gcov_flush will
only flush the current compilation unit instead of flushing all of the coverage
data.
For instance:
$ cat foo.c
#include <stdio.h>
void foo() {
for (int i = 0; i < 10; i++) {
printf("foo %d\n", i);
}
__gcov_flush();
}
$ cat main.c
#include <stdio.h>
extern void foo();
int main() {
foo();
for (int i = 0; i < 10; i++) {
printf("main %d\n", i);
}
int *a;
*a = 4; // Crashes the app, so only the flushed coverage prints
}
$ clang -fprofile-arcs -ftest-coverage -g foo.c main.c
$ ./a.out
[1] 74979 segmentation fault ./a.out
$ gcov main.c
main.gcda:cannot open data file, assuming not executed
File 'main.c'
Lines executed:0.00% of 7
main.c:creating 'main.c.gcov'
If you do the same thing with gcc, it will flush all of the buffers thus, it
produces some coverage data for main.c.
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