https://bugs.llvm.org/show_bug.cgi?id=42392
Bug ID: 42392
Summary: Please improve -Wuninitialized warnings for OpenMP
programs
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C
Assignee: unassignedclangb...@nondot.org
Reporter: vyacheslav.p.zakha...@intel.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
The code below compiles silently with "-fopenmp -fopenmp-targets=x86_64". W/o
-fopenmp the errors become obvious:
warn.c:5:5: warning: variable 'r' is uninitialized when used here
[-Wuninitialized]
warn.c:14:5: warning: variable 'r' is uninitialized when used here
[-Wuninitialized]
warn.c:21:12: warning: variable 'r' is uninitialized when used here
[-Wuninitialized]
Can this be improved?
-- code --
int reduction(int *input) {
int i, r;
#pragma omp target parallel for map(to: input) reduction(+: r)
for (i = 0; i < 100; ++i)
r += input[i];
return r;
}
int linear() {
int i, r;
#pragma omp target parallel for linear(r)
for (i = 0; i < 100; ++i)
r += 1;
return r;
}
void firstprivate(int *input) {
int r;
#pragma omp target firstprivate(r) map(tofrom: input[0:1])
*input = r;
}
-- code --
--
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