https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126248
Bug ID: 126248
Summary: OpenACC] 'copyout' allowed modifiers alwaysin vs
alwaysout
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: zhonghao at pku dot org.cn
CC: jakub at gcc dot gnu.org
Target Milestone: ---
There is a typo in the official OpenACC standard document. Here is the code:
int main() {
int a[100];
// According to the corrected standard intent, 'alwaysout' should be valid
for 'copyout'
#pragma acc parallel copyout(alwaysout: a[0:100])
{
a[0] = 1;
}
return 0;
}
The latest GCC reports an error:
<source>: In function 'int main()':
<source>:4:43: error: found ':' in nested-name-specifier, expected '::'
4 | #pragma acc parallel copyout(alwaysout: a[0:100])
| ^
| ::
<source>:4:34: error: 'alwaysout' has not been declared
4 | #pragma acc parallel copyout(alwaysout: a[0:100])
| ^~~~~~~~~
<source>:4:34: error: '<expression error>::a' has not been declared
<source>:4:46: error: expected ')' before '[' token
4 | #pragma acc parallel copyout(alwaysout: a[0:100])
| ^
| )
Compiler returned: 1
An LLVM developer discovered the logical inconsistency and discussed it with
the OpenACC mailing list. They confirmed it was a standardization error and had
fixed this bug:
https://github.com/llvm/llvm-project/commit/0a2b6f6c1cc796bcac38d1c6b44d76de6049ea12
