[llvm-bugs] [Bug 31428] New: [OpenMP] variable named like directive name modifier

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Dec 19 05:31:51 PST 2016


            Bug ID: 31428
           Summary: [OpenMP] variable named like directive name modifier
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: trass3r at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Not sure if this code has become illegal with the newer OpenMP versions or if
it's a bug.
But the information should be conveyed in the error, not in a warning.

I usually have to disable -Wignored-pragmas in cl mode because of the many
msvc-specific pragmas in some codebases.
In general it would be nice to have a separate category for OpenMP or make it
errors right away.

struct A
    int size() { return 1; }

int main()
    A target;
    #pragma omp parallel if(target.size() > 65535)

"C:\Program Files\LLVM\bin\clang.exe" -v -fopenmp -O2 -c test.cpp
clang version 4.0.0 (trunk 290097)
Target: x86_64-pc-windows-msvc
test.cpp:9:32: warning: missing ':' after directive name modifier - ignoring
        #pragma omp parallel if(target.size() > 65535)
test.cpp:9:32: error: expected expression
test.cpp:9:32: error: expected ')'
test.cpp:9:25: note: to match this '('
        #pragma omp parallel if(target.size() > 65535)

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