[llvm-bugs] [Bug 41514] New: [Parser] Pragma inside statement causes error

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41514

            Bug ID: 41514
           Summary: [Parser] Pragma inside statement causes error
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvm at meinersbur.de
                CC: hfinkel at anl.gov, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

The following source does not compile:

    int main() {
        return
    #pragma STDC FENV_ACCESS OFF
               0;
    }

$ clang test.c
test.c:5:14: error: expected expression
#pragma STDC FENV_ACCESS OFF
             ^
1 error generated.

While this one does:

    int main() {
    #pragma STDC FENV_ACCESS OFF
        return 0;
    }

$ clang test.c


The reason is that the #pragma inserts an annotation token into the
preprocessor's token stream. This annotation is only handled before a new
statement is expected (method
Parser::ParseStatementOrDeclarationAfterAttributes), but not within e.g.
expressions.

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