[LLVMbugs] [Bug 23431] New: Unhelpful diagnostics upon unknown function-like macro invocation

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23431

            Bug ID: 23431
           Summary: Unhelpful diagnostics upon unknown function-like macro
                    invocation
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: stephan.bergmann.secondary at googlemail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

> $ cat test.cc
> void f() { M("" << ""); }
>
> $ clang++ -fsyntax-only test.cc
> test.cc:1:17: error: invalid operands to binary expression ('const char *' and 'const char *')
> void f() { M("" << ""); }
>              ~~ ^  ~~
> 1 error generated.

doesn't mention at all that M is unknown, and if M is e.g. defined as

  #define M(x) std::cout << x

then the provided diagnostics is kind of a red herring.  (Happens in practice,
cf. e.g.,
<http://cgit.freedesktop.org/libreoffice/core/commit/?id=c47f7dfb3045b7b029859ea1fac80143b996945b>.)

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