[llvm-bugs] [Bug 33162] New: Many arguments to function causes false use of undeclared identifier

via llvm-bugs llvm-bugs at lists.llvm.org
Wed May 24 19:41:00 PDT 2017


            Bug ID: 33162
           Summary: Many arguments to function causes false use of
                    undeclared identifier
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: wsnyder at wsnyder.org
                CC: llvm-bugs at lists.llvm.org

Created attachment 18506
  --> https://bugs.llvm.org/attachment.cgi?id=18506&action=edit
param_32k.c test file

With the attached file,

$ clang ./param_32k.c
./param_32k.c:4103:18: error: use of undeclared identifier 'd32767'; did you
mean 'd32768'?

This program works with GCC. It appears that clang gets confused by the use of
over 32,768 arguments to this function. Perhaps a "signed short" is used
somewhere by mistake?

While this seems contrived, this is machine generated code (probably obviously)
from a Verilog-to-C++ compiler called Verilator.

It would be nice to have more than 64K arguments allowed, as at present clang
does not have any other limits I am aware of that Verilator has found and needs
to work around (unlike MSVC++), but if not desired to be supported a clean
error message should be provided (presumably at the 32K-1st argument).

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