[LLVMbugs] [Bug 4885] New: Warnings from compiling llvm with icc

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Fri Sep 4 07:50:50 PDT 2009


           Summary: Warnings from compiling llvm with icc
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core LLVM classes
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: idadesub at users.sourceforge.net
                CC: llvmbugs at cs.uiuc.edu

This bug is to track fixing the icc warnings. I'll be putting together a patch
to fix these. Here are the current ones:


/scratch/llvm/llvm/lib/Support/regcomp.c(259): warning #592: variable
"prevback" is used before its value is set
        sopno prevback = prevback;


/scratch/llvm/llvm/lib/Target/ARM/ARMJITInfo.cpp(202): warning #69: integer
conversion resulted in truncation


/scratch/llvm/llvm/lib/System/Mutex.cpp(119): remark #111: statement is
    return false;

Not sure what to do about this one, it looks like icc is inlining the
"pthread_enabled", and then seeing that there's no possible way to reach the
"return false" in:

  if (pthread_enabled)
    pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
    assert(mutex != 0);

    int errorcode = pthread_mutex_unlock(mutex);
    return errorcode == 0;
  return false;


/scratch/llvm/llvm/include/llvm/Support/Registry.h(80): warning #1170: invalid
redeclaration of nested class
      class iterator;

This one's a simple fix, "class iterator" is listed twice.


/scratch/llvm/llvm/include/llvm/Support/CommandLine.h(307): remark #1418:
external function definition with no prior declaration
  LocationClass<Ty> location(Ty &L) { return LocationClass<Ty>(L); }

this one is happening because the warning level is high enough to give
stylistic suggestions. This one is saying that you should declare functions
before implementing them, even if they're in a .h file.


/scratch/llvm/llvm/lib/Support/Timer.cpp(26): remark #1419: external
declaration in primary source file
  namespace llvm { extern raw_ostream *GetLibSupportInfoOutputFile(); }


/scratch/llvm/llvm/lib/Support/Timer.cpp(291): remark #1572: floating-point
equality and inequality comparisons are unreliable
    if (Total.UserTime)

For Timer.cpp, I could replace these with "if (Total.UserTime > 0)", but that
reads weird to me. There are a lot of these warnings though.


/scratch/llvm/llvm/lib/System/DynamicLibrary.cpp(33): remark #177: variable
"Dummy" was declared but never referenced
  } Dummy;

This is an easy fix, since this is a c++ file and doesn't need the trailing
name for the struct.

/scratch/llvm/llvm/lib/Support/APInt.cpp(1484): remark #177: variable "allOnes"
was declared but never referenced
    APInt allOnes = APInt::getAllOnesValue(d.getBitWidth());

/scratch/llvm/llvm/lib/Support/APInt.cpp(1486): remark #177: variable
"signedMax" was declared but never referenced
    APInt signedMax = APInt::getSignedMaxValue(d.getBitWidth());

/scratch/llvm/llvm/utils/TableGen/FastISelEmitter.cpp(219): warning #177:
function "<unnamed>::FastISelMap::PrintClass" was declared but never referenced
    void PrintClass(raw_ostream &OS);

/scratch/llvm/llvm/lib/VMCore/AsmWriter.cpp(1285): warning #177: function
"<unnamed>::AssemblyWriter::getModule" was declared but never referenced
    const Module* getModule() { return TheModule; }

Also simple fixes.


/scratch/llvm/llvm/lib/Transforms/IPO/PruneEH.cpp(111): remark #1599:
declaration hides variable "E" (declared at line 100)
            for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E;

We're getting a lot of these errors.


/scratch/llvm/llvm/lib/System/DynamicLibrary.cpp(28): warning #1128: a storage
class may not be specified here
  static struct ExplicitSymbolsDeleter {

Does this do anything? If not, I'll remove it.


/scratch/llvm/llvm/lib/System/Unix/Signals.inc(229): remark #181: argument is
incompatible with corresponding format string conversion
        fprintf(stderr, " + %tu",(char*)StackTrace[i]-(char*)dlinfo.dli_saddr);


I'll post more in a bit.

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