[LLVMbugs] [Bug 8916] New: clang tot takes a long, long time (maybe forever) to compile Cryptopp's sha.cpp

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8916

           Summary: clang tot takes a long, long time (maybe forever) to
                    compile Cryptopp's sha.cpp
           Product: clang
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: mclow at qualcomm.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=5962)
 --> (http://llvm.org/bugs/attachment.cgi?id=5962)
Preprocessed source code for sha.cpp

When trying to compile CryptoPP <http://www.cryptopp.com>, there was a file
that appeared to hang the compiler. I don't know for sure, but I got impatient
and killed it after 30 minutes.

This was done with clang/llvm built from revision 122872

attached file was created via:
      clang++ -Wno-tautological-compare -DNDEBUG -g -DCRYPTOPP_DISABLE_ASM -E
sha.cpp > sha.i

Here are some timings:

$ time clang++ -Wno-tautological-compare -DNDEBUG -g         -arch x86_64 -arch
i386 -DCRYPTOPP_DISABLE_ASM -pipe -fsyntax-only sha.cpp 
real    6.234s
$ time clang++ -Wno-tautological-compare -DNDEBUG -g         -arch x86_64 -arch
i386 -DCRYPTOPP_DISABLE_ASM -pipe -c sha.cpp 
real 7.863s
$ time clang++ -Wno-tautological-compare -DNDEBUG -g -O1 -arch x86_64 -arch
i386 -DCRYPTOPP_DISABLE_ASM -pipe -c sha.cpp 
real 17.882s
$ time clang++ -Wno-tautological-compare -DNDEBUG -g -O2 -arch x86_64 -arch
i386 -DCRYPTOPP_DISABLE_ASM -pipe -c sha.cpp 
.... long, long time; I killed it after 30 minutes.

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