http://llvm.org/bugs/show_bug.cgi?id=8917
Summary: clang much slower than gcc compiling CryptoPP sources
Product: clang
Version: trunk
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Created an attachment (id=5965)
--> (http://llvm.org/bugs/attachment.cgi?id=5965)
preprocessed source code for sha.cpp
When trying to compile CryptoPP <http://www.cryptopp.com>, I noticed that the
compile times were much, much slower than gcc. Some of this is the optimizer,
but there's something going on in the front end, too.
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
Compare:
$ 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
with:
$ time g++ -DNDEBUG -g -O2 -arch x86_64 -arch i386 -DCRYPTOPP_DISABLE_ASM -pipe
-c sha.cpp
real 1.662s
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