http://llvm.org/bugs/show_bug.cgi?id=21013
Bug ID: 21013
Summary: File takes relatively long in llvm but is parsed
relatively quickly
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13058
--> http://llvm.org/bugs/attachment.cgi?id=13058&action=edit
repro
Instruments says that 2.3s is spent in clang::EmitBackendOutput and of that
2.2s in llvm::legacy::PassManagerImpl::run().
Parser::ParseTopLevelDecl takes only 0.8s.
Building with -O0 instead of -O2 -g makes the compile over twice as fast.
Filing with example, so folks can check if anything surprising is going on. If
not, to the WontFix it goes.
(Times on a 2 year old MBP, with a release build of clang as of today.)
The attached file is a preprocessed version of ninja's src/build_test.cc, it
can also be built by checking out ninja and running
CXX=path/to/clang ./configure.py
ninja ninja_test
touch src/build_test.cc
ninja ninja_test -v
in the checkout.
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