[LLVMbugs] [Bug 20061] New: ASTMatchersTest.cpp takes too long to compile

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20061

            Bug ID: 20061
           Summary: ASTMatchersTest.cpp takes too long to compile
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: klimek at google.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12670
  --> http://llvm.org/bugs/attachment.cgi?id=12670&action=edit
preprocessed file

We probably have to split this file or find a better way of doing this test, it
is a very noticeable serialization point in a parallel build:

$ time ~/inst/clang/bin/clang -c -std=c++11 ASTMatchersTest.ii -w
-Wno-invalid-constexpr

real    0m8.914s
user    0m8.566s
sys    0m0.309s
$ time /usr/bin/gcc -c -std=c++11 ASTMatchersTest.ii -w -Wno-invalid-constexpr

real    0m15.773s
user    0m15.017s
sys    0m0.689s
$ time ~/inst/clang/bin/clang -c -std=c++11 ASTMatchersTest.ii -w
-Wno-invalid-constexpr -O3

real    0m38.222s
user    0m37.706s
sys    0m0.360s
$ time /usr/bin/gcc -c -std=c++11 ASTMatchersTest.ii -w -Wno-invalid-constexpr
-O3

real    0m43.853s
user    0m43.004s
sys    0m0.674s

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