[LLVMbugs] [Bug 23708] New: GLEW build performance

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23708

            Bug ID: 23708
           Summary: GLEW build performance
           Product: clang
           Version: 3.6
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: d.m.bugs at web.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Building GLEW with clang takes 50x longer than building GLEW with GCC.

With clang: make  853.40s user 2.66s system 99% cpu 14:18.96 total
With gcc:   make  28.35s user 0.47s system 99% cpu 28.987 total

Steps to reproduce:

git clone https://github.com/nigels-com/glew
cd glew
make extensions
mkdir BUILD
cd BUILD
cmake -DCMAKE_CXX_COMPILER=$(which clang++) -DCMAKE_C_COMPILER=$(which clang)
-DBUILD_UTILS=OFF ../build/cmake
time make


System:
 - clang: 3.6.1
 - gcc:   5.1.0
 - OS:    Arch Linux

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