[LLVMbugs] [Bug 14360] New: Clang with -fprofile-arcs uses lots of memory

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Nov 16 07:10:43 PST 2012


             Bug #: 14360
           Summary: Clang with -fprofile-arcs uses lots of memory
           Product: clang
           Version: 3.1
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: mathias.demare at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 9554
  --> http://llvm.org/bugs/attachment.cgi?id=9554
Test case resulting in the memory issue

I noticed a memory issue when compiling our code base using Clang. The machine
running the build goes down due to excessive memory usage (with 2 GB free
memory before starting the build).

I've narrowed it down to the attached test case (it uses Google Test).

The error occurs when compiling with the following arguments:
clang -fprofile-arcs -I../gtest/include -c test.cpp -o test.o

Adding one pair of asserts adds 3 MB to the memory usage of Clang:

This is on an 64-bit Linux (Ubuntu 12.04):
clang version 3.1 (tags/RELEASE_31/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix

Compiling the same test case using gcc with the same arguments: 800 MB RAM.
Compiling the same test case using gcc with '-fprofile-arcs' removed: 600 MB
Compiling the same test case using clang with '-fprofile-arcs' removed: 300 MB

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