[LLVMbugs] [Bug 8679] New: -O1 compilation uses all memory and fails on 32- and 64-bit Ubuntu 10.10 installs

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8679

           Summary: -O1 compilation uses all memory and fails on 32- and
                    64-bit Ubuntu 10.10 installs
           Product: clang
           Version: 2.8
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: bugzilla at lklundin.dk
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=5825)
 --> (http://llvm.org/bugs/attachment.cgi?id=5825)
GPLed C99 code after clang -E, fails with -O1

clang -c -o /dev/null naco_img_jitter_cpp.c

succeeds in about 0.3s. However,

clang -c -o /dev/null naco_img_jitter_cpp.c -O1

will run and allocate memory via brk() and later also mmap()
until mmap() returns ENOMEM and the compilation fails.

The problem also occurs with -O2.

The system runs 64-bit Ubuntu 10.10 with

$ clang --version
clang version 2.8 (branches/release_28)
Target: x86_64-pc-linux-gnu
Thread model: posix

The problem is also present on a 32-bit Ubuntu 10.10 with

$ clang --version
clang version 2.8 (branches/release_28)
Target: i386-pc-linux-gnu
Thread model: posix

The attached source code example has been generated with clang -E from GPL C99
source code that compiles and runs as expected with various versions of gcc.

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