[LLVMbugs] [Bug 8819] New: Regression (r121857): clang doesn't terminate when trying to compile a file

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8819

           Summary: Regression (r121857): clang doesn't terminate when
                    trying to compile a file
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nicolasweber at gmx.de
                CC: llvmbugs at cs.uiuc.edu


When building chrome, clang doesn't terminate when trying to compile a file. I
bisected this, it started in  r121857.

It's somewhat hard to produce a reduced test case, because when I create a
preprocessed file with -E, it is compiled just fine:

$ time    /Users/thakis/src/llvm-rw/Release+Asserts/bin/clang++ -x c++ -arch
i386  -fmessage-length=0 -pipe -Wno-trigraphs -fno-exceptions -fno-rtti -O0
-Werror -Wnewline-eof -DCHROMIUM_BUILD -DENABLE_REMOTING=1 -DENABLE_GPU=1
-DLIBXML_STATIC -D__STDC_FORMAT_MACROS -DDYNAMIC_ANNOTATIONS_ENABLED=1 -D_DEBUG
-isysroot /Developer/SDKs/MacOSX10.5.sdk -fvisibility=hidden
-fvisibility-inlines-hidden -fno-threadsafe-statics -mmacosx-version-min=10.5
-gdwarf-2 -Wall -Wendif-labels -Wextra -Wno-unused-parameter
-Wno-missing-field-initializers -F/Users/thakis/src/chrome-git/src/clang/Debug
-F/Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/ApplicationServices.framework/Frameworks
-I/Users/thakis/src/chrome-git/src/clang/Debug/include
-I../third_party/icu/public/common -I../third_party/icu/public/i18n -I../gpu
-I.. -I/Users/thakis/src/chrome-git/src/clang/DerivedSources/Debug/chrome
-I../third_party/mesa/MesaLib/include
-I/Users/thakis/src/chrome-git/src/clang/DerivedSources/Debug/app
-I/Users/thakis/src/chrome-git/src/clang/DerivedSources/Debug/app/app_resources
-I../skia/config -I../third_party/skia/include/config
-I../third_party/skia/include/core -I../third_party/skia/include/effects
-I../skia/ext -I../third_party/bzip2 -I../third_party/libxml/mac/include
-I../third_party/libxml/src/include -I../third_party/sqlite
-I../third_party/zlib -I../third_party/npapi -I../third_party/npapi/bindings
-I/Users/thakis/src/chrome-git/src/clang/obj/chrome.build/Debug/common.build/DerivedSources/i386
-I/Users/thakis/src/chrome-git/src/clang/obj/chrome.build/Debug/common.build/DerivedSources
-c /Users/thakis/src/chrome-git/src/chrome/common/render_messages.cc -o tmp.cc
-Eclang: warning: argument unused during compilation: '-c'

real    0m0.413s
user    0m0.202s
sys    0m0.186s
dhcp-172-19-253-91:chrome thakis$ time   
/Users/thakis/src/llvm-rw/Release+Asserts/bin/clang++ -x c++ -arch i386 -c
tmp.ccreal    0m8.251suser    0m7.799ssys    0m0.437s



But if I try to compile directly, clang hangs:


dhcp-172-19-253-91:chrome thakis$ time   
/Users/thakis/src/llvm-rw/Release+Asserts/bin/clang++ -x c++ -arch i386
-fmessage-length=0 -pipe -Wno-trigraphs -fno-exceptions -fno-rtti -O0 -Werror
-Wnewline-eof -DCHROMIUM_BUILD -DENABLE_REMOTING=1 -DENABLE_GPU=1
-DLIBXML_STATIC -D__STDC_FORMAT_MACROS -DDYNAMIC_ANNOTATIONS_ENABLED=1 -D_DEBUG
-isysroot /Developer/SDKs/MacOSX10.5.sdk -fvisibility=hidden
-fvisibility-inlines-hidden -fno-threadsafe-statics -mmacosx-version-min=10.5
-gdwarf-2 -Wall -Wendif-labels -Wextra -Wno-unused-parameter
-Wno-missing-field-initializers -F/Users/thakis/src/chrome-git/src/clang/Debug
-F/Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/ApplicationServices.framework/Frameworks
-I/Users/thakis/src/chrome-git/src/clang/Debug/include
-I../third_party/icu/public/common -I../third_party/icu/public/i18n -I../gpu
-I.. -I/Users/thakis/src/chrome-git/src/clang/DerivedSources/Debug/chrome
-I../third_party/mesa/MesaLib/include
-I/Users/thakis/src/chrome-git/src/clang/DerivedSources/Debug/app
-I/Users/thakis/src/chrome-git/src/clang/DerivedSources/Debug/app/app_resources
-I../skia/config -I../third_party/skia/include/config
-I../third_party/skia/include/core -I../third_party/skia/include/effects
-I../skia/ext -I../third_party/bzip2 -I../third_party/libxml/mac/include
-I../third_party/libxml/src/include -I../third_party/sqlite
-I../third_party/zlib -I../third_party/npapi -I../third_party/npapi/bindings
-I/Users/thakis/src/chrome-git/src/clang/obj/chrome.build/Debug/common.build/DerivedSources/i386
-I/Users/thakis/src/chrome-git/src/clang/obj/chrome.build/Debug/common.build/DerivedSources
-c /Users/thakis/src/chrome-git/src/chrome/common/render_messages.cc -o tmp.cc 
^C

real    2m42.244s
user    0m0.004s
sys    0m0.010s

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