[cfe-dev] clang/llvm issue with compiling gcc

[Anna Zaks]

Hi John,

Try replacing "-analyze" with "-E" and "-o /tmp/gcc/2011-09-15-1" with "-o c-common.i" in the command below. That should produce the pre-processed file called c-common.i in the current directory. You can double check that it's good by running: 
    $ clang --analyze c-common.i
,which should reproduce the problem.

Thanks for tracking this down,
Anna.
On Sep 15, 2011, at 9:27 AM, John Smith wrote:

> Hi,
> 
> 
> Ok, so I ran scan-build with -v -v options, and got a whole lot of
> output. I ran 'scan-build -v -v -o /tmp/gcc make' so i didnt specify a
> parallel build. According to the screen output, it seems to freeze
> while analyzing 'ANALYZE: ../.././gcc/c-common.c c_define_builtins'.
> 
> I can reproduce the hang by running the exact same command line myself :
> 
> /usr/local/bin/clang -cc1 -triple i386-pc-linux-gnu -analyze
> -disable-free -main-file-name c-common.c -analyzer-store=region
> -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume
> -analyzer-checker=core -analyzer-checker=deadcode
> -analyzer-checker=security -analyzer-checker=unix -analyzer-output
> plist -w -mrelocation-model static -mdisable-fp-elim -masm-verbose
> -mconstructor-aliases -target-cpu pentium4 -target-linker-version
> 2.20.51.0.7 -momit-leaf-frame-pointer -resource-dir
> /usr/local/bin/../lib/clang/3.0 -D IN_GCC -D HAVE_CONFIG_H -I . -I .
> -I ../.././gcc -I ../.././gcc/. -I ../.././gcc/../include -I
> ../.././gcc/../libcpp/include -I ../.././gcc/../libdecnumber -I
> ../.././gcc/../libdecnumber/bid -I ../libdecnumber -Wno-long-long
> -Wno-variadic-macros -Wno-overlength-strings -ferror-limit 19
> -fmessage-length 0 -fdiagnostics-show-option
> -analyzer-display-progress -analyzer-output=html -o
> /tmp/gcc/2011-09-15-1 -x c ../.././gcc/c-common.c
> 
> Now where do I find this 'pre-processed' file I need to submit the bug report ?
> 
> 
> Regards,
> 
> 
> John Smith.
> 
> 
> 
> 
> On Tue, Sep 13, 2011 at 9:33 PM, Ted Kremenek <kremenek at apple.com> wrote:
>> Hi John,
>> 
>> It sounds like the analyzer is hanging on one of your files.
>> 
>> Could suggestions for debugging:
>> 
>> 1) Don't perform a parallel build.
>> 
>> 2) Run scan-build with two extra -v -v options, which will show a very verbose log of information, including how clang is getting invoked for static analysis.
>> 
>> Once you find the file that it is hanging on, please file a bug report with a preprocessed file that can be used to reproduce the issue.
>> 
>> Cheers,
>> Ted
>> 
>> On Sep 13, 2011, at 12:25 PM, John Smith wrote:
>> 
>>> Hi,
>>> 
>>> 
>>> Im trying to run scan-build on GCC 4.5.3, and im running into the
>>> following problem: Somewhere during the compilation, the process seems
>>> to stall/freeze/hang/loop... whatever it's doing, it's not progressing
>>> anymore.
>>> 
>>> Im running into this issue using clang version 3.0 trunk 139148. I
>>> didnt run into this problem when compiling the same version of gcc on
>>> the same system when using either gcc (4.5.1), or an earlier version
>>> of clang: v3.0 trunk rev. 131083 (or slightly earlier, dont have the
>>> exact version). I didnt run into this issue when I ran with the same
>>> version of scan-build on other c programs (yet ?) on the same system.
>>> It doesnt seem to be a disk/cpu/ram shortage issue.
>>> 
>>> According to 'top', 'clang' is eating up most of my cpu, but when
>>> running strace on the pid, I get no output whatsoever. When running
>>> strace on the 7 PID's running 'ccc-analyzer', most seem to be in
>>> either 'wait' or 'waitpid'. Except for the ccc-analyzer that produced
>>> the last output on my screen, wich seems to be stuck in 'read'. The 2
>>> PID's of 'make' seem to be in wait and waitpid as well.
>>> 
>>> I have no idea on how to start with problemshooting here. Any help is welcome.
>>> 
>>> 
>>> Thanks in advance,
>>> 
>>> 
>>> Regards,
>>> 
>>> 
>>> John Smith.
>>> _______________________________________________
>>> cfe-dev mailing list
>>> cfe-dev at cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>> 
>> 
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