[LLVMdev] strict aliasing and LLVM

[Xinliang David Li]

2010/10/27 Rafael Espíndola <rafael.espindola at gmail.com>

> 2010/10/27 Xinliang David Li <xinliangli at gmail.com>:
> > Thanks. Just built clang and saw the meta data and annotations on the
> memory
> > accesses --  is any opt pass consuming the information?
>
> The tests in test/Analysis/TypeBasedAliasAnalysis suggest that at
> least licm is using it. Also note that
> lib/Analysis/TypeBasedAliasAnalysis.cpp defines as enable-tbaa option
> that is off by default.
>
>
I tried the option -- no much differences in the generated code.

A related question: how to pass the llvm specific options from clang driver?
 It supports -Wl, -Wa, -Xanalyzer etc, but there is no documentation on how
to pass -enable-tbaa to opt driver.

llvmc supports -Wo, option, but the option specified after -Wo, seems to be
dropped.  Another thing, when using -clang option to llvmc, I got link
errors even when -c or -S is specified:


clang -x c  foo.c -emit-llvm-bc -o /tmp/llvm_JnS1o8/foo.bc

(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
clang: error: linker (via gcc) command failed with exit code 1 (use -v to
see invocation)

David



> > By the way the build instruction in this
> > page http://clang.llvm.org/get_started.html needs to be updated -- it
> > recommends config (with default settings) and build llvm in the source
> dir
> > -- it leaves some 'sticky' generated files in the source dir leading to
> > building problems.
>
> Thanks. Will try to improve it a bit.
>
> >
> > David
> > 2010/10/27 Rafael Espíndola <rafael.espindola at gmail.com>
>
> Cheers,
> Rafael
>
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