[LLVMdev] Help needed on debugging llvm

Anitha Boyapati anitha.boyapati at gmail.com
Tue Nov 6 01:19:33 PST 2012

Hi Duncan

I am facing a build error about __builtin_iceil when compiled
with dragonegg using -ffast-math option. My dragonegg is built with
(I am compiling namd spec benchmark here again).

Any idea?

g++ -march=bdver2 -save-temps
-fplugin=/home/anboyapa/install/bin/dragonegg.so   -O2 -march=bdver2
-save-temps -fplugin=/home/anboyapa/install/bin/dragonegg.so -mno-fma
-mfma4 -ffast-math  -DSPEC_CPU_LP64        Compute.o ComputeList.o
ComputeNonbondedUtil.o LJTable.o Molecule.o Patch.o PatchList.o ResultSet.o
SimParameters.o erf.o spec_namd.o                     -o namd
spec_namd.o: In function `main':
spec_namd.C:(.text+0x2a3): undefined reference to `__builtin_iceil'
collect2: error: ld returned 1 exit status
specmake: *** [namd] Error 1

On 5 November 2012 14:32, Duncan Sands <baldrick at free.fr> wrote:

> Hi Anitha,
>  http://llvm.org/bugs/show_bug.**cgi?id=14185<http://llvm.org/bugs/show_bug.cgi?id=14185>
>> I am stuck on analysis. Does any one have alternate suggestions on
>> debugging
>> llvm? (Please refer to comments for the work done so far)
> try to reduce a small standalone testcase which is an LLVM IR (.ll) file.
> Ciao, Duncan.
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* Anitha*
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