I did spec2006 tests and got the following compiling errors for 64bit build:

EtherLLC_n.cc:12:17: fatal error: cmath: No such file or directoryEtherAppSrv_n.cc:12:17: fatal error: cmath: No such file or directoryEtherHost_n.cc:12:17: fatal error: cmath: No such file or directoryEtherAppCli_n.cc:12:17: fatal error: cmath: No such file or directory


compilation terminated.
compilation terminated.
compilation terminated.
EtherEncap_n.cc:12:17: fatal error: cmath: No such file or directory
compilation terminated.
In file included from omnet_include/omnetpp.h:20:0,
                 from EtherHub.cc:23:
omnet_include/defs.h:23:33: fatal error: cmath: No such file or directory

compilation terminated.
compilation terminated.
EtherHub_n.cc:12:17: fatal error: cmath: No such file or directory
compilation terminated.
In file included from omnet_include/omnetpp.h:20:0,
                 from EtherApp_m.h:8,
                 from EtherApp_m.cc:11:
omnet_include/defs.h:23:33: fatal error: cmath: No such file or directory
compilation terminated.
In file included from omnet_include/omnetpp.h:20:0,
                 from EtherFrame_m.h:8,
                 from EtherFrame_m.cc:11:
omnet_include/defs.h:23:33: fatal error: cmath: No such file or directoryIn file included from omnet_include/omnetpp.h:20:0,
                 from EtherCtrl_m.h:8,
                 from EtherCtrl_m.cc:11:
omnet_include/defs.h:23:33: fatal error: cmath: No such file or directory

compilation terminated.
compilation terminated.
EtherBus_n.cc:12:17: fatal error: cmath: No such file or directory
compilation terminated.
In file included from omnet_include/omnetpp.h:20:0,
                 from EtherLLC.cc:24:
omnet_include/defs.h:23:33: fatal error: cmath: No such file or directory
compilation terminated.
In file included from omnet_include/omnetpp.h:20:0,
                 from EtherBus.cc:27:
omnet_include/defs.h:23:33: fatal error: cmath: No such file or directory
compilation terminated.
In file included from omnet_include/omnetpp.h:20:0,
                 from EtherAppSrv.cc:21:
omnet_include/defs.h:23:33: fatal error: cmath: No such file or directory
compilation terminated.
In file included from omnet_include/omnetpp.h:20:0,
                 from EtherEncap.cc:24:
omnet_include/defs.h:23:33: fatal error: cmath: No such file or directory
compilation terminated.
EtherAppCli.cc:22:17: fatal error: cmath: No such file or directory
compilation terminated.
specmake: *** [EtherEncap_n.o] Error 1
specmake: *** Waiting for unfinished jobs....
specmake: *** [EtherAppCli_n.o] Error 1
specmake: *** [EtherCtrl_m.o] Error 1
specmake: *** [EtherHost_n.o] Error 1
specmake: *** [EtherApp_m.o] Error 1
specmake: *** [EtherBus_n.o] Error 1
specmake: *** [EtherHub.o] Error 1
specmake: *** [EtherAppSrv_n.o] Error 1
specmake: *** [EtherHub_n.o] Error 1
specmake: *** [EtherFrame_m.o] Error 1
specmake: *** [EtherLLC_n.o] Error 1
specmake: *** [EtherBus.o] Error 1
specmake: *** [EtherLLC.o] Error 1
specmake: *** [EtherEncap.o] Error 1
specmake: *** [EtherAppCli.o] Error 1
specmake: *** [EtherAppSrv.o] Error 1
Error with make 'specmake -j16 build': check file '/tmp/cpu2006/benchspec/CPU2006/471.omnetpp/build/build_base_base_64.0000/make.err'
  Command returned exit code 2
  Error with make!
*** Error building 471.omnetpp
If you wish to ignore this error, please use '-I' or ignore errors.


The cmd I did was

bin/runspec -c pat_base_64 --iterations=1 --size=ref all

and got above errors.

Appears the compiler is not looking in the correct place for C++ includes.

[root@c57f1ju0203 ~]# cat junk.cc
#include <cmath>

[root@c57f1ju0203 ~]# g++ -c junk.cc
junk.cc:1:17: fatal error: cmath: No such file or directory
compilation terminated.

If you add -v to the above command you'll see the following lines in the output:

ignoring nonexistent directory "/usr/local/lib/gcc/powerpc64-linux/4.6.2/../../../../include/c++/4.6.2"
ignoring nonexistent directory "/usr/local/lib/gcc/powerpc64-linux/4.6.2/../../../../include/c++/4.6.2/powerpc64-linux"
ignoring nonexistent directory "/usr/local/lib/gcc/powerpc64-linux/4.6.2/../../../../include/c++/4.6.2/backward"
ignoring nonexistent directory "/usr/local/lib/gcc/powerpc64-linux/4.6.2/../../../../powerpc64-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/lib/gcc/powerpc64-linux/4.6.2/include
 /usr/local/include
 /usr/local/lib/gcc/powerpc64-linux/4.6.2/include-fixed
 /usr/include
End of search list.

There is no /usr/local/include/c++/4.6.2 subdirectory, but there are the following two, which do contain 'cmath'.
/usr/include/c++/4.6.2 (although this dir contains a "ppc64-redhat-linux" subdir as opposed to "powerpc64-linux" noted above, so possibly a separate issue)
/usr/local/include/c++/4.6.1

So I did a test: by removing the codes in  /usr/local/include , then the compiling can go on. So it means it doesn't go on to search other pathes like /usr/include , etc. after it didn't find the header in /usr/local/include/. 

== Comment:  ==

An easier way to produce the failure, as opposed to trying to build SPEC is the simple example that follows.


[root@c57f1ju0203 ~]# cat junk.cc
#include <cmath>

[root@c57f1ju0203 ~]# g++ -c junk.cc
junk.cc:1:17: fatal error: cmath: No such file or directory
compilation terminated.