[mpich-discuss] Compiler optimization flags in MPICH 3.0 rc1

[Darius Buntinas]

There are certain warnings that the compiler will only check with optimization enabled.  To get all warnings, -O2 must be included.

-d


On Nov 16, 2012, at 11:52 AM, Yauheni Zelenko wrote:

> Hi, Darius!
> 
> But why warnings flags are mixed with optimization ones? I think these options should be independent.
> 
> Eugene.
> ________________________________________
> From: discuss-bounces at mpich.org [discuss-bounces at mpich.org] On Behalf Of Darius Buntinas [buntinas at mcs.anl.gov]
> Sent: Friday, November 16, 2012 9:41 AM
> To: discuss at mpich.org
> Cc: mpich-discuss at mcs.anl.gov
> Subject: Re: [mpich-discuss] Compiler optimization flags in MPICH 3.0 rc1
> 
> The --enable-strict flag adds -O2.  Try --enable-strict=noopt.
> 
> -d
> 
> 
> On Nov 15, 2012, at 7:06 PM, Yauheni Zelenko wrote:
> 
>> Hi!
>> 
>> I tried to build optimize and debug version of MPICH 3.0 rc1 and noticed some problems with compiler optimization flags. Looks like -O2 is set implicitly.
>> 
>> For optimize configuration command like contains -O2 and -O3:
>> 
>> ./configure --prefix=${InstallDir}                                              \
>>       --with-pm=hydra --with-device=ch3:nemesis                               \
>>       --disable-chekpointing                                                  \
>>       --enable-strict --enable-fast=O3                                        \
>>       --disable-f77 --disable-fc                                              \
>>       CC=${GCCDir}/bin/gcc CFLAGS="-m32 -fPIC"                                \
>>       CPP=${GCCDir}/bin/cpp                                                   \
>>       CXX=${GCCDir}/bin/g++ CXXFLAGS="-m32 -fPIC"                             \
>>       CXXCPP=${GCCDir}/bin/cpp
>> 
>> For debug one -O2, but optimization is disabled:
>> 
>> ./configure --prefix=${InstallDir}                                              \
>>       --with-pm=hydra --with-device=ch3:nemesis                               \
>>       --disable-chekpointing                                                  \
>>       --enable-strict --disable-fast -enable-g=debug                          \
>>       --disable-f77 --disable-fc                                              \
>>       CC=${GCCDir}/bin/gcc CFLAGS="-m32 -fPIC"                                \
>>       CPP=${GCCDir}/bin/cpp                                                   \
>>       CXX=${GCCDir}/bin/g++ CXXFLAGS="-m32 -fPIC"                             \
>>       CXXCPP=${GCCDir}/bin/cpp
>> 
>> Eugene.
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