[Insight-developers] gcc compilation flag conflict when profiling with gprof

[Brad King]

On 07/28/2011 12:17 PM, Williams, Norman K wrote:
> We're tracking the HDF5 releases, so that bit of silliness is actually in
> a third party CMakeLists.txt, I think.The HDF group is very concerned with
> performance, since HDF is used on gigantic datasets, so they probably
> stuck this in, thinking it would be faster.

I think it is safe to remove -fomit-frame-pointer from ITK's distribution
of HDF5, at least optionally.  One may just commit the change like any
other in ITK.

-Brad


> We already have to turn off -fopenmp in order for HDF5 to link properly on
> OS X, so I think we should remove -pg at the same time.  You want to
> profile ITK, not HDF5, right?
> 
> On 7/25/11 3:54 PM, "gang song" <songgang97 at gmail.com> wrote:
> 
>> Hi,
>>
>> I am trying to profile ITK codes using gprof in Linux, which needs to
>> add flag -pg in gcc compilation and linking. However, -pg conflicts
>> with -fomit-frame-pointer.  Here is what I added in ccmake:
>> CMAKE_CXX_FLAGS                  -pg
>> CMAKE_C_FLAGS                    -pg
>> CMAKE_EXE_LINKER_FLAGS           -pg
>>
>>
>> [ 44%] Building C object
>> Modules/ThirdParty/HDF5/src/itkhdf5/src/CMakeFiles/H5make_libsettings.dir/
>> H5make_libsettings.c.o
>> gcc: -pg and -fomit-frame-pointer are incompatible
>> make[3]: ***
>> [Modules/ThirdParty/HDF5/src/itkhdf5/src/CMakeFiles/H5make_libsettings.dir
>> /H5make_libsettings.c.o]
>> Error 1
>> make[2]: ***
>> [Modules/ThirdParty/HDF5/src/itkhdf5/src/CMakeFiles/H5make_libsettings.dir
>> /all]
>> Error 2
>> make[1]: ***
>> [Modules/Registration/Refactoring/test/CMakeFiles/ITK-RegistrationRefactor
>> ingTestDriver.dir/rule]
>> Error 2
>> make: *** [ITK-RegistrationRefactoringTestDriver] Error 2
>>
>> -fomit-frame-pointer is used in
>> ITK/Modules/ThirdParty/HDF5/src/itkhdf5/CMakeLists.txt, line 361. ITK
>> compiles fine if removing it:
>>
>> IF (CMAKE_COMPILER_IS_GNUCC)
>> #  SET (CMAKE_C_FLAGS "${CMAKE_ANSI_CFLAGS} ${CMAKE_C_FLAGS} -std=c99
>> -fomit-frame-pointer -finline-functions -fno-common")
>> SET (CMAKE_C_FLAGS "${CMAKE_ANSI_CFLAGS} ${CMAKE_C_FLAGS} -std=c99
>> -finline-functions -fno-common")
>> ENDIF (CMAKE_COMPILER_IS_GNUCC)
>>
>>
>> Is this a good way to make "-pg" flag working?
>>
>>
>> Thanks
>>
>> -Gang
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> 
> 
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