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

[gang song]

Sorry for replying late. Yes, I want to profile ITK, not HDF5.

To keep best effort in tracking HDF5 release, I wonder if there is a
good way to script CMakeLists.txt, to find if "-pg" is turned on in
the active compiling/linking flags? It would be great if you could
point me to some references.


Thanks

-Gang


On Thu, Jul 28, 2011 at 1:09 PM, Brad King <brad.king at kitware.com> wrote:
> 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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