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

[Williams, Norman K]

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.


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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